US PATENT SUBCLASS 417 / 421
.~.~ Trapped air motor seal (i.e., diving bell type)

Current as of: June, 1999
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417 /   HD   PUMPS

321  DF  MOTOR DRIVEN {32}
410.1  DF  .~ Electric or magnetic motor {10}
421.~.~ Trapped air motor seal (i.e., diving bell type)

DEFINITION

Classification: 417/421

Apparatus under subclasses 410.1+ in which the electric

driving motor is sealed from the pump fluid by means of air trapped inside the motor casing, such as in a diving bell.