US PATENT SUBCLASS 73 / 521
.~ Fluid

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


73 /   HD   MEASURING AND TESTING

488  DF  SPEED, VELOCITY, OR ACCELERATION {29}
521.~ Fluid {4}
522  DF  .~.~> Dampening means
523  DF  .~.~> Expansible chamber devices
524  DF  .~.~> Fluid coupling or torque convertor type
525  DF  .~.~> Brake (e.g., vanes in air)

DEFINITION

Classification: 73/521

(under subclass 488) Apparatus in which a fluid is used.

SEE OR SEARCH CLASS

60, Power Plants,

325+, for a device in which a hydraulic actuator is supplied by fluid directly by the operation of a pump or its equivalent.

91, Motors: Expansible Chamber Type,

435, and see the search there noted for expansible chamber motors having speed responsive control. 123, Internal-Combustion Engines,

378+, for a speed controller of the pneumatic type for an internal-combustion engine.

137, Fluid Handling,

34, and 36 for a prime mover speed controller using fluid pressure; and subclass 58 for a valve controlled by a speed actuated servo-motor.