US PATENT SUBCLASS 356 / 218
.~ Photoelectric

Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

213  DF  PHOTOMETERS {9}
218.~ Photoelectric {9}
219  DF  .~.~> Simultaneous sighting and reading measurement
220  DF  .~.~> Multiple housings
221  DF  .~.~> Responsive to incident or back lighting
222  DF  .~.~> Plural detectors
223  DF  .~.~> Logarithmic
224  DF  .~.~> Multisensitivity range
225  DF  .~.~> With predetector light modifier (e.g., diaphragm)
226  DF  .~.~> Detector and indicator electrical coupling (e.g., amplifying or attenuating)
227  DF  .~.~> With particular indicator {1}

DEFINITION

Classification: 356/218

(under subclass 213) including a light responsive device which may be photo-resistive or photovoltaic together with an electrical meter or other electrical indicating device electrically coupled to the light responsive device to indicate quantitatively the change produced by light infringing on the light responsive device.

(1) Note. This subclass provides for the combination of the photocell, electrical coupling between the photocell and meter, and the meter. Class 250, Radiant Energy, subclasses 206+ provides for photocells and their controlled circuits, and subclasses 216+ for photocells together with optical systems. Class 324, Electricity: Measuring and Testing, especially subclasses 92 through 157 provides for galvanometer type meters with or without associated circuitry. Class 340, Communications: Electrical, subclass

600 provides for radiant energy indicators of the presence or absence type as opposed to the quantitative values furnished by the patents in this subclass 218. Class 116, Signals and Indicators, subclasses 284+ provides for rotary indicators generally, and subclasses 327+ for pointers and indicator arms.

SEE OR SEARCH THIS CLASS, SUBCLASS:

52+, for photoelectric egg candlers.

124+, for optical element or device testing of the photoelectric type.

139.01+, for devices measuring the angle with respect to a remote point having specified applications with photodetection. 141.1+, for devices measuring the apex of an angle at a photodetection station with respect to a remote point.

152.1+, for devices measuring the apex of an angle at a point remote from a photodetection station.

237.1+, for photoelectric flaw detection.

364+, for polarization testing devices of the photosensitive type.

372+, for photoelectric mensuration or configuration comparison devices.

402+, for colorimeters of the photoelectric type.

432+, for photoelectric devices testing light transmission through substances.

445+, for photoelectric devices testing light reflection from surfaces.

SEE OR SEARCH CLASS

116, Signals and Indicators. See (1) Note above.

136, Batteries: Thermoelectric and Photoelectric,

243+, for photoelectric type primary batteries. 250, Radiant Energy. See (1) Note above.

313, Electric Lamp and Discharge Devices,

94+, for photosensitive devices, and subclasses 103+ for photosensitive devices having secondary emitters.

324, Electricity: Measuring and Testing,

96+, for photometers to determine electric quantities. See (1) Note above.

340, Communications: Electrical. See (1) Note above.