Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Reexamination Certificate
2006-10-31
2006-10-31
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
Reexamination Certificate
active
07127943
ABSTRACT:
A fluid level sensor is disclosed having first and second vertically and horizontally nonoverlapping electrode plates for placing on a wall of a fluid container. Most preferably, the plates are also vertically spaced from each other. The capacitor plates are driven by a high frequency square wave. By forming nonoverlapping plates and driving them using a high frequency, the level of a fluid within the container, particularly viscous fluid, is more accurately detected. Control and detection circuitry is also disclosed to trigger an alarm if the fluid level drops below a critical level within the container.
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European Search Report, dated May 27, 2003.
Supplemental European Search Report dated May 27, 2003 (2 pages).
Draper R. Bruce
Griffiths Robert W.
Rocky Mountain Research, Inc.
TraskBritt PC
West Paul M.
Williams Hezron
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