Method of preparing rigid polyurethane foam and composition for rigid polyurethane foam
CA 2303699 A1 · Owner: Matsumoto, Takuya · Inventors: Ono, Keiji; Chiba, Takanori; Matsumoto, Takuya
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of preparing a rigid polyurethane foam having improved thermal conductivity, and a composition for such rigid polyurethane foam is provided. In the, preparation a rigid polyurethane foam from a composition comprising an aromatic, polyisocyanate, a polyol, a blowing agent a catalyst, a surfactant and other , aids the, blowing agent is a blend of cyclopentane and water and the polyol contains a , polyether, polyol prepared by addition-polymerizing an alkylene oxide to o-toluenediamine as an, initiator.
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 4, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 4, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 4, 2022.
- 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.