Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4782910 | Bi-polar bender transducer for logging tools | — | 1988-11-08 |
| 4709360 | Hydrophone transducer with negative feedback system | Robert J. Martin | 1987-11-24 |
| 4228532 | Piezoelectric transducer | — | 1980-10-14 |
| 4183017 | Alarm buzzer apparatus | — | 1980-01-08 |