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The ornamental design for a portable spirometer, as shown and described. |
FIG. 1 is a perspective view of a portable spirometer, showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left end elevational view thereof;
FIG. 5 is a right end elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Mar 12 1990 | SWEENEY, PAUL B JR | Welch Allyn, Inc | ASSIGNMENT OF ASSIGNORS INTEREST | 005297 | /0165 | |
Mar 30 1990 | Welch Allyn, Inc. | (assignment on the face of the patent) | / |
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