Ball end mill

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Description

FIG. 1 is a front elevational view of a ball end mill showing our new design;

FIG. 2 is a right side elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a top plan view;

FIG. 6 is a bottom plan view; and,

FIG. 7 is a front and left side perspective view thereof.

Referenced Cited
U.S. Patent Documents
4252480 February 24, 1981 Mizuno et al.
4265574 May 5, 1981 Eckle
4527930 July 9, 1985 Harroun
4564321 January 14, 1986 Kondo et al.
4566827 January 28, 1986 Neumueller
4585375 April 29, 1986 Erkfritz
4588331 May 13, 1986 Yoshinori
4618296 October 21, 1986 Allaire et al.
Patent History
Patent number: D309317
Type: Grant
Filed: Apr 13, 1988
Date of Patent: Jul 17, 1990
Assignee: Mitsubishi Kinzoku Kabushiki Kaisha (Tokyo)
Inventors: Osamu Tsujimura (Kawasaki), Tatsuo Arai (Kitamoto), Masayuki Okawa (Kawasaki)
Primary Examiner: Nelson C. Holtje
Assistant Examiner: Jeffrey Asch
Law Firm: Cushman, Darby & Cushman
Application Number: 7/181,153