Volume sensor for paddle elevator using laser light
CA 2255166 C · Owner: Harden, Philip Alan · Inventors: Mahin-Fallah, Ahmad; Skarie, Christopher Jason; Harden, Philip Alan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A laser sensor for detecting the volume of particulate material being conveyed by a, paddle conveyor. The sensor comprises two opposed units a master unit and a , slave unit. Each unit is provided with a single laser emitting diode and four photo detectors. The master, unit is provided with a microprocessor for providing a square wave laser firing signal to the, lasers. The slave unit is provided with an inverter for inverting the laser firing signal from, the microprocessor. The lasers are fired sequentially when they receive a high pulse from, the square wave emitted from the microprocessor. The photo detectors transmit their laser, light detection signal when they receive a low …
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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 December 16, 1998 and granted October 9, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 16, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 16, 2020.
- 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.