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. 08, 1977
Filed:
Apr. 02, 1976
Applicant:
Inventor:
Peter Robert Davis, Chelmsford, EN;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
315-35 ; 315-36 ; 315-535 ;
Abstract
The magnetic field produced by the periodic permanent magnets of a travelling wave tube is shaped to improve the transmission ratio of the electron beam. The first zero magnetic field occurs within the magnet region, and the first peak magnetic field occurs at the first minima of the diameter of the electron beam.