Method to treat rhodium-containing solutions
CA 1338517 C · Owner: Polysar Limited · Inventors: Osman, Akhtar; Bradford, William Gordon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a method to treat a rhodium-containing solution obtained by the catalytic hydrogenation of nitrile rubber by adding an additive selected from thiourea, polysaccharide and activated carbon to form a rhodium-containing precipitate which is then separated from the solution by, for example filtration or centrifugation to yield a hydrogenated nitrile rubber solution containing a reduced level of rhodium .
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
- Granted August 13, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 13, 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.
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.