US PATENT SUBCLASS 400 / 339
.~.~ Using fluid or fluent-material retarder

Current as of: June, 1999
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400 /   HD   TYPEWRITING MACHINES

283  DF  CARRIAGE OR CARRIAGE-MOVING OR MOVEMENT-REGULATING MECHANISM {11}
337  DF  .~ Carriage-retarder mechanism {4}
339.~.~ Using fluid or fluent-material retarder

DEFINITION

Classification: 400/339

Using fluid or fluent-material retarder:

(under subclass 337) Subject matter wherein said movement of the carriage* is controlled by a regulator that utilizes the movement of a flowable substance as a means to control the velocity of the carriage.

(1) Note. The flowable substance used includes a gas, a liquid, or a fluent material such as sand or small particles in a device sometimes termed a "dashpot" or similar structure.