Heat curable, expandable one-component polyurethane composition
CA 2107427 A1 · Owner: Meckel, Walter · Inventors: Meckel, Walter; Liman, Ulrich; Werner, Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Heat curable expandable one-component polyurethane, compositions are described. These compositions comprise a) an isocyanate prepolymer which is flowable at room temperature, and is obtained by the reaction of an organic polyisocyanate with a polyhydroxyl compound; b) a solid, finely divided polyhydroxyl compound which has an average at least two hydroxyl groups per molecule, is insoluble in the prepolymer phase a) and is finely distributed in the prepolymer phase a); and, c) a solid, finely divided blowing agent which is finely distributed in the prepolymer phase a); with the proviso that the decomposition temperature of the blowing agent c) is not significantly above the curing …
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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 September 30, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 30, 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.