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| Number | Title | Issue Date |
| 4842051 | Rabble arm used in multiple hearth furnace A rabble arm adapted to be connected to a rotatable center shaft of a multiple hearth furnace includes an elongated tubular member having an open end portion and an opposite closed end portion. The tubular member has an outside surface of substantially ov... | 06/27/1989 |
| 4432412 | Cooling device Cooling device for coal dust comprising a housing, a motor-driven conveyor system therein to transport the coal dust over coolable trays in the housing and conveyor-wheel arms of spiral curvature for moving the coal dust from one or more inlets to one or ... | 02/21/1984 |
| 4353413 | Rendering dryer A dryer is provided with interacting heat transfer stator and rotor for improved processing capability. The stator comprises a stationary row of planar heat exchange banks supported within the vessel of the dryer. The rotor has a complemental number of an... | 10/12/1982 |
