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:
Mar. 23, 1999
Filed:
Sep. 25, 1997
Shinichi Muramatsu, Hamamatsu, JP;
Fumihiro Takayama, Hamamatsu, JP;
Toyohiko Terada, Hamamatsu, JP;
Hamamatsu Photonics K.K., Hamamatsu, JP;
Abstract
A photomultiplier tube of the present invention is the one which collects the electrons, which have been multiplied by the dynodes laminated into a plurality of stages in the electron multiplier section and that have subsequently been reflected at the final-stage dynode, as an output signal. The photomultiplier tube forms the final-stage dynode as multi-stage, for example, in two layers, and has its alkali metal vapor passage holes of its first layer so arranged as to have the holes shifted with respect to the alkali metal vapor passage holes of the second layer. Furthermore, each of the dynodes, except the final-stage dynode consists of the focusing mesh electrode, the coarse mesh electrode, and the spacer electrode and the reinforcing bars are formed at identical locations in the coarse mesh electrode and the spacer electrode. Secondary electron emission sections are provided in the vicinity regions of these reinforcing bars of the focusing mesh electrodes.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile