James Michael Webster

US Patent:

47107510, Dec 1, 1987

Filed:

Apr 24, 1986

Appl. No.:

6/855400

Inventors:

James B. Webster - Santa Ana CA

Assignee:

Environmental Protection Systems - Irvine CA

International Classification:

G08B 1960

US Classification:

340522

Abstract:

A sensor circuit for detecting a ground fault in devices that eliminate or prevent static electricity and for producing appropriate alarm signals to indicate an undesirable ungrounded condition. In particular, the sensor circuit includes means for monitoring a ground-fault system by using a wrist strap monitoring circuit, a proximity monitoring circuit and at least one surface monitoring circuit. The wrist strap monitoring circuit and the surface monitoring circuits are used to detect the status of a grounding connection between an operator and/or a surface at a work station and a ground potential. The proximity monitoring circuit is used to determine whether an operator (or another person) is in proximity to the work station. A logic circuit means detects the status of the aforementioned monitoring circuits and selectively activates an alarm means if a fault condition exists.

US Patent:

43587500, Nov 9, 1982

Filed:

Oct 20, 1978

Appl. No.:

5/953199

Inventors:

James B. Webster - Santa Ana CA

International Classification:

B60R 2500

US Classification:

340 65

Abstract:

In a vehicle alarm system there is provided apparatus for producing a digital control signal that defines a command to initiate a timing operation such as an entry delay. The apparatus comprises a transducer, preferably including a piezoelectric device, for generating an electrical waveform that, while the vehicle is undergoing vibration, has an acceleration-representing analog signal component. The apparatus further comprises threshold-setting circuitry responsive to the electrical waveform for causing the initiate-timing command to be given when the acceleration representing signal component exceeds a predetermined threshold.