Filaments, tow, and webs formed by hydraulic spinning and having delayed wettability
CA 2082445 A1 · Owner: Anderson, Richard A. · Inventors: Anderson, Richard A.; Macdonald, John G.; Nohr, Ronald S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of forming substantially continuous filaments having delayed wettability, in that the filaments are not wettable by water upon their formation but become wettable within from about three hours to about 30 days thereafter without any post-formation treatment, which method involves the steps of (1) ? melting a mixture consisting of a thermoplastic polyolefin an additive, and a, retardant coadditive; (2) extruding the resulting molten mixture through a die (3) contacting the filaments with a quenching fluid; (4) entraining and drawing the filaments in a nozzle with an attenuating liquid having a defined linear speed; and (5) collecting the drawn filaments. The additive is a defined …
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 9, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 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.