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. 01, 1987
Filed:
Nov. 08, 1984
Yoichi Ino, Tokyo, JP;
Anelva Corporation, , JP;
Abstract
In an apparatus for counting ions, a double-collector electron multiplier comprises a first and a second collector for receiving secondary electrons from an exit end of a dynode member of the electron multiplier. The first and the second collectors have a first and a second electron receiving surface, respectively, wherein the second electron receiving surface has a narrower area than the first electron receiving surface. A first and a second amplifier are separately used in amplifying a first and a second electric current produced from the first and the second collectors, respectively. An ammeter is connected through a switch selectively to the first and the second amplifiers to provide a selected measuring range for the number of ions which enter the electron multiplier.