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FIG. 1 is a front-right-top perspective view of a sharpener, showing my new design;

FIG. 2. is a front elevational view thereof;

FIG. 3. is a rear elevational view thereof;

FIG. 4. is a left side elevational view thereof;

FIG. 5. is a right side elevational view thereof;

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

FIG. 7. is a bottom plan view thereof.

The broken lines in FIG. 7 illustrate features of the sharpener that form no part of the claim.


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

Referenced Cited
U.S. Patent Documents
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D162768 April 1951 Anheuser
D241504 September 1976 Krusche et al.
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D284736 July 22, 1986 Kawai et al.
D309414 July 24, 1990 Shimizu
D309415 July 24, 1990 Shimizu
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D388304 December 30, 1997 Friel
D409891 May 18, 1999 Friel et al.
D470382 February 18, 2003 Kurz
D517891 March 28, 2006 Tsuchida
D525509 July 25, 2006 Weschenfelder
D624799 October 5, 2010 De Bretton Gordon
D640115 June 21, 2011 Huff et al.
Patent History
Patent number: D668524
Type: Grant
Filed: Jan 24, 2012
Date of Patent: Oct 9, 2012
Inventor: Ching-Sen Yang (Taichung)
Primary Examiner: Philip S Hyder
Assistant Examiner: Roselynne Cody
Attorney: Pro-Techtor Int'l Services
Application Number: 29/411,569
Current U.S. Class: D8/93