Continuous processes for making composite fibers
CA 2586635 C · Owner: E.I. Du Pont De Nemours And Company · Inventors: Chitrangad, Bhatnagar; Hartzler, Jon David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to continuous processes for making composite fibers from aramid polymers. The process includes : continously combining an anisotropic polymer solution of an aramid polymer and an isotropic solution of a second polymer to form a combined polymer solution ; passing the combined polymer solution through at least one static mixer to form a spin dope ; and extruding the spin dope through a spinneret to form a composite fiber. The process prduce fibers that are useful in a variety of applications including , reinforcing elastomeric materials.
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
- Filed November 30, 2005 and granted May 22, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.