William M Kirkpatrick

US Patent:

39506533, Apr 13, 1976

Filed:

Jan 24, 1975

Appl. No.:

5/543674

Inventors:

William J. Kirkpatrick - Davenport IA

Assignee:

Agridustrial Electronics, Inc. - Bettendorf IA

International Classification:

H01H 3500

US Classification:

307116

Abstract:

A cylindrical housing contains both a circuit board and a pair of capacitive sensing electrodes. The pair of electrodes are adjacent the inside wall near an end that is to be wholly or partly covered with granular material in a container. Since an electric field is relatively concentrated about the electrodes, compared with the divergent field about the type having a single protruding electrode and depending on external ground planes, the circuits of the instrument show presence of material repeatedly quite close to a predetermined level. The unitary construction affords protection and permits the capacitive sensing electrodes to be mounted on the circuit board over a printed circuit tab.

Address:

731 Farnham Dr, N Chesterfld, VA 23236

VIN:

1GNFK16397J238002

Make:

CHEVROLET

Model:

SUBURBAN

Year:

2007