Synthesis of oxygen-substituted benzocycloheptenes, used as valuable intermediate products for producing tissue-selective oestrogens
CA 2464435 A1 · Owner: Kirstein, Holger · Inventors: Beckmann, Wolfgang; Kirstein, Holger; Niedballa, Ulrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to intermediate products and a novel method for producing benzocycloheptene C. The inventive method for producing the novel intermediate products of said compound is based on cost-effective starting materials, produces the intermediate stages with high yields and a high purity, without recourse to chromatographic purification steps and allows production on a large scale.
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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 October 14, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 14, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 14, 2024.
- 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.