Process for the preparation of an alkyl methacrylate
CA 2014152 C · Owner: Lucite International Uk Limited · Inventors: Van Ravenswaay Claasen, Johan C.; Doyle, Michael J.; Van Gogh, Johan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of an alkyl methacrylate, which comprises:, a) selectively removing propadiene from a C3-mixture comprising a mixture of propyne and propadiene that has been obtained from an ethene cracker a, catalytic cracker or an LPG-dehydrogenation process, to afford a propyne feed in which the ratio of propyne to propadiene is ~ 6, and b) contacting the propyne feed with carbon monoxide and an alkanol in the presence of a carboxylation catalyst.
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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 April 9, 1990 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 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.