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:
May. 07, 1996
Filed:
Jul. 07, 1994
Applicant:
Inventors:
Assignee:
Sumitomo Electric Industries, Ltd., Osaka, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B23H / ;
U.S. Cl.
CPC ...
219 6915 ; 295921 ;
Abstract
An electrode tube for electrical discharge machining includes an outer peripheral portion and a plurality of rails or ribs projecting inwardly from an outer peripheral portion toward the central axis of the tube. The rails or ribs are formed integrally with the outer peripheral portion by drawing, or cold rolling, or hot extrusion. The space inside the tube is substantially divided into a plurality of through holes along the central axis by the plurality of rails or ribs.