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. 24, 2015
Filed:
Nov. 11, 2013
Applied Physics Technologies, Inc., McMinnville, OR (US);
Gerald Magera, Hillsboro, OR (US);
William Mackie, McMinnville, OR (US);
Larry Southall, McMinnville, OR (US);
Gary Cabe, McMinnville, OR (US);
Cory Fast, McMinnville, OR (US);
Applied Physics Technologies, Inc., McMinnville, OR (US);
Abstract
A thermionic emission assembly includes a Wehnelt cap that has a cap beam aperture and a cavity within which a cathode is supported. Electrical energy applied to the cathode causes it to reach a sufficiently high temperature to emit a beam of electrons that propagate through the cap beam aperture. An anode having an anode beam aperture is positioned in spatial alignment with the cap beam aperture to receive the electrons. The anode accelerates the electrons and directs them through the anode beam aperture for incidence on a target specimen. A ceramic base forms a combined interface that electrically and thermally separates the Wehnelt cap and the anode. The thermal isolation of the Wehnelt cap from the anode allows the Wehnelt cap to increase in heat to rapidly reach a stable temperature as the cathode emits the beam of electrons.