Expired Canadian patentCanada
Oil compositions
CA 2183267 C · Owner: Tack, Robert Dryden · Inventors: Tack, Robert Dryden; Towe, Derek Alan; Brown, Gerald Ivan
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Additives having certain hydrocarbyl groups improve the low temperature properties of hydrocarbon oils.
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 February 22, 1995 and granted November 7, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 22, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 2017.
- 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 22, 1995
GrantedNovember 7, 2000
Term endedFebruary 22, 2015
Patent numberCA 2183267 C
Classification (IPC)C10L1/18 +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.