Chair backrest
Description
Claims
The ornamental design for a chair backrest, as shown and described.
Referenced Cited
U.S. Patent Documents
D493627 | August 3, 2004 | Ma |
D514831 | February 14, 2006 | Tsai |
D540081 | April 10, 2007 | Su |
D540579 | April 17, 2007 | Su |
D540580 | April 17, 2007 | Su |
D543398 | May 29, 2007 | Su |
D544735 | June 19, 2007 | Su |
D557028 | December 11, 2007 | Su |
D577519 | September 30, 2008 | Su |
D580199 | November 11, 2008 | Su |
D596430 | July 21, 2009 | Su |
D596885 | July 28, 2009 | Su |
Patent History
Patent number: D660621
Type: Grant
Filed: Nov 4, 2011
Date of Patent: May 29, 2012
Inventor: Tung-Hua Su (Tainan)
Primary Examiner: Mimosa De
Application Number: 29/405,755
Type: Grant
Filed: Nov 4, 2011
Date of Patent: May 29, 2012
Inventor: Tung-Hua Su (Tainan)
Primary Examiner: Mimosa De
Application Number: 29/405,755
Classifications
Current U.S. Class:
D6/502;
D6/366