Richard F Chandler

46101055, Sep 9, 1986

May 3, 1985

6/730179

Richard G. Chandler - Conroe TX

A01M 2304

43 69

A trap for catching rodents and other pests in permitting the user to selectively trap the same alive or dispose of them at the time of trapping. A container is provided having bottom and side walls and defining an opening at the upper portion thereof. A closure number is pivotally supported by a wall portions of the enclosure and is pivotal, responsive to the weight of a rodent or pest, causing the same to fall into the enclosure. The enclosure may contain water or any other material suitable for eratication. The closure structure defines a bait containing depression in which a protein containing bait such as grain may be placed to lure rodents onto the closure. The closure is urged to its substantially horizontal, closed position by a counterweight or other urging device mounted on the closure.

48734888, Oct 10, 1989

Nov 18, 1986

6/932231

Thomas D. Barber - Houston TX
Richard N. Chandler - Houston TX
John F. Hunka - Kingwood TX

Schlumberger Technology Corporation - Houston TX

G01V 328

324339

Induction logging sonde including transmitter and receiver solenoid coils mounted on a support and axially separated from each other. The support is made of conductive material and comprises at least one first longitudinal portion for mounting the coils and second longitudinal portions on each side of the first portion. At least the first portion has a substantially continuous and axisymmetric outer surface so as to favor the flow of eddy currents around the surface, whereby the electric field on that surface is substantially cancelled.

44279442, Jan 24, 1984

Jan 18, 1983

6/459010

Richard N. Chandler - Houston TX

Schlumberger Technology Corporation - New York NY

G01V 318

324353

Method and apparatus for investigating earth formations according to the present invention include positioning an opening of a fluid reservoir in contact with the surface of an earth formation to be investigated and injecting the fluid at high pressures through the opening into the formation to cause a transient electrokinetic potential to form in the formation. The transient streaming potentials generated are detected by appropriate electrodes, and the outputs of the electrodes, representative of the generated potentials, are then processed to determine a characteristic response time of these streaming potentials. Thereafter, from a knowledge of the characteristic response time of the detected streaming potentials a measurement of the permeability of the formation is derived.

51576058, Oct 20, 1992

Apr 27, 1987

7/043130

Richard N. Chandler - Houston TX
Richard A. Rosthal - Houston TX

Schlumberger Technology Corporation - Houston TX

G01V 318

364422

Induction logging apparatus is disclosed which depends for its operation not only upon its arrangement of coils, but also upon the skin depth of the formation. The skin effect of the formation is used advantageously by operating a simple induction sonde at a plurality of frequencies simultaneously. Improved depth of investigation and improved vertical resolution result from the invention. Simple arrays are disclosed for the induction logging apparatus. A sonde with a single transmitter and a plurality of two-coil receiver arrays are preferred. The apparatus acquires both the in-phase and quadrature components of each receiver array signal at several frequencies. The response function is shaped by using a multi-channel deconvolution filter.

46511016, Mar 17, 1987

Apr 3, 1985

6/718003

Thomas D. Barber - Houston TX
Richard N. Chandler - Houston TX
John F. Hunka - Kingwood TX

Schlumberger Technology Corporation - Houston TX

G01V 328

324339

Induction logging sonde including transmitter and receiver solenoid coils mounted on a support and axially separated from each other. The support is made of conductive material and comprises at least one first longitudinal portion for mounting the coils and second longitudinal portions on each side of the first portion. At least the first portion has a substantially continuous and axisymmetric outer surface so as to favor the flow of eddy currents around the surface, whereby the electric field on that surface is substantially cancelled.

40357180, Jul 12, 1977

Aug 23, 1976

5/716725

Richard N. Chandler - Houston TX

Schlumberger Technology Corporation - New York NY

G01N 2700

324 5G

In the representative embodiment of the present invention disclosed herein, a nuclear-magnetism logging tool is arranged with at least its polarizing and detecting coil isolated in an enclosed chamber containing a uniquely-treated hydrogenous oil and preferably coupled to a suitable compensating system operatively arranged for responding to borehole pressure and temperature conditions. In particular, a selected, minor amount of a ferromagnetic colloid is dispersed in the oil in a sufficient concentration for uniquely effecting a controlled decay of nuclear magnetic noise signals from the coil-isolating oil, with this decay being of selected rapidity sufficient to avoid interference with the measurement of nuclear magnetic measurement signals from earth formations.