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. 17, 1984
Filed:
Jul. 14, 1981
Applicant:
Inventor:
Mamoru Tsuzurahara, Mobara, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
315 3951 ; 315 3953 ; 315 3971 ;
Abstract
A magnetron having a pair of pole pieces arranged at both ends of a cylindrical anode, a pair of permanent magnets corresponding respectively to the pole pieces, and a pair of intermediate rings each disposed between the pole piece and the permanent magnet is disclosed, in which each of the intermediate rings includes a disc portion, a plurality of projections formed on one of the surfaces of the disc portion and abutting on the pole piece and a plurality of projections formed on the other surface of the disc portion and abutting on the permanent magnet.