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The ornamental design of a damper unit, as shown and described. |
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FIG. 1 is a perspective view of the damper unit showing our new design.
FIG. 2 is a top plan view thereof.
FIG. 3 is a bottom plan view thereof.
FIG. 4 is an end elevational view thereof, the opposite end being a mirror image of the end shown.
FIG. 5 is a left side elevational view thereof.
FIG. 6 is a right side elevational view thereof.
Prikkel, III, John, Booher, Dale R., Killin, Jeffrey R.
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| 4165833, | Mar 30 1978 | YORK-LUXAIRE, INC , A CORP OF DE | Automatic flue damper |
| 4290552, | Aug 14 1980 | Damper control mechanism | |
| 4361272, | Apr 06 1981 | Energy Vent, Inc. | Thermal damper for rectangular flue |
| D268281, | Sep 26 1979 | Damper |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Mar 31 1981 | PRIKKEL JOHN III | ENERGY VENT, INC , A CORP OF OH | ASSIGNMENT OF ASSIGNORS INTEREST | 003876 | /0768 | |
| Mar 31 1981 | BOOHER DALE R | ENERGY VENT, INC , A CORP OF OH | ASSIGNMENT OF ASSIGNORS INTEREST | 003876 | /0768 | |
| Mar 31 1981 | KILLIN JEFFREY R | ENERGY VENT, INC , A CORP OF OH | ASSIGNMENT OF ASSIGNORS INTEREST | 003876 | /0768 | |
| Apr 06 1981 | Energy Vent, Inc. | (assignment on the face of the patent) | / |
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