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:
Jul. 16, 2002
Filed:
Jan. 21, 2000
Applicant:
Inventors:
Kiyoshi Kishiki, Kamifukuoka, JP;
Yukio Torikai, Kamifukuoka, JP;
Toshihiko Yamashita, Kamifukuoka, JP;
Hideyuki Obata, Kamifukuoka, JP;
Assignee:
New Japan Radio Co., LTD, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 2/305 ;
U.S. Cl.
CPC ...
H01J 2/305 ;
Abstract
A cathode for a magnetron having concave/convex portions on a surface of a cylindrical base metal with thermionic emitting materials being fixedly attached to concave portions from among the concave/convex portions. The convex portions of the concave/convex portions are arranged to be inclining. It is enabled to effectively protect thermionic emitting materials from inverse impulse of electrons or ions and from oscillation to thereby restrain consumption and omission of these thermionic emitting materials and to decrease higher harmonics of radiation.