Expired Canadian patentCanada
A method for electrostatically processing crude salts at high levels of ambient humidity
CA 2086790 C · Owner: Stahl, Ingo · Inventors: Fricke, Gunter; Beier, Peter-Michael; Stahl, Ingo
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Glycolic acid is used as an auxiliary conditioning agent for improving the yields during the electrostatic separation of crude potash salts at high levels of humidity in the ambient air.
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 January 6, 1993 and granted October 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 6, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 6, 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.
FiledJanuary 6, 1993
GrantedOctober 29, 2002
Term endedJanuary 6, 2013
Patent numberCA 2086790 C
Classification (IPC)C01D1/28 +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.