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:
Nov. 13, 1990
Filed:
Jan. 17, 1990
Applicant:
Inventors:
Peter E Oettinger, Acton, MA (US);
Timothy D Howard, Georgetown, MA (US);
John J Fronduto, Waltham, MA (US);
Assignee:
Thermo Electron Corporation, Waltham, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
2504 / ; 250424 ; 2504922 ; 313542 ;
Abstract
A new method and apparatus for providing a stable, temporally controllable high current density electron beam from a photocathode has been developed. A low level of cesium and, possibly a stabilizing gas, is supplied to the photoemitting surface while the electron beam is being generated, thereby replenishing cesium and possibly other ions lost from the emitting surface on a continual basis.