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"That the automobile has practically reached the limit of its development is suggested by the fact that during the past year no improvements of a radical nature have been introduced."
Scientific American ; Jan. 2 edition, 1909
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| Number | Title | Issue Date |
| 4186315 | Expanded time constant condition control system using a unidirectional counter with multiple channels A condition responsive time proportional control means which has a relatively fast time constant when operating in its proportional band has the time constant expanded by means of a digital counter. The counter is a resettable unidirectional type counter ... | 01/29/1980 |
| 4183466 | Thermally actuated phase change operated control valve for heat pump systems A thermally actuated phase change operated control valve particularly adapted for use with heat pump systems has a valve body having a bore therein defining a fluid flow chamber, said valve body having an inlet port at one end and spaced and sized outlet ... | 01/15/1980 |
| 4182484 | Temperature control for variable volume air conditioning system A temperature control is disclosed for a variable volume air conditioning system of the type wherein electric motor-operated air valve means are provided for varying the volume and relatively warm or relatively cool conditioned air supplied to a condition... | 01/08/1980 |
| 4177860 | Heating and cooling thermostat with changeover switching operated upon control point adjustment A thermostat adapted for controlling heating and cooling apparatuses has a temperature control point adjustment means connected to a changeover switch means whereby upon the adjustment of the temperature control point adjustment means in a first range to ... | 12/11/1979 |
| 4146086 | Furnace blower speed control A combination thermostat and blower speed control for use with an air conditioner for both heating and cooling air which is circulated through an enclosure by a multi-speed blower.The control has a system switch for selecting either a heating or cooling m... | 03/27/1979 |
| 4121655 | Air-conditioning system A package terminal air conditioning system as disclosed having a room air-circulating blower, an air-cooling device, an air-heating device, and a thermostatic control which governs operation of the air-cooling and air-heating devices in response to the te... | 10/24/1978 |
| 4114806 | Thermostatically actuated regulator for a 4-lead air conditioning plant The invention relates to an integrated thermostatic control system for cooling and heating. The control system includes cooling and heating valves and fluid pressure controlled operating elements for the valves. The system has a common sensor and a common... | 09/19/1978 |
| 4109704 | Heating and cooling cost minimization In an air conditioning system having both a hot deck for heating air and a cold deck for cooling air, both decks being supplied by a supply duct, a control system is disclosed for minimizing the total cost of heating the air in the hot deck and cooling th... | 08/29/1978 |
| 4083397 | Heating-cooling control system Thermostat control of separate heating and cooling apparatus is achieved with a system that requires only a two-conductor connection between the thermostat and the apparatus. A pair of oppositely-poled diodes is employed at each end of one of the conducto... | 04/11/1978 |
| 4078601 | Heating and cooling thermostat with changeover switching operated upon control point adjustment A thermostat adapted for controlling heating and cooling apparatuses has a temperature control point adjustment means connected to a changeover switch means whereby upon the adjustment of the temperature control point adjustment means in a first range to ... | 03/14/1978 |
| 4067383 | Heating and cooling system for a multiple coil installation The heating and cooling system for a multiple coil installation includes a bypass passage or conduit provided with a check valve which is closed when the pump of either the heating circuit or the cooling circuit is energized and which is opened when the p... | 01/10/1978 |
| 4055296 | Electronic temperature control system for thermostatic control An electronic temperature control system utilizes a circuit having two main terminals for connection to a low voltage relay control system of the type generally used in residential heating or cooling systems without the need for an auxiliary source of pow... | 10/25/1977 |
| 4035796 | Device for reducing undesired energy consumption in a room provided with heating and/or air conditioning means Disclosed is a simple apparatus for turning off a heating or air conditioning unit when a door or window is opened. Switches activated by the opening of doors or windows control the operation of a heater or air conditioner through a relay system that doub... | 07/12/1977 |
| 4019569 | Burner control circuit A novel control circuit for heating and heating/cooling systems wherein in a heating mode the circuit controls a valve means comprising a main valve and a modulating valve through which gas is supplied to a burner. The main valve is a normally closed, sol... | 04/26/1977 |
| 4019566 | Air conditioning system An air conditioning system for conditioning air in a plurality of enclosed areas in a building. Conditioned air at a relatively cold temperature level is supplied to a terminal for discharge into an area. The quantity of relatively cold temperature air di... | 04/26/1977 |
| 4014381 | Air conditioning system An air conditioning system for conditioning air in a plurality of enclosed areas in a building. Conditioned air at a temperature level which may be varied is supplied to first terminal means for discharge into an area. Conditioned air at a relatively cons... | 03/29/1977 |
| 4007775 | Heat exchange system and method and control device therefor having motion feedback means A heat exchange system having a source of heat exchange output fluid for effecting a heat exchange function and having a source of return fluid resulting from the output fluid providing its heat exchange function. A thermally operated element controls the... | 02/15/1977 |
| 4007780 | Heat exchange system and method and control device therefor A heat exchange system having a source of heat exchange output fluid for effecting a heat exchange function and having a source of return fluid resulting from the output fluid providing its heat exchange function. A thermally operated element controls the... | 02/15/1977 |
| 4007779 | Heat exchange system and method and control device therefor having motion feedback means A heat exchange system having a source of heat exchange output fluid for effecting a heat exchange function and having a source of return fluid resulting from the output fluid providing its heat exchange function. A thermally operated element controls the... | 02/15/1977 |
| 4007778 | Heat exchange system and method and control device therefor having motion feedback means A heat exchange system having a source of heat exchange output fluid for effecting a heat exchange function and having a source of return fluid resulting from the output fluid providing its heat exchange function. A thermally operated element controls the... | 02/15/1977 |
| 3993120 | Space thermostat A space thermostat for controlling the two-stage operation of both heating and cooling apparatus includes two single-pole, double-throw mercury type switches operatively connected to a single bimetallic coil. One switch energizes stage one of the heating ... | 11/23/1976 |
| 3974427 | Motor control apparatus for three position valve A motor control apparatus having an electric motor which is driven in one direction by an alternating current power source and in a return direction by a spring return wherein a holding or braking of the motor is accomplished by the application of a sourc... | 08/10/1976 |
| 3973619 | Heat exchange system and method and control device therefor having motion feedback means A heat exchange system having a source of heat exchange output fluid for effecting a heat exchange function and having a source of return fluid resulting from the output fluid providing its heat exchange function. A thermally operated element controls the... | 08/10/1976 |
| 3952795 | Air conditioning system An air conditioning system for conditioning air in a plurality of enclosed areas in a building. Conditioned air at a temperature level which may be varied is supplied to first terminal means for discharge into an area. Conditioned air at a relatively cons... | 04/27/1976 |
| 3952796 | Temperature control system An automatic temperature responsive control valve is disclosed for use in combination heating and cooling systems including two concentric valve sleeves each rotating individually in the valve body under the control of respective bimetallic transducers on... | 04/27/1976 |
| 3949810 | Air conditioning system An air conditioning system for conditioning air in a plurality of enclosed areas in a building. Conditioned air at a relatively cold temperature level is supplied to a terminal for discharge into an area. The quantity of relatively cold temperature air di... | 04/13/1976 |
| 3935998 | Valve construction and system utilizing the same A three-way changeover valve construction having a housing means provided with an inlet and a pair of outlets. A pair of valve seats are carried by the housing for respectively controlling fluid flow from the inlet through the outlets. A pair of valve mem... | 02/03/1976 |
