George I French

Address:

532 Freedom Trl, Brunswick, GA 31525

Phone:

9122640182

VIN:

JN8AS5MT2CW253990

Make:

NISSAN

Model:

ROGUE

Year:

2012

US Patent:

42862086, Aug 25, 1981

Filed:

Jan 7, 1980

Appl. No.:

6/110009

Inventors:

George R. French - South Berwick ME
John S. Oliver - Danville NH

Assignee:

Emhart Industries, Inc. - Indianapolis IN

International Classification:

G01R 2726

US Classification:

324 61R

Abstract:

A fluid interface detector includes a circuit for detecting the presence of one of two fluids to establish an interface level between the two fluids. The detection circuit produces an output signal having a variable pulse width determined by which of the two fluids is present. A reference signal of a predetermined pulse width is compared to the pulse width of the output signal of the detection circuit by a comparator which produces an output signal indicating which of the two fluids is present. The detection circuit includes at least one capacitive sensing device and in accordance with the present invention may include a plurality of capacitive sensing devices to detect a fluid interface at various levels.