Abstract: A filter screen for a video display terminal is formed by ablating a sheet of plastic material with an excimer laser beam to produce desired apertures in the sheet spaced by webs of the sheet material. The filter screen formed in this manner can produce clean cut apertures in the sheet material and the retained material or webs between the apertures can be reduced to small dimensions because of the control of the laser beam. The sheet material can be coated for optical reflection control and for radiation control either before or after formation as the filter screen. The filter screen and the method for its formation is disclosed.

Abstract: A removable conforming video display terminal filter is disclosed. The combination of a filter element and a filter bezel is adapted to be added to a video display terminal that does not have an installed filter. The filter and bezel are adapted to be mounted to the terminal without opening the enclosure of the terminal. The filter conforms to the face of the cathode ray tube and the bezel presses the filter against the face. The filter bezel may be adapted with hanger means that permit the filter and bezel to be removably attached to the terminal. The filter is capable of reducing or eliminating both glare and radiation from the terminal and the filter is adapted to be grounded to a suitable ground circuit.

Abstract: Described is an improved Temperature Measuring Device which is controllably activatable prior to the making of a temperature measurement from a passive to an active mode; and whose physical display of temperature indication is irreversible, providing a permanent, fixed display as desired. This device consists of a tube which has a reservoir, a rise tube and a means of or a device for creating a discontinuity in the rise tube or between the rise tube and the reservoir. The reservoir contains a solution, the chemical or physical action of which is the basis for the temperature measurement. The rise tube is a containment for the solution when the solution experiences (thermal) expansion or contraction. The means of, or device for, discontinuity is used to impede the expansion or contraction between the reservoir and the rise tube or within the rise tube embodiment.