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. 23, 1993
Filed:
May. 16, 1991
Applicant:
Inventors:
Shigeo Itoh, Mobara, JP;
Teruo Watanabe, Mobara, JP;
Hisashi Nakata, Mobara, JP;
Toshinori Takagi, Mobara, JP;
Assignee:
Futaba Denshi Kogyo Kabushiki Kaisha, Mobara, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
3151691 ; 315334 ; 315337 ; 313309 ; 313336 ; 313351 ;
Abstract
An electron emitting element capable of preventing pollution of the emitter due to absorption of gas thereon, to thereby ensure stable emission of electrons over a long period of time even in a low vacuum atmosphere. The electron emitting element is constructed so as to permit a part of electrons emitted from one of emitters to impinge on the other of the emitters being ready for emission to clean it.