(under subclass 216) Subject matter in which the optical path between the light source and the photocell is directly affected by an object which is movable with respect to, is not part of and is not continuously associated with the photocell device.
(1) Note. The ultimate object being sensed must directly affect the light beam, and not indirectly through the medium of a linkage, shutter or other instrumentality. Further, the object must be one which is independent of the photocell apparatus in the sense of being nonintegral with it and having an independent existence of its own, regardless of the existence of the photocell apparatus.
(2) Note. Examples of such objects are animate objects such as horses on a race track, human beings entering doors, animals in traps or inanimate objects such as plants being cultivated, work pieces being gauged, paint samples being tested.
SEE OR SEARCH THIS CLASS, SUBCLASS:
231, for similar subject matter where the article indirectly affects the photocell.
554, for similar subject matter where the article is a flame and illuminates the photocell.
