Surface treated aramid fibers and a process for making them
CA 2105091 C · Owner: E. I. Du Pont De Nemours And Company · Inventors: Rebouillat, Serge
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to highly processable hydrophobic aramid fibers of high , modulus improved surface frictional pro-, perties scourability, low abrasion depositing, low fibrillation obtainable by surface reaction of an aromatic polyamide fiber with a surface reactant comprising a ketene dimer (1):R1R2C2OR1R2C2O. The invention further relates to a process for the production and the use of said fibers.
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 March 2, 1992 and granted October 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 2, 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.