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:
Feb. 04, 1992
Filed:
Mar. 25, 1988
Applicant:
Inventor:
Jan Van Der Waal, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313403 ; 313408 ;
Abstract
A color cathode ray tube having a shadow mask comprising columns of vertically elongate apertures separated by bridges. In order to obtain smooth north and south edges to the cathodoluminescent screen and the desired mask transmission, at least some of the apertures which terminate at the top and bottom mask edges are longer and narrower than the adjacent apertures in the same column. These longer, narrower apertures are provided in those cases where normal width apertures would have been excessively foreshortened by the mask edge, for example their lengths are less than their widths, and where columns would have terminated in a bridge or a part thereof.