Expired Canadian patentCanada
Process for treatment of separator for sodium hydrosulfite membrane cell
CA 1302802 C · Owner: Cawlfield, David William · Inventors: Cawlfield, David William
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 process for treating the surfaces of a polymeric separator mesh for use in an electrochemical cell between an anode and a membrane to obtain a hydrophilic coating.
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 June 9, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 9, 2009.
- 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 20, 1988
GrantedJune 9, 1992
Term endedJune 9, 2009
Patent numberCA 1302802 C
Classification (IPC)B32B3/24 +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.