Process for producing flexible polyurethane foam
CA 2406114 A1 · Owner: Asahi Glass Company, Limited · Inventors: Wada, Hiroshi; Sugiyama, Kayoko; Takeyasu, Hiromitsu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing a flexible polyurethane foam satisfying low resilience, high vibration absorption, and high durability. A mixture comprising 95 to 50 wt.% polyoxyalkylene polyol produced with an alkali metal catalyst and 5 to 50 wt.% polyoxyalkylene polyol produced with a composite metal cyanide complex catalyst is reacted with a polyisocyanate compound in the presence of a catalyst and a foaming agent to produce a flexible polyurethane foam which has a resonance frequency of 3.7 Hz or lower a , resonance ratio of 3.5 or lower, and a resilience of 70% or lower.
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 12, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 12, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 2023.
- 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.