Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Reexamination Certificate
2006-11-14
2006-11-14
Pihulic, Dan (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
C367S167000
Reexamination Certificate
active
07136324
ABSTRACT:
A solid metallic piston of a fluidborne sound projector is provided with a plurality of parallel spaced fluid passages extending between opposite axial end faces of the piston so as to equalize fluid pressures exerted thereon within a chamber enclosed within an end portion of a conduit having an end wall attached thereto through which a solid piston rod extends from the piston to an acoustical power source from which acoustical energy is mechanically transmitted as displacing forces applied to one of the axial end faces of the piston. Displacement of the piston within the chamber is limited in one axial direction by abutment of the rear end face thereof with the conduit end wall and in the other axial direction by abutment of a larger diameter section of the piston with a forward stop on an annular seal fixed to the conduit end portion, through which a smaller diameter section of the piston extends from the larger diameter section.
REFERENCES:
patent: 3403374 (1968-09-01), Mellen et al.
patent: 4030063 (1977-06-01), Wallen
patent: 4047148 (1977-09-01), Hagemann
patent: 4483411 (1984-11-01), Mifsud
patent: 6320281 (2001-11-01), Zakharian
patent: 6320821 (2001-11-01), Goldring et al.
Pihulic Dan
Shuster Jacob
The United States of America as represented by the Secretary of
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