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. 08, 2001
Filed:
Apr. 14, 1999
Applicant:
Inventors:
Isamu Yoshida, Shizuoka, JP;
Masahiro Nobutomo, Shizuoka, JP;
Koji Tateishi, Shizuoka, JP;
Takayuki Owada, Shizuoka, JP;
Assignee:
NTN Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C 4/566 ;
U.S. Cl.
CPC ...
B29C 4/566 ;
Abstract
An injection unit driving device or an mold-clamping unit driving device having a ball screw having a long life. Of the parts of the ball screw, only the balls are subjected to carburizing/nitriding treatment, while the threaded shaft and the nut are subjected to conventional hardening.