Water level indicator
CA 2172895 C · Owner: Douthwright, Thomas Roy · Inventors: Douthwright, Thomas Roy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A water well bored into the earth, the well having a well casing extending below a water level to the bottom of the well is provided in combination with a, continuous water level indicator. Such continuous water level indicator includes a float which is adapted to float, as well as to rise and fall unhindered as the level of the water in the well rises and falls. A tube extends outwardly adjacent the top of the well from the well to the interior of a dwelling. An indicator is provided which includes a dial and a spring-loaded pointer which is movable to different indicia on the dial of the indicator. A pulley is provided at the junction of the well casing and the tube. A lightweight …
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 March 28, 1996 and granted February 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 2018.
- 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.