US20030192200A1 - Athletic shoe with stabilized discreet resilient elements in the heel thereof - Google Patents
Athletic shoe with stabilized discreet resilient elements in the heel thereof Download PDFInfo
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- US20030192200A1 US20030192200A1 US10/410,952 US41095203A US2003192200A1 US 20030192200 A1 US20030192200 A1 US 20030192200A1 US 41095203 A US41095203 A US 41095203A US 2003192200 A1 US2003192200 A1 US 2003192200A1
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- Prior art keywords
- resilient
- shoe
- cavities
- spring
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B5/00—Footwear for sporting purposes
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/18—Resilient soles
- A43B13/181—Resiliency achieved by the structure of the sole
- A43B13/182—Helicoidal springs
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B21/00—Heels; Top-pieces or top-lifts
- A43B21/24—Heels; Top-pieces or top-lifts characterised by the constructive form
- A43B21/30—Heels with metal springs
Definitions
- the instant invention relates to athletic shoes having resilient springs, or spring equivalents, within the heel thereof.
- the instant invention comprises an improvement of my U.S. Pat. No. 5,544,431 (1996) entitled Shock Absorbing Shoe with Adjustable Insert and also comprises an improvement over the invention of U.S. Pat. No. 5,343,639 (1994) to Kilgore, et al, entitled Shoe with Improved Midsole and over U.S. Pat. No. 6,006,449 (1999) to Orlowski, et al entitled Footwear Having Spring Assemblies In the Insoles Thereof.
- U.S. Pat. No. 5,282,325 discloses a sport shoe having a spring disposed in the sole of the shoe in which the spring operates to provide bias to the foot in a raised position and cushioning of the shoe against shock from the ground.
- the spring employed therein is a torsion spring positional along the longitudinal axis disposed horizontal to the ground and using the spring constant to resist flexing of the spring.
- the above referenced U.S. patent to Kilgore provides an improved midsole and heel utilizes a group of hollow cylindrical columns within the heel portion and, therein, the use of either gas bladders of a micro-cellular foam-like material therein to provide a desired degree of stiffness to the respective columns responsive to impact thereupon. Given the essentially passive nature of the air bladder or micro cellular supported columns of said system, the end result is a shoe having improved cushioning but, however, lacking the requisite degree of resilient spring-action for use in certain sports such as basketball.
- My invention relates to an athletic shoe having a substantially horizontal chamber substantially within a heel portion of a midsole thereof, said chamber having atmospheric communication at lateral sides thereof, the chamber comprising an upper substantially rigid horizontal support plate having a plurality of transverse downwardly directed resilient cavities therein, each of said cavities defined by an upper resilient sleeve; a lower substantially rigid horizontal support plate having a corresponding plurality of upwardly directed resilient cavities therein, each of said cavities defined in part by a lower resilient sleeve; and resilient means in said chamber, each comprising a vertical length greater than an aggregate vertical length of walls of each said upper and lower cavities, when said resilient means are uncompressed, said resilient means each having a greater spring constant and spring rate than said walls of said cavities.
- FIG. 1 is a perspective breakaway schematic view of a first embodiment of the invention showing the inventive midsole chamber of the athletic shoe, showing the use of spring elements.
- FIG. 2 is a horizontal cross-sectional view taken through Line 2 - 2 of FIG. 1.
- FIG. 3 is a vertical cross-sectional view taken through Line 3 - 3 of FIG. 1.
- FIG. 3A is an alternative embodiment of the view of FIG. 3.
- FIG. 4 is a breakaway schematic view of a second embodiment of the instant invention, using a solid resilient element in lieu of spring elements.
- FIG. 5 is a vertical cross-sectional view taken along Line 5 - 5 of FIG. 4.
- FIG. 6 is a horizontal cross-sectional view taken through Line 6 - 6 of FIG. 4.
- FIGS. 7 and 8 are respective vertical and horizontal cross-sectional views of a variation of the embodiment of FIGS. 4 to 6 in which a hollow resilient element is substituted for a solid resilient element.
- FIG. 9 is a breakaway schematic view of a further embodiment of the invention, generally similar to the embodiment of FIGS. 4 to 6 in which each of the resilient internal rubber elements thereof extends through the lower platform and to the external outersole of the shoe.
- FIG. 10 is a rear breakaway view of the embodiment of FIG. 9.
- FIG. 11 is a breakaway schematic view of a further embodiment in which resilient elements are used within spring elements internally to the resilient vertical columns of the system.
- FIG. 12 is a vertical cross-sectional view taken along Line 12 - 12 of FIG. 11.
- FIG. 13 is a horizontal cross-sectional view taken along Line 13 - 13 of FIG. 11.
- the inventive athletic shoe may be seen to include an upper portion 10 forming a covering for insertion of a foot and a lower portion, typically referred to as a sole 12 , secured to said upper portion for support of the base of the foot.
- Sole 12 comprises an upper sole 34 , a midsole 30 , and a lower sole 36 .
- Securement of upper portion 10 to upper sole 34 occurs along an interface 14 .
- a substantially horizontal chamber 16 having atmospheric communication at the lateral sides thereof.
- a horizontal chamber of this type is one having a greater ratio of height-to-length is taught in my above referenced U.S. Pat. No. 5,544,431.
- Said horizontal chamber 16 exhibits a ratio of longitudinal length to vertical height of approximately 4 to 1.
- an upper substantially rigid horizontal support plate 18 having therein a plurality of transverse downwardly directed cavities 20 .
- Said cavities are defined by a corresponding plurality of upper resilient sleeves 22 . See FIG. 8.
- a lower substantially rigid horizontal plate 24 having a plurality of transverse upwardly directed cavities 26 therein, which are defined by respective lower resilient sleeves 27 .
- said upper and lower sleeves 22 and 27 respectively are more flexible than resilient means 28 that are disposed within an aggregate of upper and lower cavities 20 and 26 .
- Said upper and lower sleeves may assume the form of a single continuous sleeve 25 as is shown in FIGS. 1, 3 and 5 .
- the material of which said sleeves are formed is more rigid than that of the spring means disposed within said cavities the upper and lower cavity defining sleeves will be discreet from each other, as is shown in the embodiment of FIG. 3A, further described below.
- vertical sleeves 22 / 27 will be molded integrally with upper and lower rigid horizontal supports 16 and 24 respectively, such that the joinder of the sleeves 22 and 27 thereof will occur after resilient means 28 has been dropped into apertures 31 within upper rigid horizontal support plate 16 prior to adhesion or other securement of sole 12 to upper shoe portion 10 or, conversely, after said means have been dropped into apertures 32 within lower rigid plate 24 . Thereafter, such apertures must be sealed It is, thereby, to be appreciated that any of a number of production techniques may be employed in order to secure resilient within its respective resilient sleeve 22 / 27 . It is however anticipated that, in most production scenarios, insertion of said through the lower plate 24 will be a more practical strategy.
- FIG. 2 In the horizontal cross-sectional view of FIG. 2 is shown lower support plate 24 , integrated resilient sleeves 22 and 27 , and resilient means 28 located within cavities 20 .
- FIG. 3 In the transverse vertical cross-sectional view of FIG. 3 are shown upper and lower support plates 18 and 24 respectively, said cavities 20 , and the transverse horizontal chamber 16 defined by said upper and lower plates 18 and 24 .
- the midsole 30 may also be seen in FIG. 3.
- said resilient means comprises a metallic spring.
- means 28 will compress responsive to downward forces originating from upper portion 10 , that is, the heel of the foot of a user.
- upper and lower sleeves 122 and 127 are more delineated in that, in this embodiment, said sleeves are formed of a material which is more rigid than that of spring 28 . Accordingly, a gap 132 must be provided between said upper and lower sleeves to permit compression of spring 28 within the vertical cavities 20 .
- resilient means are expressed as cylinders of rubber 228 , or a hard but resilient polymer, having a resiliency comparable to that of a spring of FIGS. 1 - 3 .
- rubber springs in combination with upper and lower plates 18 and 24 respectively afford excellent stability to the foot, particularly when used with cavity-defining sleeves 225 .
- the term “rubber spring” is defined as any element having a spring constant and spring rate greater than that of cavity defining sleeves 27 or 225 . It is thereby to be appreciated that said sleeves 225 and the cavities 220 formed thereby thus serve to “lock” the spring means, whether they comprise metallic springs or “rubber springs,” in place relative to upper and lower plates 18 and 24 .
- the spring cushioning effect of the present system insulates the sole of the foot from shock otherwise transmitted through the sole components 34 , 30 , and 36 of the shoe itself, acting in much the fashion of a shock absorber in a vehicle. Resultingly, when walking or running with a shoe of the present type, energy impacting upon the lower sole 36 from the pavement will be transmitted upwardly through spring means 18 or 228 thereby providing an incremental uplift to one's walking, running or other activity. It has been further found that impact upon many parts of the body inclusive of the feet, knees, hips and spine are diminished through the shock absorbing effect of the internal spring or rubber cylinder assembly.
- FIGS. 7 and 8 are shown a variation of the embodiment of FIGS. 4 to 6 in which the radial cross-section of each rubber or polymeric cylinder 229 defines a hollow sleeve having an annular geometry within each sleeve 225 .
- the function of the cylinder as a spring is more clearly replicated, this subject to a sufficient radial annulus, and choice of material, of the cylinder 229 , in which its spring constant and spring rate exceed that of sleeve 225 .
- FIGS. 9 and 10 are shown a variation of the embodiment of FIGS. 4 thru 6 wherein there are provided rubber cylinders 328 which extend through apertures 320 within lower plate 324 , this as may be more fully seen in the rear breakaway view of FIG. 10.
- rubber cylinders 328 which extend through apertures 320 within lower plate 324 , this as may be more fully seen in the rear breakaway view of FIG. 10.
- elongate rubber cylinder 328 impact directly upon the floor or pavement but are still stabilized by the action of upper and lower plates 318 and 324 respectively.
- rubber springs 328 are stabilized relative to the upper and lower plates by vertical sleeves 325 .
- resilient cylinders 428 may be placed within metallic spring 429 and within integral sleeves 425 .
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
An athletic shoe having a substantially horizontal chamber substantially within a heel portion of a midsole, having atmospheric communication at its lateral sides, includes a chamber having an upper substantially rigid horizontal support plate having several transverse downwardly directed resilient cavities, each of the cavities defined by an upper resilient sleeve. The chamber also includes a lower substantially rigid horizontal support plate having corresponding upwardly directed resilient cavities, each of the cavities defined by a lower resilient sleeve; and includes resilient elements having a vertical length greater than an aggregate vertical length of walls of each pair of the upper and lower cavities when the resilient elements are uncompressed, the resilient elements each having a greater spring constant and spring rate than the walls of the cavities.
Description
- The case is a continuation of application Ser. No. 09/882,331, filed Jun. 18, 2001, now pending.
- 1. Area of Invention
- The instant invention relates to athletic shoes having resilient springs, or spring equivalents, within the heel thereof.
- 2. Prior Art
- The instant invention comprises an improvement of my U.S. Pat. No. 5,544,431 (1996) entitled Shock Absorbing Shoe with Adjustable Insert and also comprises an improvement over the invention of U.S. Pat. No. 5,343,639 (1994) to Kilgore, et al, entitled Shoe with Improved Midsole and over U.S. Pat. No. 6,006,449 (1999) to Orlowski, et al entitled Footwear Having Spring Assemblies In the Insoles Thereof.
- Numerous patents exist in the field of footwear. Therein, a primary purpose thereof is to protect the foot from injury. Further, the sole of the shoe provides traction and cushioning. In the context of an athletic shoe, various attempts have been made in the prior art to incorporate a spring, a spring module, or spring equivalent into either or both the heel or forefoot thereof. However, spring based athletic shoes of the past were mainly novelty products having an unpredictable platform that would react unpredictably to various forces provided, this in direct relation to the impact applied by the heel of the foot to the spring, spring module or spring equivalent. Accordingly, a primary problem in the incorporation of springs into the heel of a shoe has been that of controllability thereof.
- U.S. Pat. No. 5,282,325 discloses a sport shoe having a spring disposed in the sole of the shoe in which the spring operates to provide bias to the foot in a raised position and cushioning of the shoe against shock from the ground. The spring employed therein is a torsion spring positional along the longitudinal axis disposed horizontal to the ground and using the spring constant to resist flexing of the spring. The above referenced U.S. patent to Kilgore provides an improved midsole and heel utilizes a group of hollow cylindrical columns within the heel portion and, therein, the use of either gas bladders of a micro-cellular foam-like material therein to provide a desired degree of stiffness to the respective columns responsive to impact thereupon. Given the essentially passive nature of the air bladder or micro cellular supported columns of said system, the end result is a shoe having improved cushioning but, however, lacking the requisite degree of resilient spring-action for use in certain sports such as basketball.
- In my said U.S. Pat. No. 5,544,431 (1996) is described a shock absorbing adjustable insert for use within the heel of the sole which comprises a spring module system having particular value in certain activities such as basketball and other jumping sports. Therein, the spring action operates as a shock absorber for the foot and provides an accelerating spring action following the compression which precedes any jumping motion of an athlete. Additionally, the instant invention reflects a recognition that, given the existence of contemporary high impact, high resilient polymeric materials, a considerable range of spring equivalence exists which, in terms of both spring constant and spring rate, can behave in a comparable yet more controllable fashion than classical springs.
- My invention relates to an athletic shoe having a substantially horizontal chamber substantially within a heel portion of a midsole thereof, said chamber having atmospheric communication at lateral sides thereof, the chamber comprising an upper substantially rigid horizontal support plate having a plurality of transverse downwardly directed resilient cavities therein, each of said cavities defined by an upper resilient sleeve; a lower substantially rigid horizontal support plate having a corresponding plurality of upwardly directed resilient cavities therein, each of said cavities defined in part by a lower resilient sleeve; and resilient means in said chamber, each comprising a vertical length greater than an aggregate vertical length of walls of each said upper and lower cavities, when said resilient means are uncompressed, said resilient means each having a greater spring constant and spring rate than said walls of said cavities.
- It is accordingly a primary object of the present invention to provide an athletic shoe adapted to relieve shock loads experienced by the wearer and to maximize the spring effect of the heel thereof.
- It is another object to provide an improved athletic shoe using spring elements or spring element equivalents having improved stability relative to shoe components above and below such elements.
- It is a further object of the invention to provide an athletic shoe particularly adapted for use in basketball and other jumping sports.
- The above and yet other objects and advantages of the present invention will become apparent from the hereinafter set forth Brief Description of the Drawings, Detailed Description of the Invention, and claims appended herewith.
- FIG. 1 is a perspective breakaway schematic view of a first embodiment of the invention showing the inventive midsole chamber of the athletic shoe, showing the use of spring elements.
- FIG. 2 is a horizontal cross-sectional view taken through Line2-2 of FIG. 1.
- FIG. 3 is a vertical cross-sectional view taken through Line3-3 of FIG. 1.
- FIG. 3A is an alternative embodiment of the view of FIG. 3.
- FIG. 4 is a breakaway schematic view of a second embodiment of the instant invention, using a solid resilient element in lieu of spring elements.
- FIG. 5 is a vertical cross-sectional view taken along Line5-5 of FIG. 4.
- FIG. 6 is a horizontal cross-sectional view taken through Line6-6 of FIG. 4.
- FIGS. 7 and 8 are respective vertical and horizontal cross-sectional views of a variation of the embodiment of FIGS.4 to 6 in which a hollow resilient element is substituted for a solid resilient element.
- FIG. 9 is a breakaway schematic view of a further embodiment of the invention, generally similar to the embodiment of FIGS.4 to 6 in which each of the resilient internal rubber elements thereof extends through the lower platform and to the external outersole of the shoe.
- FIG. 10 is a rear breakaway view of the embodiment of FIG. 9.
- FIG. 11 is a breakaway schematic view of a further embodiment in which resilient elements are used within spring elements internally to the resilient vertical columns of the system.
- FIG. 12 is a vertical cross-sectional view taken along Line12-12 of FIG. 11.
- FIG. 13 is a horizontal cross-sectional view taken along Line13-13 of FIG. 11.
- With reference to the perspective breakaway view of FIG. 1, the inventive athletic shoe may be seen to include an
upper portion 10 forming a covering for insertion of a foot and a lower portion, typically referred to as a sole 12, secured to said upper portion for support of the base of the foot. Sole 12 comprises anupper sole 34, amidsole 30, and alower sole 36. Securement ofupper portion 10 to upper sole 34 occurs along aninterface 14. Below this interface and within themidsole 30 is formed a substantiallyhorizontal chamber 16 having atmospheric communication at the lateral sides thereof. A horizontal chamber of this type, however, is one having a greater ratio of height-to-length is taught in my above referenced U.S. Pat. No. 5,544,431. Saidhorizontal chamber 16, exhibits a ratio of longitudinal length to vertical height of approximately 4 to 1. Therein is disposed an upper substantially rigidhorizontal support plate 18 having therein a plurality of transverse downwardly directedcavities 20. Said cavities are defined by a corresponding plurality of upper resilient sleeves 22. See FIG. 8. - Further provided is a lower substantially rigid
horizontal plate 24 having a plurality of transverse upwardly directedcavities 26 therein, which are defined by respective lowerresilient sleeves 27. Where said upper andlower sleeves 22 and 27 respectively are more flexible thanresilient means 28 that are disposed within an aggregate of upper andlower cavities - It is to be understood that in a preferred embodiment, vertical sleeves22/27 will be molded integrally with upper and lower rigid
horizontal supports sleeves 22 and 27 thereof will occur after resilient means 28 has been dropped intoapertures 31 within upper rigidhorizontal support plate 16 prior to adhesion or other securement of sole 12 toupper shoe portion 10 or, conversely, after said means have been dropped intoapertures 32 within lowerrigid plate 24. Thereafter, such apertures must be sealed It is, thereby, to be appreciated that any of a number of production techniques may be employed in order to secure resilient within its respective resilient sleeve 22/27. It is however anticipated that, in most production scenarios, insertion of said through thelower plate 24 will be a more practical strategy. - In the horizontal cross-sectional view of FIG. 2 is shown
lower support plate 24, integratedresilient sleeves 22 and 27, andresilient means 28 located withincavities 20. In the transverse vertical cross-sectional view of FIG. 3 are shown upper andlower support plates cavities 20, and the transversehorizontal chamber 16 defined by said upper andlower plates midsole 30 may also be seen in FIG. 3. In the embodiment of FIGS. 1-3, said resilient means comprises a metallic spring. - It is thereby to be appreciated that means28 will compress responsive to downward forces originating from
upper portion 10, that is, the heel of the foot of a user. In the embodiment of FIG. 3A, upper andlower sleeves spring 28. Accordingly, agap 132 must be provided between said upper and lower sleeves to permit compression ofspring 28 within thevertical cavities 20. - In the embodiment of FIG. 4, resilient means are expressed as cylinders of
rubber 228, or a hard but resilient polymer, having a resiliency comparable to that of a spring of FIGS. 1-3. Further, it has been found that such “rubber springs” in combination with upper andlower plates sleeves 225. The term “rubber spring” is defined as any element having a spring constant and spring rate greater than that ofcavity defining sleeves sleeves 225 and thecavities 220 formed thereby thus serve to “lock” the spring means, whether they comprise metallic springs or “rubber springs,” in place relative to upper andlower plates lower support plates midsole 30, lower sole 36, andheel portion 12 of the shoe. It has thereby been found that the use ofplates - It has also been found that the spring cushioning effect of the present system insulates the sole of the foot from shock otherwise transmitted through the
sole components - It has been additionally determined that the
horizontal chamber 16 created by thehorizontal plates - In the cross-sectional views taken along Lines5-5 and 6-6 of FIG. 4 may be appreciated the geometry between the respective plates after the
rubber cylinders 228 have been inserted. - In FIGS. 7 and 8 are shown a variation of the embodiment of FIGS.4 to 6 in which the radial cross-section of each rubber or
polymeric cylinder 229 defines a hollow sleeve having an annular geometry within eachsleeve 225. Thereby, the function of the cylinder as a spring is more clearly replicated, this subject to a sufficient radial annulus, and choice of material, of thecylinder 229, in which its spring constant and spring rate exceed that ofsleeve 225. - In the embodiment of FIGS. 9 and 10 is shown a variation of the embodiment of FIGS.4 thru 6 wherein there are provided
rubber cylinders 328 which extend throughapertures 320 withinlower plate 324, this as may be more fully seen in the rear breakaway view of FIG. 10. In this embodiment,elongate rubber cylinder 328 impact directly upon the floor or pavement but are still stabilized by the action of upper andlower plates vertical sleeves 325. - As may be noted in FIGS.11-13,
resilient cylinders 428 may be placed withinmetallic spring 429 and withinintegral sleeves 425. - While there has been shown and described the preferred embodiment of the instant invention it is to be appreciated that the invention may be embodied otherwise than is herein specifically shown and described and that, within said embodiment, certain changes may be made in the form and arrangement of the parts without departing from the underlying ideas or principles of this invention as set forth in the claims appended herewith.
Claims (10)
1. An athletic shoe having a substantially horizontal chamber substantially within a heel portion of a midsole thereof, said chamber having atmospheric communication at lateral sides thereof, the chamber comprising:
(a) an upper substantially rigid horizontal support plate having a plurality of transverse downwardly directed resilient cavities therein, each of said cavities defined in part by upper resilient sleeves;
(b) a lower substantially rigid horizontal support plate having a corresponding plurality of upwardly directed resilient cavities therein, each of said cavities defined in part by lower resilient sleeves; and
(c) for each vertical pair of cavities, resilient means comprising a vertical length greater than an aggregate vertical length of walls of each of said upper and lower cavities, when said resilient means are uncompressed, said resilient means each having a greater spring constant and spring rate than said walls of said cavities.
2. The shoe as recited in claim 1 in which each of said vertical cavities are defined by a single circumferential resilient sleeve comprising an integration of said upper and lower sleeves.
3. The shoe as recited in claim 2 , in which said resilient means comprises metallic spiral springs.
4. The shoe as recited in claim 3 , in which said resilient means comprise a metallic spiral springs.
5. The shoe as recited in claim 1 , in which said spring means comprises a cylindrical body of a solid resilient material.
6. The shoe as recited in claim 2 , in which said spring means comprises a cylindrical body of a solid resilient material.
7. The shoe as recited as in claim 6 , in which said cylindrical body of resilient material extends downwardly through said lower plate to a bottommost surface of said lower sole of said shoe.
8. The shoe as recited in claim 7 , in which said resilient means comprises a solid cylindrical body disposed within a metallic spiral spring.
9. The shoe as recited in claim 1 , in which said resilient means comprises a solid cylindrical body disposed within a metallic spiral spring.
10. The shoe as recited in claim 5 , in which said cylindrical body comprises a hollow annular cross-section.
Priority Applications (1)
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US10/410,952 US20030192200A1 (en) | 2001-06-18 | 2003-04-10 | Athletic shoe with stabilized discreet resilient elements in the heel thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US09/882,331 US6546648B2 (en) | 2001-06-18 | 2001-06-18 | Athletic shoe with stabilized discrete resilient elements in heel |
US10/410,952 US20030192200A1 (en) | 2001-06-18 | 2003-04-10 | Athletic shoe with stabilized discreet resilient elements in the heel thereof |
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US09/882,331 Continuation US6546648B2 (en) | 2001-06-18 | 2001-06-18 | Athletic shoe with stabilized discrete resilient elements in heel |
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US20030192200A1 true US20030192200A1 (en) | 2003-10-16 |
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US09/882,331 Expired - Lifetime US6546648B2 (en) | 2001-06-18 | 2001-06-18 | Athletic shoe with stabilized discrete resilient elements in heel |
US10/410,952 Abandoned US20030192200A1 (en) | 2001-06-18 | 2003-04-10 | Athletic shoe with stabilized discreet resilient elements in the heel thereof |
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US09/882,331 Expired - Lifetime US6546648B2 (en) | 2001-06-18 | 2001-06-18 | Athletic shoe with stabilized discrete resilient elements in heel |
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US20020189134A1 (en) | 2002-12-19 |
US6546648B2 (en) | 2003-04-15 |
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Legal Events
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