(under the class definition) Devices which are provided with means responsive to invisible radiant energy other than ultraviolet rays or heat rays or radio waves, for altering the operation of the device.
(1) Note. Such rays may be protons, alpha particles, X-rays, gamma rays, cosmic rays or similar ray energy.
(2) Note. Many discharge devices having an envelope and a confined gas or vapor atmosphere may be used as Geiger-Mueller counter tubes. This subclass is limited to devices which include some structure which is especially provided because the device is responsive to the invisible ray energy and to discharge devices which are claimed as being Geiger-Mueller counter tubes. For other types of gas or vapor discharge devices see subclasses 182+, and the subclasses specified in the notes thereto.
SEE OR SEARCH THIS CLASS, SUBCLASS:
54, for devices within the class definition which include a radioactive material.
103+, for devices within the class definition having an electrode which is secondarily emissive, i.e., which emits secondary electrons when bombarded by primary electrons from another source.
523+, for photosensitive devices within the class definition. Especially see indented subclass 539 for those which are designed to be responsive to radiant energy, (ultraviolet or heat rays or visible light) of particular wave lengths. 539, see reference to subclasses 523+, above.
