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:
Dec. 19, 2023
Filed:
Jan. 21, 2023
Applicants:
Dazhi Chen, San Jose, CA (US);
Zhongwei Chen, Los Altos Hills, CA (US);
Inventors:
Dazhi Chen, San Jose, CA (US);
Zhongwei Chen, Los Altos Hills, CA (US);
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
H01J 1/304 (2006.01);
U.S. Cl.
CPC ...
H01J 1/3044 (2013.01); H01J 2201/30415 (2013.01); H01J 2201/30426 (2013.01); H01J 2201/30496 (2013.01);
Abstract
A field-emission type electron source includes (i) a single-crystal tungsten rod having a sharpened terminus and (ii) a mass of ZrO formed only on a portion of the surface, or the entire surface, of the sharpened terminus. In preferred design, the single-crystal tungsten rod is placed in a gaseous medium that consists of oxygen and a non-oxygen gas. The molar ratio between oxygen and the non-oxygen gas is greater than 1:1.