Thiophene or furan derivatives and process for preparation thereof
CA 1077050 A · Owner: Sagami Chemical Research Center · Inventors: Ogura, Katsuyuki; Tsuchihashi, Genichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Commercially advantageous processes for preparing thienylacetic acid, furylacetic acid or alkyl esters of these. Novel thiophene or furan derivatives that can be used as starting materials for preparing the above compounds. Processes for preparing these starting materials are also provided. Such compounds are useful in preparing pharmaceutical derivatives of penicillins and cephalosporins.
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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
- Granted May 6, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 6, 1997.
- 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.