(under subclass 46) Subject matter which includes means to compare and control automatically the intensity of the illumination of the incandescent standard.
(1) Note. Systems utilizing radiant energy detectors to balance by means of optical elements the detectors controlled by the intensity of light emitted by plural sources of light are elsewhere. Systems where the intensity of a light source is adjusted by optical means controlled by a radiant energy detector responsive to the light source intensity are also elsewhere classified. See the Search Class notes below.
(2) Note. A system utilizing a radiant energy detector to control an electrical lamp by electrical means where no significant optical structure is in the path between the light source tested and the radiant energy detector of the system, and no indication relating to the light emitted by the lamp is claimed and the lamp is the ultimate load of the system is elsewhere. See the Search Class notes below.
(3) Note. The testing of lamps, per se, to determine the lamp characteristics before actual use, including the intensity of light emitted per watt input is classified elsewhere (see the Search Class notes below). However, where the lamp is utilized in a testing environment of use for illumination or where temperature or intensity of light of some unknown source or other optical test is involved which includes a measurement or a subcombination not elsewhere provided, even though the measurement is of current or voltage, classification will be in Class 356.
SEE OR SEARCH THIS CLASS, SUBCLASS:
130, for refractive tests which utilize a servo-controlled device to adjust the light intensity of a beam of light used in the test. 321+, for plural beam absorption spectro-photometers which have structure to adjust the light intensity of one of the beams by automatic means.
SEE OR SEARCH CLASS
250, Radiant Energy,
204, takes systems utilizing radiant energy detectors to balance by means of optical elements the detectors controlled by the intensity of light emitted by plural sources of light; subclass 205 for systems where the intensity of a light source is adjusted by optical means controlled by a radiant energy detector responsive to the light source intensity. No indicator related to the optical properties of the light included in the claims should be classified there. See also (1) Note above.
315, Electric Lamp and Discharge Devices: Systems,
149+, will take a system utilizing a radiant energy detector to control an electrical lamp by electrical means where no significant optical structure is in the path between the light source tested and the radiant energy detector of the system, and no indication relating to the light emitted by the lamp is claimed and the lamp is the ultimate load of the system. subclass 151 for radiant energy systems responsive to a lamp to control the intensity of light from the lamp by electrical means; also see subclasses 129+. See (2) Note above.
318, Electricity: Motive Power Systems,
18+, for follow-up systems utilizing radiant energy which have as their ultimate purpose the control of an electric motor.
324, Electricity: Measuring and Testing,
403+, will take the testing of lamps, per se, to determine the lamp characteristics before actual use, including the intensity of light emitted per watt input. See the (3) Note above.
