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Marker device for underground infrastructure |
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Magneto-mechanical marker with enhanced frequency stability and signal strength |
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2021-02-23 |
| 10763823 |
Elliptically-shaped resonator markers with enhanced frequency stability and gain |
Curtis L. Shoemaker, Ding Wang |
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| 10649112 |
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Curtis L. Shoemaker, Ding Wang |
2020-05-12 |
| 10495772 |
Magneto-mechanical marker with enhanced frequency stability and signal strength |
— |
2019-12-03 |
| 9638822 |
Magnetomechanical markers for marking stationary assets |
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2017-05-02 |
| 9013274 |
Magnetomechanical markers for marking stationary assets |
Dean M. Dowdle, Michael E. Hamerly, William C. Egbert, Terrence H. Joyce |
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| 7319387 |
GPS interface for locating device |
Corey Willson, Timothy A. Parkinson |
2008-01-15 |
| 6377203 |
Collision arbitration method and apparatus for reading multiple radio frequency identification tags |
— |
2002-04-23 |
| 6246328 |
Extended range passive marker |
Timothy A. Parkinson |
2001-06-12 |
| 5471143 |
Apparatus for locating buried conductors using phase-shifted signals |
— |
1995-11-28 |
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Conductor locator adapter for electronic markers |
Timothy A. Parkinson |
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Induction coil driver |
— |
1990-04-03 |
