Production process for producing a polyurethane elastic material and elastic yarn.
CA 2285396 A1 · Owner: Nisshinbo Industries Inc. · Inventors: Yoshimoto, Mitsuhiko; Tsutsumi, Nobuhisa; Tamura, Kenji
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 polyurethane elastomer or elastic filament wherein , a first polymer diol of a molecular weight of at least 600 a second polymer , diol of a molecular weight of at least 600 a first low-molecular weight diol , having a molecular weight of not higher than 500 a second low-molecular , weight diol, a first diisocyanate and a second diisocyanate are used as the main starting materials, and the molar ratio of the total of the first diisocyanate and the second diisocyanate in the starting materials to the total of the first polymer diol, the second polymer diol the first low-, molecular weight diol and the second low-molecular diol is 0.95/1 to 1.25/1 characterized in …
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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 January 30, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 30, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 30, 2020.
- 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.