US PATENT SUBCLASS 250 / 237 R
.~.~ Hoods, grating, baffles, diaphragms, masks

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

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
216  DF  .~ Optical or pre-photocell system {11}
237 R.~.~ Hoods, grating, baffles, diaphragms, masks {1}
237 G  DF  .~.~.~> Gratings (moire fringes)

Unofficial Alpha Subclasses: R G

DEFINITION

Classification: 250/237

(under subclass 216) Subject matter having a hood, grating, baffle, diaphragm or mask associated with the optical path between light source and photocell.

SEE OR SEARCH THIS CLASS, SUBCLASS:

229+, for similar subject matter where the means associated with the optical path between light source and photocell are ajdustable.