Hardener for epoxy resins
CA 2089532 A1 · Owner: Marten, Manfred · Inventors: Godau, Claus; Marten, Manfred; Stengel-Rutkowski, Bernhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the disclosure:, Hardeners for epoxy resins comprising reaction products, of, (A) polyamidoamines that were obtained by polycondensation of (a) dicarboxylic acids containing oxyalkylene groups, or their derivatives with (b), polyamines containing at least two amino groups capable of undergoing condensation with (a) (B) polyamines containing at least two secondary amino groups, and, (C) adducts of (c) polyepoxy compounds and (d) polyalkylene polyether polyols. Epoxy resins that have been cured with these hardeners exhibit in particular a very good water resistance.
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 February 15, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 2015.
- 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.