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| Number | Title | Issue Date |
| 5198809 | Hard wired programmable controller especially for heating ventilating and air conditioning (HVAC systems) Inputs are programmably interfaced and interlocked with output so that the state of the outputs and the operation of equipment connected thereto depends on the hierarchy or priority (control strategy) which is programmed into the controller. The inputs ma... | 03/30/1993 |
| 4873873 | Air flow metering terminal and control system A system for metering the flow rate of air through a duct in which gates are pivotally mounted and connected together to vary the area of the duct. The gates are balanced so as to be effectively weightless. The forces on and the position of the gates corr... | 10/17/1989 |
| 4827372 | Mounting assembly An assembly for mounting and connecting components, either electrical or pneumatic devices, which are arranged on boards such as printed circuit boards. A channel having a base and flexible side walls receives the edges of the boards in grooves along the ... | 05/02/1989 |
| 4484122 | Variable potentiometer motor controller A controller for operating devices adapted for motor control, such as dampers, valves and the like in a heating, ventilating and air conditioning (HVAC) system interfaces with a serial link which may carry control signals for operating a multiplicity of c... | 11/20/1984 |
