Treatment of arsine removal catalysts
CA 2026567 C · Owner: Aristech Chemical Corporation · Inventors: Cullo, Leonard A.; Restelli, Edward F. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Supported metal oxide catalysts such as lead oxide catalysts are rejuvenated after absorbing arsenic compounds from hydrocarbon steams (such as propylene) by heating them in an inert oxygen-free, atmosphere, optionally with moisture present.
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 March 5, 1990 and granted April 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 2012.
- 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.