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. 06, 2009
Filed:
Aug. 06, 2004
Applicants:
Masayuki Aiga, Tochigi, JP;
Toshiyuki Tsukada, Tochigi, JP;
Inventors:
Masayuki Aiga, Tochigi, JP;
Toshiyuki Tsukada, Tochigi, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 1/62 (2006.01);
U.S. Cl.
CPC ...
Abstract
A cathode substrateis heated to 400 to 600° C. in the atmosphere of hydrocarbon gas such as methane and the gas is allowed to react with the surface of the cathode substrateby a thermal CVD method. Thus, an electron emission source in which graphite nano-fibersare allowed to grow in a gaseous-phase on the surface of the cathode substrateby using nickel or iron existing on the surface of the cathode substrateas a nucleus is held between upper and lower end hatsto form a cathode part