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:
Sep. 16, 1980
Filed:
Dec. 27, 1977
Applicant:
Inventor:
Frederic R Engstrom, Hillsboro, OR (US);
Assignee:
Tektronix, Inc., Beaverton, OR (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430 24 ; 430-5 ; 430394 ; 430396 ;
Abstract
An improved method of screening a color cathode ray tube of the shadow mask type is disclosed. The shadow mask is used to form a corresponding virtual mask on the outer or viewing surface of the CRT faceplate. The virtual mask then is employed as a substitute for the shadow mask in the subsequent photoprinting of a color display screen on the faceplates's inner surface. Advantages include reduced handling of the fragile shadow mask, which reduces the costs associated with replacing such masks if they become damaged, and better defined and registered phosphor deposits.