Expired Canadian patentCanada
Galvanic post-treatment of etched aluminum capacitor foil
CA 1164404 A · Owner: Sprague Electric Company · Inventors: Bernard, Walter J.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Residual chlorides are removed from electrochemically etched aluminum foil by coupling the foil to an inert electrode having a low hydrogen overvoltage while contacting the foil with nitric acid.
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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 March 27, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 2001.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 2, 1981
GrantedMarch 27, 1984
Term endedMarch 27, 2001
Patent numberCA 1164404 A
Classification (IPC)C25F3/04 +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.