Porphyrin derivatives
CA 1315780 C · Owner: Fukuda, Yozo · Inventors: Yamada, Haruo; Karasawa, Michito; Fukuda, Yozo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Porphyrin derivatives, Novel porphyrin derivatives of -the general formula: wherein R1 each independently denotes a hydrogen a C1-C4, alkyl group or an ethenyl group and R2 each independently, denotes COZ(CmH2m)Q COZCH(CmH2mQ)2, -CH2-Q wherein Z, is O S or NH, m is an interger of 1 to 23, and Q is a di-(C1-C4 alkyl)amino group or tri-(C1-C4 alkyl)ammonium halide group or , (wherein X is a halogen); or R1 each independently denotes -C2H4-Q (wherein Q is the same as defined above), -C2H4- , or , (wherein X is the same as defined above) and R2 each inde-, pendently denotes a carboxyl group or a C1-C4 alkoxycarbonyl group, and the production thereof are described. The quaternary ammonium salt …
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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 April 6, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 6, 2010.
- 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.