Expired Canadian patentCanada
Compositions pitch control
CA 1091870 A · Owner: Nalco Chemical Company · Inventors: Payton, James H.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pitch formation in paper mill pulp systems may be inhibited by treating such systems at a point prior to where pitch deposits normally occur with at least 0.5 ppm based on the weight of the pulp of a composition comprising:,
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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 December 23, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 23, 1997.
- 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 13, 1976
GrantedDecember 23, 1980
Term endedDecember 23, 1997
Patent numberCA 1091870 A
Classification (IPC)D21H21/02 +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.