Expired Canadian patentCanada
Detergent composition
CA 2255594 C · Owner: Askew, Stuart Clive · Inventors: Sorrie, Graham Alexander; Askew, Stuart Clive
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a detergent composition comprising an anionic and a cationic surfactant, an acid source and an alkaline source capable of reacting together in the presence of water to produce a gas.
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
- Filed May 16, 1997 and granted July 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 16, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 16, 1997
GrantedJuly 23, 2002
Term endedMay 16, 2017
Patent numberCA 2255594 C
Classification (IPC)C11D1/65 +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.