Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5325873 | Tube placement verifier system | Richard E. Hirschi, James L. Tiefenthal, Ronald M. Isaac | 1994-07-05 |
| 5316024 | Tube placement verifier system | Richard E. Hirschi, James L. Tiefenthal, Ronald M. Isaac | 1994-05-31 |
| 4906973 | Walk-through metal detector | Mark W. Rohde | 1990-03-06 |
| 4348639 | Transmitter-receiver loop buried metal object locator with switch controlled reference voltage | — | 1982-09-07 |
| 4323847 | Oscillator type metal detector with switch controlled fixed biasing | — | 1982-04-06 |
| 4249128 | Wide pulse gated metal detector with improved noise rejection | — | 1981-02-03 |