1
Holden John C, Wray Gary Q: Improved annulus pressure operated well testing apparatus and its method of operation. Halliburton Company, Tregoning John H, Cockfield James E, Gonzalez Floyd A, December 24, 1974: US3856085 (90 worldwide citation)

A full opening, annulus pressure responsive, formation testing method and apparatus wherein both valve closing and valve opening biasing forces are generated in response to annulus pressure and wherein a full opening, formation fluid flow passage is provided by the testing valve. A disabling mechani ...


2
Holden John C, Wray Gary Q: Wellbore circulating valve. Halliburton Company, Tregoning John H, Gonzalez Floyd A, Cockfield James E, November 26, 1974: US3850250 (53 worldwide citation)

A wellbore circulating valve especially useful in a string of testing tools ultilizes a sequentially ratcheted inner mandrel which covers a series of flow ports and is opened by a predetermined sequence of operations which move the mandrel away from the flow ports thereby communicating the annulus w ...


3
Fish Harold D, Kalberer Karl H: Method and apparatus for pipeline inspection. Halliburton Company, Rogers III L Lawton, Gonzalez Floyd A, Tregoning John N, May 20, 1975: US3885091 (30 worldwide citation)

A pipeline inspection system including a camera having an annular illumination source surrounding the lens so that the illumination is concentrated on the pipeline sidewalls within the viewing angle of the camera. By use of near-infrared radiation having a wavelength on the order of 900 nanometers, ...


4
Wray Gary Q, Holden John C: Method for testing oil wells. Tregoning John H, Gonzalez Floyd A, January 14, 1975: US3860069 (27 worldwide citation)

An annulus pressure operated oil well testing and sampling apparatus utilizes hydrostatic pressure to supplement spring means which biases against valve means to hold the valve means closed until application of sufficient hydraulic pressure to the annular fluid opens the tool to the formation and al ...


5
Gass Edward W, Guest Robert J: System for nondestructively testing vessels. Halliburton Company, Gonzalez Floyd A, Rogers III L Lawton, Tregoning John H, November 4, 1975: US3916673 (10 worldwide citation)

A system for nondestructively testing elastically and plastically deformable vessels, particularly pipelines to determine the 'yield' characteristics thereof, particularly with respect to a predetermined specified yield or strain point. A deformation computer and a ratio computer are utilized to pro ...


6
Jameson Douglas L: Fluid flowmeter. Halliburton Company, Gonzalez Floyd A, Fish Jr John M, Tregoning John H, April 29, 1975: US3880003 (7 worldwide citation)

A magnetic fluid flowmeter of the turbine type having two bearing supports each holding a bearing, a shaft between the bearings, and a low inertia rotor mounted on the shaft, wherein the upstream support employs a turbulence inducing flat downstream face lying in a plane perpendicular to the directi ...


7
Frizzell Joseph G, Hulme Jack R: Electronic signal multiplier for flowmeters. Halliburton Company, Rogers III L Lawton, Gonzalez Floyd A, Tregoning John H, June 24, 1975: US3890837 (5 worldwide citation)

A frequency multiplier for frequency variable electronic signals for use with a fluid flow measuring system. The generally sinusoidal output signal from a fluid flowmeter is converted to a square wave signal of the same frequency. The square wave signal is integrated to form a triangular wave signal ...


8
Wauson Warren C: Variable set point speed control for hydrostatic transmissions. Halliburton Company, Gonzalez Floyd A, Tregoning John H, June 24, 1975: US3890782 (3 worldwide citation)

A control for use in hydrostatic transmissions is presented that automatically holds constant the speed of a fixed displacement hydraulic motor being driven by a variable displacement hydraulic pump when the pump speed is not constant. A differential hydraulic pressure from a venturi in the transmis ...