Sanitary articles with multi aperture size film topsheets having a selected distribution of the apertures
CA 2230838 C · Owner: Hirsch, Uwe Thomas Michael Horst · Inventors: Hirsch, Uwe Thomas Michael Horst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to absorbent articles particularly sanitary napkins preferably having film topsheets. In particular a topsheet receiving the liquids to be absorbed comprises apertures of at least 4 different sizes which are distributed according to their respective size in longitudinal and transverse directions. This range of aperture sizes provides exceptionally good liquid intake performance for the range of liquid viscosities commonly found for liquids which are absorbed in sanitary napkins. The distribution of the apertures leaves a certain longitudinal side edge and preferably transverse end edge of the topsheet free of the larger apertures to improve comfort of …
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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 August 30, 1996 and granted December 18, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 30, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 30, 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.