Expired Canadian patentCanada
Dewatering method
CA 2070910 C · Owner: Stefanski, Maria · Inventors: Sirois, Louis L.; Stefanski, Marek J.; Stefanski, Maria
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 to improve dewatering of filter cakes in a filtration process. The method involves introducing a surfactant as a vapor or mist into a flow of steam and treating the filter cake with this gaseous mixture.
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 10, 1992 and granted February 15, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 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 10, 1992
GrantedFebruary 15, 1994
Term endedJune 10, 2012
Patent numberCA 2070910 C
Classification (IPC)F26B3/06 +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.