(under subclass 492.2) Subject matter including using electrons emitted from photoemissive electrode irradiated by another source of electromagnetic radiation such as ultraviolet light.
(1) Note. Subject matter of this subclass may include, for example, mask and deflection coils between the photocathode and object.
SEE OR SEARCH THIS CLASS, SUBCLASS:
492.1, for irradiation of such devices with ultraviolet and infrared radiation.
492.2, for irradiation of semiconductor devices by electrons other than from a photocathode.
