Polyurethane fiber containing hydrotalcite
CA 2096834 C · Owner: Asahi Kasei Kogyo Kabushiki Kaisha · Inventors: Yoshizato, Akihiko; Kojima, Yoshiaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyurethane composition excellent in chlorine resistance containing 0.1 to 10% by weight based on the, polyurethane, of hydrotalcite which has water of crystallization and a C10-C30 fatty acid adhered thereto capable of being stably spun over a long period of time and exhibiting neither discoloration in the step of tannin solution treatment nor swelling during chlorine immersion treatment.
Read the whole patent
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 September 24, 1992 and granted November 30, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 24, 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
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.