Methods and apparatus for selective placement of fibrous material in formed fibrous articles
CA 2017453 C · Owner: Fung, Paul · Inventors: Weir, Theodore; Bergquist, Roger; Schroeder, Manfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus and methods for forming improved airlaid fibrous articles are disclosed. Airlaying apparatus is provided which permits at least two types of fibrous materials to be defiberized and transported to a single airlaying apparatus. In a most preferred embodiment, a drum-type airlaying drum having a plurality of deposition cavities is provided. By controlling the airflow and pressure differential, selective placement of each type of fibrous material within a cavity is achieved. Also disclosed are improved deposition cavities which permit multiple materials to be airlaid and retained in position by providing a foraminous surface on at least a portion of the cavity sidewall. Most …
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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 May 24, 1990 and granted July 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 24, 2012.
- 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.