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| Number | Title | Issue Date |
| 7470176 | Converting existing prior art fume hoods into high performance low airflow stable vortex fume hoods The present invention provides a method and conversion kits, that include all necessary components, to convert any style existing prior art fume hood into a stable vortex high performance low airflow fume hood that can accommodate varying size prior art fume hoods w... | 12/30/2008 |
| 7326340 | System for controlling sulfide generation Systems and methods for reducing odors utilizes oxidation-reduction potential to characterize the quality of water or wastewater and control addition of a species thereto that reduces or inhibits biological sulfide generation. Oxidation-reduction potential is measur... | 02/05/2008 |
| 7320636 | Exhaust fan assembly having flexible coupling An exhaust assembly is provided for expelling contaminated air from a building. The assembly includes a plenum, a fan assembly attached to the plenum, and a windband mounted on top of the fan assembly. The fan assembly is constructed of cylindrical outer and inner w... | 01/22/2008 |
| 7318771 | Air-isolator fume hood The present invention is a fume hood capable of exhausting contaminant, having an air pipe in a sash and a suction slot corresponding to the air pipe deposed at the front rim of the bottom surface to obtain an air curtain, where contaminant is efficiently prevented ... | 01/15/2008 |
| 7275533 | Pressure controller for a mechanical draft system Systems and method for controlling the flow of air through a mechanical draft system are disclosed herein. A pressure controller for controlling air pressure comprises an appliance controller configured to control the operation of a plurality of appliances, an intak... | 10/02/2007 |
| 7258280 | Damper control in space heating and cooling An amount of time that air has been delivered from an air handler to a space is tracked, and based on the tracked amount of time, at least one turn-on time or one turn-off time of the delivery of air from the air handler to the space is controlled. Other features re... | 08/21/2007 |
| 7247087 | Fume hood with air directing member A fume hood adapted to be connected to an exhaust system, the fume hood including a cabinet formed with a chamber having a generally flat bottom wall and a sash door mounted at the front end of the chamber for movement in a vertical plane to provide an access openin... | 07/24/2007 |
| 7209840 | Systems and methods for providing remote monitoring of electricity consumption for an electric meter A system for providing remote monitoring of electricity consumption is provided. In one embodiment the system may comprise electric meters, communication devices having a unique address and defining a wireless communication network, and a site controller. Each elect... | 04/24/2007 |
| 7198567 | Desktop-type ventilation system A desktop-type ventilation system generally includes a ventilation hub having at least one vent and at least one fume hood connected thereto. The fume hood(s) generally include a pair of side walls, wherein each is disposed at an angle for directing and causing air ... | 04/03/2007 |
| 7155344 | Distributed database for analytical instruments Techniques for controlling analytical instruments are provided. A sequence of steps can be utilized to specify wells of a microfluidic device, mobility to be applied to fluid in the wells, and the duration to apply the mobility. For example, fluids can be sequential... | 12/26/2006 |
| 7147168 | Zone control of space conditioning system with varied uses A space conditioning system for a building including production and occupied spaces provides precise control of exhaust and space conditioning equipment by taking into account multiple conditions and by using predictive control. The control method and system are ill... | 12/12/2006 |
| 7053767 | System and method for monitoring and controlling remote devices The present invention is generally directed to a system for monitoring a variety of environmental and/or other conditions within a defined remotely located region. In accordance with one aspect of the invention, a system is configured to monitor utility meters in a ... | 05/30/2006 |
| 7048199 | Kitchen exhaust optimal temperature span system and method An exhaust control system (72) for a commercial or institutional kitchen exhaust system (32) is disclosed in which the exhaust fan speed is optimized for the amount of cooking heat and cooking by-product generated by the cooking units, as well as for c... | 05/23/2006 |
| 7039476 | Control system with filtered dead zone A method of operating a control device having a setpoint value, an error signal, and a control output is disclosed. The error signal is representative of a difference between a controlled variable and the setpoint value, the control output operable to affect the con... | 05/02/2006 |
| 7001263 | Air flow monitoring and control system with reduced false alarms An air flow monitoring and control system with reduced false alarms includes an alarm sensor for monitoring air flow in a fume hood or the like, set to provide a warning if air flow drops below a predetermined amount. A local controller monitors the alarm, and disab... | 02/21/2006 |
| 6994619 | Optical sash sensing system for fume hoods A fume hood optical sash sensing system for controlling the flow of air into a fume hood to maintain a constant face velocity by utilizing an optical sensing device mounted inside the fume hood that can sense the movement of a sash based on repeatable reflexive tape... | 02/07/2006 |
| 6974380 | Laboratory air handling unit The invention is an air handling system that is shared between a laboratory and offices within the same building. The normally separate office and lab systems have been combined by way of an air return system that draws air from the offices and feeds into both the o... | 12/13/2005 |
| 6960126 | Wireless communication for fume hood control A method and apparatus for controlling a fume hood. A containment condition, i.e., a condition that may affect containment of potentially harmful substances in the hood, may be detected, and information regarding the detected condition sent by wireless signal. A fum... | 11/01/2005 |
| 6935943 | Wireless communication for fume hood control A method and apparatus for controlling a fume hood. A containment condition, i.e., a condition that may affect containment of potentially harmful substances in the hood, may be detected, and information regarding the detected condition sent by wireless signal. A fum... | 08/30/2005 |
| 6923715 | Device for regulating the air volume flow for a vent in a laboratory A device for regulating the air volume flow for a laboratory exhaust, has a rectangular housing (6) which can be arranged on the laboratory exhaust. The device is equipped with inflow devices that can be connected to the interior of the laboratory exhaust and... | 08/02/2005 |
| 6890252 | Fume hood exhaust stack system A fume hood exhaust stack system (10) and method utilize a variable speed fan (24) and an exhaust stack (28) having an adjustable cross-sectional area. Toxic exhaust from one or more fume hoods (12) is conveyed through a header (16... | 05/10/2005 |
| 6739967 | Fume hood management system A fume hood management system includes a collection section and a server apparatus. The collection section collects data representing an operation state from a plurality of fume hoods. The server apparatus includes an arithmetic section. The arithmetic section calcu... | 05/25/2004 |
| 6699119 | Electronically regulated self-controlled ventilation unit A ventilation unit is provided comprising an electronically driven ventilator, mounted inside a casing wherein emerge several ducts connected to one or several rooms. Said unit further comprises orifices with specific cross-section, and a differential-pre... | 03/02/2004 |
| 6669547 | Multi-stack exhaust system A multi-stack exhaust system and method including at least one fume hood, multiple exhaust stacks, each stack having a return duct with a return damper and a discharge duct with a discharge damper, a fan, a flow sensor, a first static pressure sensor for ... | 12/30/2003 |
| 6634939 | Ventilation system and method A ventilation system includes one or more exhaust fans and one or more make up air fans. Each fan has is driven by a motor operating at a constant speed. Each fan and motor are coupled by a torque converter, so that the torque applied to the fan is consta... | 10/21/2003 |
| 6626971 | Method and device for protecting persons and/or products from air-borne particles The invention relates to a method and a device for separating at least two physical areas (1, 2) and for reducing the transmission of air-borne particles between said physical areas so as to protect persons and/or products (26) from said air-borne particl... | 09/30/2003 |
| 6561892 | Sash sensing system and method A sash position sensing system for a fume hood (10) and the like having a plurality of movable sashes (12a, 12b, 12c, 12d) in a frame includes an indicator element (24) affixed to each sash and an array (20) of sensor elements (22) extending along the fra... | 05/13/2003 |
| 6358137 | Laboratory fume hood control apparatus having rotary sash door position sensor A fume hood control apparatus for controlling the flow of air through the fume hood in a manner whereby the effective size of the total opening to the fume hood, including the portion of the opening that is not covered by one or more sash doors will have ... | 03/19/2002 |
| 6309294 | Lab-hood vent system A generally closed lab hood having an opening closable by a movable door and connected to a variable-throughput suction source has a vent-control system having a sensor for detecting a velocity of flow of air into the hood and for generating an output cor... | 10/30/2001 |
| 6272399 | Method and system for maintaining a desired air flow through a fume hood The present invention pertains to a system for controlling a fume hood with a face. The system comprises a device for controlling air flow through the fume hood based on air flow face velocity. The controlling device has a device for measuring pressure at... | 08/07/2001 |
| 6192922 | Airflow control valve for a clean room An airflow control valve for a clean room having a duct section with a damper positioned within the duct. The damper being capable of an adjustment from an open position to a closed position. The opening and closing of the duct is accomplished through a m... | 02/27/2001 |
| 6152818 | Flow control apparatus for a semiconductor manufacturing wet bench Apparatus for controlling the volume of air that is supplied and exhausted from a electronic semiconductor manufacturing wet bench is disclosed. The volume of air that is exhausted from the wet bench is increased during predetermined portions of the manuf... | 11/28/2000 |
| 6102070 | Safety valve for a containment chamber The present invention relates to a safety valve for a containment (16) comprising a tubular body composed of a main branch (11) and a secondary branch (12) connected to said main branch (11) and opening into it via an aperture in the side of said main bra... | 08/15/2000 |
| 6071188 | Damper and exhaust system that maintains constant air discharge velocity An exhaust system has an air exhaust duct having a charge opening and a discharge opening and defining an air flow path. A damper is mounted in the duct for maintaining a constant air velocity for air exiting the discharge opening. The damper has opposing... | 06/06/2000 |
| 6059260 | Fume hood exhaust terminal having an ultrasonic motor drive actuator A fume hood exhaust terminal for controlling gas flow in an exhaust duct has an electrically powered ultrasonic motor driven actuator for angularly positioning a damper in the terminal. The circuitry of the terminal includes a power failure detection circ... | 05/09/2000 |
| 6033302 | Room pressure control apparatus having feedforward and feedback control and method A controller for heating, ventilating and air-conditioning distribution systems, which includes a feedforward and feedback control strategies. The controller has a feedforward control strategy that generates a control signal based on control set points an... | 03/07/2000 |
| 5951394 | Controller to maintain a certain set of environmental parameters in an environment This invention continuously monitors the differential pressure between two environments, and dynamically adjusts the air handling system of the controlled environment to maintain a desired differential pressure setpoint by using a closed loop control meth... | 09/14/1999 |
| 5946221 | Method and system for maintaining a desired air flow through a fume hood The present invention pertains to a system for controlling a fume hood with a face. The system comprises a device for controlling air flow through the fume hood based on air flow face velocity. The controlling device has a device for measuring pressure at... | 08/31/1999 |
| 5924920 | Fume hood having a bi-stable vortex The flow of air through a fume hood is optimized by producing a bi-stable vortex within the vortex chamber of the fume hood regardless of sash movement. A bi-stable fume hood optimizes capture face velocity to minimize backflow of fume laden air through t... | 07/20/1999 |
| 5882254 | Laboratory fume hood controller utilizing object detection A fume hood controller includes detection apparatus for detecting the presence of objects within the fume hood and reduces the flow through the fume hood if there are no objects within the hood, thereby conserving energy costs associated with conditioning... | 03/16/1999 |
