Method for manufacturing polyurethane foam
CA 1280548 C · Owner: Suetsugu, Katsuyoshi · Inventors: Sasaki, Kazuki; Toyama, Yasunori; Takao, Shoji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for manufacturing polyurethane foam by mixing (a) polyisocyanate, (b) polyol, (c) blowing agent (d) catalyst and, as required (e) surface active agent filler, or other such additive, the said method being characterized in that the polyisocyanate (a) is a prepolymer with isocyanate end groups produced from a polyester polyol and a blended polyisocyanate component comprising 45-95 weight % of diphenylmethane diisocyanate and 55-5 weight % of a polymethylene polyphenyl polyisocyanate with a functionality of 3 or more.
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
- Granted February 19, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 19, 2008.
- 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.