Polyurethane and elastic fiber obtained therefrom
CA 2445685 A1 · Owner: Fujie, Tsutomu · Inventors: Ishimaru, Futoshi; Masui, Takashi; Fujie, Tsutomu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The polyurethane of the present invention comprises a high molecular weight polyol, an organic polyisocyanate, and a low molecular weight polyol and has , a crosslinked, structure. The bonds forming the crosslinked points in the polyurethane comprise urethaee, bonds formed by the reaction of aromatic hydroxyl groups and aliphatic isocyaoato groups, and/or urethane bonds formed by the reaction of aromatic hydroxyl groups and benzylic, iaocyanato groups, being 0.1 to 54% of the total urethane bonds. The polyurethane of the, present invention is superior in elastic recovery and the urethane bonds of , the crosslinked points reversibly dissociate end bond beyond a certain temperature. …
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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
- Filed April 4, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 4, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 4, 2022.
- 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.