(under the class definition) Subject matter comprising systems, apparatus, and methods for testing the operativeness or characteristics of electric lamps or electric discharge devices.
(1) Note. This subclass includes, for example, systems for determining the lumen output per watt of input for electric lamps.
SEE OR SEARCH THIS CLASS, SUBCLASS:
57+, for the measurement of the resistance of lamp filaments as long as the claims are not limited to the filaments being mounted in the lamp. These subclasses (20) provide for electrical systems for testing the characteristics of incandescent lamps, including the testing of the resistance of the filament within the lamp.
378+, for this subject matter utilized to test spark plugs or ignition systems.
SEE OR SEARCH CLASS
209, Classifying, Separating, and Assorting Solids, appropriate subclasses for methods and apparatus for automatically separating and assorting, or segregating in grades or classes according to physical characteristics, lamps, and space discharge devices.
315, Electric Lamp and Discharge Devices: Systems, 120, and 129+ for systems for operating an electric lamp and/or discharge device, the systems including signal, indicator, or alarm means to indicate some condition affecting the operation of the lamp or discharge device.
356, Optics: Measuring and Testing,
121+, for lamp beam direction or pattern tests with or without focussing of the lamp; subclass 123 for tests to determine the position of a filament with respect to its
optical system; and subclasses 213+ for photometers.
445, Electric Lamp or Space Discharge Component or Device Manufacturing,
3+, for processes; and subclasses 63+ for apparatus for the manufacture of electric lamps or discharge devices which include an operation of testing or means to test the operativeness of the lamp or discharge device.
455, Telecommunications, appropriate subclasses for miscellaneous apparatus and systems for testing radio circuits.
