Antiherpes tetrapeptide derivatives having a cycloalkyl substituted aspartic acid side chain
CA 2019006 C · Owner: Boehringer Ingelheim (Canada) Ltd./ Boehringer Ingelheim (Canada) Ltee · Inventors: Deziel, Robert; Moss, Neil
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein are tetrapeptide derivatives of the formula X-NH-CHR1-C(W1)-NR2-CHCH2C(O)-Y-C(W2)-NH-CHCR3(R5)- COON-C(W3)-NH-CHR5-Z wherein X is a terminal group for, example, alkanoyl or phenylalkanoyl radicals R1 and R5 are selected, from amino acid or derived amino acid residues R2 is hydrogen, alkyl or phenylalkyl, R3 and R4 are joined to form a cycloalkyl W1, W2 and W3 are oxo or thioxo, Y is, for example an alkoxy or a, monosubstituted or disubstituted amino and Z is a terminal unit, for, example hydrogen, COON or CH2OH. The derivatives are useful for treating herpes infections.
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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 June 14, 1990 and granted June 13, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 14, 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.
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Sources & verification
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.