Fiber spinning process and product thereof
CA 2106482 C · Owner: Cosentino, Louis C. · Inventors: Hall, Robert T.; Pigott, Daniel T.; Cosentino, Louis C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A significant increase in the rate of production of high quality symmetrical microporous hollow fibers can be obtained by a selection of raw materials, equipment and processing conditions. In particular selection of polymer concentrates, precipitating solutions and fiber die dimensions are important to attaining production speeds greater than 30 meters per minute. In the processes, a polymer dope solution (12) is filtered through a filter press (16) and delivered to a dry-jet wet spinning spinneret apparatus (20) along with a precipitating solution (22). The solutions (12 22) are spun from the spinneret apparatus (20) to form a hollow fiber which is quenched and wound on a take-up wheel …
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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 March 30, 1992 and granted July 22, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2014.
- 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.