Removal of selenium from urethane solutions
CA 1088275 A · Owner: Atlantic Richfield Company · Inventors: Washall, Thomas A.; Morgan, Harry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the removal and recovery of selenium by liquid-liquid extraction from urethane containing selenium compound by contacting a hydrocarbon solvent solution of the selenium-containing urethane at a suitable temperature with an aqueous ammonium hydroxide or alkali metal hydroxide solution and recovering the selenium from the resulting selenium compound enriched aqueous hydroxide phase; the deselenized urethane remaining in hydrocarbon phase.
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 October 28, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 28, 1997.
- 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.