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:
Apr. 28, 1992
Filed:
Jan. 12, 1990
Applicant:
Inventors:
Georges Faillon, Meudon, FR;
Christophe Bastien, Asniers, FR;
Christine Farvet, La Celle Saint Cloud, FR;
Assignee:
Thomson Tubes Electroniques, Billancourt, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ; H01J / ;
U.S. Cl.
CPC ...
313153 ; 313155 ; 313443 ;
Abstract
This disclosure concerns electron guns comprising several electrodes, including a cathode. The gun has a device producing a magnetic field, adjustable if necessary, in the vicinity of the cathode. This device works together with one of the electrodes other than the cathode. It cooperates notably with the anode or the wehnelt. This device is either a solenoid or one or more permanent magnets. This device is placed either inside or outside the gun. It can be applied to high-power, 'O' type electron tubes.