Aramid fibrils
CA 2548741 C · Owner: Hendriks, Anton Johannes Josef · Inventors: Journee, Rene; Oldenzeel, Mirjam Ellen; Tiecken, Jan Davis Cornelis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to aramid fibrils having in the wet phase a Canadian Standard Freeness (CSF) value less than 100 ml after drying a specific , surface area (SSA) less than 7 m2/g and a weight weighted length for , particles having a length > 250 ~m (WL 0.25) less than 1.2 mm and to a method , of preparing the fibrils comprising the steps a. polymerizing an aromatic diamine and an aromatic dicarboxylic acid halide to an aramid polymer in a , mixture of N-methylpyrrolidone or dimethyl- acetamide and calcium chloride or lithium chloride to obtain a dope wherein the polymer is dissolved in the mixture and the polymer concentration is 2 to 6 wt. % b. converting the dope , to fibrils by …
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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 November 30, 2004 and granted January 24, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2024.
- 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.