Capacitive sensor for measuring a liquid level and reservoir equipped therewith
CA 2292800 A1 · Owner: L'Air Liquide Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'Etude Et L'Exploitation Des Procedes Georges Claude · Inventors: Delatte, Daniel (Decede)
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a capacitive sensor for measuring a liquid level in a reservoir (1) comprising a body (7) for mounting the sensor and a first capacitor plate (8) borne by the body and designed to form with a second capacitor plate (41) a capacitor designed to be connected to potential difference source which capacitor plates are designed to be partially immersed in the liquid defining between them a space for receiving the liquid. The first capacitor plate (8) is mounted adjustable on the body between a high measuring position and a low measuring position. The invention is applicable to nitrogen storage in liquid/vapour equilibrium for preserving biological products.
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 April 1, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 1, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 1, 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.