Apparatus for delivering fluid at a controlled rate and pressure

Details Apparatus for delivering fluid at a controlled rate and pressure Apparatus for delivering fluid at a controlled rate and pressure

1996-04-02

1998-02-24

Kaufman, Joseph

Dispensing

Processes of dispensing

222334, 222340, 222386, 222389, 417488, G01F 1100

Patent

active

057204152

ABSTRACT:
An apparatus for delivering fluid to a site at a controlled rate and pressure, which comprises a housing enveloping three interconnected chambers comprising a first end chamber, a connecting chamber and a second end chamber, an inlet port and an outlet port each located in a side wall of the connecting chamber, each of the inlet port and the outlet port being associated with a valve for opening and closing the respective port; a first piston positioned within the first end chamber and a second piston positioned within the second end chamber, each of said pistons having a head with an inwardly facing surface having a periphery which fits snugly within the corresponding end chamber to form a fluid-tight seal with the at least one side wall of the end chamber, wherein at least a portion of a side wall of the connecting chamber intrudes inwardly to provide a stop for the head of each piston; and a closure to close the open end of each end chamber.

REFERENCES:
patent: 118206 (1871-08-01), Crowell
patent: 2621853 (1952-12-01), Bollerup
patent: 2708600 (1955-05-01), Froidevaux
patent: 2867375 (1959-01-01), Petersen
patent: 3212684 (1965-10-01), Svensson et al.
patent: 4941808 (1990-07-01), Qureshi et al.
patent: 5322418 (1994-06-01), Comer
patent: 5630709 (1997-05-01), Bar-Cohen

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