US PATENT SUBCLASS 137 / 565.23
.~.~ Vacuum pump

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

561 R  DF  SYSTEMS {32}
565.01  DF  .~ With pump {11}
565.23.~.~ Vacuum pump

DEFINITION

Classification: 137/565.23

Vacuum pump:

(under subclass 565.01) Subject matter wherein the device or machine creates a system pressure lower than the ambient pressure. [figure] [caption]Figure 1: A typical example of the subject matter. A - Vacuum chamber; B - Movable member in chamber; C - Casing with sealing liquid; E - Preliminary pump; F - Final pump.

SEE OR SEARCH CLASS

417, Pumps,

148+, for a vacuum generator.