Method and apparatus for forming a pulsed stream of particles for application to a fibrous web
CA 2203137 C · Owner: The Procter & Gamble Company · Inventors: Janson, John Paul; Fleming, James Michael; Stalford, Michael John
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 forming a pulsed stream of discrete particles of absorbent material. The apparatus comprises a particle metering apparatus (80) for providing a stream (82) of particles having a predetermined mass flow rate, an ejector having an acceleration air nozzle (130) for accelerating the stream of particles at least one , deceleration air nozzle (210) and valving (400) for alternately directing air through the acceleration and deceleration nozzles. The apparatus can be used to form a fibrous web having a predetermined variation in basis weight of absorbent material along the length of the web.
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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 October 30, 1995 and granted February 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 30, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 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
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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.