Did You Know...
...that a workman who left the soap mixing machine on too long was responsible for making Ivory Soap? He was so embarrassed by his mistake that he threw the mess in a stream. Imagine his dismay when the evidence of his error floated to the surface! Result: Ivory soap, the soap that floats.
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| Number | Title | Issue Date |
| 7296426 | Interactive control system for an HVAC system An interactive system for controlling the operation of an HVAC system is provide that comprises a thermostat for initiating the operation of the HVAC system in either a full capacity mode of operation or at least one reduced capacity mode of operation, and a control... | 11/20/2007 |
| 7188760 | Counting apparatus A counting apparatus for counting the number of persons in an establishment. The counting apparatus includes a housing being designed for being held in a hand of a user. An intake assembly is coupled to the housing. The intake assembly is designed for being actuated... | 03/13/2007 |
| 7188002 | Appliance diagnostic display apparatus and network incorporating same An appliance diagnostic display and interface system providing a centralized user interface for appliance diagnostic information and control of system self-tests is provided. This centralized user interface is provided via an intelligent thermostat that includes an ... | 03/06/2007 |
| 7156720 | Substrate holding apparatus A substrate holding apparatus can accurately control temperature of a substrate in a direct manner with a relatively simple arrangement. The substrate holding apparatus has a top ring configured to hold a substrate to be polished and press the substrate against a po... | 01/02/2007 |
| 7083109 | Thermostat having modulated and non-modulated provisions A thermostat providing modulated or analog control of valves or dampers of an air management system. This permits operating a single cooling or heating stage with partially open valves or dampers as needed, since one full stage that is either fully on or off may not... | 08/01/2006 |
| 6904968 | Method and apparatus for individually cooling components of electronic systems A cooling system is configured to supply individually metered amounts of cooling fluid to heat generating components of an electronic system. The cooling system includes at least one variable speed fan configured to supply fluid through a centralized plenum and ther... | 06/14/2005 |
| 6705533 | Digital modulation for a gas-fired heater A method is disclosed for operating a gas-fired heater to maintain temperature within a zone. The gas-fired heater is modulated between a higher firing rate and a lower firing rate within a pseudo steady-state mode until a current firing rate exceeds a predetermined... | 03/16/2004 |
| 6505099 | Radiant energy control system In a radiant energy heating system having one or more types of radiant energy heating sub-systems, a control system comprising a solid state electronic control panel pre-programmed to control two or more of the types of radiant heating sub-systems, wherei... | 01/07/2003 |
| 6450409 | Method and apparatus for wiring room thermostat to two stage HVAC system A control used in a two stage HVAC system has a power supply from a 24 VAC transformer which is full wave rectified (D1, D2, D3, D4) to create DC voltages for a microcontroller (U1) and relays (K1-K3). All of the control information needed for the two sta... | 09/17/2002 |
| 6247898 | Computer fan speed control system A cooling system for cooling components of a computer is provided. The cooling system includes a DC fan which operates at a speed which is substantially proportional to the voltage that is applied to the fan. A zener diode voltage divider is connected in ... | 06/19/2001 |
| 6244515 | Universal two stage gas furnace ignition control apparatus and method A gas furnace control for two stage gas furnaces which can be used with either a single stage or a two stage room thermostat monitors the length of time the first, low combustion, stage is energized and upon exceeding a selected period of time, e.g., 10 m... | 06/12/2001 |
| 6230979 | Controller for two-stage heat source, usable with single and two stage thermostats A controller for a two-stage heat source that can be used with a single stage or a two stage thermostat. The controller includes a second stage delay timer that initiates second stage heating when the timer is decremented to zero. The timer is reset when ... | 05/15/2001 |
| 6179212 | Variable output multistage gas furnace A high turn down ratio furnace is attained by plural burners or burner stages having control valves operated by thermal sensors. Heat output control is by a variable pressure device for the fuel supplied to the burners and individual on-off valves for som... | 01/30/2001 |
| 6138467 | Steady state operation of a refrigeration system to achieve optimum capacity A method of operating a refrigeration system in steady state operation drives the refrigerant system to the lowest capacity state which is still able to maintain operation within acceptable pressure and temperature limits. Generally, the system seeks to m... | 10/31/2000 |
| 5806762 | Airless atomizing nozzle and system for humidity control An atomizing nozzle assembly, comprises a body; a nozzle head secured to the body, the nozzle including a chamber and an orifice for permitting water to flow out; a stem disposed within the chamber, the stem including a tip adapted to slide into or out of... | 09/15/1998 |
| 5806760 | Furnace controller useable, without modification, with either a single or two stage thermostat An electronic two stage furnace controller may be used interchangeably, without modification thereof, with either a single or two stage thermostat to regulate the heating and cooling operation of a two stage heating/cooling furnace to which the controller... | 09/15/1998 |
| 5405079 | Method of providing auxiliary heat during primary heat pump lock-out In a heating system with a plurality of heat sources, wherein at least a first heat source is normally activated at a first, higher ambient temperature and at least one additional heat source is normally activated at a second, lower ambient temperature, a... | 04/11/1995 |
| 5400962 | System and method for reduced purge operation of a forced draft burner in a water heater A system and method for controlling operation of a water heater provides generating a heating demand signal which a minimum level corresponds to a required heat input for maintaining water temperature in the water tank in case of no exogenous demand for w... | 03/28/1995 |
| 5369597 | System for controlling heating or cooling capacity in heating or air conditioning systems A heat pump or air conditioning system includes a process for calculating on a real time basis the capacity contribution of each of a number of heating or cooling stages. The calculated contribution is utilized to determine the number of stages that need ... | 11/29/1994 |
| 5341577 | Drying method of and drying apparatus for powder and granular material Carbon black is introduced into a granulating machine 3 through an inlet 1 and water is introduced into the same through an inlet 2 to prepare granulated carbon black, which is fed to a cylindrical rotary type dryer 5 through a line 4 and is dried. A prod... | 08/30/1994 |
| 5317670 | Hot water storage system A hot water system for connection to a water supply and a local hot water usage system, comprising a plurality of series-connected reserve tanks and demand tanks for receiving water from the water supply, heating the received water to a desired temperatur... | 05/31/1994 |
| 5271556 | Integrated furnace control An HVAC controller including a first input; a second input; first means, responsive to a first signal received on the first input, for generating a first mode of operation; second means, responsive to a second signal received on the second input, for gene... | 12/21/1993 |
| 5172654 | Microprocessor-based boiler controller A microprocessor-based sequencer for a multiple boiler heating system which allows the plural boilers to operate in a base load mode whereby one or more boilers can be made to operate at their optimum operating points and as the heating demand changes, a ... | 12/22/1992 |
| 5119884 | Multiple stage electronic temperature control for heating and cooling A control device for energizing and de-energizing temperature changing devices having a primary control unit and a secondary control unit is provided. The primary control unit includes means for sensing an external temperature and generating a signal (Ps)... | 06/09/1992 |
| 4696427 | Method of transforming a pre-existing heat installation, and control device for implementing the method The present invention relates to transforming a pre-existing heating installation comprising a main heat generator such as a boiler which is associated with a modulating mixer valve controlled by a P or PD type regulator which is responsive to outside tem... | 09/29/1987 |
| 4534321 | Apparatus for controlling a number of boilers The disclosure relates to an apparatus for controlling a number of boilers which are, in terms of water engineering, interconnected in series and each are provided with their control equipment having a first and a second switch, the first switch being arr... | 08/13/1985 |
| 4445567 | Thermostat for control of an add-on heat pump system A two-stage thermostat means for an add-on heat pump installation provides separated control of a furnace and a heat pump. The two-stage thermostat means utilizes a single pole, single throw switch means, and a single pole, double throw switch means to pr... | 05/01/1984 |
| 4427055 | Heating and cooling system using ground water A forced air heating and cooling system employs a water source heat pump as the primary heating source and as a back-up or supplementary source of cooling. Supplementary heating is supplied by an electrical heater such as resistance heater, while primary ... | 01/24/1984 |
| 4412581 | Heating installation comprising a boiler and a heat pump The invention relates to a heating installation which includes a boiler and a heat pump. The heat pump has a multi-stage compressor. Graded threshold value operating switches for the multi-stage compressor and the boiler are provided. A control unit which... | 11/01/1983 |
| 4350144 | Hot water heating system A system for heating domestic hot water includes solar collectors for raising the temperature of the water in the usual hot water storage tank. When a tap is opened, the water is drawn out of the tank and directed through a mixing valve which checks the t... | 09/21/1982 |
| 4332352 | Multistage thermostat using integral initiation change means A multistage thermostat is operated by comparing the thermostat setpoint and the sensed temperature over a continuous series of discrete intervals of time. When a sudden change occurs between the sensed temperature and the setpoint, the magnitude of this ... | 06/01/1982 |
| 4325224 | Method and apparatus for transport refrigeration system control A transport refrigeration system having the capability of either heating or cooling at high or low speed and with the compressor loaded or unloaded is controlled by a temperature control system including a heat relay 1K and a speed relay 2K, and has an au... | 04/20/1982 |
| 4302663 | Control system for a heater A space heater having two heating elements and a motor/fan combination for circulating air over the heating elements to supply heated air to an environment includes a system for controlling the operation of the heating elements and the motor in response t... | 11/24/1981 |
| 4293027 | Control system for heating and cooling units A control system for space heating and cooling units which includes modulated damper means for controlling entry of outside air. Temperature sensitive resistances sense the outside air temperature, the temperature in the space, and the temperature of retu... | 10/06/1981 |
| 4272012 | Method and system for controlling a plurality of temperature conditioning units A plurality of temperature conditioning units are divided into groups with the groups being sequentially and repetitively, one after the other, enabled for a first preset number of timing intervals and then disabled for a second preset number of timing in... | 06/09/1981 |
| 4270362 | Control system for an air conditioning system having supplementary, ambient derived cooling Temperature and humidity electrical/electronic control circuits and apparatus to maintain a room at a constant temperature and humidity. The control system is adapted to an environmental condition controller for year-around cooling utilizing a liquid reci... | 06/02/1981 |
| 4259847 | Stepped capacity constant volume building air conditioning system An air conditioning system is disclosed in which the air conditioning capacity is stepped to a lower level upon reduced sensible air conditioning demand. The stepped reduction involves both a stepped reduction of blower capacity and a stepped change of th... | 04/07/1981 |
| 4248053 | Dual capacity compressor with reversible motor and controls arrangement therefor In the main intended application of the arrangement according to the invention, that is, using a reversible motor compressor in a heat pump in a refrigerating or air conditioning system, it is desirable to insure a delay during reversal of the direction o... | 02/03/1981 |
| 4241871 | Apparatus and method for ventilation of animal enclosures An automatic ventilation system for an enclosure for animals, fowl and the like, whereby plural banks of exhaust fans are controlled by respective thermostats set for operation at respective individual temperatures over an operating range of temperatures,... | 12/30/1980 |
| 4199690 | Control system for actuators which can be separately energized and deenergized A control system for actuators which can be separately energized. The controller of the system has a two-position control unit and a three-position control unit and is followed by constant current source circuits, a stepping switch unit with threshold swi... | 04/22/1980 |
