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:
Feb. 08, 1994
Filed:
Apr. 20, 1993
Applicant:
Inventors:
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ; H01L / ; H01J / ;
U.S. Cl.
CPC ...
257 10 ; 257 11 ; 3133 / ; 313366 ;
Abstract
An electron emitting device is provided for use in a flat display, an electron beam drawing apparatus, a CRT display and so on. The electron emitting device comprises a first layer having a first bandgap, a second layer formed on the first layer and having the first bandgap, a third layer formed on the second layer and having a second bandgap, which is narrower than the first bandgap, and a fourth layer formed on the third layer and having an electron emitting surface. According to this structure, a high electron emission efficiency can be obtained.
Tsukamoto, Takeo. (1994). Electron emitting device, electron emitting apparatus and electron beam (U.S. Patent No. 5285079). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5285079
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile