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The ornamental design for an oxygen concentrator, as shown and described. |
FIG. 1 is a perspective view of an oxygen concentrator, showing our new design;
FIG. 2 is a left side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof; and
FIG. 6 is a rear elevational view thereof.
Ryder, Francis E., Cerola, Joseph J.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Feb 27 1989 | RYDER, FRANCIS E | RYDER INTERNATIONAL CORPORATION, A CORP OF DE | ASSIGNMENT OF ASSIGNORS INTEREST | 005126 | /0548 | |
Feb 27 1989 | CEROLA, JOSEPH J | RYDER INTERNATIONAL CORPORATION, A CORP OF DE | ASSIGNMENT OF ASSIGNORS INTEREST | 005126 | /0548 | |
Mar 09 1989 | Ryder International Corporation | (assignment on the face of the patent) | / | |||
Dec 11 1996 | Ryder International Corporation | ATRION MEDICAL PRODUCTS, INC | MERGER SEE DOCUMENT FOR DETAILS | 008519 | /0569 |
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