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:
Oct. 16, 2001
Filed:
Dec. 17, 1999
Eiichirou Uda, Tokyo, JP;
Toshiharu Higuchi, Yokohama, JP;
Osamu Nakamura, Tokyo, JP;
Kiyomi Koyama, Yokohama, JP;
Sadao Matsumoto, Sagamihara, JP;
Yoshiaki Ouchi, Yokohama, JP;
Kazuo Kobayashi, Yokohama, JP;
Takashi Sudo, Chigasaki, JP;
Katsuhisa Homma, Yokosuka, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
There is provided an impregnated-type cathode substrate comprising a large particle diameter low porosity region and a small particle diameter high porosity region which is provided in a side of an electron emission surface of the large particle diameter low porosity region and has an average particle diameter smaller than an average particle diameter of the large particle diameter low pore region and a porosity higher than a porosity of the large particle diameter low porosity region, the impregnated-type cathode being impregnated with an electron emission substance.