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:
Sep. 13, 1988
Filed:
Mar. 10, 1986
Applicant:
Inventors:
Shigeo Takenaka, Fukaya, JP;
Takeo Itou, Fukaya, JP;
Norio Koike, Fukaya, JP;
Hidemi Matsuda, Fukaya, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ; H01J / ;
U.S. Cl.
CPC ...
313479 ; 313481 ; 313553 ; 313558 ;
Abstract
Electron tube having an evacuated envelope equipped with an electron emitting cathode, wherein a layer of activated silicon oxide is formed inside the envelope. The activated silicon oxide layer improves the emission life.