Novel terpene derivatives and process for preparing the same
CA 2062871 A1 · Owner: Narabe, Yukio · Inventors: Urawa, Yoshio; Narabe, Yukio; Kijima, Shizumasa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel terpenes are disclosed which are useful for the preparation of drugs, foods, perfumes and so on. A process for the preparation thereof comprises reacting a compound represented by the general formula: (II), wherein n is 0 or 1 or 2, with a compound represented by the general formula:, (III), wherein R1 represents a lower alkyl group; and R2 represents an alkyl group, a cycloalkyl group, a cycloalkylalkyl group, an aryl group, an arylalkyl group or a heteroaryl group, to form a novel terpene derivative represented by the general formula:, (I), wherein R1, R2 and n are as defined and the symbol represents a single or double bond with the proviso that the two such linkages are not …
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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 March 12, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 2014.
- 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.