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:
Nov. 02, 2004
Filed:
Jul. 25, 2002
Applicant:
Inventors:
Shin-ichiro Hatta, Nara, JP;
Ryuichi Murai, Toyonaka, JP;
Hiroshi Iwamoto, Osaka, JP;
Shigeo Nakatera, Hirakata, JP;
Masaki Kawasaki, Toyonaka, JP;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 2/902 ;
U.S. Cl.
CPC ...
H01J 2/902 ;
Abstract
In the structure of the present invention, there can be provided a cathode ray tube in which deviation in the trajectory of the electron beams by the leakage magnetic field from the mask frame ( ) is decreased by using a polygonal mask frame ( ) in which the relative magnetic permeability of longer side members ( ) out of two side members adjacent to each other at the joint portion of the mask frame ( ) is the same as or larger than the relative magnetic permeability of the other side members ( ). Thus, the significance of the present invention in industrial terms is large.