Dihydropyridine-5-phosphonic acid cyclic propylene ester
CA 1304379 C · Owner: Sakoda, Ryozo · Inventors: Tanaka, Sakuya; Seto, Kiyotomo; Sakoda, Ryozo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound of the formula: (I), wherein each of R1, R2, R3, R4, R5 and R6 which may be the same or different, is hydrogen or C1-C4 alkyl; one of X1 and X2 is nitro, fluorine, chlorine, difluoromethoxy or trifluoromethyl and the other is hydrogen or both of X1 and, X2 are chlorine; and Y is wherein A is C2-C6 aklylene, each of Ar1 and Ar2 which may be the same or different, is phenyl which may be substituted by chlorine, fluorine or C1-C3 alkoxy, and m is an integer of from 0 to 4, or Y is, wherein A, Ar1 and Ar2 are as defined above when both X1 and 2 are chlorine or when X1 is hydrogen and 2 is difluoromethoxy; or a pharmaceutically acceptable salt thereof.
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 June 30, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 30, 2009.
- 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.