Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5274606 | Circuit for echo and noise suppression of accoustic signals transmitted through a drill string | Douglas S. Drumheller | 1993-12-28 |
| 5135342 | Tamper proof fastening apparatus | — | 1992-08-04 |
| 5065110 | Feed-forward amplifier including phase correction | Stephen Ludvik, Victor Steel | 1991-11-12 |
| 4522521 | Printer stand including storage area for fanfold paper | — | 1985-06-11 |