Expired Canadian patentCanada
Thin carbon plate suitable for use as fuel cell separator
CA 2004135 C · Owner: Saito, Kazuo · Inventors: Saito, Kazuo; Imashiro, Yasuo
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 thin carbon plate obtained by forming a polycarbodiimide resin or a mixture of a polycarbodiimide resin and polycarbodiimide fibers into a thin plate and carbonizing the thin plate. This thin carbon plate is suitable for use as a fuel cell separator.
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
- Filed November 29, 1989 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2011.
- 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 29, 1989
GrantedSeptember 21, 1999
Term endedNovember 29, 2009
Patent numberCA 2004135 C
Classification (IPC)H01M2/14 +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.