William A Gruber, 83Downey, CA

4049935, Sep 20, 1977

May 17, 1976

5/686864

William Paul Gruber - Altadena CA

Allied Chemical Corporation - Morris Township NJ

H01H 3534

200 83P

A pressure switch for use within a pressure chamber containing a gas having a pressure of P. sub. 2, said switch including a pressure vessel containing gas having a pressure of P. sub. 1, said vessel circumscribed by an end wall at one end thereof, side walls and closed at the second end by a flexible diaphragm, said diaphragm biased in a first position and subjected to P. sub. 2 on one surface thereof and to P. sub. 1 on the other surface thereof, said diaphragm assuming said first position when P. sub. 2 does not exceed P. sub. 1 by a predetermined amount and assuming a second position under P. sub. 2 when P. sub. 2 does exceed P. sub. 1 by said amount, and switch means operatively associated with movement of said diaphragm.

4424422, Jan 3, 1984

Aug 3, 1981

6/289166

Lon E. Bell - Altadena CA
William P. Gruber - Altadena CA

Technar, Inc. - Arcadia CA

H05B 102
H01H 3760
F02M 3112
F24H 110

219205

A thermostatically controlled electric fuel heater for raising the temperature of diesel fuel flowing from a fuel tank to a fuel filter to prevent precipitation of wax crystals in the fuel filter and consequent filter clogging at low ambient temperatures includes a heat conductive tube incorporated as part of the fuel line a short distance upstream of the filter. An electric heating assembly is positioned on the tube and includes an electric resistance heating element helically wound about the tube and controlled by a thermostat responsive to the temperature of the tube and located upstream from the heating element. The thermostat includes a molded plastic frame having a central opening through which the tube passes. The thermostat includes a bimetallic thermal element secured to the frame and arranged to actuate a snap-action switch carried by the frame. The frame includes a baffle for thermally isolating the thermal element from the heating element.

4477715, Oct 16, 1984

Jul 19, 1982

6/399337

Lon E. Bell - Altadena CA
William P. Gruber - Altadena CA

Technar Incorporated - Arcadia CA

H05B 102
F02M 3100
F23D 1144
F24H 110

219205

An electric heater for heating diesel fuel includes a housing having an inlet and an outlet. A flat disk-shaped PTC thermistor is centrally mounted in the housing and is arranged so that the inlet directs fuel against one side of the thermistor to divert the flow of fuel outwardly around the marginal edges of the thermistor. An electrical resistance heater unit surrounds the thermistor between the walls of the housing and the thermistor and is provided with spaces through which the outwardly diverted fuel passes. A divider wall in the housing spaced from the heater unit and thermistor directs the fuel passing through the heater unit across the opposite side of the thermistor to the housing outlet. The PTC thermistor and electric heater unit are connected electrically in series whereby the thermistor functions to control heating output of the fuel heater in accordance with ambient temperature conditions.

4434414, Feb 28, 1984

Mar 31, 1981

6/249383

Lon E. Bell - Altadena CA
William P. Gruber - Altadena CA

Technar, Inc. - Arcadia CA

H01H 6104

337102

A thermally operated snap-acting switch uses a switch arm and tension spring for rotating the switch arm. A thermal-responsive element moves the pivot of theswitch arm relative to the centerline of the spring to actuate the switch. Heater means activates the thermal-responsive element for operating the switch.

4541731, Sep 17, 1985

Apr 21, 1983

6/487067

Lon E. Bell - Altadena CA
William P. Gruber - Altadena CA

Technar, Incorporated - Altadena CA

G01K 1126

374117

A temperature sensing transducer has a mechanically vibrating member whose rigidity varies with temperature, changing the resonant frequency. An output signal is generated having a frequency controlled by the vibrating member. The rigidity is caused to vary with temperature by making the vibrating member from a material whose modulus of elasticity is sensitive to temperature changes in the desired measurement range. Also by making the vibrating member of a bimetal shaped as a frusto-conical disk, the rigidity of the disk changes with temperature due to internal strains.