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			 The ornamental design for a heat sink, as shown and described.  | 
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FIG. 1 is a front perspective view of a heat sink showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG 5 is a bottom plan view thereof;
FIG. 6 is a left side elevational view thereof; and
FIG. 7 is a right side elevational view thereof.
Rocheleau, George A., Graves, Michael C., France, John
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Oct 07 1988 | FRANCE, JOHN | Rockford Corporation | ASSIGNMENT OF ASSIGNORS INTEREST | 004970 | /0463 | |
| Oct 07 1988 | ROCHELEAU, GEORGE A | Rockford Corporation | ASSIGNMENT OF ASSIGNORS INTEREST | 004970 | /0463 | |
| Oct 12 1988 | GRAVES, MICHAEL C | Rockford Corporation | ASSIGNMENT OF ASSIGNORS INTEREST | 004970 | /0463 | |
| Oct 24 1988 | Rockford Corporation | (assignment on the face of the patent) | / | |||
| Mar 18 1992 | ROCKFORD CORPORATION, AN AZ CORP | FOOTHILL CAPITAL CORPORATION, A CORPORATION OF CA | SECURITY INTEREST SEE DOCUMENT FOR DETAILS | 006096 | /0661 | |
| Dec 14 1995 | Rockford Corporation | FIRST INTERSTATE BANK OF ARIZONA, N A | COLLATERAL ASSIGNMENT & SECURITY AGREEMENT | 007749 | /0684 | |
| Jun 20 1997 | Rockford Corporation | FINOVA CAPITAL CORPORATION | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 008628 | /0327 | |
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| Aug 05 1997 | FOOTHILL CAPITAL CORPORATION | Rockford Corporation | LIEN RELEASE | 008753 | /0721 | |
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| Jun 11 2003 | FINOVA CAPITAL CORPORATION | Rockford Corporation | LIEN RELEASE | 014186 | /0606 | |
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| Mar 30 2004 | BANK OF AMERICA, N A , AS COLLATERAL AGENT | Rockford Corporation | TERMINATION OF SECURITY INTEREST IN PATENTS | 015223 | /0696 | |
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