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:
Sep. 13, 1983
Filed:
Apr. 13, 1981
Hinrich Heynisch, Grafelfing, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
Travelling wave tube, including a cylindrical vacuum shell having an outer diameter, a permanent magnet system surrounding the cylindrical vacuum shell including ring-shaped pole shoes having inner and outer diameters, magnet rings having inner and outer diameters and forming pairs with the pole shoes, each of the magnet rings being alternatingly disposed between two pole shoes in axial direction and being poled in opposite sense with respect to the next magnet ring, the inner diameters of the pole shoes being closely fitted around the vacuum shell and being smaller than the inner diameters of the magnet rings, the outer diameters of the magnet ring being larger than the outer diameters of the pole shoes, and a centering and retaining ring being adjacent to and in contact with each of the pole shoe and magnet ring pairs for centralizing the inner diameters of the pole shoes to the outer diameters of the magnet rings and for centralizing the inner diameters of the pole shoes and the outer diameters of the magnet rings to the outer diameter of the vacuum shell.