US PATENT SUBCLASS 244 / 97
.~.~ Buoyancy varying


Current as of: June, 1999
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244 /   HD   AERONAUTICS

75 R  DF  AIRCRAFT CONTROL {8}
96  DF  .~ Airship control {3}
97.~.~ Buoyancy varying


DEFINITION

Classification: 244/97

(under subclass 96) Devices and arrangements for controlling lighter-than-air craft by changing the buoyancy of all or part of the craft with respect to the surrounding air.

(1) Note. Devices for compressing or expanding one or more gas cells to alter their buoyancy, are found in this subclass.