Patents & Abstracts

1. Process of Forming Cathode Ray Tube Screens to Utilize the Luminous Efficiency of the Phosphor Material, # 3,697,301 , 10/10/72, Donofrio & Rehkopf

A process of forming the cathodoluminescent screen of a cathode ray tube wherein the characteristics of the phosphor material, i.e., particle density, bulk density, atomic weight, atomic number and average particle size are related in a manner to provide a screen having a prescribed phosphor screen weight and thickness to effect efficient utilization of the luminescent brightness of the respective phosphor material when excited by subsequent electron beam impingement.

2. Process of Forming Cathode Ray Tube Screens, # 3,953,621, 4/27/76, Donofrio

An improved process is provided for forming at least one set of elements of a patterned CRT screen disposed in overlay relationship upon an opaquely defined windowed-webbing priorly applied to the interior surface of the tube viewing panel in accordance with an apertured mask. The invention concerns the placement of a reflective medium over the exterior surface of the panel during screen exposure. By this means the exposure radiation traversing the screen and panel is reflected back through the respective windows in the screen structure to augment the polymerization and adherence of the pattern elements.

3. CRT Incorporating Xray Means, # 4,485,329, 11/27/84, Donofrio, Fisher & Rollason

A cathode ray tube has discrete x-ray absorbing means integrally associated with the face region thereof to beneficially attenuate the x-radiation emanating peripherally and forwardly therefrom. Attached to the tube face is a closed frame-like resilient gasket impregnated with x-ray absorbing material. Superposed thereon is a cover plate of x-ray absorbing glass. This is adhered to the tube face by a layer of substantially transparent adhesive confined within the gasket.

4. Surface Reflectivity Device & Method, # 4,552,459, 11/12/85, Brennesholtz & Donofrio

A device and method for measuring the reflectivity of the tungsten oxide surface coating on cathode ray tube heaters are described, in which selected small areas of an illuminated heater wire turns are scanned by a microscope, and the collected reflected light converted to voltage values by a photomultiplier tube and compared to a standard value.

5. CRT Base, # 4,618,206 , 10/21/86, Donofrio & Puhak

The invention provides means for achieving improved adherence between the terminal closure portion of a cathode ray tube and its associated base member. The improvement relates to the forming of a circular array of discretely fashioned spatially related indents or pocket-like reservoirs in the flange portion of the base member. These indents accommodate the advantageous deposition of additional dielectric adhesive in the peripheral region of the flange to realize the desired tube-to-base adherence.

6. Monochrome CRT with Interference Filter Having Layer with Reduced Transmission and Projection Color TV Incorporating same, # 5,065,071, 11/12/91, Donofrio & Van der Voort

The bulls-eye effect produced by projection television cathode ray display tubes with convexly curved faceplates and multi-layer interference filters is compensated by increasing the optical absorption of one of the filter layers having a decreasing center-to-edge thickness gradient. Since the layer is thicker in the center, more attenuation of the light output occurs there than at the edges of the display window, resulting in improved luminance uniformity of the display.

7. Color Reference CRT and Method of Making, # 5,122,708, 6/14/92, Donofrio

A color reference CRT of the type employing a screen of a pattern of individual phosphor elements of different color components, is produced by adjusting the screen weights of the different color components to achieve the desired reference color when the screen is scanned by an electron beam of predetermined beam current and anode potential.

8. Color Reference CRT and Method of Making, # 5,213,918, 5/25/93, Donofrio

A color reference CRT of the type employing a screen of a pattern of individual phosphor elements of different color components, is produced by adjusting the screen weights of the different color components to achieve the desired reference color when the screen is scanned by an electron beam of predetermined beam current and anode potential.

9. Cathode Ray Tube with UV-Reflective Filter and UV-Excitable Phosphor, #5,569,977, 10/29/96 Donofrio

Output and/or perceived persistence of visible light from a cathode ray tube is improved by incorporating a UV-excitable phosphor into the screen, and by placing a UV-reflective filter on the inside of the display panel prior to formation of the phosphor screen, so that UV light emitted from the screen upon excitation by the tube's electron beam(s) is reflected back onto the screen to excite the further emission of visible light.

10. Phosphor Screen including a non-pigmented phosphor and RGB phosphor elements for a CRT, #5,798,607, 8/25/98 Donofrio

The brightness of a color CRT with a pigmented phosphor screen is improved by providing a composite layered screen in which a first layer of the composite layer is a relatively thin, heavily pigmented layer and a second is non-pigmented.

11. Monochrome CRT having curved display window with reduced transmission and projection color TV incorporating same, #5,903,089, 5/11/99, Donofrio, Robert L. and van der Voort, Andre A.

The bulls-eye effect produced in the projected image by projection television cathode ray display tubes with convexly curved faceplates and multi-layer interference filters is compensated by using darkened or tinted glass. Since the faceplate glass is thicker in the center, more attenuation of the light output occurs there than at the edges of the display window where the glass is thinner, resulting in improved luminance uniformity of the display.

12. Method for producing phosphor screens, and color cathode ray tubes incorporating same. # 6,013,978 , Jan 11th, 2000, Donofrio, Robert L.

Adherence of the phosphor screen to the face panel of a color cathode ray tube is improved by placing a UV-reflective filter on the inside of the face panel prior to photolithographic forming of the screen, in order to reflect transmitted UV light back onto those areas from which the light emerged, thereby effectively increasing the exposure dosage of those areas.

13. Method for producing phosphor screens, and color cathode ray tubes incorporating same. # 6,074,789 , June 13th, 2000, Donofrio, Robert L.

A method for improving the adherence of a phosphor screen to the face panel of a color cathode ray tube involves placing a UV reflective filter on the inside of the face panel prior to photolithographic forming of the screen, in order to reflect transmitted UV light back onto those areas form which the light emerged, thereby effectively increasing the exposure dosage of those areas.