Process for forming microporous sheet
CA 1062414 A · Owner: Usm Corporation · Inventors: Hollick, John G.; Day, John T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for forming a microporous polyurethane body in which process a body of an emulsion is prepared of which the discontinuous phase is a nonsolvent liquid and the continuous phase is a liquid polymeric material which sets through reaction to solid condition the liquid emulsion is formed as a layer and reacted under conditions preserving the uniformity of emulsion to form a resilient gel structure and the layer is subjected to physical pressure to express a substantial portion of the non-solvent liquid from the layer leaving a fine microporous structure after release of the pressure. The reaction is continued to advance the state of cure and any remaining non-solvent liquid is removed …
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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 September 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 18, 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.