Apparatus for monitoring settlement of a solid in a liquid, and a system incorporating same
CA 2001913 C · Owner: James, David Francis · Inventors: James, David Francis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an automatic apparatus computer, controlled, for monitoring the settlement of solids in a liquid specifically sludge in effluent from a sewage treatment plant. The apparatus enables the determination of the parameter known as the Stirred Specific Volume Index (SSVI) of the sludge. The apparatus includes a standard cylindrical vessel for receiving the sludge and opposed banks of LEDs and sensors which monitor the settlement height of the sludge as it settles in the liquid. Stirring is effected by an eccentric stirrer controlled by a Hall Effect device and the output from the sensor is fed to an electronic circuit fed by a computer for providing a determination of …
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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 October 31, 1989 and granted March 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2011.
- 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.