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:
Dec. 30, 2008
Filed:
Jan. 27, 2006
Applicants:
Yoichi Ito, Mobara, JP;
Satoshi Muto, Mobara, JP;
Inventors:
Yoichi Ito, Mobara, JP;
Satoshi Muto, Mobara, JP;
Assignee:
Hitachi Displays, Ltd., Mobara-shi, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 41/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A correction filter used in the exposure for forming a phosphor screen includes three kinds of correction filters consisting of a grading filter, a monochroic local correction filter and a multi-color local correction filter. With the use of three kinds of correction filters, it is possible to improve the whiteness uniformity which may be degraded due to the wall thickness difference at the center and a peripheral portion of a panel portion of a flat-face-type color cathode ray tube.