Expired Canadian patentCanada
Dielectric film of a copolymer of vinylidene fluoride and tetrafluoroethylene
CA 1289313 C · Owner: Pennwalt Corporation · Inventors: Wickwire, Dean Hedge; Wempe, Lawrence Kyran; Bloomfield, Philip Earl
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 dielectric film of a molecularly oriented copolymer of vinylidene fluoride and tetrafluoroethylene a process, of preparing such film and a capacitor produced from such film are disclosed herein.
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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 24, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 24, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 9, 1987
GrantedSeptember 24, 1991
Term endedSeptember 24, 2008
Patent numberCA 1289313 C
Classification (IPC)H01B3/44 +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.