Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8237459 | Method of testing ground resistance by making use of existing telephone lines | Ewan G. Browne, Wayne Chappell, Paul R. Siglinger, Edwin Glenn Yancey | 2012-08-07 |
| 7170411 | Method of and system for rapidly locating all passive underground electronic marker types | James Thompson | 2007-01-30 |
| 7095231 | Method of and system for locating a single passive underground electronic marker type that distinguishes false indication caused by other marker types | James Thompson | 2006-08-22 |
| 6946850 | Method and apparatus for filtering unwanted noise while amplifying a desired signal | Paul R. Siglinger | 2005-09-20 |
| 6380857 | Self leveling underground marker | George G. Galloway, Ronald L. McWilliams, John Moss | 2002-04-30 |
| 6097293 | Passive electrical marker for underground use and method of making thereof | George G. Galloway, Ronald L. McWilliams, John Moss, Kenneth D. Napps, Sean Nash +1 more | 2000-08-01 |
| D376548 | Hand held audio test probe | Randy Denby, George G. Galloway, Ronald L. McWilliams, John Moss, Sean Nash +1 more | 1996-12-17 |
| 4834358 | Modular fixturing system | Raymond A. Okolischan, Theodore R. Metz | 1989-05-30 |
| 4832325 | Spring stop adaptor for modular fixturing | Raymond A. Okolischan, Theodore R. Metz | 1989-05-23 |