Verifying digital signatures using a postal security device
CA 2427595 A1 · Owner: Mattern, James Michael · Inventors: Bystrak, Eugene Robert; Mattern, James Michael; Dutta, Rana
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for verifying printed indicia. The system comprises an indicia generating apparatus adapted to create digitally signed indicia on an item having an associated value and an indicia verifying apparatus adapted to read the indicia on the item and verify that the item is valid. The item can be used as payment for a good or service.
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 September 11, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 11, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 11, 2023.
- 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.