(under the class definition) Subject matter involving nonvisible radiation such as infrared and ultraviolet radiation not provided for elsewhere.
(1) Note. The subject matter of this subclass relates to apparatus and methods similar to that provided for in the other subclasses of this class, i.e., subject matter of an optical nature as would be operative with visible radiation. However, in this subclass the operation has been extended to involve the nonvisible spectrum but in an optical manner,
such as refraction and reflection in accordance with optical principles, and not provided for elsewhere, e.g., Class 374, subclasses 121+ for radiation thermometers. Class 250, especially in subclasses 336.1+ provides for apparatus with significant nonvisible radiation structure including measuring and testing of invisible radiation. Examples of significant nonvisible radiation structure for classification in Class 250 are: a source of invisible radiation such as infrared or ultraviolet, particular material operative only in the invisible radiation range, the application of the measuring or testing to subject matter or specimens responsive only to invisible radiation to carry out the measurement or test. It is emphasized that as between this Class 356 and Class 250 the general requirements for Class 356 must be also met for classification here. For example, photocell measuring circuits must claim the meter or indicator or the specimen holder for classification here. A lesser combination such as a photocell circuit would be classified in Class 250. See (1) Note under subclass 218.
(2) Note. Where one claim to measuring and testing uses only visible light in the test and another claim to measuring and testing uses only invisible radiation, the original classification is in Class 356, appropriate subclass and cross-references in Class 250, appropriate subclass.
SEE OR SEARCH CLASS
250, Radiant Energy,
336.1+, for methods and apparatus including an electric signalling device for detecting infraviolet radiation and subclasses 472.1+ for nonelectric signalling methods and apparatus responsive to infrared or ultraviolet light. See also the (1) Note to this subclass. 374, Thermal Measuring and Testing,
121+, for the detection of infrared and visible light energy to determine the temperature of a body from which the radiation is thermally emitted.
378, X-Ray or Gamma Systems or Devices, appropriate subclasses for measuring and testing using X-rays.
