Anti-inflammatory and analgesic stilbene derivatives
CA 1053257 A · Owner: Taisho Pharmaceutical Co. · Inventors: Seki, Teruya; Sasajima, Michitada; Amano, Takehiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for preparing novel stilbene derivatives represented by the general formula (I), ..........(I) wherein R1 and R2 are independently hydrogen lower alkyl, lower alkoxy, halo-, gen or haloalkyl and R3 is hydrogen or lower alkyl, which comprises hydrolysing the compounds represented by the general formula (II) ...........(II), wherein R1 and R2 are as defined above and M is chosen from -RC(R3)CH wherein R3 is as defined above, -CH2C(S)B wherein B is amino; -HC(R3)COOA wherein R3 is as defined above and A is alkyl; or -C(R3)(COOA)2 wherein R3 and A are same as defined above, in water, an organic solvent or a mixture thereof in the presence of acid or alkali, and further decarboxylating …
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 April 24, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 24, 1996.
- 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.