| Patents for G09C 5 - Ciphering or deciphering apparatus or methods not provided for in other groups of this subclass, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages (2,737) |
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| 11/05/1992 | DE4207136A1 Scanning sorting and binding photocopied information - using code marks on confidential data read by photosensor to route copies to separate classified and non-classified stations |
| 10/28/1992 | EP0401258A4 Document marking system |
| 10/27/1992 | US5159635 System for encoding data in machine readable graphic form |
| 10/27/1992 | US5159630 For maintaining the security of information transmitted between machines |
| 10/07/1992 | EP0506680A1 Optimal error-detecting and error-correcting code and apparatus |
| 10/07/1992 | CN2118339U Magnetic moment coupling full insulating rotary coding device |
| 08/24/1992 | EP0573406A4 Program transmission optimisation. |
| 08/20/1992 | WO1992014187A1 Method and apparatus for delivering secured hard-copy facsimile documents |
| 07/14/1992 | US5130520 Narrow-bodied, single- and twin-windowed portable laser scanning head for reading bar code symbols |
| 06/09/1992 | US5121429 Digital signal processing |
| 06/03/1992 | EP0487873A2 Sheets for concealing information recorded on facsimile recording paper and method of concealing information using such sheets |
| 05/29/1992 | CA2053013A1 Sheets for concealing information recorded on recording paper for use with a facsimile and method of concealing information recording paper by the use of the concealment sheet |
| 05/20/1992 | EP0485996A2 Flexible merchandise checkout and inventory management system |
| 05/14/1992 | CA2055363A1 Flexible merchandise checkout and inventory management system |
| 05/12/1992 | US5113445 System for encoding data in machine readable graphic form |
| 04/21/1992 | US5107100 Portable scanner with on-board keyboard, display, transceiver and printer |
| 04/01/1992 | EP0477570A2 Security system for electronic printing systems |
| 03/25/1992 | EP0476283A1 Keyboard using secret coding process for protected data input |
| 02/11/1992 | US5088093 Self-correcting registers, error-detecting/correcting registers, and inversion coding using one bit, and other information storage media |
| 02/04/1992 | US5085469 Flexible composite recording material for facsimile machines |
| 01/16/1992 | DE4021783A1 Copying and enciphering device - includes intermediate store for scanned data prior to encoding via keyboard or magnetic card |
| 01/15/1992 | EP0466146A2 Graphic matter and process and apparatus for producing, transmitting and reading the same |
| 01/09/1992 | DE4021061A1 Coded protection for transmitted facsimile data - subjecting line scanned data to bit shifting to maintain confidentiality |
| 01/04/1992 | WO1992001278A1 System for the secure storage and transmission of data |
| 01/02/1992 | DE4019975A1 Facsimile receiver with automatic envelope device - uses application of pressure and heat to bond assembled sheet stack together |
| 12/31/1991 | US5077795 Security system for electronic printing systems |
| 12/31/1991 | CA1293805C Authenticating pseudo-random code and apparatus |
| 12/17/1991 | CA1293324C Thermally readable surface characterization arrangement |
| 11/28/1991 | WO1991018376A1 Processes and products for generating documents with inherent confidentiality |
| 11/28/1991 | WO1991018357A1 Imaging method and uses of same |
| 11/21/1991 | EP0456920A2 Remote authentication and authorisation in a distributed data processing system |
| 11/13/1991 | EP0456553A1 Method for obtaining a secure authentification in clear text in a distributed information system environment |
| 10/08/1991 | US5056142 Decryption device |
| 10/08/1991 | US5056137 Method and apparatus for encoding and decoding signals |
| 10/02/1991 | EP0449349A1 Method for the modular reduction of numbers |
| 09/10/1991 | US5047617 Narrow-bodied, single- and twin-windowed portable laser scanning head for reading bar code symbols |
| 09/03/1991 | US5046094 Server-aided computation method and distributed information processing unit |
| 08/08/1991 | WO1991011794A1 Equipment for protecting data in a data-processing system |
| 07/23/1991 | US5034982 Lenticular security screen production method |
| 07/17/1991 | EP0436575A1 A paper web for issuing bills in check form |
| 06/25/1991 | US5027401 System for the secure storage and transmission of data |
| 06/12/1991 | CN1052079A Method of providing protected printed information |
| 05/16/1991 | WO1991006353A1 A method of providing protected printed information and a paper substrate using the method |
| 05/02/1991 | WO1991006068A1 Optimal error-detecting and error-correcting code and apparatus |
| 04/18/1991 | WO1991005421A1 Method and apparatus for encoding and decoding signals |
| 04/02/1991 | US5005200 Public key/signature cryptosystem with enhanced digital signature certification |
| 03/27/1991 | EP0418742A1 Method and device for secure data transmission |
| 03/19/1991 | US5001749 Thermally-activated receiving medium for use in a facsimile transmission system |
| 03/19/1991 | CA2025504A1 Method and device for the protected transmission of data |
| 03/07/1991 | WO1991003112A1 Program transmission optimisation |
| 03/05/1991 | US4998010 Polygonal information encoding article, process and system |
| 02/22/1991 | CA2023736A1 Image recording apparatus |
| 02/13/1991 | CN1011635B Secure placement of confidential information on circulated blank ticket |
| 02/07/1991 | DE3928501A1 Confidential transmission of written documents - using data at edges or end of sheet to enable decoding by recipient |
| 01/02/1991 | EP0265497A4 Information transfer and use, particularly with respect to objects such as gambling chips |
| 12/12/1990 | EP0401258A1 Document marking system. |
| 11/20/1990 | US4972475 Authenticating pseudo-random code and apparatus |
| 10/31/1990 | EP0394426A1 Method and apparatus for scrambling and unscrambling bar code symbols. |
| 09/12/1990 | EP0386867A2 Improved public key/signature cryptosystem with enhanced digital signature certification |
| 09/07/1990 | WO1990010349A1 Security facsimile transmission system |
| 08/21/1990 | CA1273107A1 Postage meter with coded graphic information in the indicia |
| 08/14/1990 | US4949381 Electronic indicia in bit-mapped form |
| 06/06/1990 | EP0371787A2 Decryption device |
| 06/05/1990 | US4932057 Parallel transmission to mask data radiation |
| 04/24/1990 | US4919545 Distributed security procedure for intelligent networks |
| 04/24/1990 | CA1268253A1 Portable handheld terminal including optical bar code reader and electromagnetic transceiver |
| 04/19/1990 | WO1990004245A1 Method and apparatus for scrambling and unscrambling bar code symbols |
| 04/18/1990 | CN1041316A Paper web for issuing bills in check form |
| 04/10/1990 | US4916739 Adhesive photocopyable transparency for use in a secure facsimile transmission system |
| 04/05/1990 | WO1990003276A1 A paper web for issuing bills in check form |
| 04/03/1990 | US4914700 Method and apparatus for scrambling and unscrambling bar code symbols |
| 03/28/1990 | EP0360225A2 Apparatus for applying indicia in accordance with an encrypted message |
| 03/27/1990 | US4912761 Security facsimile systems |
| 03/21/1990 | EP0359729A2 Encryption with subsequent source coding |
| 03/06/1990 | US4906837 Multi-channel waveguide optical sensor |
| 02/14/1990 | CN1039672A Hexagonal information encoding article process and system |
| 01/23/1990 | US4896355 Device for photocopying a document |
| 01/23/1990 | US4896029 Polygonal information encoding article, process and system |
| 01/10/1990 | EP0350278A2 Digital signal processing |
| 01/03/1990 | CN2050642U Infrared secret code card controller |
| 12/19/1989 | US4888475 Thermally readable encoding and activation thereof |
| 10/19/1989 | WO1989009979A1 Polygonal information encoding article, process and system |
| 10/17/1989 | US4874936 Hexagonal, information encoding article, process and system |
| 10/11/1989 | EP0336778A2 Polygonal information decoding process and apparatus |
| 10/11/1989 | EP0336769A2 Hexagonal information encoding article, process and system |
| 09/19/1989 | US4868877 Public key/signature cryptosystem with enhanced digital signature certification |
| 09/12/1989 | US4866773 System for interfacing a digital encryption device to a time-division multiplexed communication system |
| 08/24/1989 | WO1989007819A1 Document marking system |
| 08/16/1989 | EP0328232A2 Public key/signature cryptosystem with enhanced digital signature certification |
| 08/10/1989 | DE3824311A1 Method for coding and decoding a signal and device for carrying out said method |
| 07/18/1989 | US4850009 Portable handheld terminal including optical bar code reader and electromagnetic transceiver means for interactive wireless communication with a base communications station |
| 07/04/1989 | US4845350 Narrow-bodied, single-and twin-windowed portable laser scanning head for reading bar code symbols |
| 05/30/1989 | US4835713 Postage meter with coded graphic information in the indicia |
| 04/20/1989 | WO1989003557A1 Self-correcting registers, error-detecting/correcting registers, and inversion coding using one bit, and other information storage media |
| 03/21/1989 | US4814589 Information transfer and use, particularly with respect to objects such as gambling chips |
| 01/26/1989 | DE3723856A1 Identification of lost items |
| 10/04/1988 | US4776013 Method and apparatus of encryption of optical images |
| 08/17/1988 | EP0278740A2 A method for encrypting a code and an encryption device |
| 06/22/1988 | EP0271673A1 Multi-layer document |
| 06/08/1988 | CN87104189A Thermally readable surface characterisation arrangement and method and apparatus for temp. activation thereof |