US PATENT SUBCLASS 73 / 507
.~ Comparison to a fixed standard, master or reference speed device

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

488  DF  SPEED, VELOCITY, OR ACCELERATION {29}
507.~ Comparison to a fixed standard, master or reference speed device

DEFINITION

Classification: 73/507

(under subclass 488) Apparatus for comparing the speed of one device with that of another.

SEE OR SEARCH THIS CLASS, SUBCLASS:

1.37, for means proving or calibrating a speed, velocity, or acceleration.

SEE OR SEARCH CLASS

318, Electricity: Motive Power Systems,

68+, for the relative speed control of plural electric motors.

324, Electricity: Measuring and Testing, 161, for an electrical device for measuring speed by comparison to a reference.

361, Electricity: Electrical Systems and Devices,

242+, for the synchronization of shafts by electrical means.

388, Electricity: Motor Control Systems,

800+, for single motor running-speed control systems with feedback.

416, Fluid Reacting Surfaces (i.e., Impellers),

35, for electrical control means comparing and reducing error related to a preset datum.