A method for selectively aperturing a nonwoven web
CA 2233236 C · Owner: The Procter & Gamble Company · Inventors: Benson, Douglas Herrin; Curro, John Joseph
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a method for selectively aperturing a nonwoven web (102). A nonwoven web (102) is weakened along a plurality of locations and then a tensioning force is applied to the nonweven web (102) causing the nonwoven web (102) to rupture at the plurality of weakened location creating a plurality of apertures in the nonwoven web (102) coincident with the weakened locations.
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 November 4, 2003. 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.