Thomas J Bright

US Patent:

39435016, Mar 9, 1976

Filed:

Feb 7, 1975

Appl. No.:

5/547868

Inventors:

Robert A. Kulka - Livingston NJ
Thomas F. Bright - Bergenfield NJ
Thomas P. Bruno - Philipsburg NJ
Charles S. Huffsmith - Metuchen NJ

Assignee:

Wood Industries, Inc. - Middlesex NJ

International Classification:

G08B 2100

US Classification:

340253R

Abstract:

The high D. C. voltage power supply device for the electrodes of an electrostatic ink mist prevention system in rotary printing machines has a conventional full-wave voltage doubling circuit consisting basically of a transformer, plug-in rectifiers, plug-in capacitors and plug-in bleeder resisters. Additional circuitry mounted on an interchangeable printed circuit board comprising exclusively standard solid state switching elements such as an integrated circuit for producing an output pulse when the line voltage goes through zero voltage, which is utilized for turning the high voltage on and off via an SCR firing circuit in addition to illuminating a pilot light via a triac firing circuit. The D. C. high voltage load current is sensed across a resistor, and a resistor potentiometer is provided for setting the high voltage current turn-off trip point. A timing device is provided for re-energizing the solid state circuitry after a preset time interval.

US Patent:

39421767, Mar 2, 1976

Filed:

Feb 4, 1974

Appl. No.:

5/439409

Inventors:

Thomas F. Bright - Paterson NJ

Assignee:

Bergen Laboratories, Inc. - Paterson NJ

International Classification:

G08B 108
H04B 1100

US Classification:

340416

Abstract:

An ultrasonic alarm system comprising a transmitter having an oscillator which produces an ultrasonic carrier frequency signal. An audio signal generator produces a signal which modulates the carrier signal. The modulated signal is applied to a crystal through a tuned circuit. The transmitter is energized by operating a pushbutton which remains latched in operative position and which is unlatched only by the use of special devices. A plurality of receivers are provided and individual receivers are positioned at different locations throughout the premises to be protected. Each receiver includes a demodulator that demodulates the received signal and applies the same to a phase locked loop type phase detector which actuates an alarm when the demodulated signal is present. The alarm indicates the particular receiver that has been activated so that help may be dispatched immediately to the correct location.