US PATENT SUBCLASS 73 / 258
.~.~.~.~.~ Nutating piston

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}
255  DF  .~.~.~ With orbital movement {2}
257  DF  .~.~.~.~ Single stationary abutment {1}
258.~.~.~.~.~ Nutating piston

DEFINITION

Classification: 73/258

(under subclass 257) Meters wherein the axis of the piston during the orbital movement describes a conical surface. This subclass includes meters commonly termed "disk type".

SEE OR SEARCH CLASS

418, Rotary Expansible Chamber Devices,

49+, for rotary expansible chamber devices having a mutating working member.