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. 28, 2004
Filed:
May. 03, 2002
Applicant:
Inventors:
Gregory A. Schwind, Portland, OR (US);
David S. Jun, Portland, OR (US);
Gerald G. Magera, Portland, OR (US);
Assignee:
FEI Company, Hillsboro, OR (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 1/14 ; H01J 1/908 ; H01J 9/02 ; H01J 9/00 ;
U.S. Cl.
CPC ...
H01J 1/14 ; H01J 1/908 ; H01J 9/02 ; H01J 9/00 ;
Abstract
An electron emitter is produced by applying a work function lowering material that does not require an extensive heating step before the material will function to lower the work function. By eliminating the extensive heating step, a small radius, highly tapered emitter tip will retain its shape to consistently produce a high angular intensity at a reasonable output power level.