Polyisocyanate foam having isotropic cells and method and apparatus therefor
CA 1048699 A · Owner: Nihon Soflan Chemical And Engineering Co. Ltd. · Inventors: Miyagaki, Ryoichi; Nakamura, Kuniyasu; Komada, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyisocyanate foam having isotropic cells is manufactured by foaming operation in an apparatus comprising a mould composed of side walls capable of extending and retrenching or folding and unfolding perpendicularly to free rising direction a detecting means, if desired, and a mould extending means provided on the respective side wall which operates to spread out the mould perpendicularly to free rising direction. Foaming in the free rising direction proceeds in a creamy state up to the position of the means in the unopened mould and then foaming, perpendicularly to free rising direction continues during a period of time from a creamy state to a tack-free state while the mould is …
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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 13, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 13, 1996.
- 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.