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| Number | Title | Issue Date |
| 4989503 | Wind controlled roof ventilation system A wind-directed ventilator hood assembly for a narrow elongated air exit opening in the roof of a farm building spanning a long portion of the roof, including hood supporting uprights projecting upwardly from the air exit opening at plural spaced location... | 02/05/1991 |
| 4487112 | Chimney turncap A chimney turncap is provided with interior lower drains (14) for guiding condensed water to a collector tray (6) located in the warm zone of the chimney top, whereby the water disappears by evaporation. The hood portion (8) is a semitubular element havin... | 12/11/1984 |
| 4320697 | Chimney ventilating cap A chimney ventilating cap for the evacuation of combustion gas from chimneys. The cap comprises a spherical hollow dome body defined by a forward and a rear partly semi-spherical body portion. The front and rear body portions are secured together in a spa... | 03/23/1982 |
