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:
Aug. 30, 1977
Filed:
Jun. 10, 1976
Applicant:
Inventors:
Takao Kishino, Mobara, JA;
Yukihiko Utamura, Mobara, JA;
Assignee:
Futaba Denshi Kogyo K. K., , JA;
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ; H01J / ;
U.S. Cl.
CPC ...
313497 ; 313294 ; 313302 ;
Abstract
A multi-digit fluorescent display tube is disclosed. The display tube includes a plurality of indicating patterns arranged in a row in spaced side-by-side relational along the longitudinal width of a substrate, a filament stretched along the longitudinal direction of the indicating patterns and a control grid disposed between the filament and the indicating pattern, wherein the control grid is positioned in different plane distances with respect to the filament so as to adjust the perveance in each of the indicating patterns and to obtain an uniform brightness of the indicating patterns.