Process for producing a surfactant treated, formed, polymeric web
CA 2183236 C · Owner: The Procter & Gamble Company · Inventors: Koger, Thurman John, Iii; Wnuk, Andrew Julian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coextruded, multilayer, polymeric film having a core layer including a surfactant and at least, one outer layer is placed on a forming structure. The forming structure moves in a direction parallel to the direction of travel of the multilayer film and carries the multilayer film in that direction. A fluid pressure differential is applied across the thickness of the multilayer film along the direction of movement of the forming structure. The fluid pressure differential is sufficiently great to cause the multilayer film to conform with, the forming structure forming a formed polymeric web. The formed polymeric, web is exposed to a temperature which is sufficiently great enough to allow the …
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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 February 23, 1995 and granted August 3, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 23, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 23, 2017.
- 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.