Liquid level indicator
CA 1161412 A · Owner: Economics Laboratory, Inc. · Inventors: Mizuno, William G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
EL Code 227.00, LIQUID LEVEL INDICATOR ABSTRACT OF THE DISCLOSURE, An improved liquid level indicator comprising a lens-like transparent head, an elongated transparent stem extending from the head, the stem having an internally reflecting, pointed prism or prism section on its distal end. The present indicator is preferably of a first color and is intended to detect the level of a liquid of a second color, the relationship between the first and second colors being such that the brightness of the indicator is enhanced when it is above the liquid, appearing essentially black when the prismatic end is immersed in 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
- Granted January 31, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 31, 2001.
- 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.