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:
Dec. 04, 1979
Filed:
Feb. 23, 1978
Applicant:
Inventor:
Yoshio Ishida, Mobara, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
315 3971 ; 315 3951 ; 315 3975 ;
Abstract
A magnetron having permanent magnets sealed in the vacuum container, in which the permanent magnets and pole pieces associated therewith are supported with the inner wall of the vacuum container and holders provided thereon, and the pole pieces are projecting through the openings of holders into the interaction spaces which are defined between vanes in the vacuum container and a cathode, and the projecting portion of the pole piece is fixed to the opening of the holder by means of arc-welding or silver-alloy brazing.