Tetrazolylcoumarin derivatives, process for preparing the same and composition containing the same
CA 1165321 A · Owner: Kakenyaku Kako Co. Ltd. · Inventors: Itikawa, Kiyonoshin; Matsuda, Tetsuo; Nakano, Jun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Tetrazolylcoumarin derivatives of the general formula:, wherein R is hydrogen atom an alkyl group, an alkenyl, group, an alkoxyalkyl group or phenyl group n is an, integer of 2 to 4, and the R-O-(CH2)n-0- group is substituted at any of the 5, 6, 7 and 8 positions of the coumarin ring, and the salts thereof. The compounds are useful as antiallergic agents for preventing and treating allergic diseases.
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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 April 10, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 10, 2001.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.