Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 4054778 | Solid state electronic oven control system A solid state electronic control system for a cooking oven is provided which is particularly adapted for cooking meat. The control system includes a first heat sensor which monitors the internal temperature of the oven, and it also includes a second heat ... | 10/18/1977 |
| 4053733 | Temperature control device A temperature control device in which electric power to be supplied to a heating element is controlled correspondingly to pulse intervals applied to a switch circuit with the pulse intervals adapted to vary according to the temperature of the portion to b... | 10/11/1977 |
| 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 |
| 4039928 | Electrical operating circuit having semiconductor device junction temperature monitoring An operating circuit for a semiconductor switch device of the type that passes electrical current from a source to an electrical load by forward biasing of the semiconductor's control terminal includes a resistance bridge network having in an arm thereof ... | 08/02/1977 |
| 4039778 | Electric cartridge heater with a multiple thermocouple assembly A cartridge heater and multiple thermocouple assembly comprising an elongate outer heavy walled structurally supportive metal sheath, an elongate thin walled, yieldable, orienting metal tube extending through the sheath and defining an annulus, a pluralit... | 08/02/1977 |
| 4036457 | Aircraft de-icing In a method for de-icing aircraft surfaces by means of a plurality of electrical resistance heaters which are sequentially supplied with heating current, the delivery of current to each heater being effectuated during a succession of cycles each constitut... | 07/19/1977 |
| 4034185 | Electric blanket control circuit An electric blanket control circuit is provided which includes an overheat protection circuit to detect an overheat condition as well as a fail-safe testing circuit to assure that the electrical components in said overheat protection circuit are properly ... | 07/05/1977 |
| 4032746 | Control system for a fusing apparatus A control system in which the thermal energy produced by a first heat source and a second heat source cooperating therewith is regulated by adjusting the phase of the voltage applied thereto.... | 06/28/1977 |
| 4024336 | Split bushing control A circuit is described for controlling the temperature of a heating element used to heat molten glass in a bushing from which the molten glass is drawn into glass fibers and in which the bushing is divided into two sections. The circuit includes two tempe... | 05/17/1977 |
| 4013872 | Temperature control device A temperature control device generates a signal proportional to deviations of the temperature from a predetermined set point. This first signal is averaged and a second signal produced in response to it. This second signal deviates from a reference level ... | 03/22/1977 |
| 3998146 | Frying apparatus with compensated thermostat A frying apparatus includes a frypot for containing cooking oil positioned in a support housing. Heating elements are pivotally attached to said housing and suspended within the frypot to heat the cooking oil for deep fat frying. A thermostat is mounted t... | 12/21/1976 |
| 3971876 | Temperature control apparatus The disclosed invention describes an apparatus and method for bringing a system having high interactive portions to a predetermined temperature distribution. The invention includes a difference controller which provides, through two separate drivers, a fi... | 07/27/1976 |
| 3969098 | Control apparatus and system for closely spaced heating elements In an electrical heating element apparatus and control system for tubular glass fiber bushings wherein a plurality of bushings are each individually temperature controlled by a compact power supply and control system and means are provided for mounting an... | 07/13/1976 |
| 3959621 | Thermally sensitive switch device A main thyristor is serially connected to a load across an AC source. A thermally sensitive thyristor is connected at the anode to the anode of the main thyristor through a resistor and at the cathode to the gate electrode of the main thyristor and respon... | 05/25/1976 |
| 3943331 | Temperature control circuit A temperature control circuit is disclosed for controlling the firing angle of a thyristor such as a silicon controlled rectifier connected in series with a heater across an alternating power source. The control circuit comprises a field effect transistor... | 03/09/1976 |
| 3942075 | Semi-conductor thermal protection arrangement A semi-conductor thermal protection arrangement is disclosed for use with class AB, B, or C power amplifiers or in any other circuit configuration wherein a reduction in drive signal at a stage prior to that of the protected semi-conductor results in a le... | 03/02/1976 |
| 3937921 | Temperature control system A temperature control system comprises a heat sink heatable upon application of electric power thereto, an AC power source for heating the heat sink, temperature detector means for detecting the temperature of the heat sink, and control means for controll... | 02/10/1976 |
| 3936786 | Temperature sensitive tipswitch A temperature-sensitive tipswitch includes a pair of normally closed flexible conductive arms. A temperature responsive actuating arm is mounted adjacent the conductive arms and insulation discs separate all three. A bracket is connected into the stack fo... | 02/03/1976 |
