Oil level control system
CA 2040391 C · Owner: Ac & R Components, Inc. · Inventors: Barbier, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An oil level sensor device for sensing and controlling the level of oil in the crankcases of refrigeration compressors each, compressor having a crankcase with a housing for oil that accumulates during the compression operation and each housing having an opening with a prism member mounted in it the prism, members having two angularly relating surfaces exposed to the oil in the crankcase and a light source and a light sensor mounted adjacent to the prism on the outside of the crankcase housing such that the light from each light source impinges on one of the angularly related prism surfaces and is reflected thereby to the second angulary related surface and then back to the light sensor. …
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 9, 1991 and granted March 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2013.
- 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.