| 12049023 |
Instrument for direct measurement of air content in a liquid using a resonant electroacoustic transducer |
Dawn F. Stancavish, Nathan A. Tregger, Mark F. Roberts, David F. Myers, Stephen P. Klaus |
2024-07-30 |
| 8320218 |
Hidden ultrasonic transducer with beam angle control for non-contact target detection systems |
— |
2012-11-27 |
| 8085621 |
Ultrasonic transducer with improved method of beam angle control |
— |
2011-12-27 |
| 5729507 |
Directional energy receiving systems for use in the indication of the direction of arrival of the received signal |
Frank Massa |
1998-03-17 |
| 4868799 |
Means for equalizing the internal pressure in an underwater transducer employing a vibratile piston to permit operation of the transducer at water depths in excess of a few hundred feet |
— |
1989-09-19 |
| 4769795 |
Method of making an underwater electroacoustic transducer with long-lasting high leakage resistance |
Frank Massa |
1988-09-06 |
| 4700333 |
Hydrophone design to overcome reduction in leakage resistance between electrode surface of transducer element assembly and the water in which the hydrophone is immersed |
Frank Massa |
1987-10-13 |
| 4641290 |
Low frequency portable lightweight sonar systems and their method of deployment for greatly increasing the efficiency of submarine surveillance over large areas |
Frank Massa |
1987-02-03 |
| 4450436 |
Acoustic alarm repeater system |
— |
1984-05-22 |
| 4189719 |
Intrusion alarm systems |
James Gregory Hall |
1980-02-19 |