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:
Jul. 15, 2014
Filed:
Dec. 19, 2012
Schlumberger Technology Corporation, Sugar Land, TX (US);
Jani Reijonen, Princeton, NJ (US);
Irina Molodetsky, Princeton Junction, NJ (US);
Kenneth E. Stephenson, Plainsboro, NJ (US);
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
An ion source includes a cathode emitting primary electrons, a cathode grid downstream of the cathode, a reflector electrode downstream of the cathode grid, a reflector grid radially inward of the reflector electrode, and an extractor electrode downstream of the reflector electrode. The cathode and the cathode grid have a voltage difference such that the electric field accelerates the primary electrons on a trajectory toward the extractor electrode. The reflector grid and the extractor electrode have a voltage difference such that the electric field repels the primary electrons on a trajectory away from the extractor electrode and toward the reflector electrode. The cathode and reflector electrode have a voltage difference such that some primary electrons strike the reflector electrode, creating secondary electrons. The reflector grid has a positive potential such that the electric field attracts the primary and secondary electrons into the ionization region where they interact with ionizable gas.