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:
Sep. 04, 2007
Filed:
Jun. 18, 2002
Applicant:
Fuminori Ito, Tokyo, JP;
Inventor:
Fuminori Ito, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 1/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A field emission type cold cathode, comprising a substrate having a conductivity at least on the surface thereof, an insulation layer formed on the substate and having a first opening part, a gate electrode layer formed on the insulation layer, having a center generally aligned with the center of the first opening part, and having, therein, a second opening part having an opening diameter larger than the opening diameter of the first opening part, and an emitter layer formed in the first opening part, the emitter layer characterized by further comprising the bottom surface and the side surfaces of the first opening part.