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:
Aug. 29, 2000
Filed:
Jul. 31, 1997
Applicant:
Inventors:
Tomonori Tsuchimoto, Hashima-gun, JP;
Akimitsu Hiraki, Chita-gun, JP;
Yoshihiko Kurashima, Nagoya, JP;
Assignee:
NGK Insulators, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B26F / ;
U.S. Cl.
CPC ...
83660 ; 30366 ; 8369891 ; 83929 ;
Abstract
A drilling jig has a pyramidal tip, a cylindrical portion, and a proximal end. The pyramidal tip is formed like a polygonal pyramid and each pyramidal face is provided with a concave. The cylindrical portion connecting with the pyramidal tip is formed like a prism and the proximal end is made of a flat plate functioning as a stopper. The drilling jig makes it possible to efficiently recover sodium from a spent NaS cell without greatly damaging the structure of the cell.