Expired Canadian patentCanada
Injection of dextrins for subterranean microbial processes
CA 2104560 C · Owner: Clark, James Bennett · Inventors: Clark, James Bennett; Wood, Willis A.; Davey, Mary Ellen
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 use of a dextrin as the carbon source for achieving a complete nutrient medium capable of sustaining microbial activity in subterranean formations is disclosed.
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 August 20, 1993 and granted May 27, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 20, 1993
GrantedMay 27, 1997
Term endedAugust 20, 2013
Patent numberCA 2104560 C
Classification (IPC)C12N1/20 +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.