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The ornamental design for adjustable and convertible audio headphones, as shown and described.
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The present application is related to co-pending U.S. utility patent application Ser. No. 13/446,321, entitled “Adjustable and Convertible Audio Headphones”, having a common inventor and filed on even date.
Surfaces or portions shown in the figures with dashed lines form no part of the claimed design.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Apr 13 2012 | The Echo Design Group, Inc. | (assignment on the face of the patent) | / | |||
Feb 07 2013 | DOUGHERTY, CHRISTOPHER | THE ECHO DESIGN GROUP, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 030094 | /0835 | |
Dec 17 2018 | THE ECHO DESIGN GROUP, INC | Wells Fargo Bank, National Association | PATENT SECURITY AGREEMENT | 048857 | /0361 |
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