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:
May. 13, 2003
Filed:
Apr. 27, 2001
Applicant:
Inventors:
Minoru Niigaki, Hamamatsu, JP;
Toru Hirohata, Hamamatsu, JP;
Tomoko Mochizuki, Hamamatsu, JP;
Hirofumi Kan, Hamamatsu, JP;
Assignee:
Hamamatsu Photonics K.K., Shizouka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 4/018 ;
U.S. Cl.
CPC ...
H01J 4/018 ;
Abstract
This photocathode comprises: InP substrate ; InAs P (0<x2<1) buffer layer ; In Ga As (1>x1>0.53) light-absorbing layer ; InAs P (0<x3<1) electron-emitting layer ; InAs P contact layer formed on the electron-emitting layer ; active layer of an alkali metal or its oxide or fluoride formed on the exposed surface of electron-emitting layer ; and electrodes and