Complex salts of hematoporphyrin and of its derivatives, their synthesis and therapeutic agent
CA 2081605 C · Owner: "Napta"S.A. · Inventors: Graczyk, Alfreda; Konarski, Jerzy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
New complex salts of hematoporphyrin and of its derivatives have general formula 1, in which R1 and R2 are identical or different and denote the -CH=CH2, -CH/OH/-CH3 or CH/OR3/-CH3 groups, where R3 represents the group forming the oligomer contwining ethereal and/or ester bindings this group comprising, from 1 to 5 identical or different units derived from monomer of formula 2 or R1 and R2 are identical and denote the CH/R4/-CH3 group, where R4 represents the groups: carboxymethylamino 1-carboxypenthylamino, 1-carboxy-2-methylpropylamino 1-carboxy-, -3-methyl-butylamino, 1-carboxy-2-methyl-butylamino 1-carboxy-, butylamino, 1-carboxypentylamino 1-carboxy-2-hydroxyethylamino, …
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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 October 28, 1992 and granted February 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2014.
- 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.