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The ornamental design for a grindstone, as shown and described.
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FIG. 1 is a front perspective view of a grindstone showing a first embodiment of my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is a front perspective view of a grindstone showing a second embodiment of my new design;
FIG. 10 is a rear perspective view thereof;
FIG. 11 is a front view thereof;
FIG. 12 is a rear view thereof;
FIG. 13 is a left side view thereof;
FIG. 14 is a right side view thereof;
FIG. 15 is a top view thereof;
FIG. 16 is a bottom view thereof;
FIG. 17 is a front perspective view of a grindstone showing a third embodiment of my new design;
FIG. 18 is a rear perspective view thereof;
FIG. 19 is a top view thereof;
FIG. 20 is a bottom view thereof;
FIG. 21 is a left side view thereof;
FIG. 22 is a right side view thereof;
FIG. 23 is a top view thereof; and,
FIG. 24 is a bottom view thereof.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
May 22 2002 | AMAMOTO, HIROFUMI | SANWA KENMA, LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 012978 | /0036 | |
May 30 2002 | Sanwa Kenma, Ltd. | (assignment on the face of the patent) | / |
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