Unique digital signature
CA 2340367 A1 · Owner: Gibbs, Benjamin K. · Inventors: Roeder, G. R. Konrad; Gibbs, Benjamin K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for a unique digital signature is provided. According to one aspect of the invention, a unique digital signature (132) comprises an adapted digital signature (144) and a service id (136). The adapted digital signature (144) provides temporary or restricted privileges for a particular electronic service. According to one embodiment only a fixed number of uses of the unique digital signature (132), corresponding to an index number (112) are allowed. In one embodiment, the electronic service is electronic message forwarding. In another embodiment, the electronic service is electronic media delivery. An authentication log file is maintained for recording status …
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 July 30, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 30, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 2021.
- 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.