Method and apparatus for making absorbent structures having divided particulate zones
CA 2240145 C · Owner: The Procter & Gamble Company · Inventors: Bogdanski, Michael Scott
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a method and apparatus for making absorbent structures having a layer of discrete particulate absorbent material which is divided into two or more bands (9) separated by a substantially particulate-free zone (11). The method of making such absorbent structures comprises the steps of first generating an initial particle suspension comprising a two-phase fluid of particles of absorbent gelling material suspended in a gas (such as air) flowing in an inlet duct. The initial particle suspension is then divided into multiple final particle suspensions in corresponding multiple branch ducts each of the final , particle suspensions having a given percentage 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 December 9, 1996 and granted November 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 9, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 9, 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.