Canadian application, no grantCanada
Authentication of items using transient optical state change materials
CA 2497645 A1 · Owner: Vig, Rakesh · Inventors: Selinfreund, Richard H.; Gerger, Scott; Vig, Rakesh
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The use of transient optical state change security materials to authenticate items.
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 26, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 26, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 26, 2025.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 26, 2003
GrantedNo grant recorded
Term endedSeptember 26, 2023
Patent numberCA 2497645 A1
Classification (IPC)G09C3/00
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.