Expired Canadian patentCanada
Pyrolysis of naturally occurring cresylic acid mixtures
CA 2070754 C · Owner: Brient, James A. · Inventors: Strunk, Marvin H.; Brient, James 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
A process for removing guaiacols from naturally occurring cresylic acid mixtures by pyrolysis is described.
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 June 9, 1992 and granted February 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 9, 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.
FiledJune 9, 1992
GrantedFebruary 26, 2002
Term endedJune 9, 2012
Patent numberCA 2070754 C
Classification (IPC)C07C39/07 +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.