Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4243173 | Pneumatic optimizer A system for controlling the starting time of a thermal conditioning system for air in an enclosed space includes a pneumatic temperature transmitter, a pressure chamber, bleed device, and a valve for selectively providing communications either between th... | 01/06/1981 |
| 4176785 | Automatic temperature controller with night setback and operating as a function of outside air An automatic temperature control system for a building that includes a night setback feature and a morning pickup feature that operates as a function of outside air temperature and wind velocity. A seven day time scheduler and a short cycle auxiliary time... | 12/04/1979 |
| 4156502 | Environmental condition control system The efficiency of an environmental control system such as a heating, ventilating and air conditioning system is enhanced and energy is conserved by starting and stopping the heating or air conditioning modes of operation at variable times at the beginning... | 05/29/1979 |
| 4116380 | Control device for a central heating installation A device for controlling the heating of a hot water boiler includes a first temperature sensor sensing the temperature of the boiler liquid and operating means adapted to switch a control switch. It also includes an outside temperature sensor to be arrang... | 09/26/1978 |
| 4102495 | Heat control device A programmable device for controlling the amount of heat supplied to a building by opening and closing a circuit to a heat source such as an oil or gas burner or a steam valve during predetermined times and in response to the temperature of the outside ai... | 07/25/1978 |
| 4089462 | Temperature control system including K-Factor adjustment A temperature control system having heating and cooling means is provided with a means for automatically shifting the temperature control point in accordance with the outdoor ambient temperature and the K-Factor of the room in which the temperature contro... | 05/16/1978 |
| 4040565 | Control unit for thermal conditioning systems A control unit for a temperature regulating system for heating or cooling a space includes an analog network, responsive to various variable environmental factors and simulating various fixed environment or building factors, is connected to a condenser to... | 08/09/1977 |
