Expired Canadian patentCanada
Controlled-release microbe nutrients and method for bioremediation
CA 2084881 C · Owner: Grace Sierra Horticultural Products Company · Inventors: Cunningham, John
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 controlled-release nutrient source is added at a low level to a bioremediation environment to enhance microorganism growth and activity and promote the effectiveness of the bioremediation in removing environmental contaminants.
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 6, 1991 and granted January 6, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2013.
- 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 6, 1991
GrantedJanuary 6, 1998
Term endedJune 6, 2011
Patent numberCA 2084881 C
Classification (IPC)A62D3/02 +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.