Gauge for measuring liquid levels
CA 2265782 C · Owner: Vista Leak Detection, Inc. · Inventors: Maresca, Joseph W. Jr.; Burns, Alan A.; Eckert, Eric G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for measuring liquid level in a container. A flexible measurement scale (12), attached at one end (16) to a weight (14) for retainment at the bottom (18) of a container (20), and at the opposite end (22) to a receiver (26) at the top of the container (20). Float (32) has a configuration and density to place a portion (44) of the float (32) below the level (46) of the liquid and a portion (48) above the liquid level (46). Portion (48) above the liquid level (46), contains transmitter for applying energy to one side of the scale (12), and detectors for detecting energy transmitted through the scale (12) and converting it to a signal indicative of a particular code on the …
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 September 19, 1997 and granted June 11, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 19, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 19, 2019.
- 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.