A method for selectively aperturing a nonwoven web exhibiting surface energy gradients
CA 2233477 C · Owner: Cree, James William · Inventors: Benson, Douglas Herrin; Curro, John Joseph; Ravaglia, Luis Eduardo Ferraz Do Amaral
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention pertains, in a preferred embodiment to a method for , selectively aperturing a nonwoven web (22) exhibiting a plurality of surface energy gradients. The method includes the steps of: providing a nonwoven web (22) of fibers exhibiting a surface energy the nonwoven web (22) having a , first surface (61) a second surface (62) and a plurality of fluid passageways placing the first (61) and second (62) surfaces in fluid communication with one another; applying a surface treatment to the first surface (61) of the nonwoven web (22), the surface treatment having a surface energy less than the surface energy of the fibers of the nonwoven web (22) creating a plurality of …
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 12, 1996 and granted January 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 12, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 12, 2018.
- 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.