Expired Canadian patentCanada
Thermotropic liquid-cristalline aromatic polyesters
CA 1307072 C · Owner: Chapoy, L. Lawrence · Inventors: Coassolo, Alfredo; Chapoy, L. Lawrence; Sabarino, Giampiero
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Thermotropic liquid-crystalline aromatic polyesters of 4,4'-dihydroxy-diphenyl substituted with a halogen or with an alkyl, cycloalkyl, aryl, aralkyl, keto or ether radical.
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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 September 1, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 23, 1988
GrantedSeptember 1, 1992
Term endedSeptember 1, 2009
Patent numberCA 1307072 C
Classification (IPC)C08G63/60 +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.