Vinyl alcohol unit-containing polymer fibers having high moisture absorption and high water absorption and process for producing same
CA 2076283 C · Owner: Tsuda, Tomoyasu · Inventors: Tsuda, Tomoyasu; Kawamoto, Masao; Tanaka, Kazuhiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fibers composed of a vinyl alcohol unit-containing polymer, or composite fibers, yarns or fiber products composed of the phase of the vinyl alcohol unit-containing polymer and the other fiber-forming polymer phase are acetalized with at least one of aldehyde compounds represented by the formulas OHC-CH2-C(R1)(R2)-COOB and, OHC-C(R3)(R4)-COOB wherein B is a hydrogen atom or an alkyl group R1, R2, R3 and R4, independently from each other, denote a hydrogen atom or an alkyl group, and at least one of R1 and R2 and at least one of R3 and R4 are alkyl groups and a carboxyl group is then converted into a salt to form fibers, yarns or fiber products having high moisture absorption and high water …
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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 August 18, 1992 and granted June 25, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 18, 2014.
- 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
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.