Metering pump with a protected pump chamber

Details Metering pump with a protected pump chamber Metering pump with a protected pump chamber

2008-03-12

2010-11-23

Lazo, Thomas E (Department: 3745)

Expansible chamber devices

Collapsible chamber wall portion

Wall portion formed of flexible material

Reexamination Certificate

active

07836814

ABSTRACT:
The invention provides a pump, in particular for a chemically reactive fluid, in which a pump head comprises at least two walls between which there is defined a pump chamber for pumping the fluid in question, one of the walls being stationary, the other wall being movable or deformable relative to the stationary wall by means of a drive or deformation device, at least the stationary wall being provided with a protective coating against the fluid, wherein the coating is constituted by a sheet of plastics material applied in leaktight manner against the wall at the periphery thereof, with the space between the protected surface and the coating sheet, within the zone where they make leaktight contact, being filled with an incompressible liquid.

REFERENCES:
patent: 2496711 (1950-02-01), Goddard
patent: 2753804 (1956-07-01), Goss
patent: 3000320 (1961-09-01), Ring
patent: 3212448 (1965-10-01), Johnston
patent: 3781141 (1973-12-01), Schall
patent: 3955901 (1976-05-01), Hamilton
patent: 0 214 394 (1987-03-01), None
patent: 1 134 414 (2001-09-01), None

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