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. 10, 1987
Filed:
Aug. 22, 1985
Applicant:
Inventor:
Leonard Dietch, Skokie, IL (US);
Assignee:
Zenith Electronics Corporation, Glenview, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G03B / ;
U.S. Cl.
CPC ...
350322 ; 350-11 ; 354-1 ;
Abstract
A component-in-process for use in the manufacture of a color cathode ray tube comprises a shadow mask having a pattern of minute apertures for color selection the mask according to the invention has disposed on at least one side thereof a removable film effective to prevent particle occlusion of the apertures. The film according to the invention has an extremely small, substantially uniform thickness dimension, a low index of refraction, and is of such high transparency as to exhibit a negligible optical effect during photoscreening operations. An associated manufacturing method for a cathode ray tube is also disclosed.