Preparation of flexible polyurethane foams
CA 2370308 A1 · Owner: Baum, Lothar · Inventors: Baum, Lothar; Schroeder, Heinz-Jurgen; Falke, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Flexible polyurethane foams are prepared by reacting organic and/or modified organic polyisocyanates (a) with a polyetherol mixture (b) and, if required, further compounds (c) having hydrogen atoms reactive toward isocyanates in the presence of, water and/or other blowing agents (d) catalysts (e) and, if, required, further assistants and additives (f) by a process in, which the polyetherol mixture (b) consists of b1) at least one polyetherol which is at least difunctional has, an OH number of from 20 to 100 mg KOH/g and is based on propylene oxide and/or butylene oxide and ethylene oxide having an ethylene oxide content of more than 40% by weight based on the total amount of alkylene oxide …
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 February 4, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 4, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 4, 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.