US PATENT SUBCLASS 73 / 1.43
.~.~ Chronometer (e.g., clock, watch, or watch unbalance)

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

1.01  DF  INSTRUMENT PROVING OR CALIBRATING {13}
1.42  DF  .~ Timing apparatus (e.g., fuse, camera, or shutter) {2}
1.43.~.~ Chronometer (e.g., clock, watch, or watch unbalance) {5}
1.44  DF  .~.~.~> Using antenna or radio frequency (RF)
1.45  DF  .~.~.~> Using optical sensor or element {2}
1.48  DF  .~.~.~> Using sound sensor or piezoelectric vibration sensor {2}
1.52  DF  .~.~.~> Plural watches
1.53  DF  .~.~.~> With resilient element {1}

DEFINITION

Classification: 73/1.43

Chronometer (e.g., clock, watch, or watch unbalance):

(under subclass 1.42) Subject matter wherein the device being proven or calibrated includes means providing a humanly perceptible indication of a passage of time.

SEE OR SEARCH CLASS

368, Horology: Time Measuring Systems or Devices, appropriate subclasses for a timer, per se.