Encryption key control system for mail processing system having data center verification
CA 2133679 C · Owner: Kim, Hyung-Kun Paul · Inventors: Pintsov, Leon A.; Kim, Hyung-Kun Paul; Cordery, Robert A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A key control system comprises the generation of a first set of keys which are then used for a plurality of respective postage meters. The keys are then related to a respective meter in accordance with a map or algorithm. The keys may be changed by entering the second key via an encryption using the first key.
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 October 5, 1994 and granted December 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 5, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 5, 2016.
- 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.