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. 06, 2003
Filed:
Apr. 18, 2000
Applicant:
Inventor:
Didier Pierrejean, Villaz, FR;
Assignee:
Alcatel, Paris, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D 5/944 ; H01J 4/904 ;
U.S. Cl.
CPC ...
B01D 5/944 ; H01J 4/904 ;
Abstract
A system in accordance with the invention which generates electrons by means of a field-emission cathode comprises an array of electron-emitting micropoints associated with a grid and carried by a substrate with integral heater means for heating the micropoints to a temperature in the range approximately 300° C. to approximately 400° C. and maintaining them at that temperature during emission of electrons. The cathode can therefore function at higher residual air pressures with no risk of breakdown.