Expired Canadian patentCanada
Unsaturated polyethers possessing a plurality of =ch2 attached to the chain, and their preparation from polyepihalohydrins
CA 952647 A · Owner: Shell Oil Company · Inventors: Petty, Walter L.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordNo Claude kit for weapons
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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.
Why it's free to use
- Granted August 6, 1974. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 6, 1991.
- 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—
GrantedAugust 6, 1974
Term endedAugust 6, 1991
Patent numberCA 952647 A
Classification (IPC)C08L71/02 +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.