Expired Canadian patentCanada
Tertiaryaminoalkyl-hydroxyalkyl ethers of polygalactomannans
CA 1308710 C · Owner: Phelps, Martha A. · Inventors: Karcher, Dennis J.; Morgan, Michael E.; Phelps, Martha A.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Dialkylaminoalkyl-hydroxyalkyl ethers of polygalactomannan are useful as thickening agents for aqueous fluids.
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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 October 13, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 13, 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.
FiledFebruary 13, 1989
GrantedOctober 13, 1992
Term endedOctober 13, 2009
Patent numberCA 1308710 C
Classification (IPC)C08B37/00 +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.