Alkylation catalyst regeneration
CA 2099359 C · Owner: Phillips Petroleum Company · Inventors: Eastman, Alan D.; Abbott, Ronald G.; Eldridge, Robert B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described is A novel process which utilizes a reversible base as a contact material for removing A portion of a contaminating amount of ASO contained in a mixture of a sulfone component and a hydrogen halide component to produce a treated sulfone-containing mixture. The treated sulfone-containing mixture can further be processed by contacting it with an adsorbent material.
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 28, 1993 and granted June 15, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 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.
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.