The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 1987
Filed:
Feb. 04, 1986
Robert E Dodds, San Diego, CA (US);
David S Goodwin, Poway, CA (US);
Himanshu M Patel, Escondido, CA (US);
Sony Corporation, Tokyo, JP;
Abstract
A method for manufacturing a color cathode ray tube, and in particular, for conditioning the surface of a panel of a color cathode ray tube to prepare it for the application of a pattern of color phosphors while minimizing the effects of reflections from interfaces in the panel. The method consists of coating a reciprocity-failing photoresist layer on the inner surface of the panel, drying the layer with a stream of low dew point air, exposing the layer to actinic radiation through a patterned mask to provide insoluble polymerized areas in preselected portions of the layer, developing the layer with a developing solution to remove unpolymerized areas while leaving the polmerized areas, applying an aqueous suspension of light absorptive material to the panel to replace the developing solution with the light absorptive material, drying the light absorptive material, applying an oxidizing solution to the panel to cause the polymerized areas to become water soluble, and removing the polymerized areas and the light absorptive material before applying the phosphors.