Recovery of pump-out waste in the melt spinning of thermoplastic filaments
CA 1193816 A · Owner: Du Pont Canada Inc. · Inventors: Dempster, David F.; Cura, Ivor G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is disclosed for recovering pump-out waste from a process in which filaments of thermoplastic polymer are melt spun through a spinneret into an air chimney. The method comprises the steps of: (a)intercepting the filaments in the air chimney with a metal deflector plate positioned at an angle of between 60 and 80 degrees to the vertical the, deflector plate being adapted to allow the filaments to form lumps of recoverable size and to permit the lumps to slide down the deflector plate out of the air chimney and (b)col-, lecting the resulting lumps of pump-out waste.
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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 September 24, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 24, 2002.
- 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.