Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7325749 | Distributed solid state programmable thermostat/power controller A self-contained power controller having a power driver switch, programmable controller, communication port, and environmental parameter measuring device coupled to a controllable device. The self-contained power controller needs only a single voltage source to powe... | 02/05/2008 |
| 6109531 | High reliability heating system A high reliability heating system that includes dual furnace control mechanisms wherein each furnace control mechanism includes blowers and control elements and each is independently operable to control the operation of a shared furnace burner unit and he... | 08/29/2000 |
| 5592989 | Electronic thermostat having high and low voltage control capability An electronic thermostat having high and low voltage control capability and varied functional capabilities. The thermostat is particularly suited for use with fan coil heating and cooling units. Specifically the thermostat uses relays to actuate external ... | 01/14/1997 |
| 5355938 | Temperature control device A temperature control device with high accuracy and stability comprising a heating device and a cooling device which are controlled by separate control circuits for performing proportional control, integral control, derivative control and the like. A rati... | 10/18/1994 |
| 5304781 | Two terminal line voltage thermostat A two terminal line voltage thermostat includes a switch which connects one side of the line voltage to a heater load (that it drives) such as a baseboard heater with the other side of the heater being connected to the other side of the line. Common full ... | 04/19/1994 |
| 4919196 | Three-stage mercury switch for operation between the heating and cooling mode There is disclosed a thermostat controlled apparatus which controls the operation of a heating system and a cooling system in response to temperature variations in a given environment. The thermostat has a three-electrode mercury switch which is coupled t... | 04/24/1990 |
| 4775099 | Thermostatic control apparatus for operation between the heating and cooling mode There is disclosed a thermostat controlled apparatus which operates to control operation of a heating system and a cooling system in response to the temperature detected in a given environment. The thermostat has a pair of mercury switches which are coupl... | 10/04/1988 |
| 4773472 | Control device for a refrigerating apparatus of a vending machine A temperature control device is disclosed for use in a vending machine having a plurality of storage chambers. The temperature control device includes a refrigerating apparatus provided with a plurality of evaporators which are connected in parallel and d... | 09/27/1988 |
| 4530608 | Baseline control for a differential scanning calorimeter A differential scanning calorimeter includes a baseline correction apparatus which simultaneously corrects for both linear and curvilinear heat flow variation between the sample and reference holders.... | 07/23/1985 |
| 4406399 | Method of controlling an enamelling oven Disclosed is a method of controlling an enamelling oven, in which a plurality of controlled variables such as temperatures: including a plurality of measured variables: are variable by any one of a plurality of manipulation variables such as the degrees of ope... | 09/27/1983 |
| 4380317 | Furnace control In a process in which a furnace having multiple coils is utilized to heat a fluid stream, a comparison of a measured pressure of the fluid stream to a desired pressure is utilized to bias a temperature control system for the furnace which maintains the fu... | 04/19/1983 |
| 4051231 | Production of internal atmospheres for kilns A gas mixer and reactor is provided which includes an elongated gas flow chamber with a nozzle arrangement at its inlet end for passing a first gaseous reactant into the interior of the chamber, toward the outlet of the chamber from points uniformly about... | 09/27/1977 |
| 4004138 | Method of and system for controlling temperature of continuous furnace A method of and system for controlling the temperature of a continuous furnace through which steel bodies are transported at a constant speed, in which the temperature is controlled so as to keep the distance from the entry port of the furnace to a positi... | 01/18/1977 |
| 3981444 | Method for starting a steam-heated heat exchanger by regulating the pressure of the heating-steam The invention involves a closed loop control method and apparatus for starting up a steam-heated heat exchanger by controlling the heating-steam pressure. According to the invention a correcting variable is established by a controller from an actual press... | 09/21/1976 |
