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. 25, 2006
Filed:
Nov. 14, 2003
Applicant:
Koji Iwasawa, Kyoto, JP;
Inventor:
Koji Iwasawa, Kyoto, JP;
Assignee:
Nissin Electric Co., Ltd., Kyoto, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 31/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
An ion source device includes an ion source having a filament for emitting thermoelectrons, a current measuring device for measuring current flowing through the filament, a voltage measuring device for measuring voltage across the filament, a resistance operation device for computing a resistance value of the filament by using the current and the voltage measured by the current and voltage measuring devices, and a prediction operation device for computing a time till the application limits of the filament or a time left till the application limits of the filament.