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:
Jul. 12, 1988
Filed:
Dec. 31, 1986
Johann Steiner, Des Plaines, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A process for pre-treating a metal foil shadow mask is disclosed for use in a cathode ray tube wherein the shadow mask is maintained under high tension within said cathode ray tube, and wherein the mask is subjected to predetermined relatively high temperatures during tube manufacture. The process according to the invention comprises pre-heating the shadow mask in a predetermined cycle of temperature and time effective to minimize subsequent permanent dimensional changes in the mask that occur when it is subjected to the predetermined relatively high temperatures, but ineffective to significantly reduce the tensile strength of the mask by annealing.