Time validation system
CA 2395026 C · Owner: Wajs, Andrew Augustine · Inventors: Wajs, Andrew Augustine
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for time validation comprises a termi- nal (1) with means (7,7') for tuning in to a number of different carrier frequencies (a-e) an authorisation de- vice (6), e.g. a smart card capable of communicating with the terminal (1) and means (2,5) to transmit time stamps using a modulated signal having a carrier frequency to the terminal (1). The authorisation device (6) comprises means (8) for selecting a carrier frequency to tune in to for retrieving a time stamp. A terminal (1) and authorisa- tion device (6) are provided for use in the system. A computer program is suitable for loading into a programmable device e.g. a smart card, to use it as an authorisation de- vice (6) for use in …
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 25, 2002 and granted May 7, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 25, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 25, 2024.
- 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.