Process for producing a smooth polyester yarn and polyester yarn produced by said process
CA 1292602 C · Owner: Schaffner, Paul · Inventors: Specker, Hugo; Schaffner, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A C T, "PROCESS FOR PRODUCING A SMOOTH POLYESTER YARN AND POLYESTER YARN PRODUCED BY SAID PROCESS" In a process for producing a smoothy, low-shrinkage polyester filament yarn, the starting point is high-speed spun POY. The polyester POY is cold-drawn and then subjected to a hot relaxation under an overfeed of 10 to 20% at 140 to 250°C in a dry medium or at 70 to 140°C in a wet medium and if desired intermingled. The result is a yarn having an initial modulus of 200 to 800 cN/tex and a boil shrinkage of less than 3%. The yarn is suitable for use as a replacement material for cellulose acetate.
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 December 3, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 3, 2008.
- 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.