US PATENT SUBCLASS 250 / 203.4
.~.~.~.~ Sun

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
201.1  DF  .~ Photocell controls its own optical systems {8}
203.1  DF  .~.~ Following a target (e.g., a star or instrument pointer or other object) other than a pattern {2}
203.3  DF  .~.~.~ Self-luminous target {4}
203.4.~.~.~.~ Sun

DEFINITION

Classification: 250/203.4

Sun:

(under subclass 203.3) Subject matter wherein the self-luminous target to be tracked is the Sun.

(1) Note. Since solar radiation is so intense at or near the earth's surface. Many solar trackers track a shadow cast by an object in between the sun and the photocell.

SEE OR SEARCH CLASS

126, Stoves and Furnaces,

573+, for solar heat collectors with tracking means controlled by sun position tracking sensor; and subclasses 600+ for means to reposition solar collector for optimum radiation exposure.