Expired Canadian patentCanada
Method of manufacturing oriented amorphous aromatic polymeric films
CA 1084225 A · Owner: Sumitomo Chemical Co. Ltd. · Inventors: Hayashida, Haruo; Okumura, Takuzo; Uemura, Yukikazu
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 method for producing a high-strength film of amorphous aromatic high polymers comprising rolling said polymer between rolls, and stretching the rolled film of said polymer. .
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
- Granted August 26, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 26, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 24, 1977
GrantedAugust 26, 1980
Term endedAugust 26, 1997
Patent numberCA 1084225 A
Classification (IPC)B29C55/18
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.