Rig structure
Description
Claims
The ornamental design for a rig structure, as shown and described.
Referenced Cited
U.S. Patent Documents
2464451 | March 1949 | Keeney |
2527954 | October 1950 | Nixon |
3275301 | September 1966 | Read |
D293881 | January 26, 1988 | Hartlmeier et al. |
4760993 | August 2, 1988 | Du Preez |
D318640 | July 30, 1991 | Warnelov |
D330671 | November 3, 1992 | Greene et al. |
D541000 | April 17, 2007 | Xia et al. |
D542502 | May 8, 2007 | Wilenius |
D610771 | February 23, 2010 | Doan |
D631224 | January 18, 2011 | Lynn et al. |
D646864 | October 11, 2011 | Uhl et al. |
Patent History
Patent number: D657112
Type: Grant
Filed: Jun 6, 2011
Date of Patent: Apr 3, 2012
Inventor: Bui V. Dao (Houston, TX)
Primary Examiner: Cynthia Ramirez
Attorney: Patterson & Sheridan, LLP
Application Number: 29/393,532
Type: Grant
Filed: Jun 6, 2011
Date of Patent: Apr 3, 2012
Inventor: Bui V. Dao (Houston, TX)
Primary Examiner: Cynthia Ramirez
Attorney: Patterson & Sheridan, LLP
Application Number: 29/393,532
Classifications
Current U.S. Class:
Element Or Attachment (D34/35)