Stephen A Marshall

US Patent:

D4204697, Feb 8, 2000

Filed:

Mar 23, 1998

Appl. No.:

D/085388

Inventors:

Stephen R. Marshall - Pacific Palisades CA

Assignee:

Forespar Products Corp - Rancho Santa Margarita CA

International Classification:

2902

US Classification:

D29124

US Patent:

44189443, Dec 6, 1983

Filed:

Feb 11, 1981

Appl. No.:

6/233360

Inventors:

Stephen W. Haines - Tustin CA
Stephen R. Marshall - Mission Viejo CA
Mark E. Steen - Chino Hills CA
Robert C. Swanland - Riverside CA

International Classification:

F16L 3500

US Classification:

285 24

Abstract:

A fluid coupling has a male member having a generally rigid base and an attached, relatively resilient face with a first fluid flow path opening from the resilient face. A female member of the coupling has a generally cylindrical receptacle with an opening for admitting the male member and a second fluid flow path for communication with the first fluid flow path in the male member when the male member is inserted into and rotated in the receptacle. The male and female members have cooperating cam surfaces opposite the opening into the fluid flow path in the member for urging the members together with a force directed at the opening. The force compresses the resilient face of the male member against the receptacle to seal the fluid flow paths about the openings. The preferred embodiment is a T coupling in which the male member has a third fluid flow path extending through it and in communication with the first fluid flow path. The third fluid flow path is preferably eccentric of the cross section of the male member to aid and show the rotation of the male member in the receptacle.

US Patent:

20190018079, Jan 17, 2019

Filed:

Sep 11, 2018

Appl. No.:

16/127295

Inventors:

- Manchester NH, US
Stephen Marshall - Manchester NH, US
Aaron Cook - Deerfield NH, US

Assignee:

Allegro MicroSystems, LLC - Manchester NH

International Classification:

G01R 33/07
G01R 33/00

Abstract:

Methods and apparatus for a sensor having non-ratiometric fault trip level setting. In embodiments, a sensor has a sensing element with a fixed gain. A signal processing module receives the fault trip level setting and maintains the fault trip level setting constant during changes in the supply voltage.

US Patent:

20170115362, Apr 27, 2017

Filed:

Oct 21, 2015

Appl. No.:

14/918716

Inventors:

- Worcester MA, US
Stephen Marshall - Manchester NH, US
Aaron Cook - Deerfield NH, US

Assignee:

ALLEGRO MICROSYSTEMS, LLC - Worcester MA

International Classification:

G01R 33/07
G01R 33/00

Abstract:

Methods and apparatus for a sensor having non-ratiometric fault trip level setting. In embodiments, a sensor has a sensing element with a fixed gain. A signal processing module receives the fault trip level setting and maintains the fault trip level setting constant during changes in the supply voltage.

US Patent:

20170099037, Apr 6, 2017

Filed:

Oct 6, 2015

Appl. No.:

14/876210

Inventors:

- Worcester MA, US
Stephen Marshall - Manchester NH, US

Assignee:

ALLEGRO MICROSYSTEMS, LLC - Worcester MA

International Classification:

H03F 3/45

Abstract:

An electronic amplifier has a feedback circuit with a transconductance amplifier.