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:
Apr. 02, 1996
Filed:
Mar. 09, 1993
Hiroyuki Kyushima, Hamamatsu, JP;
Yutaka Hasegawa, Hamamatsu, JP;
Masuo Ito, Hamamatsu, JP;
Junichi Takeuchi, Hamamatsu, JP;
Koichiro Oba, Hamamatsu, JP;
Hamamatsu Photonics K. K., Shizuoka, JP;
Abstract
A photomultiplier tube which obtains a large decrease in manufacture time, prevents generation of gas within the envelope, prevents deterioration of electron multiplier assembly (dynodes), and greatly reduces noise. The envelope includes an all-metal cylindrical sidewall, at one end of which is an annular, flange-shaped, metal sealing area. The stem of the photomultiplier tube has another annular flange-shaped, metal sealing area. These two sealing areas are welded together. Also a metal exhaust tube is connected to the stem by resistance welding. The metal exhaust tube is severed using pinch-off seal at the final stage of the photomultiplier tube production.