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FIG. 1 is a perspective view of a grindstone showing my new design;

FIG. 2 is a front end view thereof;

FIG. 3 is a rear end view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line showing is for illustrative purposes only and forms no part of the claimed design.


The ornamental design for a grindstone, as shown and described.

Referenced Cited
U.S. Patent Documents
D278968 May 28, 1985 Farmer, Sr.
D309414 July 24, 1990 Shimizu
D328604 August 11, 1992 Chien
D363867 November 7, 1995 Harrison et al.
D447756 September 11, 2001 Wang
D472565 April 1, 2003 Amamoto
D505683 May 31, 2005 Pfaff
D523717 June 27, 2006 Guo et al.
D537698 March 6, 2007 Hasegawa
D558801 January 1, 2008 Chen
20020197942 December 26, 2002 Jansson
20040038631 February 26, 2004 Chen et al.
20060211345 September 21, 2006 Levsen
Patent History
Patent number: D601598
Type: Grant
Filed: Sep 23, 2008
Date of Patent: Oct 6, 2009
Inventors: Ching-Sen Yang (Taichung), Eric Liao (Taichung)
Primary Examiner: Sandra Snapp
Assistant Examiner: Patricia Palasik
Application Number: 29/324,875
Current U.S. Class: Bench Or Table Mounted (D15/125)