Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4764774 | Erodible buried radio frequency transmitting and receiving antenna | Verne E. Hildebrand | 1988-08-16 |
| 4393350 | Method for rapidly detecting subterranean tunnels by detecting a non-null value of a resultant horizontal magnetic field component | Peder M. Hansen, John G. Hoffman, Wesley A. Andrew | 1983-07-12 |
| 4290020 | Method and apparatus for detecting subterranean anomalies by generating two parallel magnetic fields | Peder M. Hansen, John G. Hoffman, Wesley A. Andrew | 1981-09-15 |
| 4200873 | Folded tapered coaxial cavity-backed annular slot antenna | — | 1980-04-29 |