Process for the preparation of benzyl-ethers
CA 2272384 A1 · Owner: Chinoin Gyogyszer Es Vegyeszeti Termekek Gyara Rt. · Inventors: Arvai, Geza; Pap, Laszlo; Bertok, Bela
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The subject of the invention is the process for the preparation of mixed ethers of general formula (I), wherein Ar represents an alicyclic aromatic or , one or more heteroatom-containing heterocyclic moiety optionally substituted , by one or more C1-4 alkoxy methylenedioxy, C1-4 alkyl, halogen, C1-4 haloalkyl or nitro-group, and/or condensed with a benzine ring R1 and R2 , independently mean hydrogen C1-4 alkyl C1-4 haloalkyl, C2-4 alkenyl, phenyl, substituted phenyl C3-6 cycloalkyl group, R3 means C1-6 alkyl C3-6 alkenyl, or C3-6 alkynyl group, optionally substituted by one or more C1-6 alkyl C3-6 , alkenyl, C3-6 alkynyl, C1-6 haloalkyl group or halogen atom; or a C1-4 , alkyloxy-C1-4 …
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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 November 12, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2019.
- 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.