Stephen R Clark

US Patent:

58167803, Oct 6, 1998

Filed:

Apr 15, 1997

Appl. No.:

8/843380

Inventors:

Richard P. Bishop - Fairfax Station VA
Bradbury R. Face - Smithfield VA
Samuel A. Face - Norfolk VA
Stephen E. Clark - Norfolk VA
Norvell S. Rose - Virginia Beach VA

Assignee:

Face International Corp. - Norfolk VA

International Classification:

F04B 3500

US Classification:

417322

Abstract:

A piezoelectrically actuated fluid pump including a pump housing, a pump chamber, inlet and outlet ports for communicating the pump chamber with the exterior of the pump housing, valves for opening and closing the ports, two prestressed piezoelectric diaphragm members which are self-actuated, and a power source is provided. The diaphragm members include a prestressed piezoelectric element which is durable, inexpensive and lightweight as compared with prior diaphragm pumps of comparable discharge capacity, and is actuated via electrical signals from an outside power source. No exterior mechanical parts for driving the diaphragm members are necessary. A modification is disclosed in which a central computer independently controls the phase angle of oscillation of the two diaphragm members, providing precise flow rate control.

US Patent:

60423455, Mar 28, 2000

Filed:

Apr 3, 1998

Appl. No.:

9/055000

Inventors:

Richard P Bishop - Fairfax Station VA
Bradbury R. Face - Smithfield VA
Samuel A. Face - Norfolk VA
Stephen E Clark - Norfolk VA
Norvell S. Rose - Virginia Beach VA

Assignee:

Face International Corporation - Norfolk VA

International Classification:

F04B 1700

US Classification:

417322

Abstract:

A piezoelectrically actuated fluid pump including a pump housing, a pump chamber, inlet and outlet ports for communicating the pump chamber with the exterior of the pump housing, valving means for opening and closing the ports, two pre-stressed piezoelectric diaphragm members which are self-actuated, and energizing means is provided. The diaphragm members include a prestressed piezoelectric element which is durable, inexpensive and lightweight as compared with diaphragm members of prior diaphragm pumps of comparable discharge capacity, and is actuated via electrical signals from an outside power source. No exterior mechanical means for driving the diaphragm members is necessary. A modification is disclosed in which a central computer independently controls the phase angle of oscillation of the two diaphragm members, providing precise flow rate control.

US Patent:

60741783, Jun 13, 2000

Filed:

Apr 15, 1998

Appl. No.:

9/060991

Inventors:

Richard P. Bishop - Fairfax Station VA
Bradbury R. Face - Smithfield VA
Samuel A. Face - Norfolk VA
Stephen E. Clark - Norfolk VA
Norvell S. Rose - Virginia Beach VA

Assignee:

Face International Corp. - Norfolk VA

International Classification:

F04B 1700

US Classification:

417322

Abstract:

A peristaltic piezoelectrically actuated fluid pump including two or more pairs of piezoelectric deformable members that are self-actuated, a flexible hose member, a pump chamber, inlet and outlet ports for communicating the pump chamber with the exterior of the flexible hose member, valves for opening and closing the ports, and a power supply is provided. The diaphragm members may include a prestressed piezoelectric element which is durable, inexpensive and lightweight as compared with diaphragm members of prior diaphragm pumps of comparable discharge capacity, and is actuated via electrical signals from an outside power source. Each pair of piezoelectric diaphragm members is actuated out of phase with the other(s) so as to allow fluid to be pumped through the flexible hose member peristaltically.

US Patent:

60710888, Jun 6, 2000

Filed:

Apr 15, 1998

Appl. No.:

9/060620

Inventors:

Richard P Bishop - Fairfax Station VA
Bradbury R Face - Smithfield VA
Samuel A. Face - Norfolk VA
Stephen E Clark - Norfolk VA
Norvell S Rose - Virginia Beach VA

Assignee:

Face International Corp. - Norfolk VA

International Classification:

F04B 1700

US Classification:

417322

Abstract:

A piezoelectrically actuated fluid pump including a pump housing, a pump chamber, inlet and outlet ports for communicating the pump chamber with the exterior of the pump housing, valves for opening and closing the ports, a pre-stressed piezoelectric diaphragm member which is self-actuated, a piston member, and a power source is provided. The diaphragm member includes a prestressed piezoelectric element which is durable, inexpensive and lightweight as compared with diaphragm members of prior diaphragm pumps of comparable discharge capacity, and is actuated via electrical signals from an outside power source. The diaphragm member drives the piston member. No exterior mechanisms are necessary for driving the diaphragm member.

US Patent:

41798228, Dec 25, 1979

Filed:

Dec 24, 1974

Appl. No.:

5/536257

Inventors:

Stephen C. Clark - Washington DC

International Classification:

G09B 706

US Classification:

35 9B

Abstract:

The console adapted to be interconnected to a computer for administering a test in which the questions have plural answers. After selecting a number of answers equal to the number of correct answers to a question, the student is informed of the number of incorrect answers and afforded an opportunity to complete the answer. This process is repeated until all of the correct answers have been identified and the number of errors in identifying the correct answers is utilized to indicate the student's score. A display of the rate of progression through the test is updated after each question is answered. A method of administering the test of plural answer questions as well as methods of scoring the test are also disclosed.

US Patent:

58617027, Jan 19, 1999

Filed:

Mar 7, 1997

Appl. No.:

8/813880

Inventors:

Richard Patten Bishop - Burke VA
Bradley D. Goldizen - Chesapeake VA
Stephen Earl Clark - Norfolk VA

International Classification:

H01L 4108

US Classification:

310330

Abstract:

A ground fault interrupter circuit ("GFIC") device having as a switching device a flextensional electroactive transducer which, when energized, opens a supply conductor between a current source and a load. When a fault current is detected a voltage is induced in a coil; due to the condition that there is less current running through the conductor from the load than through the conductor from the power supply which both extend through the core of the coil. The voltage induced in the coil is amplified by a transistor which causes the transducer to piezoelectrically "snap" from a first neutral position to a second neutral position thereby cutting of current from the power supply to the load.