Soft stretch yarns and their method of production
CA 2310686 C · Owner: Maeda, Yuhei · Inventors: Maeda, Yuhei; Ochi, Takashi; Mochizuki, Katsuhiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A soft stretch yarn substantially comprising polyester fibres has a stress at 50% yarn stretch, of no more than 30 x 10-3 cN/dtex and at the same time, a percentage recovery of at least 60%. Preferably the Uster unevenness is no more than 2.0% and the crimp diameter is no more than 250 µm. This soft stretch yarn can be produced by spinning yarn of conjugate fibres comprising two types of polyester in which one component is PTT at a take-up velocity of at least 1200 m/min drawing at a drawing temperature of 50 to 80°C at a draw ratio such that the drawn yarn tensile elongation is 20 to 45% and then heat setting.
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 June 6, 2000 and granted November 22, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 6, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 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.