Hydraulic pump

Details Hydraulic pump Hydraulic pump

2011-06-21

2011-06-21

Freay, Charles G (Department: 3746)

Pumps

Motor driven

Spring or weight motor

C417S337000

Reexamination Certificate

active

07963750

ABSTRACT:
A hydraulic pump comprises a moving pressing member to compress a lower reservoir to move downward, and to move upward according to the change of buoyancy by the supply and discharge of the water into an inner space of the moving pressing member. A pumping pipe transports water in the lower reservoir outside of the pump.

REFERENCES:
patent: 459280 (1891-09-01), Garrett
patent: 4286928 (1981-09-01), Clay
patent: 5988991 (1999-11-01), Tsai
patent: 7261523 (2007-08-01), Da Silva
patent: 2006/0017292 (2006-01-01), Matsubara
patent: 2006/0216163 (2006-09-01), Park
patent: 54-114807 (1979-09-01), None
patent: 57-76278 (1982-05-01), None
patent: 3-53114 (1991-05-01), None
patent: 6-336970 (1994-12-01), None
patent: 9-137481 (1997-05-01), None
patent: 2000-54946 (2000-02-01), None
patent: 2006-29277 (2006-02-01), None
English abstract of JP 6-336970 dated Dec. 6, 1994.
English abstract of JP 2006-29277 dated Feb. 2, 2006.
Patent Abstracts of Japan of JP 09-137481 dated May 27, 1997.

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