Novel polyamines and a process for their preparation
CA 2203313 A1 · Owner: Wolf, Elmar · Inventors: Wolf, Elmar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a polyamine of the formula I: , (wherein n is 1, 2 or 3; R is a linear or branched alkylene cycloalkylene, (cyclo)alkylene or (phenylene)alkylene radical (1) which has 2 to 22 carbon atoms, (2) which may contain one to four C1-3 alkyl groups, (3) which may have one to three NH groups in place of CH2 groups and (4) which may have one oxygen atom in place of a CH2 group; and R1 is an alkyl cycloalkyl, aryl or alkylaryl radical having 4 to 24 carbon atoms when n is 1, or a linear or branched saturated aliphatic hydrocarbon, saturated (cyclo)aliphatic hydrocarbon or saturated aliphatic-aromatic hydrocarbon radical having 4 to 24 carbon atoms when n is 2 or 3, each of which may have …
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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 April 22, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 22, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 2019.
- 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.