Expired Canadian patentCanada
Thermographic and photothermographic imaging materials
CA 2111687 C · Owner: Polaroid Corporation · Inventors: Young, Kent M.; Freedman, James R.; Sofen, Stephen R.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Photothermographic and thermographic diffusion transfer image-recording materials are provided wherein an auxiliary ligand for silver ions is employed to enhance transfer image density and discrimination.
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 27, 1993 and granted April 8, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 27, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 27, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 27, 1993
GrantedApril 8, 1997
Term endedJuly 27, 2013
Patent numberCA 2111687 C
Classification (IPC)G03C1/49 +1 more
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.