Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10123157 | Locating underground markers | Rodney Wayne Appleby, Michael Maggs, Alex Spathis | 2018-11-06 |
| 6288682 | Directional antenna assembly | Steven Gregory O'Keefe, Jun Lu | 2001-09-11 |
| 6034638 | Antennas for use in portable communications devices | Steven Gregory O'Keefe, Jun Lu | 2000-03-07 |
| 4682118 | Phase shift keying and phase modulation transmission system | — | 1987-07-21 |