US PATENT SUBCLASS 701 / 4
.~.~ Altitude or attitude control or indication

Current as of: June, 1999
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701 /   HD   DATA PROCESSING: VEHICLES, NAVIGATION, AND RELATIVE LOCATION

1  DF  VEHICLE CONTROL, GUIDANCE, OPERATION, OR INDICATION {19}
3  DF  .~ Aeronautical vehicle {4}
4.~.~ Altitude or attitude control or indication {6}
5  DF  .~.~.~> Rate of change (e.g., ascent, decent) {1}
7  DF  .~.~.~> Air speed or velocity measurement
8  DF  .~.~.~> Threshold or reference value {1}
10  DF  .~.~.~> Compensation for environmental conditions
11  DF  .~.~.~> Auto pilot {1}
13  DF  .~.~.~> Spacecraft or satellite

DEFINITION

Classification: 701/4

Altitude or attitude control or indication:

(under subclass 3) Aeronautical vehicle control or indication wherein the data processing system or calculating computer functions to control or maintain the orientation of an airborne or space vehicle with respect to a reference plane.