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:
May. 30, 1989
Filed:
Mar. 11, 1987
Applicant:
Inventors:
Tooru Mizuno, Nagoya, JP;
Shinichi Kiribayashi, Anjo, JP;
Assignee:
Nippondenso Co., Ltd., Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09F / ;
U.S. Cl.
CPC ...
3151691 ; 3151694 ; 340767 ;
Abstract
A fluorescent display tube drive apparatus of the type used with a vehicle instrument panel or the like. The apparatus includes a transparent electrode arranged opposite to anodes and filaments. Ac voltages are applied to the filaments for the emission of thermoelectrons and a pulsating voltage is applied to the transparent electrode to cause pulsation of the potential difference between the filaments and the transparent electrode, thereby causing the thermoelectrons to impinge uniformly on the anodes.