Liquid chromatography pump

Details Liquid chromatography pump Liquid chromatography pump

1981-02-09

1984-05-15

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

F04B 4906

Patent

active

RE0315869

ABSTRACT:
A fluid pump mechanism for delivering a smooth output of fluids to a system utilizing at least one piston in a chamber reciprocative therewithin. The piston has strokes that fill and empty the chamber in conjunction with the action of valve means located at the inlet and outlet of the chamber. Motive means causes reciprocation of the piston within the chamber. Control means is also included for minimizing the time during the piston cycle in which the piston is not emptying the chamber. The invention's scope also encompasses a pressure metering device for a fluid forcing means motivated by an electrical motor.

REFERENCES:
patent: 3787882 (1974-01-01), Fillmore
patent: 3847507 (1974-12-01), Sakiyama
patent: 3855129 (1974-12-01), Abrahams
patent: 3855515 (1974-12-01), Hutchins, Jr.
patent: 3917531 (1975-11-01), Magnussen
patent: 3932067 (1976-01-01), Ball
patent: 4024864 (1977-05-01), Davies
patent: 4045343 (1977-08-01), Achener et al.
patent: 4108574 (1978-08-01), Bartley
patent: 4137011 (1979-01-01), Rock

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