US PATENT SUBCLASS 123 / 90.3
.~.~ Positive rotation provided by internal means

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

90.1  DF  POPPET VALVE OPERATING MECHANISM {19}
90.28  DF  .~ With nonvalving movement (e.g., about valve stem) {2}
90.3.~.~ Positive rotation provided by internal means

DEFINITION

Classification: 123/90.3

(under subclass 90.28) Device wherein means is provided within the operating mechanism to rotate the valve.

(1) Note. A device of this subclass is often referred to as a positive rotator, and usually comprises a self-contained, insertable unit.