Heimd-containing polyetheramine curative for flexible, toughened products
CA 2086719 C · Owner: Renken, Terry L. · Inventors: Cuscurida, Michael; Waddill, Harold G.; Su, Wei-Yang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a novel polyetherdiamine comprising an aminated, alkoxylated 1-2'-hydroxyethyl-2-imidazolidone represented by the formula:, (see formula I) where R is H or an alkyl group of from 1 to 16 carbon atoms and a + b = n, wherein n is a number from about 2 to 80 and to its, use in epoxy resin curing systems to produce compositions having improved strength and flexibility properties compared with currently available polyoxyalkylenediamine curatives of equivalent weight.
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 January 5, 1993 and granted August 26, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 5, 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.