DONALD R JOHNSON, JR
Electrician at Coast Brg St, Houston, TX

4897605, Jan 30, 1990

Mar 17, 1986

6/840370

Percy T. Cox - Houston TX
Wayne F. Warren - Houston TX
Donald L. Johnson - Houston TX

Texaco Inc. - White Plains NY

G01V 310, G01V 318

324341

A well logging system and method of the present invention determines the dielectric constant and/or conductivity of earth formations some of which have fluid invasion. The system and method of the present invention includes the transmission of electromagnetic energy into the earth formation from a first location in a borehole in the formations at a frequency which enables the electromagnetic energy to propagate throughout the surrounding earth formations. Electromagnetic energy is received by receivers at three locations in the borehole which are spaced longitudinally from the location of the transmission of the electromagnetic energy. The receivers provide signals representative of the total electromagnetic fields at those locations. The dielectric constant and/or resistivity of the earth formations are determined in accordance with portions of the signals from the three receivers corresponding to secondary electromagnetic fields at the three receiving locations.

4622518, Nov 11, 1986

Apr 6, 1984

6/579316

Percy T. Cox - Houston TX
Wayne F. Warren - Houston TX
Donald L. Johnson - Houston TX

Texaco Inc. - White Plains NY

G01V 330, G01V 328

324341

A well logging system and method of the present invention determines the dielectric constant and/or conductivity of earth formations some of which have fluid invasion. The system and method of the present invention includes the transmission of electromagnetic energy into the earth formation from a first location in a borehole in the formations at a frequency which enables the electromagnetic energy to propagate throughout the surrounding earth formations. Electromagnetic energy is received by receivers at three locations in the borehole which are spaced longitudinally from the location of the transmission of the electromagnetic energy. The receivers provide signals representative of the total electromagnetic fields at those locations. The dielectric constant and/or resistivity of the earth formations are determined in accordance with portions of the signals from the three receivers corresponding to secondary electromagnetic fields at the three receiving locations.

4687995, Aug 18, 1987

Mar 5, 1984

6/586465

Wayne F. Warren - Houston TX
Theodore W. Nussbaum - Houston TX
Percy T. Cox - Houston TX
Donald L. Johnson - Houston TX

Texaco Inc. - White Plains NY

G01V 330, G01V 328, G01V 310, G01V 318

324341

Apparatus for determining the dielectric constant and/or resistivity of earth formations traversed by a borehole includes a transmitter which transmits electromagnetic energy into the earth formation from a first location in the borehole at a frequency which enables the electromagnetic energy to propagate throughout the surrounding earth formations. Receivers receive electromagnetic energy at two locations in the borehole which are spaced longitudinally from the transmitter provide signals representative of the total electromagnetic fields at the receiver locations. Circuitry determines the dielectric constant and/or resistivity of the formations in accordance with a secondary field ratio and a phase difference derived from the signals provided by the receivers.

4115864, Sep 19, 1978

Apr 27, 1977

5/791559

Howard Andrew Vick - Pearland TX
Donald B. Johnson - Houston TX

Hycel, Inc. - Houston TX

G08B 2100

364550

A fail safe detector in a cardiac monitoring system provides an alarm to indicate failure of the system to respond to cardiac waveforms supplied thereto from cardiac waveform sources. A time out circuit will produce the alarm if not periodically reset by pulses produced in response to measurement of cardiac waveforms. Means are provided for sensing whether cardiac waveforms are received from the sources to provide an alternate means of triggering periodic reset signals when no waveforms are received from the sources to prevent false alarms.

4124894, Nov 7, 1978

Apr 27, 1977

5/791557

Howard A. Vick - Pearland TX
Donald B. Johnson - Houston TX

Hycel, Inc. - Houston TX

G06F 1542, A61B 504

364417

A system for simultaneously monitoring one or a plurality of patients samples each electrocardiac waveform of each patient to generate a model waveform for each patient. The image is resolved into contour intervals, e. g. PR, QR, ST and T intervals, and the system establishes a set of interval limits for each patient to which samples of subsequently monitored waveforms are compared. Errors associated with each patient are separately stored and reported by the system in an order which may correspond to a priority ranking of the seriousness of the conditions with which the errors are associated.

8193946, Jun 5, 2012

Nov 10, 2006

12/065529

Sinan Sinanovic - Sarajavo, BA
Donald H. Johnson - Houston TX, US
Wallace R. Gardner - The Woodlands TX, US
Li Gao - Missouri TX, US
Carl A. Robbins - Houston TX, US

Halliburton Energy Services, Inc. - Houston TX

H04H 9/00

3408554, 367 82

Acoustic telemetry devices and methods that provide directional detection. In one embodiment, a disclosed acoustic telemetry device comprises at least two acoustic sensors and an electronics module. The electronics module combines the detection signals from the acoustic sensors to obtain a combined signal that substantially excludes signals propagating in a direction opposite to the communication signal. The disclosed systems and methods can be trained in the field and will readily accommodate an irregular and unknown signal transmission medium between the two acoustic sensors.

4810970, Mar 7, 1989

Dec 22, 1986

6/945438

Wayne F. Warren - Houston TX
Donald L. Johnson - Houston TX

Texaco Inc. - White Plains NY

G01V 330, G01V 338

324338

An electromagnetic energy well logging system and method includes transmitting electromagnetic energy substantially at a frequency of 4 MHz into an earth formation from a borehold traversing the earth formation. The true resistivity of an oil-based flushed zone of the earth formation is derived in accordance with the transmitted electromagnetic energy after it is passed through at least a portion of the oil-based flushed zone.