US PATENT SUBCLASS 73 / 609
.~.~.~ Measuring or testing system having threshold, gating, delay, or blocking means

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

570  DF  VIBRATION {10}
584  DF  .~ By mechanical waves {13}
596  DF  .~.~ Beamed {10}
609.~.~.~ Measuring or testing system having threshold, gating, delay, or blocking means {2}
610  DF  .~.~.~.~> Electronic gating {6}
617  DF  .~.~.~.~> Having mechanical delay or mechanical blocking

DEFINITION

Classification: 73/609

Measuring or testing system having threshold, gating, delay,

or blocking means:

(under subclass 596) Subject matter having a threshold circuit, a gating circuit, delay means or blocking means to eliminate undesired signals form measuring or indicating means.

(1) Note. A delay means may be part of the gating means or a mechanical delay line between a sonic transmitter or receiver and a test body.

(2) Note. The blocking means includes an acoustic curtain between adjacent sonic transmitter and receiver means or a masking means to block off portions of an indication on a cathode-ray tube.

SEE OR SEARCH THIS CLASS, SUBCLASS:

618+, for plural gates for effecting scanning.