Novel quaternary ammonium salts and use thereof as medicine
CA 2134229 A1 · Owner: Zeria Pharmaceutical Co. Ltd. · Inventors: Kitagawa, Osamu; Ueki, Sigeru; Seiki, Masao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Quaternary ammonium salts represented by the following formula (I):, (I), wherein R1 and R2 represent lower alkyl groups which may be the same or different from each other; R3 represents hydrogen, lower alkyl, phenyl, benzyl, or -COOR4 (wherein R4 represents lower alkyl), A represents lower alkyl lower, alkenyl, lower alkynyl, -(CH2)p-COOR5 (wherein R5 represents hydrogen or lower alkyl, and p represents an integer of from 1 to 5), or , (wherein, R6 represents hydrogen hydroxyl, nitro, lower alkyl, -COOR5, or -SO3R5); Q- represents a counter anion of quaternary ammonium salt; X represents , , or , ;, Y represents methylene, oxygen or sulfur; Z represents , , , , , , or , (wherein R7 and R8 …
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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
- Filed May 10, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 10, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 10, 2015.
- 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
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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.