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 |
| 5877670 | Heat motor operated load regulating switch assembly and knob attachment therefor A user adjustable switching controller for duty cycle regulating flow of current to an electrical load such as a resistance heater, particularly for cooking appliances. A load current switch, when closed by a user operated cam also energizes a heat motor ... | 03/02/1999 |
| 5805403 | Integrated circuit temperature monitoring and protection system A system of monitoring and protecting integrated circuits against damage due to over temperature conditions functions to monitor the temperature of an IC and either shut down its input clock signal or assert its reset line if case temperatures rise to hig... | 09/08/1998 |
| 4721936 | Double arm time variable thermostat A time variable thermostat comprising, a housing, a clock connected to the housing and having a shaft which is rotatable with time and a disc connected to the shaft for rotation with the shaft. The disc has a plurality of circumferentially spaced slots ea... | 01/26/1988 |
| 4433718 | Thermostatically-regulated arrangement for and method of switching power to a heating/cooling system, and methods of installing and retrofitting the arrangement at an electrical outlet box A line voltage thermostat is replaced by a low voltage clock-controlled thermostat without the need to install a switching relay in the basement of a house. Instead, a transformer-controller adapter unit is mounted within an electrical outlet box at which... | 02/28/1984 |
| 4350966 | Thermostat assembly An adapter converts a conventional thermostat to effectively approximate a setback thermostat. A conventional thermostat includes a mercury switch which is actuated by a bi-metallic coil. The attachment is interposed between the thermostat and its standar... | 09/21/1982 |
| 4123739 | Thermostat control A thermostat control to change the setting of a thermostat to a preselected point and automatically to return the thermostat to the original setting after elapse of a preselected time interval.... | 10/31/1978 |
| 4045759 | Cut-back thermostat construction A cut-back thermostat construction having a frame carrying a timer and a thermostat arrangement. A movable actuator is carried by the frame and is operatively associated with the thermostat arrangement to cut back the temperature setting thereof when the ... | 08/30/1977 |
| 4041325 | Thermostat timer An add-on device for automatically adjusting the setting of a control mechanism, such as, a thermostat, which includes a separate, independent timer which is mounted adjacent the existing control mechanism and controls the same by means of a mechanically ... | 08/09/1977 |
| 4014499 | Temperature control apparatus An improved temperature control apparatus includes a main control unit of the on-off type which is utilized to maintain a room at a relatively high temperature during the day and a secondary control unit which is utilized to maintain the room at a relativ... | 03/29/1977 |
