Gary J Craig

US Patent:

6853604, Feb 8, 2005

Filed:

Apr 23, 2002

Appl. No.:

10/128090

Inventors:

James Spackman - Buchanan Dam TX, US
Mike Maples - Houston TX, US
Gary Craig - Houston TX, US
Louis W. Erath - Abbeville LA, US
John Luscombe - Oxford, GB

International Classification:

G01V001/38

US Classification:

367154, 367149, 367173, 181110

Abstract:

A support structure for piezoelectric elements in a marine seismic cable is provided. The support structure comprises upper and lower cylindrical halves, each with channels formed therein. Two axial channels are adapted to retain three piezoelectric elements each. A third axial channel, positioned between the sensor element channels, is adapted to retain a flexible circuit. Transverse channels between the sensor element channels and the circuit channels accommodate extension from the flexible circuit. The piezoelectric elements are mounted within their respective channels with a resilient pad with adhesive on both sides. The piezoelectric elements are graded so that any group of three piezoelectric elements exhibits approximately the same sensitivity as any of the other three groups of piezoelectric elements on the support structure.

US Patent:

20130048580, Feb 28, 2013

Filed:

Aug 31, 2011

Appl. No.:

13/222334

Inventors:

Sean Bailey - Houston TX, US
Gary Craig - Houston TX, US
Padira Reddy - Houston TX, US

Assignee:

NABORS INTERNATIONAL INC. - Houston TX

International Classification:

F16L 3/08

US Classification:

211 131

Abstract:

In one embodiment, a cable extension mechanism includes a housing and a plurality of cable tray segments adapted to retain elongate material therein, wherein each cable tray segment includes first and second cable trays. A sheave is disposed on an axle between the first and second cable trays thereby forming an extendable elbow. At least one wheel assembly is coupled to each cable tray segment to enable the tray segment articulate between a first position wherein the elongate material is stored and has a first length shorter than an actual length of the elongate material and a substantially flat second position, thereby extending a length of the elongate material disposed thereon.

US Patent:

44480571, May 15, 1984

Filed:

May 21, 1982

Appl. No.:

6/380840

Inventors:

Gary J. Craig - Houston TX

Assignee:

Geosource Inc. - Houston TX

International Classification:

G01V 1300
G01M 1900

US Classification:

73 1DV

Abstract:

An apparatus and method for testing a geophone during assembly is disclosed. The apparatus includes a light source cooperating with a photocell for generating a voltage signal in response to light. A member for support of the geophone to be tested is located in a defined path between the light source and the photocell for generating a voltage signal. The apparatus further includes a display unit for indicating the voltage signal generated, which is representative of the resilient characteristics of the geophone springs, characterizing the position of the geophone coil and its resonant frequency.

US Patent:

52991725, Mar 29, 1994

Filed:

Feb 3, 1993

Appl. No.:

8/013052

Inventors:

Algernon S. Badger - East Bernard TX
Gary J. Craig - Houston TX

Assignee:

Halliburton Geophysical Services, Inc. - Houston TX

International Classification:

H04B 1700

US Classification:

367 13

Abstract:

A method for precisely adjusting the sensitivity of a polarized crystal hydrophone by applying a voltage signal to the hydrophone. Voltage pulses having selected characteristics are repeatedly applied to the crystal until it is determined that the sensitivity of the crystal has reached a desired level.

US Patent:

56755562, Oct 7, 1997

Filed:

Oct 19, 1995

Appl. No.:

8/545111

Inventors:

Louis W. Erath - Abbeville LA
Gary Craig - Houston TX

Assignee:

Syntron, Inc. - Houston TX

International Classification:

H04R 1700

US Classification:

367166

Abstract:

A hydrophone structure comprises a hydrophone casing within which is mounted a conductive substrate. Sound pressure signals are conducted into the interior of the substrate, on which are mounted piezoelectric crystals on the exterior of the substrate. The volume between the casing and the substrate is nearly filled with a fluid, preferably oil. One or more bubbles of air remain in the volume between the casing and the substrate to permit vibration of the substrate and consequently the piezoelectric hydrophone element.

US Patent:

61282510, Oct 3, 2000

Filed:

Oct 15, 1999

Appl. No.:

9/418883

Inventors:

Louis W. Erath - Abbeville LA
Gary Craig - Houston TX
Michael Maples - Houston TX
John Luscombe - Sugarland TX

Assignee:

Syntron, Inc. - Houston TX

International Classification:

G01V 138

US Classification:

367154

Abstract:

An arcuate or flat ferroelectric sensor is incorporated in a seismic streamer. The structure comprises an interior cable, a surrounding woven strength member, an overlying foam floatation layer, and an enclosing jacket. One or more elongate channels are formed in the overlying floatation layer, and one or more hydrophones are mounted in the channel(s). The elongate channel enlarges the acoustic aperture for the reception of seismic signals.

US Patent:

6151277, Nov 21, 2000

Filed:

Apr 16, 1999

Appl. No.:

9/292915

Inventors:

Louis W. Erath - Abbeville LA
Gary Craig - Houston TX

Assignee:

Syntron, Inc. - Houston TX

International Classification:

G01V 138
G01V 116

US Classification:

367173

Abstract:

An arcuate or flat ferroelectric sensor is incorporated in a seismic streamer. The structure comprises two half-cylinders which are mounted together around a cable. The half-cylinders are coupled together by bolts or pins or any other appropriate means. Each half-cylinder defines a well into which a sensor is mounted. With the sensor in place, the structure is covered over with a sound-transparent material to receive an acoustic signal into the sensor. Electrical leads from the sensor are directed through ports in the half-cylinders, and the leads are connected together to provide a composite sensed signal to the cable in analog form. The sensor in each half-cylinder is a single element hydrophone that, when connected to a sensor in a complementary half cylinder in series or in parallel, forms an acceleration cancelling hydrophone.

US Patent:

61607622, Dec 12, 2000

Filed:

Jun 17, 1998

Appl. No.:

9/098918

Inventors:

John Luscombe - Sugarland TX
Gary J. Craig - Houston TX
John L. Maida - Houston TX
Louis W. Erath - Abbeville LA
Malcolm Paul Varnham - Alresford, GB
Ed Kluth - Alresford, GB

Assignee:

Geosensor Corporation - Houston TX

International Classification:

H04R 102

US Classification:

367149

Abstract:

An element that is sensitive to a pressure or acceleration signal comprises an optical element capable of changing its index of refraction and/or path length in response to a time varying pressure or in response to acceleration and a pliant mounting member supporting the optical element. The mounting member changes its geometrical configuration in response to the time varying pressure or acceleration. Some embodiments of the invention use a mechanical amplifier to achieve the needed sensitivity.

Address:

5815 Ldg Crk Dr, Houston, TX 77066

Phone:

(281)4400273

VIN:

3VWPW31C77M518411

Make:

VOLKSWAGEN

Model:

NEW BEETLE

Year:

2007