Bolster spring
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The broken lines in the drawings are for the purpose of illustrating portions of the bolster spring that form no part of the claimed design. Portions of the bolster spring shown in broken lines form no part of the claimed design.
Claims
The ornamental design for a bolster spring, as shown and described.
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Type: Grant
Filed: Aug 16, 2016
Date of Patent: Jul 3, 2018
Assignee: Hendrickson USA, L.L.C (Itasca, IL)
Inventors: Shawn D. Noble (Naperville, IL), Andrew X. Rarey (North Aurora, IL)
Primary Examiner: Michael A. Pratt
Application Number: 29/574,562