US PATENT SUBCLASS 73 / 261
.~.~.~ With interengaging pistons


Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

861  DF  VOLUME OR RATE OF FLOW {23}
232  DF  .~ Expansible chamber {6}
253  DF  .~.~ Rotary piston or cylinder {5}
261.~.~.~ With interengaging pistons


DEFINITION

Classification: 73/261

(under subclass 253) Rotary piston meters, having at least two pistons mounted in a common cylinder and having interengaging portions so that each may act as an abutment for the other.

(1) Note. This subclass includes meters of the "Roots blower" or lobed impeller type.

SEE OR SEARCH CLASS

418, Rotary Expansible Chamber Devices,

166+, for rotary expansible chamber devices of the moving cylinder type having intermeshing peripheral surfaces; subclasses 172+, for such devices of the moving cylinder type having interengaging peripheral surfaces and subclasses 191+, for such devices having interengaging rotating members.