Oxidant sensitive and insensitive aromatic esters as inhibitors or human neutrophil elastase
CA 2042904 A1 · Owner: Kirschenheuter, Gary P. · Inventors: Kirschenheuter, Gary P.; Spruce, Lyle W.; Cheronis, John C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to 2-phenylalkanoate esters of the formula:, and non-toxic pharmaceutically acceptable salts thereof wherein R1 and R2, which may be the same or different are, selected from the group consisting of hydrogen alkyl of 1 to 6, carbons, cycloalkyl of 3 to 6 carbons or together represent a methylene group -(CH2)n- where n is a whole number of from 1 to 6; and R3 and R4 are variously defined. The esters are useful as inhibitors of human leukocyte elastase and may be used in the treatment of acute respiratory syndrome myocardial infarc-, tion or periodontal disease.
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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 17, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2013.
- 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.