Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 7170388 | Thermostat A thermostat has a switch, a temperature sensor, a lever, a spring, and a control plate. The sensor generates a force to operate switch in response to the ambient temperature. The lever having an arm turns with the force from the sensor to open/close contacts of the... | 01/30/2007 |
| 4788520 | Ratchet means switch operator A switch operator has a low friction ratchet wheel driven by a low power time programmed clock to operate the switch in one position or another depending upon the position of the ratchet wheel to operate the ratchet wheel independent of the time programme... | 11/29/1988 |
| 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 |
| 4549160 | Thermostat control apparatus Apparatus for controlling a water heater thermostat for increased efficiency in fuel usage. A mounting bracket is adapted to fit on several different common types of thermostat control boxes and to removably receive a controller housing. A motor in the ho... | 10/22/1985 |
| 4546918 | Control device with positive temperature coefficient impedance for limiting dissipated power A control device for controlling temperature conditioning apparatus is connected to a thermostatic switch means having a circuit requiring a small current to maintain the circuit active during the open cycle of the thermostat switch means. A positive temp... | 10/15/1985 |
| 4388605 | Defrost thermostat used in a reversible refrigerating cycle for heat pumps A defrost thermostat provided with a timer driven cam mechanism for preventing repetition of defrosting operation shortly after the completion thereof which is apt to be caused due to the temperature lowering of the external unit acting as an evaporator d... | 06/14/1983 |
| 4315595 | Multi-apartment remote time variable temperature regulator and recorder A temperature control and monitoring device for a heater of a building having a plurality of separate areas comprising, a motor having a shaft rotatable at constant speed, a disc connected to the shaft having a pluraliity of radially extending slots, a pi... | 02/16/1982 |
| 4180789 | Time variable thermostat A time variable thermostat for controlling a heater comprising, a temperature activated switch connected to the heater for deactivating the heater at a selected temperature having a movable contact and at least one fixed contact, the movable contact being... | 12/25/1979 |
| 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 |
| 4150718 | Replacement thermostat adapter wall plate An adapter wall plate for mounting a replacement thermostat on a wall wherein the adapter wall plate attaches to the existing wall plate of the thermostat being replaced thereby eliminating the necessity of disconnecting the wires leading from the existin... | 04/24/1979 |
| 4129847 | Cut-back thermostat construction A cut-back thermostat construction having a thermostat arrangement and a timer carried by a housing in such a manner that the timer will cut back the temperature setting of the thermostat arrangement by moving an electrical switch of the thermostat arrang... | 12/12/1978 |
| 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 |
| 4045760 | Cut-back thermostat construction A cut-back thermostat construction having a thermostat arrangement and a timer carried by a frame in such a manner that the timer will cut back the temperature setting of the thermostat arrangement by moving an electrical switch unit of the thermostat arr... | 08/30/1977 |
| 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 |
| 4013219 | Manually actuated, self-expiring, temporary override apparatus and method for thermostatic system A standard thermostat control unit, such as used in residential heating systems, is modified to include a manually actuated, electro-mechanical timer that includes a switch connected across the unit's thermostatically operated contacts, such that actuatio... | 03/22/1977 |
