Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7347774 | Remote autonomous intelligent air flow control system and network The present invention provides one or more autonomous in-duct or register grill mounted flow control devices, each of which has the capability to restrict or boost air flow through the duct or vent to which it is attached. The individual flow control devices may be ... | 03/25/2008 |
| 7272452 | Controller with configurable connections between data processing components A controller with configurable connections between data processing components that is optimized to provide a particular function such as temperature control is provided. In one embodiment, the controller includes a number of configurable inputs and outputs that may ... | 09/18/2007 |
| 7059536 | Air circulation system An air circulation system for use with or without ductwork having an outside air stream and a return air stream includes a controller and a return damper apparatus operatively connecting the return air stream to the controlled environment. The air circulation system... | 06/13/2006 |
| 7024258 | System and method for model-based control of a building fluid distribution system A system and method generates test vectors and a corresponding test program to manipulate terminal units in a building system so pressure and flow measurements correspond to independent modeling equations. The pressure and flow responses of the building system to th... | 04/04/2006 |
| 6688531 | Method of and system for controlling an air conditioner A method and system for staging the cooling effect of an air conditioning unit in which outside air is substantially prevented from passing through the cooling unit for a prescribed time after the cooling function has been initiated.... | 02/10/2004 |
| 6684653 | Air-conditioner and air-to-air heat exchange for closed loop cooling Closed loop cooling is provided by means of a mechanical air conditioner combined with an air-to-air heat exchanger. Three basic modes of operation maximize cooling while minimizing energy consumption, depending on ambient air temperature. In the first mo... | 02/03/2004 |
| 6634422 | Method for controlling an economizer A method of controlling an economizer is provided. A heating, ventilating, and air conditioning unit is operated in one of a heating mode and a cooling mode to provide conditioned air to a plurality of zones. A first temperature representative of air retu... | 10/21/2003 |
| 6491094 | Control for a heating ventilating and air conditioning unit A control system for a heating, ventilating, and air conditioning unit having a heating stage, a cooling stage, and an economizer is provided. The system includes a memory configured to store a first predetermined temperature range and a second predetermi... | 12/10/2002 |
| 6488081 | Method for controlling a heating ventilating and air conditioning unit A method for controlling a heating, ventilating, and air conditioning unit is provided. A conditioning unit having a heating stage, a cooling stage, a fan, and an economizer is operated to provide supply air to one or more zones. The temperature of air in... | 12/03/2002 |
| 6176305 | Ventilator system and method The ventilator system and method use a isolating heat exchanger to selectively transfer heat between exhaust air leaving an enclosed space and outside air entering the enclosed space. The system operates in three basic modes, under the control of a microp... | 01/23/2001 |
| 6145750 | Ventilator for beneath enclosed structures An apparatus for ventilating the crawl space of a structure, comprising an exhaust fan adapted to at least partially occlude an aperture in a structure and oriented to, upon receiving an appropriate stumulus, exhaust crawl space air through said aperture ... | 11/14/2000 |
| 5971067 | Air quality control system The present invention is a system for controlling the quality of air in a building. The system includes a sensor disposed for sensing the air quality in a building. Upon a sensing of an air quality problem, the system issues a command to draw in additiona... | 10/26/1999 |
| 5881806 | Air distribution fan and outside air damper recycling control A system for controlling the operation of an air distribution fan and the operation of a motorized outside air damper of an air conditioning system, having heating and/or cooling and/or humidifying and/or dehumidifying operating modes. The system includes... | 03/16/1999 |
| 5791408 | Air handling unit including control system that prevents outside air from entering the unit through an exhaust air damper A control system for controlling an air handling unit. The control system links the position of an exhaust air damper and a recirculation air damper so as the exhaust air damper is opened, the recirculation air damper is closed the same amount, and vice v... | 08/11/1998 |
| 5485878 | Modular air conditioning system A heating, ventilation, and air conditioning (HVAC) system is disclosed which is capable of receiving interchangeable ventilation modules having varying degrees of air mixing abilities. A ventilation module fits inside the HVAC system and connects to a re... | 01/23/1996 |
| 4986469 | Method of ventilating an animal enclosure in response to temperature A method of ventilating an animal enclosure such as a poultry house which permits alternating use of powered sidewall ventilation, natural sidewall ventilating and powered tunnel ventilation dependant upon outside temperature, with automatic control of th... | 01/22/1991 |
| 4882913 | Slide plate economizer An economizer has a single sliding door which leads to the indoor section from both the outdoor air inlet and the return air inlet, with the two inlets being separated by a divider baffle. The sliding plate is movable from its fully closed position, where... | 11/28/1989 |
| 4676073 | Cooling apparatus Apparatus using outdoor air as a cooling medium for an enclosed space, including a single thermostat controlling a conventional mechanical refrigeration system and electric fan means, and a temperature sensor responsive to outdoor air temperature which is... | 06/30/1987 |
| 4537035 | Air conditioning system A valve is provided that controls the type of air reaching an air conditioning blower. For example, in one position of the valve, returned, air conditioned air is continually recirculated to the blower without the addition of any fresh air. In another pos... | 08/27/1985 |
| 4519539 | Method and apparatus for regulating an economizer damper using indoor fan air pressure A method and apparatus for regulating an economizer damper using indoor fan air pressure is disclosed. The economizer control includes dampers powered by a motive source regulated by air pressure. An outdoor ambient thermostat and a mixed air thermostat a... | 05/28/1985 |
| 4478056 | Economizer control assembly for regulating the volume flow of outdoor ambient air An economizer assembly is disclosed wherein a sliding door is utilized for covering an outdoor ambient air opening allowing outdoor ambient air flow into a space to be conditioned. A motor shaft arrangement connected via a rotating drive rod is utilized t... | 10/23/1984 |
| 4385503 | Air conditioning apparatus for vehicle When a temperature inside a vehicle cabin is higher than a temperature outside the cabin, a full cooling mode of operation is started by moving an outside/recirculated air selector door to a first position where 100% outside air will be supplied to replac... | 05/31/1983 |
| 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 |
| 4271898 | Economizer comfort index control A control circuit for a typical home heating and cooling system, including means to control relative humidity, is shown. The control circuit includes a standard 24 volt transformer in conjunction with a thermostat selector switch and a fan selector switch... | 06/09/1981 |
| 4215408 | Temperature control of unoccupied living spaces Apparatus is provided for controlling, during unoccupied periods, the operation of an HVAC system and perimeter heating system providing hot air and hot fluid, respectively, to a temperature controlled living space having occupied and unoccupied periods, ... | 07/29/1980 |
| 4186564 | Air ventilation system An economizer system for air conditioning uses a space thermostat to determine a demand for cooling and an outside air controller to determine whether cooling shall be mechanical or natural. A mixed air controller senses the temperature of the mixture of ... | 02/05/1980 |
| 4086781 | Variable air volume air conditioning system A variable air volume air conditioning system is provided with thermostat controlled variable air volume terminal boxes for controlling the volume of constant temperature conditioned air provided to each space to be conditioned. The conditioned air is del... | 05/02/1978 |
| 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 |
