Method and an apparatus for the production of highly oriented amorphous polyester filament yarns
CA 1332263 C · Owner: Rhone-Poulenc Viscosuisse Sa · Inventors: Fischer, Klaus; Baris, Halim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a process for the production of melt spun highly oriented amorphous polyester filament yarns (2) the, shock cooling is effected by means of a rotating cooling surface. In a preferred apparatus, the cooling surface is formed by the contact surface of a cooling roller (3). By variations of the contact time of the filament yarns (2) with the cooling roller (3) or of the distance between the spinneret (1) and the cooling roller (3) filament yarns can be produced with a desired boiling shrinkage of up to 70% with a simultaneous birefringence of > 0.08.
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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 October 11, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 11, 2011.
- 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
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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.