Polyamines containing ester and amide groups, a process for their preparation, and their use
CA 2206550 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 are polyamine compounds of the formula: (I), (wherein: R is a C4-C18 hydrocarbon radical which may have O atom, a further C1-C4 alkyl group; R1 R2, R3 and, R4 are each H or a C1-C20 alkyl radical which may have O atom; each X represents N or O, provided that at least one is N; and n is 1 or 2). The polyamines are useful as a reaction component of two-component polyurethane adhesives.
Read the whole patent
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 29, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 29, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 29, 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.