Carboxyalkyl dipeptide inhibitors of endopeptidases
CA 2069312 A1 · Owner: Neustadt, Bernard R. · Inventors: Haslanger, Martin F.; Smith, Elizabeth M.; Neustadt, Bernard R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Carboxyalkyl dipeptide inhibitors of endopeptidases of formula (I) or pharmaceutically acceptable salt thereof wherein R1 is H, alkyl, arylalkyl or aryl; R2 is H alkyl, alkenyl or alkynyl, wherein the alkyl portion is substituted with 0-3 substituents independently selected from the group consisting of hydroxy alkoxy, alkoxyalkoxy, alkylthio, aryl, alkoxyalkylthio arylalkoxy and , arylalkylthio; R3 and R4 are independently alkyl or arylalkyl; or R3 and R4 together with the carbon to which they are attached form an optionally substituted 5- 6- or 7-membered ring, wherein said ring comprises 0 to 1 heteroatoms selected from the group consisting of sulfur and oxygen; R5 is H alkyl, …
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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 10, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 2012.
- 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.