Liquid chromatograph pump with dual cylinders and dual plungers

Details Liquid chromatograph pump with dual cylinders and dual plungers Liquid chromatograph pump with dual cylinders and dual plungers

2006-06-20

2006-06-20

Freay, Charles G. (Department: 3746)

Pumps

Successive stages

Fluid motor for one stage supplied from another stage

C417S254000, C417S265000, C417S426000, C417S044200

Reexamination Certificate

active

07063513

ABSTRACT:
In a pump for feeding a liquid for chromatography, first and second plungers form first and second volumes respectively together with first and second chambers, the first plunger is prevented from changing the first volume sufficiently for feeding the liquid between the first and second volumes when the second plunger decreases the second volume to discharge the fluid from the second volume to an outlet path of the pump for the chromatography.

REFERENCES:
patent: 1270493 (1918-06-01), Campodonico
patent: 2274224 (1942-02-01), Vickers
patent: 2373779 (1945-04-01), Ricardo
patent: 4233156 (1980-11-01), Tsukada
patent: 4600365 (1986-07-01), Riggenmann
patent: 4681513 (1987-07-01), Saito et al.
patent: 4752385 (1988-06-01), Wilson
patent: 4808077 (1989-02-01), Kan et al.
patent: 4810168 (1989-03-01), Nogami et al.
patent: 4883409 (1989-11-01), Strohmeier et al.
patent: 4980059 (1990-12-01), Barlow et al.
patent: 5324175 (1994-06-01), Sorensen et al.
patent: 5637208 (1997-06-01), Dourdeville
patent: 5653876 (1997-08-01), Funke
patent: 5852231 (1998-12-01), Kaji
patent: 5897781 (1999-04-01), Dourdeville
patent: 6099724 (2000-08-01), Dourdeville
patent: U-63-36668 (1988-03-01), None
PTO Translation 2005-036668, pp. 1-3, Oct. 5, 2004.

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