Mark Anthony Doyle

US Patent:

47077875, Nov 17, 1987

Filed:

Jan 10, 1985

Appl. No.:

6/690219

Inventors:

Carl H. Savit - Houston TX
Rhonda Boone - Houston TX
Mark Doyle - Houston TX

Assignee:

Western Geophysical Company of America - Houston TX

International Classification:

G11C 1300
G11C 1304

US Classification:

364420

Abstract:

A system and method for forming a model of an underground geological formation is disclosed wherein a quantity of non-solid material of the type which solidifies at volumetric positions impinged upon by preselected incident energy as used. Memory means are provided which have uniquely addressable location for storing data indicative of the desired and actual material states at respective volumetric positions. Means are additionally for scanning the data and sequentially directing the energy at supported, non-blocking, volumetric positions in the medium volume.

US Patent:

55943446, Jan 14, 1997

Filed:

Aug 9, 1995

Appl. No.:

8/512893

Inventors:

Mark R. Doyle - Houston TX
John T. Evans - Houston TX

Assignee:

Western Atlas International, Inc. - Houston TX

International Classification:

G01V 330
G01V 318
G01R 1302

US Classification:

324338

Abstract:

A method of extracting a phase and amplitude modulation signal impressed on a carrier is disclosed. The method includes generating the carrier at a frequency which is a multiple of the bandwidth of the modulation signal. The multiple equals 4N+1, where N is an integer. The modulation signal is impressed on the carrier, generating a phase and amplitude modulated carrier, The modulated carrier is digitally sampled at a frequency of four times the bandwidth the modulation signal. The digital sampling is initiated substantially contemporaneous with initiation of generating the carrier. A 90-degree phase shift is applied to the digitally sampled carrier to generate a quadrature component of the digitally sampled carrier. A time delay is applied to the digitally sampled carrier to restore time coincidence between the quadrature component and said digitally sampled carrier, and the phase and amplitude modulation signal is extracted by commutation of the time-delayed digitally sampled carrier and the quadrature component of the digitally sampled carrier. In a particular embodiment of the invention, the phase and amplitude can be extracted from the extracted signal.

US Patent:

46758518, Jun 23, 1987

Filed:

Sep 9, 1982

Appl. No.:

6/416532

Inventors:

Carl H. Savit - Houston TX
Mark R. Doyle - Houston TX

Assignee:

Western Geophysical Co. - Houston TX

International Classification:

G01V 100
G01V 128

US Classification:

367 41

Abstract:

Sweeps of seismic signals consisting of pulse trains having a predetermined number of pulses in which the periods or durations of the pulses are randomized and in which the wave shape and relative time displacements of the pulses in different trains provides substantially constant spectral level over a frequency range containing several octaves.

US Patent:

55044794, Apr 2, 1996

Filed:

Jun 7, 1995

Appl. No.:

8/473441

Inventors:

Mark R. Doyle - Houston TX
Fuling Liu - The Woodlands TX
Jorge O. Maxit - Houston TX

Assignee:

Western Atlas International, Inc. - Houston TX

International Classification:

G01V 100

US Classification:

3408549

Abstract:

An apparatus for communicating signals from a well logging tool to a recording unit is disclosed. The logging tool includes a transmitter comprising a source of digital bits representing measurements made by the tool, an encoder connected to the source of digital bits for transforming groups of the digital bits into multivalued symbols, a first in-phase filter and a first quadrature filter connected to the encoder so that first coordinates of the symbols are filtered in the in-phase filter, second coordinates of the symbols are filtered in the quadrature filter, the filters having responses forming a Hilbert transform pair, a digital subtractor connected to the first filters for calculating a difference between outputs of the filters, and a digital-to-analog converter connected to the output of the subtractor for generating signals to be communicated to the recording unit over a communication channel. The recording unit includes a receiver comprising an analog-to-digital converter to receive and digitize signals from the communication channel, a second in-phase filter and a second quadrature filter connected to the analog-to-digital converter, the second filters respectively having substantially the same response characteristics as the first in-phase and quadrature filters, a decision feedback equalizer connected to the second filters for correcting timing and distortion errors in the signals from the logging tool and demodulating the multivalued symbols, and a decoder connected to the equalizer for converting demodulated multivalued symbols output from the equalizer into the groups of bits conducted to the encoder in the logging tool.

US Patent:

54955475, Feb 27, 1996

Filed:

Apr 12, 1995

Appl. No.:

8/420662

Inventors:

Saeed Rafie - Houston TX
Stephen T. Ha - Houston TX
Josephine Lopez - McAllen TX
James C. Hunziker - New Caney TX
Mark R. Doyle - Houston TX

Assignee:

Western Atlas International, Inc. - Houston TX

International Classification:

G02B 644
G01V 300

US Classification:

385101

Abstract:

The present invention is a well logging cable including first conductor elements, each of the first elements consisting of a steel wire surrounded by copper strands and covered in an electrically insulating material, and at least one second conductor element including at least one optical fiber enclosed in a metal tube, copper strands surrounding the tube and the strands covered by the electrically insulating material. The first elements and the at least one second element are arranged in a central bundle. The second conductor element is positioned within the bundle so as to be helically wound around a central axis of the bundle. The bundle is surrounded by armor wires helically wound externally to the bundle.

US Patent:

61086053, Aug 22, 2000

Filed:

Dec 16, 1998

Appl. No.:

9/212171

Inventors:

Mark R. Doyle - Houston TX
Otto N. Fanini - Houston TX

Assignee:

Western Atlas International, Inc. - Houston TX

International Classification:

G01L 338

US Classification:

702 7

Abstract:

A system and method for controlling the transmitted signal for use in a well logging tool, using an iterative method (preferably the method of steepest descent) such that the transmitted signal more closely resembles a desired waveform.

US Patent:

55065775, Apr 9, 1996

Filed:

Aug 31, 1994

Appl. No.:

8/298654

Inventors:

Mark R. Doyle - Houston TX

Assignee:

Western Atlas International, Inc. - Houston TX

International Classification:

G08C 1916

US Classification:

34087001

Abstract:

The invention is a method of synchronizing a digital telemetry receiver to a digital telemetry transmitter. The method includes the steps of initializing the sampling period of the receiver, measuring the detection time of each signal event detected by the receiver relative to a time window based on the sampling period, accumulating statistics representing the detection times of each of the events, and calculating a refined sampling period based on a linear regression fit of the actual detection time of each event.

US Patent:

47501804, Jun 7, 1988

Filed:

Jul 24, 1986

Appl. No.:

6/888939

Inventors:

Mark R. Doyle - Houston TX

Assignee:

Western Atlas International, Inc. - Houston TX

International Classification:

G06F 1100

US Classification:

371 67

Abstract:

An analog signal is oversampled as a digital time series. The data samples are divided into an even and an odd sequence. Each sequence is independently low-pass filtered and the resulting two reconstructed sequences will be identical to each other and to the original if no isolated error is present in the original sequence. When the three sequences are not equal, an error exists. By noting the location or sample number of the error, the exact location of the error can be determined and the correctly reconstructed sample value can be used to replace the erroneous sample in the original sequence.