The broken lines shown in the figures are for illustrative purposes only, and the subject matter depicted thereby constitutes no part of the claimed design.
The ornamental design for a double-walled tank, as shown and described.
Filed: Jul 1, 2008
Date of Patent: Jul 14, 2009
Inventors: Dwayne Long (Springfield, MO), Scott Higgins (Ozark, MO), John R. Redmond (Springfield, MO), Dwayne Holden (Springfield, MO), Robert Letterman (Springfield, MO)
Primary Examiner: Robin V Webster
Attorney: Polsinelli Shughart PC
Application Number: 29/320,693