A method for making spunbond nonwoven fabric from multiple component filaments
CA 2458719 A1 · Owner: Davis, Michael C. · Inventors: Davis, Michael C.; Bansal, Vishal; Van Trump, James E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for preparing multiple component spunbond nonwoven fabrics in which the individual polymer components are extruded from separate orifices and contacted and fused after extrusion to form multiple component filaments that are drawn, quenched, and collected to form a spunbond web. The method is especially suitable for forming multiple component spunbond webs in which the different polymeric components have significantly different viscosities for , example in forming nonwoven webs comprising multiple component filaments having three-dimensional helical crimp.
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 September 25, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 25, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 2024.
- 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.