High-strength polyester yarn and process for its preparation
CA 1300360 C · Owner: Hoechst Aktiengesellschaft · Inventors: Thaler, Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a high-strength polyester yarn having a heat shrinkage at 200°C of less than 7X a, degree of elasticity ED20 of at least 90% a stability, quotient SQ of at least 7.5 and a crystallinity of about 57 to 65%. Such yarns can be obtained by high-speed pinning of filaments which have at least a birefringence of 0.025 and an average molecular weight corresponding to a relative viscosity of 1.9 to 2.2 and are subjected to a stretching at high temperatures using a stretch ratio of at least 90X of the maximum cold stretch ratio and a stretching tension between 19 and 23 cN/tex.
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
- Granted May 12, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 12, 2009.
- 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.