| Patent | Date |
|---|
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
Grant 4,868,799 - Massa * September 19, 1 | 1989-09-19 |
Directional waterproof ultrasonic transducer for operating in air
Grant 4,859,897 - Massa August 22, 1 | 1989-08-22 |
Wide-range audio frequency underwater transducer
Grant 4,763,307 - Massa August 9, 1 | 1988-08-09 |
Electromagnetic transducers for underwater low-frequency high-power use
Grant 4,745,586 - Massa May 17, 1 | 1988-05-17 |
Hydrophone design to overcome reduction in leakage resistance between electrode surface of transducer element assembly and the water in which the hydrophone is immersed
Grant 4,700,333 - Massa , et al. October 13, 1 | 1987-10-13 |
Electromagnetic transducers for underwater low-frequency high-power use
Grant 4,660,186 - Massa April 21, 1 | 1987-04-21 |
Low frequency portable lightweight sonar systems and their method of deployment for greatly increasing the efficiency of submarine surveillance over large areas
Grant 4,641,290 - Massa , et al. February 3, 1 | 1987-02-03 |
Mechanoacoustic transducer for use in transmitting high acoustic power densities into geological formations such as oil-saturated sandstone or shale
Grant 4,469,175 - Massa September 4, 1 | 1984-09-04 |
High efficiency broadband directional sonar transducer
Grant 4,439,847 - Massa March 27, 1 | 1984-03-27 |
Ultrasonic transducers
Grant 4,433,399 - Massa February 21, 1 | 1984-02-21 |
Means for detecting the accumulation of frost in a low temperature refrigeration system
Grant 4,428,206 - Massa January 31, 1 | 1984-01-31 |
Apparatus and method for the non-destructive testing of the physical integrity of a structural part
Grant 4,342,229 - Massa August 3, 1 | 1982-08-03 |
Mechanoacoustic transducer for use in transmitting high acoustic power densities into geological formations such as oil-saturated sandstone or shale
Grant 4,332,017 - Massa May 25, 1 | 1982-05-25 |
Low-frequency directional sonar systems
Grant 4,305,141 - Massa December 8, 1 | 1981-12-08 |
Low frequency sonar systems
Grant 4,305,140 - Massa December 8, 1 | 1981-12-08 |
System for precisely and economically adjusting the resonance frequence of electroacoustic transducers
Grant 4,281,484 - Massa August 4, 1 | 1981-08-04 |
Sonic ranging systems to eliminate errors due to variations in the sound velocity in the medium
Grant 4,210,969 - Massa July 1, 1 | 1980-07-01 |
Directional energy receiving systems for use in the automatic indication of the direction of arrival of the received signal
Grant 4,198,705 - Massa April 15, 1 | 1980-04-15 |
Electroacoustic transducers of the bi-laminar flexural vibrating type with an acoustic delay line
Grant 4,190,783 - Massa February 26, 1 | 1980-02-26 |
Piezoelectric electroacoustic transducers of the bi-laminar flexural vibrating type
Grant 4,190,784 - Massa February 26, 1 | 1980-02-26 |
Manufacture of electroacoustic transducers which require molding an elastomer to the surface of the transducer material
Grant 4,128,370 - Massa December 5, 1 | 1978-12-05 |
Automatic camera focusing means
Grant 4,103,309 - Massa July 25, 1 | 1978-07-25 |
Coin-operated vending systems
Grant 4,096,933 - Massa June 27, 1 | 1978-06-27 |
Underwater depth sounder with variable beam transducer
Grant 4,084,150 - Massa April 11, 1 | 1978-04-11 |
Automatic leakage detection system for pipelines carrying fluids
Grant 4,066,095 - Massa January 3, 1 | 1978-01-03 |
Electroacoustic transducer design for eliminating phantom target errors in sound ranging systems
Grant 4,050,056 - Massa September 20, 1 | 1977-09-20 |
Ultrasonic microphone for operating with an accumulated layer of mud over its vibratile surface without change in sensitivity within its prescribed frequency range
Grant 4,033,180 - Massa July 5, 1 | 1977-07-05 |
Ultrasonic transducer with improved transient response and method for utilizing transducer to increase accuracy of measurement of an ultrasonic flow meter
Grant 4,011,473 - Massa March 8, 1 | 1977-03-08 |
Dual electroacoustic transducers
Grant 3,949,349 - Massa , et al. April 6, 1 | 1976-04-06 |
Electroacoustic transducers of the bilaminar flexural vibrating type and method for manufacturing same
Grant 3,937,991 - Massa , et al. February 10, 1 | 1976-02-10 |
Directional ultrasonic transducer with reduced secondary lobes
Grant 3,928,777 - Massa December 23, 1 | 1975-12-23 |
Aircraft Ground Traffic Control System
Grant 3,855,571 - Massa December 17, 1 | 1974-12-17 |
Electroacoustic Transducer With Controlled Beam Pattern
Grant 3,849,679 - Massa November 19, 1 | 1974-11-19 |
Apparatus And Method For Sonic Cleaning Of Human Teeth
Grant 3,847,662 - Massa November 12, 1 | 1974-11-12 |
Means For Making Precision Microadjustments In The Position Of A Movable Element
Grant 3,808,488 - Massa April 30, 1 | 1974-04-30 |
Electrodynamic Transducer For Low Frequency Broad Band Underwater Use
Grant 3,803,547 - Massa April 9, 1 | 1974-04-09 |
Electroacoustic Transducers
Grant 3,752,941 - Massa , et al. August 14, 1 | 1973-08-14 |
Mounting Structure For Spherical Shaped Underwater Transducer
Grant 3,716,827 - Massa February 13, 1 | 1973-02-13 |
Electroacoustic Transducer With Improved Shock Resistance
Grant 3,716,828 - Massa February 13, 1 | 1973-02-13 |
High Power, Low Frequency Underwater Transducer Array
Grant 3,715,711 - Massa February 6, 1 | 1973-02-06 |
Electroacoustic Transducers Of The Bilaminar Flexural Vibrating Type
Grant 3,707,131 - Massa December 26, 1 | 1972-12-26 |
Electroacoustic Massager For The Gums
Grant 3,651,576 - Massa March 28, 1 | 1972-03-28 |
Sonar Ranging System For Locating Submerged Objects
Grant 3,579,181 - Massa May 18, 1 | 1971-05-18 |
Electroacoustic Transducers Of The Bilaminar Flexural Vibrating Type
Grant 3,578,995 - Massa May 18, 1 | 1971-05-18 |
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