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:
Jan. 17, 1989
Filed:
Mar. 06, 1985
Applicant:
Inventors:
Robert Duret, Coignieres Maurepas, FR;
Georges Fleury, Gif Sur Yvette, FR;
Assignee:
Thomson-C.S.F., Paris, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313447 ; 313454 ; 313349 ;
Abstract
In electron guns for electronic tubes, such as travelling wave tubes, for power modulating the electron beam, the distance between the cathode and the modulation grid increases the closer to the axis of the tube. Such a gun can be applied to travelling wave tubes operating with a zero enabling voltage and whose modulating frequency covers a very wide band.