Alkenyltetrazole derivatives
CA 1332607 C · Owner: Ohtani, Mitsuaki · Inventors: Hagishita, Sanji; Matsuura, Takaharu; Seno, Kaoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Tetrazole derivatives represented by the formula: wherein R is naphthyl or phenyl optionally substituted by phenyl lower alkyl, halogen, lower alkoxy, hydroxy or acetoxy; X is methylene, dimethylmethylene or oxygen; n is an integer of 0 or 1; and p and r each is an integer of 0 or 1 and q is an integer of 1 or 2 provided that p + q + r = 2; or a tautomer in tetrazole ring and a pharmaceutically acceptable salt thereof which are useful, as TXA2 receptor antagonist.
Read the whole patent
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 October 18, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 18, 2011.
- 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.