Flexible ignition resistant biregional fiber, articles made from biregional fibers, and method of manufacture
CA 2189352 C · Owner: Mccullough, Francis P. · Inventors: Mccullough, Francis P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A flexible, ignition resistant, biregional fiber is disclosed, wherein the fiber is preferably derived from a single homogeneous polymeric precursor composition said bire-, gional fiber comprising an inner core region of a thermoplastic polymeric composition and a surrounding outer sheath region of a thermoset carbonaceous material. The biregional fiber is particularly characterized by having a ratio of the radius of the core region with respect to the total radius of the fiber (r.R) of from about 1:4 to about 1:1.05, an LOI value of greater than 40, a breaking twist angle of from 4 to 13 degrees and a, bending strain value of from greater than 0.01 to less than 50 %. In a further …
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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 April 25, 1996 and granted October 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 25, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 25, 2018.
- 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.