(under the class definition) Subject matter comprising means to modify, contain or eliminate at least some of the emanations or (or caused by, in the case of secondary emissions) a source of invisible radiation.
(1) Note. Radiation includes secondary radiation along with primary radiation which causes the secondary radiation.
(2) Note. Included in this subclass are reflective elements and systems.
(3) Note. The devices in this group include apparatus (relying on optical principles) to (1) change or select the direction or shape of all or part of the radiation, (2) change or select the intensity or amount of the radiation, (3) to select certain of the frequencies of the radiation, (4) contain all of the radiation from passing beyond the devices (5) passing the devices in a given time, (6) change the intensity in a cyclic manner in a given amount of time or (7) to eliminate or reduce certain frequencies from the radiation on a directional basis.
(4) Note. This group of subclasses include the combination of a device of this group and an indicator which, for example, shows the shape or size of an aperture, created by adjustment, the pattern cast on a plane transverse to radiation passing through an aperture or a collimator or the distance between the shutter members forming an aperture.
(5) Note. The optical principles relied upon by these devices to control radiation include transmission, reflection, refraction, diffraction and absorption.
(6) Note. Included in this subclass are diaphragms and cones which are not adjustable. SEE OR SEARCH CLASS
