US PATENT SUBCLASS 123 / 90.65
.~ Spring

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

90.1  DF  POPPET VALVE OPERATING MECHANISM {19}
90.65.~ Spring {2}
90.66  DF  .~.~> Attenuated
90.67  DF  .~.~> Seat and retainer

DEFINITION

Classification: 123/90.65

(under subclass 90.1) Device comprising a resilient element which is utilized to bias a valve toward its normal (usually closed) position.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

337, for a valve spring and for means for associating a

spring with a valve where the valve is of more general utility.

267, Spring Devices, appropriate subclasses for a spring device of more general utility.