David D Jacobs

US Patent:

52035379, Apr 20, 1993

Filed:

Mar 9, 1992

Appl. No.:

7/848393

Inventors:

David C. Jacobs - Hampton VA
Joseph A. Hochadel - Yorktown VA

Assignee:

Teledyne Industries, Inc. - Los Angeles CA

International Classification:

F16K 3102
H01L 4108

US Classification:

25112906

Abstract:

A piezoceramic valve includes a valve actuator sandwich assembly including a piezoceramic bending element flexibly bonded between two metal sheets. Flexible elastomeric sheets are bonded to outer surfaces of the metal sheets, respectively, to form the sandwich assembly. The valve includes a first supporting member which sealingly engages an outer surface of the first elastomeric sheet and a second supporting member which sealingly engages an outer surface of the second elastomeric sheet to flexibly support the valve actuator sandwich assembly between the two supporting members. The valve actuator is engageable with a valve seat to prevent flow through the valve and is deflectable away from the valve seat to allow flow through the valve. The piezoceramic bending element is isolated in the valve actuator sandwich assembly from the flow stream to prevent diffusion of low molecular weight gases through the porous ceramic and to isolate electrically active elements of the bending element from the flow stream.

US Patent:

55579728, Sep 24, 1996

Filed:

Sep 13, 1994

Appl. No.:

8/305059

Inventors:

David C. Jacobs - Hampton VA
William J. Alvesteffer - Newport News VA

Assignee:

Teledyne Industries, Inc. - Los Angeles CA

International Classification:

G01L 700
G01L 2112

US Classification:

73756

Abstract:

A miniaturized silicon based thermally controlled vacuum sensor uses thin film resistors on a membrane in a minute measuring chamber to accurately detect vacuum pressures in the range of 760 Torr to 1. times. 10. sup. -5 Torr. The configurations of the measuring chamber and gas diffusion port of the sensor structure insure that heat transfer from the membrane is predominately conductive over the pressure detection range to provide linear output up to 0. 1 Torr. A microprocessor is used to control and measure power required to maintain a predetermined temperature differential between a sensing resistive element on the membrane and an ambient temperature sensing element of the sensor base from analog voltage and current values. Pressure detection errors introduced by ambient temperature variations are minimized by measuring power dissipated into the gas. Analog and digital converters for both current and voltage signals use a. SIGMA. -. DELTA.

Address:

1017 Witch Pt Trl, Virginia Bch, VA 23455

VIN:

1ZVHT85HX75228976

Make:

FORD

Model:

MUSTANG

Year:

2007

Address:

901 5 Pt Rd, Virginia Beach, VA 23454

VIN:

WVWAR71K77W041400

Make:

VOLKSWAGEN

Model:

RABBIT

Year:

2007