Surface sensor
CA 1078489 A · Owner: Domtar Limited · Inventors: Lucas, John M.; Gracovetsky, Serge
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for continuously indicating the topographical profile of the surface of a travelling paper web is provided by using a light source directed perpendicularly to the surface to illuminate areas on the surface no greater than about 1 mm in diameter. Non-specular light reflected from the surface is detected by a pair of detectors arranged around the illuminated-area thereby to generate a pair of signals. These signals are electrically processed by subtracting one from the other to obtain an indication of the slopes of the surface in the instantaneously illuminated areas thereby to obtain continuous indication of the topographical profile of the surface while substantially reducing 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
- Granted May 27, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 27, 1997.
- 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.