Convertible billboard display
Claims
The ornamental design for a convertible billboard display, as shown and described.
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| 2091260 | August 1937 | Farkas et al. |
| 2881662 | April 1959 | Harris |
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| 20040130139 | July 8, 2004 | Reising |
Type: Grant
Filed: Aug 16, 2005
Date of Patent: Jun 19, 2007
Inventor: William H. Shaffer (Cinnaminson, NJ)
Primary Examiner: Robert M. Spear
Assistant Examiner: Mary Ann Calabrese
Attorney: Stuart M. Goldstein
Application Number: 29/236,445