Process for producing acrylic composite fibers having woolly crimp characteristics
CA 1045321 A · Owner: Japan Exlan Company Limited · Inventors: Kusunose, Takamaro; Okazaki, Takeshi; Sumi, Takehiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing acrylic composite fibers having woolly crimp characteristics by compositely wet-spinning two kinds of acrylonitrilic polymers each of which contains not less than 88% by weight acrylonitrile and which are different from each other in acrylonitrile content by not less than 0.5%, initially heat relaxing the obtained swollen gelly fibers containing at least 40% water in hot water or steam in a non-tensioned state without drying them so as to form them into composite fibers in which the irreversible swelling degree of the component higher in acrylonitrile content is higher than that of the other component by not less than 0.05 and said component higher in irreversible …
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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 January 2, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 2, 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.