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:
Jun. 24, 1986
Filed:
Feb. 14, 1984
Applicant:
Inventors:
Chuhei Oshima, Sakura, JP;
Yoshio Ishizawa, Sakura, JP;
Assignee:
National Institute for Researches in Inorganic Materials, Ibaraki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ; H01J / ; H01J / ;
U.S. Cl.
CPC ...
313341 ; 313336 ; 313337 ; 315-1 ;
Abstract
A field emission type electron gun comprises a cathode, a plurality of anodes opposing in series to the cathode and a filament for heating the anodes, all being contained in a vacuum tube. The filament is placed immediately before a first anode directly opposing the cathode in a symmetrical manner so as to serve both as a gas expelling member and as an anode.