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Brevets

Référencé par

Brevet citant Date de dépôt Date de délivrance Cessionnaire d'origine Titre
US396195615 mai 19758 juin 1976Fuji Photo Film Co., Ltd.Method for production of and distinction between combined validification and identification photographs
US403906611 août 19752 août 1977Sweda International, Inc.Forgery-resistant impact printing with matrix printer
US404035328 oct. 19759 août 1977OPI Metriservice, Societe AnonymeProcess for coloring surfaces
US414396730 mai 197813 mars 1979Benjamin J. HaggquistLatent photo system
US416808815 déc. 197718 sept. 1979Burroughs CorporationProtected document and method of making the same
US41757765 janv. 197827 nov. 1979New England Mutual Life Insurance CompanyCounterfeit resistant document
US42277208 nov. 197814 oct. 1980Burroughs CorporationProtected document
US426546918 mai 19775 mai 1981Burroughs CorporationProtected document and method of making same
US431018023 juil. 198012 janv. 1982Burroughs CorporationProtected document and method of making same
US435154711 oct. 197928 sept. 1982Burroughs CorporationSecurity document and method for making same using an alternating dot pattern
US45793706 juil. 19841 avr. 1986Burroughs CorporationMulti-tone cancellation phrase and background
US46324308 mai 198430 déc. 1986Secure and self-verifiable image
US466859718 févr. 198626 mai 1987Dormant tone imaging
US46845932 mai 19864 août 1987Secure Images Inc.Secure and self-verifiable image
US478039718 août 198625 oct. 1988Hosokawa Printing Co., Ltd.Process for preparing film positive sheets for forging-by-copying-proof prints and prints therefrom
US486748124 févr. 198819 sept. 1989Nocopi International Inc.Anti-photocopying paper and/or anti-telefacsimile paper
US501876718 janv. 198928 mai 1991Schmeiser, Morelle & WattsCounterfeit protected document
US517841825 juin 199112 janv. 1993Canadian Bank Note Co., Ltd.Latent images comprising phase shifted micro printing
US51938533 avr. 199216 mars 1993Nonreplicable document and method for making same
US519776512 juil. 199130 mars 1993The Standard Register CompanyVarying tone securing document
US52912435 févr. 19931 mars 1994Xerox CorporationSystem for electronically printing plural-color tamper-resistant documents
US53126565 févr. 199317 mai 1994Mattel, Inc.Toy picnic set having latent image placemat
US53401591 mars 199323 août 1994The Standard Register CompanyVarying tone security document
US543697412 oct. 199325 juil. 1995Innovator CorporationMethod of encoding confidentiality markings
US544920019 oct. 199312 sept. 1995Domtar, Inc.Security paper with color mark
US548756724 avr. 199230 janv. 1996Francois-Charles Oberthur GroupPrinting method and copy-evident secure document
US548866422 avr. 199430 janv. 1996Yeda Research and Development Co., Ltd.Method and apparatus for protecting visual information with printed cryptographic watermarks
US57226933 oct. 19963 mars 1998Embossed document protection methods and products
US573475224 sept. 199631 mars 1998Xerox CorporationDigital watermarking using stochastic screen patterns
US57355473 janv. 19977 avr. 1998Anti-photographic/photocopy imaging process and product made by same
US578828519 juin 19964 août 1998Document protection methods and products
US579070321 janv. 19974 août 1998Xerox CorporationDigital watermarking using conjugate halftone screens
US600072824 janv. 199414 déc. 1999The Standard Register CompanySecurity document
US623108216 févr. 200015 mai 2001Documotion Research, Inc.Tamper-evident form for securely carrying information
US643030210 janv. 20016 août 2002Digimarc CorporationSteganographically encoding a first image in accordance with a second image
US64817539 févr. 200119 nov. 2002Documotion Research, Inc.Form for concealing variable printed information
US653875719 mai 200025 mars 2003Pitney Bowes Inc.Method for automatically reading electronic tickets
US660356819 mai 20005 août 2003Pitney Bowes Inc.System and method for issuing electronic tickets
US66908118 déc. 200010 févr. 2004The Hong Kong University of Science and TechnologyMethods and apparatus for hiding data in halftone images
US68650017 août 20028 mars 2005Pacific Holographics, Inc.System and method for encoding and decoding an image or document and document encoded thereby
US699126030 oct. 200231 janv. 2006Xerox CorporationAnti-counterfeiting see-through security feature using line patterns
US705819914 août 20006 juin 2006The Hong Kong University of Science and TechnologyMethods and apparatus for hiding data in halftone images
US74668768 oct. 200716 déc. 2008Graphic Security Systems Corp.System and method for digital image encoding
US769771522 sept. 200513 avr. 2010The Hong Kong University of Science and TechnologyMethods and apparatus for hiding data in halftone images
US777181620 avr. 200710 août 2010Agfa-Gevaert NVInformation carrier precursor and information carrier produced therewith
US779675329 déc. 200414 sept. 2010Graphic Security Systems CorporationDigital anti-counterfeiting software method and apparatus
US780497722 août 200628 sept. 2010The Hong Kong University of Science and TechnologyMethods and apparatus for hiding data in halftone images
US790619810 mai 200415 mars 2011Document containing security images
US792768920 avr. 200719 avr. 2011Agfa-Gavaert N.V.Information carrier precursor and information carrier produced therewith
US793912420 avr. 200710 mai 2011Agfa-Gevaert, N.V.Method of producing an information carrier
US797606827 avr. 200712 juil. 2011Document Security Systems, Inc.Double-blind security features
US79829177 mars 200719 juil. 2011Document Security Systems, Inc.Document containing scanning survivable security features
US807120120 avr. 20076 déc. 2011Agfa-Gevaert N.V.Information carrier precursor and information carrier produced therewith
US817027423 sept. 20101 mai 2012The Hong Kong University of Science and TechnologyMethod and apparatus for hiding data for halftone images