Apparatus and method for detecting the level of a liquid
CA 2335531 A1 · Owner: Casco Products Corporation · Inventors: Jones, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Light from a light source (2) is conducted through a light conducting element (4) which is partially submerged in a liquid (12). Light escaping from the light conducting element (4) is scattered by the meniscus (14) of the liquid and the scattered light is collected by a lens (6) and focused to form an image at a detector (8). The meniscus appears as a bright band in the image formed at the detector (8) and the position of the band in the image is used to determine the level of the liquid.
Read the whole patent
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 May 11, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 11, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 11, 2021.
- 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.