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| Number | Title | Issue Date |
| 6493894 | Ultrasonic transducer with low cavitation An ultrasonic sonar transducer (10) for facilitating transmission and reception of sonar signals, particularly at high speeds. The sonar transducer includes a transducer element (12) and a transducer housing (14). The housing includes a bottom wall (34) t... | 12/17/2002 |
| 6377516 | Ultrasonic transducer with low cavitation An ultrasonic sonar transducer (10) for attachment to a water vessel that more effectively transmits and receives sonar signals even when the water vessel is traveling at high speeds. The sonar transducer includes a transducer element (12) and a transduce... | 04/23/2002 |
