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					| Patent    D555873 |  
					| Priority Dec 04 2006 |  
					| Filed Dec 04 2006 |  
					| Issued Nov 20 2007 |  
					| Expiry Nov 20 2021 |  
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					| Assg.orig |  
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					| Entity unknown |  
					 | 1 |  
					 | 7 |  
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			  The ornamental design for an extension piece for flow track, as shown and described.  | 
 
	
FIG. 1 is a side view of my extension piece for flow track showing my new design;
FIG. 2 is a side view thereof, with the extension piece attached to a flow track in an extended position;
FIG. 3 is a side view thereof, with the extension piece attached to a flow track in a retracted position;
FIG. 4 is a front view thereof;
FIG. 5 is a perspective view thereof; and,
FIG. 6 is another perspective view thereof.
The broken line showing of a flow track in FIGS. 2–5 is included for the purpose of illustrating environment and forms no part of the claimed design.
	
	McIlvaine, Howard
	
	
	
	
	
	
	  
	  	 | Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
	  | Dec 04 2006 |  | UNEX Mfg. | (assignment on the face of the patent) | / |  | 
    
	
	
	
	  
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