Patents Assigned to D. P. Massa
  • Method of making an underwater electroacoustic transducer with long-lasting high leakage resistance
    Patent number: 4769795
    Abstract: The insulation resistance between the electroded surfaces of an underwater transducer and the water within which the transducer is immersed is greatly improved by coating the electroded surface of the transducer with a layer of air-free, high-resistance waterproof material before bonding an elastomer covering over the assembly to serve as the outer housing.
    Type: Grant
    Filed: July 20, 1987
    Date of Patent: September 6, 1988
    Assignees: F. Massa, D. P. Massa, G. M. Kurlat
    Inventors: Frank Massa, Donald P. Massa