Apparatus and method for determining rate of leakage of liquid from and into tanks
CA 1286523 C · Owner: Johnson, Dennis W. · Inventors: Johnson, Dennis W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus and method for measuring leakage of liquid into or from a storage tank such as a buried gasoline tank. The storage tank should have rigid walls. A reference tank is immersed into liquid stored in the storage tank and is filled to the same height and with the same liquid as contained in the storage tank, and having sealed and rigid thermal energy conducting walls at least where it is in contact with the liquid, but having vapor space above the liquid in the reference tank vented to the vapor space in the storage tank. The cross-sectional area of the reference tank is desirably (but not necessarily) proportional to the cross-sectional area of the storage tank at least wherever it is …
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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 July 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 23, 2008.
- 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
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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.