Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1988-10-31
1989-11-14
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367174, 91530, 91167R, 92 65, H04R 2300
Patent
active
048812110
ABSTRACT:
A multiple frequency range hydraulic actuator includes a low frequency cylinder with a low frequency actuator piston within. The low frequency piston operates as a high frequency cylinder having a high frequency piston within. The low frequency piston, and high frequency piston operate in conjunction to generate low frequency movement. The high frequency piston operates independently to generate high frequency movement.
REFERENCES:
patent: 3653298 (1972-04-01), Bilodeau
patent: 4139733 (1979-02-01), Falkenberg
patent: 4741246 (1988-05-01), Padarev
Conoco Inc.
Eldred John Woodrow
Jordan Charles T.
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