Process for producing an aromatic carbonate
CA 2223986 C · Owner: Komiya, Kyosuke · Inventors: Fukuoka, Shinsuke; Tojo, Masahiro; Komiya, Kyosuke
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 aromatic carbonate by subjecting a starting compound selected from the group consisting of dialkyl carbonates alkyl aryl carbonates and mixtures thereof and a reactant selected from the group consisting of aromatic mono-hydroxyl compounds alkyl aryl carbonates , and mixtures thereof to transesterification in the presence of a metalcontaining catalyst, characterized in that the transesterification is conducted while keeping the weight ratio (WR) of at least one substance having an aromatic group selected from the group consisting of specific aromatic polyhydroxyl compounds resulting from the starting compound the reactant , and/or by-products of the …
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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 September 20, 1996 and granted August 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 20, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 2018.
- 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
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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.