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The ornamental design for a portable oxygen concentrator, as shown and described.
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FIG. 1 is a right perspective view of the portable oxygen concentrator of the present design;
FIG. 2 is a front view of the portable oxygen concentrator of the present design;
FIG. 3 is a rear view of the portable oxygen concentrator of the present design;
FIG. 4 is a right side view of the portable oxygen concentrator of the present design;
FIG. 5 is a left side view of the portable oxygen concentrator of the present design;
FIG. 6 is a top view of the portable oxygen concentrator of the present design; and,
FIG. 7 is a bottom view of the portable oxygen concentrator of the present design.
The broken lines showing additional features of the portable oxygen concentrator in FIGS. 1-7 are for illustrative purposes only and form no part of the claimed design.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Mar 23 2005 | Inogen, Inc. | (assignment on the face of the patent) | / | |||
| Jun 03 2005 | CONWAY, SCOTT | INOGEN, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 016337 | /0104 | |
| Jun 03 2005 | BARE, REX O | INOGEN, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 016337 | /0104 | |
| Oct 12 2012 | INOGEN, INC | COMERICA BANK, A TEXAS BANKING ASSOCIATION | SECURITY AGREEMENT | 029164 | /0751 | |
| Aug 25 2014 | COMERICA BANK, AS AGENT | INOGEN, INC | RELEASE BY SECURED PARTY SEE DOCUMENT FOR DETAILS | 033854 | /0753 |
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