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. 03, 1997
Filed:
Mar. 02, 1995
Applicant:
Inventors:
Seiji Kitakaze, Mobara, JP;
Yuichi Ito, Isumi-gun, JP;
Toshio Ogura, Mobara, JP;
Tomokatsu Oguro, Mobara, JP;
Iwao Umeki, Mobara, JP;
Masumi Kuga, Chousei-gun, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Device Engineering Co., Ltd., Chiba-ken, JP;
Hitachi Electronic Devices Co., Ltd., Chiba-ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
315 3951 ; 315 3975 ;
Abstract
A magnetron having eight anode vanes (2) arranged radially inside an anode cylinder (3) and a helically coiled, directly heated filament positioned along the anode cylinder. The magnetron oscillates at a basic frequency of 2450 MHz. The external diameter of the helically coiled, directly heated filament is in the range of 2.6 to 3.2 mm, and the diameter between the internal ends of the anode vanes is in the range of 7.0 to 8.0 mm.