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. 18, 1986
Filed:
Feb. 24, 1984
Hikaru Matsuzaki, Yokohama, JP;
Toshiyuki Matsuzaki, Kawasaki, JP;
Abstract
An anode cylinder of a magnetron is formed of a rectangular copper plate member. The plate member is curved in a rolling process to be formed into a cylindrical primary workpiece. In a first cold extrusion process, the primary workpiece is forced successively into a first die having an inner diameter shorter than the outer diameter of the primary workpiece and a second die having an inner diameter shorter than that of the first die and arranged in line with the first die. Thus, the primary workpiece is continuously reduced in its outer diameter to be formed into a secondary workpiece. The thickness reduction rate of the primary workpiece used during its passage through each of the first and second dies is limited to 3% or less. The secondary workpiece has its unnecessary portions removed in a cutting process and its seam filled up airtightly in an airtight bonding process.