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:
Feb. 07, 1978
Filed:
Jul. 30, 1976
Applicant:
Inventor:
Peter R Davis, Chelmsford, EN;
Assignee:
English Electric Valve Co., Ltd., Essex, EN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
315-35 ; 315-535 ; 315 393 ;
Abstract
A travelling wave tube of the kind having clover leaf cavities is provided with a periodic permanent magnetic structure, in which the magnetic material is located within noses projecting into the cavity space. A barrier between the magnetic material and the cavity space defines an evacuated envelope. Because the magnetic material is within the volume swept out by the cavity dimensions, it is positioned very close to the electron beam path.