Expired Canadian patentCanada
Epoxy hardeners
CA 1319781 C · Owner: W.R. Grace & Co.-Conn. · Inventors: Lin, Shiow C.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to the use of compositions of the formula:, wherein n is 2 to 4 and X is -O- -S- or , wherein R1 is an aliphatic or aromatic moiety as a curing agent for epoxy resins to form a thermoset material which has a reduced shrinkage.
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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 June 29, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 29, 2010.
- 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 21, 1987
GrantedJune 29, 1993
Term endedJune 29, 2010
Patent numberCA 1319781 C
Classification (IPC)C08G59/40 +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.