Tempo Research Corporation

Industrial Technology, Inc.

Greenlee Textron Inc.

William Cory Wood

Paul R Siglinger

George G Galloway

John N Moss

Ronald L McWilliams

James W Thompson

Sean Nash

Edwin Glenn Yancey

Kenneth D Napps

Ewan G Browne

Randy Denby

Wayne Jacob Chappell

A fall of potential method of determining earth ground resistance which utilizes an earth ground tester and eliminates the need for utilizing removable ground stakes. Rather than utilizing a 'far stake' the method provides connection of the earth ground tester to the telephone wires. Rather than utilizing a 'near stake' the method provides for connection of the earth ground tester to the cable shield.

Method of testing ground resistance by making use of existing telephone lines

A method of and system for rapidly locating all passive underground electronic marker types in an area under survey may locate various marker types simultaneously. In accordance with one aspect of the present invention, a marker locator may sequentially transmit and receive multiple frequencies very quickly; alternatively, the transmitter may transmit a broadband signal on multiple frequencies.

Method of and system for rapidly locating all passive underground electronic marker types

A method of and system for locating a single passive underground marker type may distinguish false indications caused by other marker types. In accordance with aspects of the present invention, minimization or elimination of false marker indications may be accomplished by processing the response from a marker to determine which frequency has the largest response.

Method of and system for locating a single passive underground electronic marker type that distinguishes false indication caused by other marker types

A method and an apparatus for detecting signals in an electromagnetically noisy environment by detecting electromagnetic signals comprising a noise signal and a known signal, and compressing the electromagnetic signal to thereby generate a compressed signal. The compressed signal is filtered to generate a filtered signal comprising substantially the known signal, and the filtered signal is expanded.

Method and apparatus for filtering unwanted noise while amplifying a desired signal

The marker has a housing, an inner member and a tuned circuit. The housing has a spherical cavity therein. The inner member is located inside of the housing cavity and is rotatable therein. The tuned circuit has an inductance in the form of a coil as well as a capacitance. The tuned circuit is tuned to a particular frequency. A weight is coupled with the inner member and is eccentrically located within the spherical cavity. The eccentrically located weight seeks the lowest portion of the housing cavity. Thus, when the marker is manipulated so as to disorient the tuned circuit, the weight will rotate the inner member back to its stable position so as to properly orient the tuned circuit coil.

Self leveling underground marker

A passive electrical marker has tuned circuits, each of which includes a coil and a capacitance. The tuned circuits are oriented with respect to each other in a predetermined arrangement so as to provide a broader spatial response. A foamed core inside of the tuned circuits maintains the tuned circuits in their respective orientations and protects the tuned circuits from mechanical shock. A shell or housing around the foamed tuned circuits provides environmental protection to the tuned circuits. The tuned circuits can be foamed together in a mold and then placed into the housing. Alternatively, the tuned circuits can be foamed together inside of a housing, which housing maintains the orientations between the tuned circuits during foaming. As still another alternative, the housing can be applied to the outside of the foamed tuned circuits as a coating.

Growing community of inventors

Fort Worth, TX, United States of America

William Cory Wood