Expired Canadian patentCanada
Amphoteric surfactant gels
CA 1191764 A · Owner: Basf Wyandotte Corporation · Inventors: Schmolka, Irving R.
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 Amphoteric surfactant gels containing a polyoxybutylene-polyoxyethylene block copolymer which maintain their gel characteristics at temperatures below about 20°C.
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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 August 13, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 13, 2002.
- 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 19, 1982
GrantedAugust 13, 1985
Term endedAugust 13, 2002
Patent numberCA 1191764 A
Classification (IPC)C11D1/88 +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.