Two-ply polyurethane/geotextile composite and process for preparing the same
CA 2440880 A1 · Owner: Markusch, Peter H. · Inventors: Guether, Ralf; Markusch, Peter H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Two-ply polyurethane geotextile composites suitable for lining ditches and canals in which a rigid, dimensionally stable geotextile is bonded to a soft pliable geotextile with a solidifiable liquid polyurethane composition which is a reaction product of a mixture of a liquid polyisocyanate having an NCO content of at least 10% by weight, an isocyanate-reactive component which includes at least one high molecular weight polyether polyol and a urethane catalyst are made, preferably at the site where the composite will be used.
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 March 7, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 7, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 2024.
- 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.