US3804322A - Plastic bag having arcuate closed end and arcuate lipped open end - Google Patents

Plastic bag having arcuate closed end and arcuate lipped open end Download PDF

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Publication number
US3804322A
US3804322A US00162376A US16237671A US3804322A US 3804322 A US3804322 A US 3804322A US 00162376 A US00162376 A US 00162376A US 16237671 A US16237671 A US 16237671A US 3804322 A US3804322 A US 3804322A
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United States
Prior art keywords
arcuate
bag
closed end
front wall
rear wall
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00162376A
Inventor
A Ericson
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Viskase Corp
Original Assignee
Union Carbide Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE786253D priority Critical patent/BE786253A/en
Application filed by Union Carbide Corp filed Critical Union Carbide Corp
Priority to US00162376A priority patent/US3804322A/en
Priority to CA143,683A priority patent/CA966453A/en
Priority to DE2231375A priority patent/DE2231375A1/en
Priority to SE7209254A priority patent/SE392702B/en
Priority to FI2009/72A priority patent/FI55315C/en
Priority to GB3278372A priority patent/GB1325289A/en
Priority to IT69259/72A priority patent/IT972429B/en
Priority to CH1055872A priority patent/CH557766A/en
Priority to DK350472A priority patent/DK132750C/en
Priority to AU44521/72A priority patent/AU469934B2/en
Priority to BR4624/72A priority patent/BR7204624D0/en
Priority to FR7225524A priority patent/FR2145699B1/fr
Priority to NL7209699A priority patent/NL7209699A/xx
Priority to JP6960472A priority patent/JPS532103B1/ja
Priority to IE990/72A priority patent/IE37604B1/en
Application granted granted Critical
Publication of US3804322A publication Critical patent/US3804322A/en
Assigned to VISKASE CORPORATION, A CORP. OF PA. reassignment VISKASE CORPORATION, A CORP. OF PA. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: UNION CARBIDE CORPORATION, A CORP. OF NEW YORK
Assigned to CONTINENTAL BANK N.A. reassignment CONTINENTAL BANK N.A. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VISKASE CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/007—Details of, or accessories for, sacks or bags for facilitating the separation of the two walls, e.g. walls of inequal height, tabs; for maintaining the mouth of the sack or bag open
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S383/00—Flexible bags
    • Y10S383/907—Peculiar, particular shape

Definitions

  • a bag for packaging food, particularly meat is composed of tubular, flexible, plastic film sealed at one end to provide an arcuate closed end, the rear wall of the tubular bag remote from the closed end being arcuate and generally parallel to the closed end, the end of the front wall of the tubular bag remote from the closed end also being arcuate and having a cut-out portion generally central of its width of a different radius from the radii of the closed end and the end of the rear wall, the rear wall having at least one aperture in the area underlying the cut-out portion of the front wall.
  • the invention relates to a flexible plastic bag for packaging food, particularly processed or uncooked meat, and refers more particularly to a bag having an arcuate closed end and a lipped arcuate open end.
  • Bags have been produced from tubular film by sealing the tube at one end and from folded film by sealing at the sides, and others have been made by sealing two superimposed films at perimetral edges.
  • the front and rear walls are the same length. These are called flush cut" bags.
  • the front wall' is shorter than the rear wall. These are called lipped bags.
  • the ends are arcuate, and in some the front wall has a cut-out portion less than the flat width of the bag.
  • the principal object of the invention is to satisfy such demand. More specifically, an object of the invention is the provision of a flexible, plastic bag adapted to use in the bagging of food products on rapid, repetitive apparatus.
  • FIGURE of the drawing is an isometric view of a bag embodying the invention by means of which these objects are attained.
  • the bag of the invention is tubular and has an arcuate seal at one end uniting the front and rear walls of the tube at that end.
  • the rear wall is also arcuately cut and is generally parallel to the sealed end.
  • the front wall of the bag at its open end is also arcuately cut, the extremities of the flat width being generally parallel to the corresponding extremities of the sealed end, and an arcuate cut-out portion of different radius from the radii of the sealed end and the rear wall is located generally centrally of the front wall at the open end of the tube.
  • a tubular bag B having a rear wall 10 and a front wall 12 joined at one end by a seal to form an arcuate closed end 14.
  • the end 16 of the rear wall 10 remote from the closed end 14 is arcuate and generally parallel to the closed end 14.
  • the extremities 18, 18a of the flat width of the front wall 12 are also arcuate and generally parallel to corresponding portions of the closed end 14.
  • an arcuate portion 20 is cut out.
  • the radius of the arcuate portion 20 is shorter than the radius of the arcuate end, the end 16 of the rear wall 10 and the extremities 18, 18a of the front wall 12, a generally crescent-shaped piece of the end of the front wall 12 having been removed.
  • apertures 22 are provided for positioning the bag B on a post or wicket not shown.
  • the aperture 22 may be circular, as shown or of other configuration including those shown in U.S. Pat. application Ser. No. 042,043; filed June 1, 1970 and assigned to the asignee of this invention.
  • the bag of the invention is made of any flexible plastic material. Of course for food use it must be approved.
  • the sealed end may be sealed in any way, heat sealing being convenient, economical, and preferred.
  • a preferred material is polyvinylidene chloride.
  • Other suitable materials are: polyolefins, e.g. polyethylene, or polypropylene; nylon; polyethylene terephthalate; polystyrene; and copolymers of those listed.
  • the bag may also be made of a laminate of the type used for food packaging.
  • the bag of the invention offers many advantages. It is preferably stacked with others on a post or wicket. Since it is a lipped bag, only the rear wall is retained by the post or wicket legs, making for easy removal by hand or by machine.
  • the arcuate closed end adapts the bag to use for items of irregular shape and makes possible close conformity between the item and the bag.
  • the bag In the case of many meat products, after the product is placed in a bag, the bag must be evacuated. In most cases this is accomplished by inserting a nozzle of an evacuating device into the neck of the bag which is then manually gathered around the nozzle.
  • ears formed at the outside extremities of the bag defined by the portions 18, 18a assist in substantially uniform gathering about the nozzle and thereby aid in efficient evacuation of the bag. In practice, the ears 18, 18a should extend about 1 to 1.5 inches beyond the operators hand when the bag is gathered about the nozzle to prevent leakage of air through the cutout portion 20 of the front wall 12 of the bag during evacuation.
  • the cut-out portion 20 of the front wall of the bag also assists in the operation just described. It should not extend too far into the front wall 10 because of waste of material. Expressing the flat width of the bag as W, the depth D measured from the tips of the ears 18, 18a to the extremity of the cut out 20 should be about 0.25 to 0.35 W to minimize waste of material and to provide optimum protection against leakage during evacuation. Specific useful dimensions are tabulated for illustration.
  • Bags made in accordance with the invention have been extensively tested on bagging machines in which they have been mounted on wickets and opened by an air stream. Such tests have indicated that the bags met the objectives of the invention.
  • a bag formed of a flattened tube of flexible thermoplastic film openable across its entire width and having an imperforate front wall;

Abstract

A bag for packaging food, particularly meat, is composed of tubular, flexible, plastic film sealed at one end to provide an arcuate closed end, the rear wall of the tubular bag remote from the closed end being arcuate and generally parallel to the closed end, the end of the front wall of the tubular bag remote from the closed end also being arcuate and having a cut-out portion generally central of its width of a different radius from the radii of the closed end and the end of the rear wall, the rear wall having at least one aperture in the area underlying the cutout portion of the front wall.

Description

United States Patent 1191 Ericson 1451 Apr. 16, 1974 [75] inventor: Alvin E. Ericson, Chicago, Ill.
[73] Assignee: Union Carbide Corporation, New
, York, NY.
221 Filed: July 14, 1971 211 Appl.No.: 162,376
3,441,198 4/1969 Ericson 229/53 Primary Examiner-Herbert F. Ross Assistant ExaminerStephen P. Garbe Attorney, Agent, or FirmFranklyn Schoenberg [5 7] ABSTRACT A bag for packaging food, particularly meat, is composed of tubular, flexible, plastic film sealed at one end to provide an arcuate closed end, the rear wall of the tubular bag remote from the closed end being arcuate and generally parallel to the closed end, the end of the front wall of the tubular bag remote from the closed end also being arcuate and having a cut-out portion generally central of its width of a different radius from the radii of the closed end and the end of the rear wall, the rear wall having at least one aperture in the area underlying the cut-out portion of the front wall.
2 Claims, 1 Drawing Figure PATENTED APR 1 5 I974 3,804 322 HNVENTOR ALVIN E. ERICSON 14 MK s44 ATTORNEY PLASTIC BAG HAVING ARCUATE CLOSED END AND ARCUATE LIPPED OPEN END The invention relates to a flexible plastic bag for packaging food, particularly processed or uncooked meat, and refers more particularly to a bag having an arcuate closed end and a lipped arcuate open end.
The food packaging industry is moving rapidly to more use of bags for perishable food items and particularly so in the area of meat products. Processed meats, such as bolognas, meat rolls, smoked hams and other familiar items and fresh meats, including poultry and fish are appearing more and more frequently as prepackaged items. Although many such prepackaged food items are prepared by wrapping the food product, sometimes on a more or less rigid support, in plastic film, the use of bags to contain the product offers many potential advantages and is growing.
While it is of course very simple to place an object in a bag, it is far more difficult to produce efficiently, economically and with full regard to sanitation and health principles packaged food items on a rapid, repetitive, commercial scale. Materials suitable for use in contact with food are relatively expensive. Meat items (except of course in the case of processed items such as bolognas) are far from uniform in shape. Despite mechanization of many of the operations in producing large numbers of food packages, manual handling is necessary.
In attacking such problems, the art has devised ingenious machines for handling bags in repetitive cycles, machines for loading the bags, devices for arraying the bags in good order for handling, and an impressive assortment of support apparatus such as conveyors, bag closing and tying machines.
The heart of the bagging system, however, is the bag itself. A number of bag structures have been shown in the patent literature. Specific reference is made to U.S. Pat. Nos. 3,441,198; 3,317,037; 3,352,411; 3,508,379; 3,156,273; and to Canadian Pat. No. 851,553. Bags have been produced from tubular film by sealing the tube at one end and from folded film by sealing at the sides, and others have been made by sealing two superimposed films at perimetral edges. In some bags, the front and rear walls are the same length. These are called flush cut" bags. In others, the front wall' is shorter than the rear wall. These are called lipped bags. In some tubular bags, the ends are arcuate, and in some the front wall has a cut-out portion less than the flat width of the bag. Despite these efforts, however, there is still demand for a bag which is economical of material, convenient to handle, and adapted to use with rapid, repetitive loading equipment.
The principal object of the invention is to satisfy such demand. More specifically, an object of the invention is the provision of a flexible, plastic bag adapted to use in the bagging of food products on rapid, repetitive apparatus.
The sole FIGURE of the drawing is an isometric view of a bag embodying the invention by means of which these objects are attained.
The bag of the invention is tubular and has an arcuate seal at one end uniting the front and rear walls of the tube at that end. At the end remote from the sealed end, the rear wall is also arcuately cut and is generally parallel to the sealed end. The front wall of the bag at its open end is also arcuately cut, the extremities of the flat width being generally parallel to the corresponding extremities of the sealed end, and an arcuate cut-out portion of different radius from the radii of the sealed end and the rear wall is located generally centrally of the front wall at the open end of the tube.
Referring to the drawing a tubular bag B is shown having a rear wall 10 and a front wall 12 joined at one end by a seal to form an arcuate closed end 14. The end 16 of the rear wall 10 remote from the closed end 14 is arcuate and generally parallel to the closed end 14. The extremities 18, 18a of the flat width of the front wall 12 are also arcuate and generally parallel to corresponding portions of the closed end 14. Generally centrally of the flat width of the front wall 12, an arcuate portion 20 is cut out. The radius of the arcuate portion 20 is shorter than the radius of the arcuate end, the end 16 of the rear wall 10 and the extremities 18, 18a of the front wall 12, a generally crescent-shaped piece of the end of the front wall 12 having been removed. In the portion of the rear wall 10 exposed by the cutout portion of the front wall 12 one or more apertures 22 are provided for positioning the bag B on a post or wicket not shown. The aperture 22 may be circular, as shown or of other configuration including those shown in U.S. Pat. application Ser. No. 042,043; filed June 1, 1970 and assigned to the asignee of this invention.
The bag of the invention is made of any flexible plastic material. Of course for food use it must be approved. The sealed end may be sealed in any way, heat sealing being convenient, economical, and preferred. For packaging meats a preferred material is polyvinylidene chloride. Other suitable materials are: polyolefins, e.g. polyethylene, or polypropylene; nylon; polyethylene terephthalate; polystyrene; and copolymers of those listed. The bag may also be made of a laminate of the type used for food packaging.
The bag of the invention offers many advantages. It is preferably stacked with others on a post or wicket. Since it is a lipped bag, only the rear wall is retained by the post or wicket legs, making for easy removal by hand or by machine. The arcuate closed end adapts the bag to use for items of irregular shape and makes possible close conformity between the item and the bag.
Inthe case of many meat products, after the product is placed in a bag, the bag must be evacuated. In most cases this is accomplished by inserting a nozzle of an evacuating device into the neck of the bag which is then manually gathered around the nozzle. In the bag of the invention ears formed at the outside extremities of the bag defined by the portions 18, 18a assist in substantially uniform gathering about the nozzle and thereby aid in efficient evacuation of the bag. In practice, the ears 18, 18a should extend about 1 to 1.5 inches beyond the operators hand when the bag is gathered about the nozzle to prevent leakage of air through the cutout portion 20 of the front wall 12 of the bag during evacuation.
The cut-out portion 20 of the front wall of the bag also assists in the operation just described. It should not extend too far into the front wall 10 because of waste of material. Expressing the flat width of the bag as W, the depth D measured from the tips of the ears 18, 18a to the extremity of the cut out 20 should be about 0.25 to 0.35 W to minimize waste of material and to provide optimum protection against leakage during evacuation. Specific useful dimensions are tabulated for illustration.
Bag Width Depth of Cut Out W" inches D" inches 4 1.375 7 2.125 lo 3.25 10 2.5 12 3.0 14 4.5 l4 3.5 6.0 24 8.5
Bags made in accordance with the invention have been extensively tested on bagging machines in which they have been mounted on wickets and opened by an air stream. Such tests have indicated that the bags met the objectives of the invention.
What is claimed is:
l. A bag formed of a flattened tube of flexible thermoplastic film openable across its entire width and having an imperforate front wall;
a rear wall; and
an arcuate closed end formed by a seal between said front wall and said rear wall at one end of said flattened tube, the end of said rear wall remote from said closed end being arcuate and parallel to said arcuate closed said rear wall being imperforate except for having at least one aperture therein adapted to receive a leg of a wicket at said end remote from said closed, end in an area underlying said cut-out portion of said front wall, the configuration of said ends of said front and rear walls thus providing ears for said bag extending well beyond the central portions of the width of said flattened tube and adapting the open end of said bag to be gathered substantially uniformly about a tubular member when such member is inserted in the open end of said bag formed by the ends of said front and rear walls remote from said closed end.
2. A bag as defined by claim I in which the radius of said arcuate cut-out portion is such that the distance D from the extremities of said ears .to the extremity of said cut-out portion is about 0.25 to 0.35 times the flat width W of said bag.

Claims (2)

1. A bag formed of a flattened tube of flexible thermoplastic film openable across its entire width and having an imperforate front wall; a rear wall; and an arcuate closed end formed by a seal between said front wall and said rear wall at one end of said flattened tube, the end of said rear wall remote from said closed end being arcuate and parallel to said arcuate closed end, the end of said front wall remote from said closed end also being arcuate, portions of said end of said front wall at and adjacent the extremities of the width of said flattened tube being parallel to said arcuate closed end, said front wall also having an arcuate cut-out portion generally central of the width of said flattened tube, the radius of said arcuate cut-out portion being shorter than the radii of said arcuate closed end and said arcuate end of said rear wall; and said rear wall being imperforate except for having at least one aperture therein adapted to receive a leg of a wicket at said end remote from said closed end in an area underlying said cutout portion of said front wall, the configuration of said ends of said front and rear walls thus providing ears for said bag extending well beyond the central portions of the width of said flattened tube and adapting the open end of said bag to be gathered substantially uniformly about a tubular member when such member is inserted in the open end of said bag formed by the ends of said front and rear walls remote from said closed end.
2. A bag as defined by claim 1 in which the radius of said arcuate cut-out portion is such that the distance ''''D'''' from the extremities of said ears to the extremity of said cut-out portion is about 0.25 to 0.35 times the flat width ''''W'''' of said bag.
US00162376A 1971-07-14 1971-07-14 Plastic bag having arcuate closed end and arcuate lipped open end Expired - Lifetime US3804322A (en)

Priority Applications (16)

Application Number Priority Date Filing Date Title
BE786253D BE786253A (en) 1971-07-14 PLASTIC BAG FOR PREPACKAGING FOOD PRODUCTS
US00162376A US3804322A (en) 1971-07-14 1971-07-14 Plastic bag having arcuate closed end and arcuate lipped open end
CA143,683A CA966453A (en) 1971-07-14 1972-06-02 Plastic bag having arcuate closed end and arcuate lipped open end
DE2231375A DE2231375A1 (en) 1971-07-14 1972-06-27 FLEXIBLE PLASTIC BAGS WITH ARC-SHAPED CURVED ENDS
DK350472A DK132750C (en) 1971-07-14 1972-07-13 PLASTIC BAG WITH CURVED UPPER AND LOWER EDGES
GB3278372A GB1325289A (en) 1971-07-14 1972-07-13 Plastic bag
IT69259/72A IT972429B (en) 1971-07-14 1972-07-13 BAG FOR THE PACKAGING OF FOOD PRODUCTS
CH1055872A CH557766A (en) 1971-07-14 1972-07-13 PLASTIC BAG FOR THE PACKAGING OF FOOD PRODUCTS.
SE7209254A SE392702B (en) 1971-07-14 1972-07-13 PLASTIC PASS WITH BACK-SHAPED, CLOSED END AND BACK-SHAPED WITH A LIP TRAINED OPEN END
AU44521/72A AU469934B2 (en) 1971-07-14 1972-07-13 Plastic bag having arcuate closed end and arcuate lipped open end
BR4624/72A BR7204624D0 (en) 1971-07-14 1972-07-13 FORMATOR BAG OF A FLEXIBLE THERMOPLASTIC FILM TUBE
FR7225524A FR2145699B1 (en) 1971-07-14 1972-07-13
NL7209699A NL7209699A (en) 1971-07-14 1972-07-13
JP6960472A JPS532103B1 (en) 1971-07-14 1972-07-13
IE990/72A IE37604B1 (en) 1971-07-14 1972-07-13 Plastics bag
FI2009/72A FI55315C (en) 1971-07-14 1972-07-13 FLEXIBEL PLASTPAOSE FOER FOERPACKNING AV FOEDOAEMNEN

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00162376A US3804322A (en) 1971-07-14 1971-07-14 Plastic bag having arcuate closed end and arcuate lipped open end

Publications (1)

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US3804322A true US3804322A (en) 1974-04-16

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US00162376A Expired - Lifetime US3804322A (en) 1971-07-14 1971-07-14 Plastic bag having arcuate closed end and arcuate lipped open end

Country Status (16)

Country Link
US (1) US3804322A (en)
JP (1) JPS532103B1 (en)
AU (1) AU469934B2 (en)
BE (1) BE786253A (en)
BR (1) BR7204624D0 (en)
CA (1) CA966453A (en)
CH (1) CH557766A (en)
DE (1) DE2231375A1 (en)
DK (1) DK132750C (en)
FI (1) FI55315C (en)
FR (1) FR2145699B1 (en)
GB (1) GB1325289A (en)
IE (1) IE37604B1 (en)
IT (1) IT972429B (en)
NL (1) NL7209699A (en)
SE (1) SE392702B (en)

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US4635295A (en) * 1984-09-18 1987-01-06 W. R. Grace & Co., Cryovac Div. Taped bag with extended side seals
US4742908A (en) * 1984-12-03 1988-05-10 Paramount Packaging Corporation Bag with soaker pad
US4815590A (en) * 1983-05-31 1989-03-28 Paramount Packaging Corporation Bag with absorbent insert
US4854451A (en) * 1986-12-17 1989-08-08 Jensen Harold A Apparatus for the manufacture of block-sealed side-gussetted bags
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US20050011115A1 (en) * 1994-03-31 2005-01-20 Weder Donald E. Method of containing a botanical item
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US20050102899A1 (en) * 1993-01-06 2005-05-19 Weder Donald E. Covering for flower pot and floral grouping
US20050221031A1 (en) * 2001-08-21 2005-10-06 Weder Donald E Flexible packaging materials and methods of making and using same
US20050262764A1 (en) * 1996-02-26 2005-12-01 Weder Donald E Sleeve with curved lower end
US20060107592A1 (en) * 1998-04-27 2006-05-25 Weder Donald E Floral sleeve having an arcuate upper end
US20060168884A1 (en) * 2005-01-18 2006-08-03 Weder Donald E Compressed packaged articles and methods of making, transporting, shipping and using same
US20070007165A1 (en) * 2005-07-07 2007-01-11 Weder Donald E Container assemblies having collapsible and erectable containers containing a packaging material
US20080040974A1 (en) * 1998-04-27 2008-02-21 Weder Donald E Floral sleeve having an arcuate upper end
US20080057229A1 (en) * 2001-08-21 2008-03-06 Weder Donald E Flexible packaging materials and methods of making and using same
US20090038218A1 (en) * 1994-03-31 2009-02-12 Weder Donald E Plant package having a decorative covering
US20090123682A1 (en) * 2007-11-08 2009-05-14 Weder Donald E Floral packaging formed of renewable or biodegradable polymer materials
US20090158655A1 (en) * 1998-04-27 2009-06-25 Weder Donald E Floral Sleeve Having An Arcuate Upper End
US20100084305A1 (en) * 1998-06-09 2010-04-08 Weder Donald E Flexible, inflatable packaging materials with decorative borders and methods of making and using same
US20130223766A1 (en) * 2012-02-24 2013-08-29 T.C. Manufacturing Company, Inc. Plastic bag with easy open means, system for opening bags and method of manufacture
US8726569B2 (en) 2001-10-05 2014-05-20 Wanda M. Weder And William F. Straeter Method of covering a pot with a floral sleeve
FR3097844A1 (en) * 2019-06-28 2021-01-01 Alexandra BARRIA Vehicle waste collection bag.

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Also Published As

Publication number Publication date
CH557766A (en) 1975-01-15
DE2231375A1 (en) 1973-02-01
FR2145699B1 (en) 1976-11-05
FI55315B (en) 1979-03-30
IT972429B (en) 1974-05-20
NL7209699A (en) 1973-01-16
CA966453A (en) 1975-04-22
AU4452172A (en) 1974-01-17
GB1325289A (en) 1973-08-01
BR7204624D0 (en) 1973-05-17
IE37604L (en) 1973-01-14
BE786253A (en) 1973-01-15
SE392702B (en) 1977-04-18
DK132750B (en) 1976-02-02
DK132750C (en) 1976-07-19
JPS532103B1 (en) 1978-01-25
FI55315C (en) 1979-07-10
AU469934B2 (en) 1976-02-26
IE37604B1 (en) 1977-08-31
FR2145699A1 (en) 1973-02-23

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