Expired Canadian patentCanada
Double layer capacitors
CA 1249864 A · Owner: Standard Oil Company · Inventors: Currie, John C.; Bennett, Phillip D.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Double layer capacitors incorporate electrolytes having relatively high pH whereby reduced leakage current is attained as well as greatly extended back-up times.
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 February 7, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 7, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 26, 1986
GrantedFebruary 7, 1989
Term endedFebruary 7, 2006
Patent numberCA 1249864 A
Classification (IPC)H01G9/02 +1 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.