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:
May. 17, 2022
Filed:
Jun. 21, 2021
Applicant:
The Government of the United States of America, As Represented BY the Secretary of the Navy, Arlington, VA (US);
Inventors:
Kevin Jensen, Washington, DC (US);
Michael McDonald, Washington, DC (US);
Assignee:
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H01J 1/304 (2006.01);
U.S. Cl.
CPC ...
H01J 1/304 (2013.01);
Abstract
A compound field emitter (CFE) includes a first surface possessing a field enhancement factor >1, and a second surface possessing one or both of a field enhancement factor >1, or a low work function, wherein the second surface is coated, formed or applied upon the first surface. The second surface has a characteristic size at least 3 times smaller than the first surface, and the outer surface includes a coating of calcium aluminate 12CaO-7Al2O3.