Encryption / decryption apparatus for a computer
CA 2010700 C · Owner: Dyke, John · Inventors: Dyke, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A host computer add on encryption/decryption printed circuit board includes address and control buffers data buffer and board decode logic, having input and output terminals selectively connected to the host computer and to first ports of a dual port random access memory (DPR) for storing a block of data and addresses and inputting portions of the block of data and addresses into the DPR's memory. A central processing unit (CPU) is connected to second ports of the DPR, and to a CPU RAM CPU ROM, real, time clock, key image buffer and DES encryption device. The CPU pursuant to commands of the host computer fetches: (1) the encryption/decryption key of the key image buffer and information from …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed February 22, 1990 and granted September 3, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.