Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12204062 | Marker device for underground infrastructure | Gary A. Morris | 2025-01-21 |
| 10928539 | Magneto-mechanical marker with enhanced frequency stability and signal strength | — | 2021-02-23 |
| 10763823 | Elliptically-shaped resonator markers with enhanced frequency stability and gain | Curtis L. Shoemaker, Ding Wang | 2020-09-01 |
| 10649112 | Tape format magnetoelastic resonator markers | 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 | Dean M. Dowdle, Michael E. Hamerly, William C. Egbert, Terrence H. Joyce | 2017-05-02 |
| 9013274 | Magnetomechanical markers for marking stationary assets | Dean M. Dowdle, Michael E. Hamerly, William C. Egbert, Terrence H. Joyce | 2015-04-21 |
| 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 |
| 5430379 | Conductor locator adapter for electronic markers | Timothy A. Parkinson | 1995-07-04 |
| 4914399 | Induction coil driver | — | 1990-04-03 |