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:
Oct. 30, 1990
Filed:
Mar. 09, 1989
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ; H01J / ; H05B / ;
U.S. Cl.
CPC ...
315 56 ; 315 59 ; 315205 ; 313619 ; 313620 ; 313634 ; 313642 ;
Abstract
A negative glow discharge lamp of small size comprising a cylindrical discharge container enclosing at least rare gas, a hot cathode disposed in the discharge container and coated with a thermion radiation matter, and an anode disposed in a negative glow domain formed between the anode and the hot cathode in the discharge container. In the discharge lamp, the outer diameter D (mm) of the discharge container is selected to satisfy the relation