Method and spinning apparatus having a multiple-temperature control arrangement therein
CA 2278287 C · Owner: Johnstone, Robert Carter · Inventors: Boger, Robert Carl; Mccabe, Duncan Douglas; Johnstone, Robert Carter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for spinning filaments of a polymeric material includes a first temperature control arrangement (96) for heating a spin pack (24) to a first predetermined reference temperature greater than the predetermined polymer inlet temperature such that the temperature across a polymer filter holder (30) and the spinneret plate (36) in the spin pack (24) is substantially uniform, whereby the temperature of the filaments emanating from the spinneret plate is substantially uniform. A plate assembly (56) having at least one polymer flow passage therein is disposed between the outlet of the pump and the inlet of the spin pack. A second temperature control arrangement (100) …
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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
- Filed January 29, 1998 and granted August 27, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 29, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 29, 2020.
- 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.