Method and apparatus for uniformly debossing and aperturing a resilient plastic web
CA 1187775 A · Owner: The Procter & Gamble Company · Inventors: Mullane, William I. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a method and apparatus for forming uniformly apertured, resilient plastic webs exhibiting fine-scale three-dimensional characteristics for fluid permeability. The uniformity of aperturing is controlled by the character of the forming surface on which the plastic material comprising the web is subjected to a fluid pressure differential. The forming surface is produced by superimposing and bonding a multiplicity of planar apertured sheets with coinciding apertures of dissimilar sizes, and then causing the uppermost surface to assume a radius of curvature greater than that of the lowermost surface. This avoid the use of support members which contact the webs during …
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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
- Granted May 28, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 28, 2002.
- 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.