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Document Number
US Patent 7455366
Issued Date
November 25, 2008
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Abstract
A cushioning material 8 is stretched over a frame 6 by engaging only front and rear edges of the cushioning material 8 with the frame 6, thereby applying a tension to the cushioning material 8 substantially only in the longitudinal direction thereof.
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Number of Claims:
12
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Published
November 25, 2008
Application Number
10/496,133
Filed
August 7, 2003
US Classification
297/452.64   297/440.11
Int'l Classification
A47C   7/02   (20060101)  
Priority Data
Aug 07, 2002 [JP] 2002-229640
USPTO Field of Search
297/440.11   297/452.64   297/219.1  
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