Expired Canadian patentCanada
Method for cleaning or extracting hydrocarbon based substances
CA 2059488 C · Owner: Fandrick, Archie · Inventors: Fandrick, Archie
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 for cleaning hydrocarbon based grease from oven surfaces or extracting, hydrocarbons from soil, sand clay and cloth uses a composition comprising an aqueous, solution of hydrogen peroxide and an alkali metal hydroxide.
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 January 16, 1992 and granted August 24, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 16, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 16, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 16, 1992
GrantedAugust 24, 1999
Term endedJanuary 16, 2012
Patent numberCA 2059488 C
Classification (IPC)C11D7/18 +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.