Absorbent comprising upper and lower gel layers
CA 2196162 C · Owner: Litchholt, John Joseph · Inventors: Feist, Barry Robert; Bogdanski, Michael Scott; Sanchez, Liza Marie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an absorbent structure (1) having a first layer which forms a mixture of absorbent gelling material particles (5) fibers, a second , layer comprising liquid permeable substrate (7) and absorbent gelling , material particles (9) attached to said substrate thus forming a laminate. The weight of the absorbent gelling material particles (5) in the mixed layer is not more than 70 percent, preferably not more than 60 percent of the weight of the mixed layer. The combined weight of the absorbent gelling material particles attached to the substrate (7) and in the mixed layer (5) is at , least 80 percent preferably at least 140 percent of the weight of fibers in 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 July 13, 1995 and granted January 30, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 13, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 13, 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.