Measuring the speed of ultrasound in a moving web of paper
CA 1288858 C · Owner: Accuray Corporation · Inventors: Burk, Gary Neil
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides apparatus and methods for producing and communicating low-noise signals that when, combined with known distances between a first transducer and each of a plurality of second transducers enable measurement, of the speed of ultrasound in a moving web of paper. The invention employs a hollow cylinder having electronic circuitry in its interior. The first and second transducers are disposed in the cylinder and have portions which protrude above the surface of the cylinder for contact with the web. The first transducer receives electrical pulses and delivers corresponding ultrasonic pulses to the web that propagate through the web and are received by the second …
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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 September 10, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 10, 2008.
- 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.