3-hydroxy-4-(hydroxymethyl)benzoic acid and alkyl esters thereof
CA 1135277 A · Owner: Banyu Pharmaceutical Co. Ltd. · Inventors: Morishima, Hajime; Matsumoto, Ikuo; Umezawa, Hamao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
S OF THE DISCLOSURE:, A now compound is produced which has the general formula:, wherein R represents hydrogen atom or a lower alkyl group and which exhibits an immunopotentiating activity. This new compound as well as its pharmaceutically acceptable salts and hydrates are useful for immunotherapy and treatment of immune diseases and disorders in living animals including human beings. The new compound can be produced by reduction of a hydroxyterophthalic acid alkyl ester or by esterification of the corresponding 3-hydroxy-4-(hydroxymethyl)benzoic adic.
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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 November 9, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 9, 1999.
- 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.