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:
Aug. 30, 1988
Filed:
Jul. 02, 1986
Robert Adler, Northfield, IL (US);
Charles J Prazak, III, Elmhurst, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A shadow mask blank is disclosed for use in the manufacture of an ultra-high resolution color cathode tube. The mask blank is adapted to be expanded and secured under tension in spaced adjacency to the screen of the tube. The blank comprises a central field of electron-beam-passing apertures, an outer band adapted to be gripped during the expanding, and at least one field of selectively weakened metal between the central field and the outer band. The selectively weakened metal is effective to equalize stress and prevent wrinkling of the blank under electron beam heating when the blank is expanded and secured under tension. An inner band peripheral to the central field may be provided for mounting the blank on a support structure and securing it thereto. Means may also be provided for linking the inner band with the outer band to selectively strengthen weakened areas.