Prepreg for high performance composite materials
CA 2039840 A1 · Owner: Basf Aktiengesellschaft · Inventors: Zwecker, Joachim; Folda, Thomas; Cramer, Edwin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
O.Z. 0050/41577, Abstract of the Disclosures Prepregs for high performance composite materials are based on oriented reinforcing fibers and a vinyl ester urethane resin comprising a reaction product of, A) a polyisocyanate with or without, B1) a polyalcohol or, B2) a polyamine and C) a hydroxyalkyl (meth)acrylate, and containing less than 2 % by weight of unsaturated monomers and in particular virtually no styrene.
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 April 15, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 2013.
- 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.