Expired Canadian patentCanada
Ampiq copolymers as scale inhibitors
CA 1296594 C · Owner: Nalco Chemical Company · Inventors: Fong, Dodd W.
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 method is disclosed to control calcium phosphate scale by using an effective amount of an ampholytic polymer synthesized from acrylic acid, methacrylic acid and the, quaternary salts of 1-acryloyl-4-methyl piperizine or, mixtures thereof.
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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 3, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 3, 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.
FiledDecember 10, 1986
GrantedMarch 3, 1992
Term endedMarch 3, 2009
Patent numberCA 1296594 C
Classification (IPC)C23F11/10 +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.