Absorbent articles having improved surfactant-treated hydrophilic topsheets
CA 2216144 C · Owner: Lee, Yann-Per · Inventors: Lee, Yann-Per; Lloyd, Susan Nicole
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides an absorbent article having a topsheet treated with a silicone-based surfactant to impart hydrophilicity. The absorbent article preferably includes a first, apertured macroscopically expanded, three-dimensional polymeric topsheet and preferably includes a second apertured, macroscopically expanded, three-dimensional polymeric topsheet underlying the first topsheet. The multiple topsheets provide improved masking of bodily fluids absorbed and retained by the absorbent core. The first and second topsheets preferably include surfactants which impart hydrophilicity to differing degrees, and which preferably are selected from diverse surfactant categories. …
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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 March 20, 1996 and granted October 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 20, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 20, 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.