Efficient electronic money
CA 2182173 C · Owner: Tti Inventions C Llc · Inventors: Yacobi, Yacov
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A unique electronic cash (14) system protects the privacy of users (12) in legitimate transactions while at the same time enabling the detection (32) of a double spender of the same electronic coin (14). The electronic cash system takes advantage of a unique property of El Gamal signatures to achieve these results.
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 17, 1995 and granted January 23, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 17, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 2017.
- 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.