Expired Canadian patentCanada
Transparent light-sensitive heat-developable sheet materials having heat-transparentizable antihalation layers
CA 866145 A · Owner: Minnesota Mining And Manufacturing Company · Inventors: George Van Dyke Tiers; Joseph A. Wiese, Jr.; George B. Rathmann
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead 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
- Granted March 16, 1971. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 16, 1988.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedMarch 16, 1971
Term endedMarch 16, 1988
Patent numberCA 866145 A
Classification (IPC)G03C
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.