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:
Jul. 10, 2012
Filed:
Jan. 10, 2011
Applicants:
Theodore Carl Tessner, Ii, Hillsboro, OR (US);
Gregory A. Schwind, Portland, OR (US);
Lynwood W. Swanson, McMinnville, OR (US);
Inventors:
Theodore Carl Tessner, II, Hillsboro, OR (US);
Gregory A. Schwind, Portland, OR (US);
Lynwood W. Swanson, McMinnville, OR (US);
Assignee:
FEI Company, Hillsboro, OR (US);
Primary Examiner:
Int. Cl.
CPC ...
H01J 19/24 (2006.01); H01J 17/38 (2006.01); H01J 1/304 (2006.01);
U.S. Cl.
CPC ...
Abstract
A stable cold field electron emitter is produced by forming a coating on an emitter base material. The coating protects the emitter from the adsorption of residual gases and from the impact of ions, so that the cold field emitter exhibits short term and long term stability at relatively high pressures and reasonable angular electron emission.