Patents by Inventor Gilbert H. Forehand
Gilbert H. Forehand has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5475727Abstract: An intelligent automatic gain stabilization method and apparatus for a radiation detection instrument automatically locate the position of a predetermined characteristic within an energy spectrum, automatically determine whether the characteristic is properly located, and automatically provide gain adjustment to the output of the radiation detection instrument to maintain measurement accuracy of the system.Type: GrantFiled: July 9, 1993Date of Patent: December 12, 1995Assignee: Halliburton CompanyInventors: Ronnie J. Buchanan, Gilbert H. Forehand, Timothy D. Rice
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Patent number: 5337234Abstract: A self-contained downhole apparatus for being lowered into an oil or gas well to internally record samples of at least one environmental condition comprises three body sections linearly and releasably interconnected. One of the body sections is a selected one of a plurality of transducer housing sections. The selected transducer housing section is mechanically and electrically connected to a second body section containing microcomputer-operated signal processing circuitry. The third body section contains a power supply.Type: GrantFiled: May 5, 1992Date of Patent: August 9, 1994Assignee: Halliburton CompanyInventors: Terry O. Anderson, J. Mark Richardson, Jack C. Penn, Michael J. Lynch, Billy W. White, Gilbert H. Forehand, Richard L. Duncan, Charles F. VanBerg, Jr., Stephen E. Tilghman, Ronald E. Dant, Charles D. Donaghe
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Patent number: 5277495Abstract: A temperature to frequency converter includes two temperature detectors having an electrical characteristic, such as resistance, that varies proportionally with sensed temperature. These devices are connected into an oscillator circuit that provides an electrical signal output having a frequency inversely proportional to sensed temperature. An amplitude control feedback loop connected to the oscillator circuit maintains the amplitude of the output signal constant.Type: GrantFiled: April 24, 1992Date of Patent: January 11, 1994Assignee: Halliburton CompanyInventor: Gilbert H. Forehand
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Patent number: 5153832Abstract: A self-contained memory gauge includes either semiconductor or magnetic core memory for retaining downhole information related to sampled parameters, such as borehole temperature and pressure. A microprocessor-based computer manages the power utilization by independently and selectably energizing and de-energizing different sections of the gauge. The magnetic core memory is tested for operability, and the addressing of the magnetic core memory is adjusted in accordance with any inoperable memory locations. Samples of the monitored environmental conditions can be taken at variable rates dependent upon software monitoring of the condition, the remaining battery life and the remaining memory capacity and in response to hardware monitored pressure changes. Each sample can be taken to a selectable resolution. A watchdog circuit monitors the microprocessor to insure that it is operating within a preselected time limit.Type: GrantFiled: July 21, 1989Date of Patent: October 6, 1992Assignee: Halliburton CompanyInventors: Terry O. Anderson, J. Mark Richardson, Jack C. Penn, Michael J. Lynch, Billy W. White, Gilbert H. Forehand, Richard L. Duncan, Charles F. VanBerg, Jr., Stephen E. Tilghman, Ronald E. Dant, Charles D. Donaghe
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Patent number: 4866607Abstract: In an oil well instrumentation system, the downhole sensor system is controlled by a computer which is powered-on only during sampling movement. An independent circuit, continuously powered, detects significant sensor rate-of-change values whereby the computer-sampling equipment is powered-on. A self-contained memory gauge includes either semiconductor or magnetic core memory for retaining downhole information related to sampled parameters, such as borehole temperature and pressure. A microprocessor-based computer manages the power utilization by independently and selectably energizing and deenergizing different sections of the gauge. The magnetic core memory is tested for operability, and the addressing of the magnetic core memory is adjusted in accordance with any inoperable memory locations.Type: GrantFiled: May 6, 1985Date of Patent: September 12, 1989Assignee: Halliburton CompanyInventors: Terry O. Anderson, J. M. Richardson, Jack C. Penn, Michael J. Lynch, Billy W. White, Gilbert H. Forehand, Richard L. Duncan, Charles F. VanBerg, Jr., Stephen E. Tilghman, Ronald E. Dant, Charles D. Donaghe
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Patent number: 4794548Abstract: An apparatus for monitoring the operation of a railroad train includes two on-board units which collect and utilize data for ultimate transfer to a portable unit which can be carried onto and off of the railroad train. One of these on-board units operates under microcomputer control to compute speed, acceleration/deceleration, and distance traveled data and to store such computred data for subsequent transfer to the portable unit. The other on-board unit acquires additional data under separate microcomputer control. This data acquisition retrieves either binary or analog data, or both, and stores it in the acquiring on-board unit for later transfer to a separate memory in the other on-board unit for subsequent transfer to the portable unit. Power failure detection circuits are also implemented to insure the microcomputers are initiated in respective determinate states.Type: GrantFiled: August 28, 1986Date of Patent: December 27, 1988Assignee: Halliburton CompanyInventors: Michael J. Lynch, John E. Haley, C. Lynden Lee, Gilbert H. Forehand
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Patent number: 4717867Abstract: A load, such as a control circuit for a DC/DC converter, is initially operated by an initial load powering voltage developed by a power consuming regulator until another voltage, such as the DC/DC converter's output voltage derived from an input voltage used by the voltage regulator to establish the initial load powering voltage, reaches a predetermined level. A switching control circuit initially allows the regulator to operate and connects its output to the load. The switching control circuit, however, responds to the other voltage so that when this other voltage reaches the predetermined magnitude, the switching control circuit prevents the regulator from further operating and thus from further dissipating energy. The switching control circuit then connects the other voltage to power the load. The switching control circuit is designed so that it dissipates less energy than the regulator when the switching control circuit disables the regulator and allows the other voltage to power the load.Type: GrantFiled: December 31, 1986Date of Patent: January 5, 1988Assignee: Halliburton CompanyInventor: Gilbert H. Forehand
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Patent number: 4709234Abstract: The power-conversing apparatus includes a plurality of independently energizable electrical circuits used in receiving electrical signals from a transducer which senses an environmental condition, in processing the electrical signals, and in storing information related to the detected environmental condition. The apparatus further includes a power control circuit for continuously providing electrical power to at least one of the electrical circuits and for independently switchably providing electrical power to selectable ones of at least two others of the separately energizable circuits.Type: GrantFiled: May 6, 1985Date of Patent: November 24, 1987Assignee: Halliburton CompanyInventors: Gilbert H. Forehand, Michael J. Lynch, Richard L. Duncan, Stephen E. Tilghman, Jack C. Penn
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Patent number: 4675649Abstract: An analog-to-digital conversion technique utilizes an oscillator which provides a primary oscillating signal that drives a counter and that generates a derived signal having a frequency less than the primary signal. The derived signal is integrated for use in comparing against the threshold voltage defining the analog signal to be converted. The comparison of the integrated and the threshold signals provides a pulse width modulated signal which is related to the primary signal. The pulse width modulated signal gates the counter for generating a count at the rate established by the primary signal. This output can be communicated to a microcomputer or other device.Type: GrantFiled: September 11, 1985Date of Patent: June 23, 1987Assignee: Halliburton CompanyInventors: Gilbert H. Forehand, Michael J. Lynch
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Patent number: 4665398Abstract: A physical condition in a well bore is sampled and information taken from the sample is recorded by a method of conserving electrical energy in performing such sampling and recording. The method sequentially energizes and de-energizes a plurality of different electrical circuits within the downhole apparatus with which the physical condition is detected and in which the information is recorded. The method determines when the next sample is to be taken and, depending upon how much time remains until the next sample, de-energizes the apparatus to conserve energy.Type: GrantFiled: May 6, 1985Date of Patent: May 12, 1987Assignee: Halliburton CompanyInventors: Michael J. Lynch, Gilbert H. Forehand, Richard L. Duncan, Stephen E. Tilghman, Jack C. Penn
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Patent number: 4663628Abstract: The method for controlling the rate at which a downhole logging tool samples and records a detected condition obtains three samples of the condition at three consecutive sample times and computes a prediction value for the n-th sample from the first three samples. The method compares the actual n-th sample with the predicted value and records the (n- 1)-th sample if the variance between the predicted and actual values is outside a predetermined threshold or difference. The sample rate is changed if the actual values of the samples remain within the predicted value's preselected range for more than a preselected number of samples. The sample rate interval is also increased if the battery life or memory capacity decrease below predetermined thresholds. The sample rate interval is decreased to its shortest interval if a pressure change above a predetermined threshold is detected.Type: GrantFiled: May 6, 1985Date of Patent: May 5, 1987Assignee: Halliburton CompanyInventors: Richard L. Duncan, Michael J. Lynch, Gilbert H. Forehand, Billy W. White