Method and apparatus for determining the fiber orientation of paper
CA 2116265 C · Owner: Abe, Yuji · Inventors: Fukuoka, Kazuhiko; Hatano, Akio; Abe, Yuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are a method and apparatus for rapidly and accurately determining fiber orientation of stationary or moving paper in a paper machine useful for grade study and quality control of the paper. A projector projects an unpolarized light beam perpendicularly to a surface of the paper to be tested, then a light beam reflected by the paper surface is caught by eight or more light receivers distributed on a circumference of a circle defined on the, incident side of the unpolarized light beam in a plane, extending in parallel to the paper surface around a point at which the above-mentioned parallel plane intersects an axis of the incident light beam, and a light information signals output …
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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 February 23, 1994 and granted June 22, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 23, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 23, 2016.
- 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.