Peptide compound and a process for the preparation thereof
CA 2068478 A1 · Owner: Sakai, Hiroyoshi · Inventors: Sakai, Hiroyoshi; Ishikawa, Takatoshi; Tanaka, Akito
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The disclosure describes peptide compounds of the formula:, R2, wherein R1 is aryl which may have one or more suitable substituent(s), R2 is carboxy(lower)alkyl or protected carboxy(lower)alkyl, R3 is carboxy or protected carboxy A1 is alkylene which may have one or more suitable substituent(s), A2 is a group of the formula: R4, -N-CH2CO-, (wherein R is lower alkyl) or a group of the formula:, -NHCH2CH2CO- A3 is lower alkylene which may have one or more suitable substituent(s), ?, m and n are each the same or different and represent an integer of 0 or 1, with proviso that A2 is not a group of the formula: -NHCH2CH2CO- , when ? is an integer of 0 or a pharmaceutically acceptable 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
- Filed May 12, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 12, 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
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.