Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 7295010 | Low temperature probe having transmitting coil and receiving coil or transmit/receive coil and used in NMR apparatus In an ultrahigh sensitive NMR apparatus, a stability of a temperature of a very low temperature probe coil is improved. A low temperature probe of the high sensitive NMR apparatus is structured at a very low temperature by a cooling apparatus. A cooling medium at a ... | 11/13/2007 |
| 7261241 | Heating and cooling energy saving device A system for regulating the temperature of multiple areas within a facility using multiple energy savings devices (ESD) that each regulate the temperature of individual rooms or areas within a facility having a central heating and cooling plant. The device includes ... | 08/28/2007 |
| 7216497 | Slope predictive control and digital PID control The present invention provides an airflow control loop that uses averaged airflow measurements without the problems that are normally encountered with averaging measurements, such as the delay introduced into the airflow control loop. This is accomplished, in the pr... | 05/15/2007 |
| 7188779 | Zone climate control A zone climate control system and method of its operation. A zone can be a single room. A method for determining which zones' vents are to be closed, and which are to be opened, in performing heating or cooling, circulation to heat or cool a zone by mixing its air w... | 03/13/2007 |
| 7131490 | Fan coil controller A fan coil controller for a hot and cold water system of a building that turns off the fan while the hot water and cold water coils are flushed. A fan coil control circuit is configured to periodically and temporarily operate a hot water flow control circuit and a c... | 11/07/2006 |
| 6961242 | System fan management based on system loading options for a system having replaceable electronics modules An electronic system has independently coolable first and second zones. The electronic system includes a first zone having a first zone fan and a plurality of first zone connectors for connecting electronic modules and a second zone having a second fan zone and a pl... | 11/01/2005 |
| 6725914 | Double duct changeover HVAC system The invention is a double duct changeover HVAC system, which uses two conditioned air sources to deliver air into two main duct systems. The two main duct systems are routed toward the exterior exposures of a building, and converge into a single duct which is routed... | 04/27/2004 |
| 5931227 | Conversion of constant volume heating/air conditioning systems Constant volume multizone heating/air conditioning systems are converted to variable volume air conditioning systems. Energy conservation is achieved by converting the fan drive from one requiring constant volume air flow. Instead, the volume of air flow ... | 08/03/1999 |
| 5117899 | Air handling apparatus The air handling apparatus provides a separate heating mixing air deck and a separate cooling mixing air deck each with their own return air and outdoor air supplies to maximize indoor air directed to the heating deck and monitor the cooling deck to utili... | 06/02/1992 |
| 4967382 | Programmable time varying control system and method An electronic system and method are disclosed for controlling a measured temperature during a sequence of time intervals, in accordance with a sequence of selected reference temperatures each corresponding to one of the intervals. The values of the refere... | 10/30/1990 |
| 4928750 | VaV valve with PWM hot water coil A refrigeration system for temperature conditioning several comfort zones includes several VAV (variable air volume) valves each having a hot water coil conveying water whose flow rate is regulated by a PWM (pulse-width modulated) solenoid valve. Each VAV... | 05/29/1990 |
| 4630670 | Variable volume multizone system A zoned variable volume system is provided with a pair of non-connected dampers in each zone. The first damper controls flow through a cooling coil. The second damper controls flow through a heating coil and provides heated or neutral air depending upon w... | 12/23/1986 |
| 4531573 | Variable volume multizone unit A variable volume multizone unit is disclosed for simultaneously supplying variable amounts of cool, warm or neutral air to each zone, as required. The unit is under the overall control of a computer and controls dampers located at the unit to regulate th... | 07/30/1985 |
| 4495986 | Method of operating a variable volume multizone air conditioning unit A variable volume multizone unit is disclosed for simultaneously supplying variable amounts of cool, warm or neutral air to each zone, as required. The unit is under the overall control of a computer and controls dampers located at the unit to regulate th... | 01/29/1985 |
| 4300623 | Integrated multi-duct dual-stage dual-cooling media air conditioning system A multi-duct air conditioning system integrating ventilation, humidity control, filtering, chilling and heating, and distribution of liquids, embodied in a combination of means operating at peak efficiency under varied conditions, characterized by a dual-... | 11/17/1981 |
| 4212078 | Computer controlled facility management system (FMS) A central control system includes a central processing unit (CPU) installed in a central location of a facility, and interconnected with a plurality of remote controllers, each located in an associated one of several buildings in the facility and each inc... | 07/08/1980 |
| 4205381 | Energy conservative control of heating, ventilating, and air conditioning (HVAC) systems Electronic processing means, in combination with dedicated sensing apparatus is used to control the operation of an HVAC system which regulates the temperature in one or more temperature controlled spaces. The electronic processing means and associated se... | 05/27/1980 |
| 4187543 | Temperature control of chill water and steam in heating, ventilation, air conditioning (HVAC) systems Apparatus for controlling the discharge temperature of thermal fluid presented from a common thermal source to one or more HVAC systems in a network, each HVAC controlling the volume of thermal fluid circulating therethrough by regulating the valve positi... | 02/05/1980 |
| 4136732 | Method and apparatus for controlling air-conditioning systems An air conditioning system controlled for automatically heating and/or cooling a multiple zone building is disclosed wherein each zone includes a zone temperature responsive load transmitter. Each load transmitter produces an output command signal for con... | 01/30/1979 |
| 4099553 | Variable air volume system A variable air volume system for processing an enclosure is shown and described. The system includes an improved damper assembly, having independently operated damper elements, and an air mover control responsive to the damper assembly.... | 07/11/1978 |
| 4044823 | Method and apparatus for controlling air-conditioning systems An air conditioning system controlled for automatically heating and/or cooling a multiple zone building is disclosed wherein each zone includes a zone temperature responsive load transmitter. Each load transmitter produces an output command signal for con... | 08/30/1977 |
| 4042013 | Method and apparatus for controlling air-conditioning systems An air conditioning system controlled for automatically heating and/or cooling a multiple zone building is disclosed wherein each zone includes a zone temperature responsive load transmitter. Each load transmitter produces an output command signal for con... | 08/16/1977 |
| 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 |
| 4013118 | Control of heating and cooling available from central sources to a multi-zone temperature controlled space Incremental heating and cooling sources are energized and deenergized as required to meet the maximum heating and cooling demands of any of the zones in a temperature controlled space. Common references and comparators are employed for both heating and co... | 03/22/1977 |
| 3994335 | Multizone air conditioning system In a multizone air control system employing constant flows of hot and cold air, the hot or cold air is variably mixed with recirculated air to provide zone temperature control.... | 11/30/1976 |
| 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 |
| 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 |
| 3949807 | Air conditioning system with integral energy conserving elements There is disclosed an air conditioning control system for a building which has zone temperature sensing means for generating a plurality of DC analog signals proportional to the deviation of the air temperature in a controlled zone from first and second s... | 04/13/1976 |
| 3933197 | Control of heating and cooling available from central sources to a multi-zone temperature controlled space Incremental heating and cooling sources are energized and deenergized as required to meet the maximum heating and cooling demands of any of the zones in a temperature controlled space. Common references and comparators are employed for both heating and co... | 01/20/1976 |
