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:
Jan. 22, 1985
Filed:
Sep. 07, 1982
Applicant:
Inventor:
Kazuo Minami, Kawasaki, JP;
Assignee:
Tokyo Institute of Technology, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
315-3 ; 313442 ; 313454 ; 313336 ; 315-529 ;
Abstract
A magnetron injection gun comprising a conical cold-cathode and a cylindrical anode coaxially surrounding the cold-cathode. The anode is provided with an annular projection extending toward the emission ring surface, and the surface of the conical cold-cathode is coated with an insulating film, except for a portion opposite the end of the annular projection, which forms a conductive emission ring.