Canadian application, no grantCanada
Antifoggant for dry silver
CA 2111494 A1 · Owner: Kirk, Mark P. · Inventors: Kirk, Mark P.; Mott, Andrew W.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound of the formula:, (I), wherein; R is a member selected from a hydrogen atom an, alkyl group, an aryl group or a heterocyclic group. The compounds find utility as antifoggants and image stabilisers in photothermographic materials.
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 December 15, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 15, 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.
FiledDecember 15, 1993
GrantedNo grant recorded
Term endedDecember 15, 2013
Patent numberCA 2111494 A1
Classification (IPC)C07D285/12 +2 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.