Cardable hydrophobic polypropylene fiber
CA 2069269 C · Owner: Hercules Incorporated · Inventors: Johnson, Roger W.; Theyson, Thomas W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for treating the surface of hydrophobic polyolefin-containing fibers to improve their lubricity and antistatic properties comprises applying a liquid lubricating finish to the surface of an extruded polyolefin-containing fiber or filament in which the finish is either (1) a polyol (2) a water-soluble, ester or polyester obtained by reacting the polyol with a fatty acid having up to 6 carbon atoms, or (3) a glycol obtained by reacting the polyol with ethylene oxide or a combination of ethylene oxide and propylene oxide, and then mechanically processing the fiber or filament, the finish providing lubricity for the processing operations and lacking sufficient lipophilic substituents …
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 May 22, 1992 and granted September 15, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 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.