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:
Aug. 12, 2025
Filed:
May. 15, 2024
Applicant:
Fei Company, Hillsboro, OR (US);
Inventors:
Kun Liu, Portland, OR (US);
Joshua Mutch, Salem, OR (US);
Assignee:
FEI Company, Hillsboro, OR (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 37/073 (2006.01); H01J 1/304 (2006.01); H01J 9/02 (2006.01); H01J 37/285 (2006.01);
U.S. Cl.
CPC ...
H01J 37/073 (2013.01); H01J 1/3044 (2013.01); H01J 9/025 (2013.01); H01J 37/285 (2013.01); H01J 2201/30492 (2013.01); H01J 2209/0223 (2013.01); H01J 2237/06341 (2013.01);
Abstract
Apparatus and methods are disclosed for a mechanically stable, long-life, cold field emitter assembly which is compatible with ultra-high vacuum and occasional high-temperature flashing. A metal adapter is welded between a hexaboride electrode and a metal filament. Some embodiments use a tungsten filament, a tantalum adapter, and a LaB6 microrod electrode with a nanorod emitter tip. Other material combinations are disclosed, as also usage in electron sources for electron microscopes. In variations, the adapter is deposited onto the filament and the electrode then welded to the adapter.