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| Number | Title | Issue Date |
| 7777633 | Method and system for determining particle transmittance of a filter in particle detection system The present invention relates to a system for determining particle transmittance Tx of a filter for use with a particle detection system to provide a filter warning for aspirated particle detection systems by detecting a level of first particles having a ... | 08/17/2010 |
| 7360433 | Filter change indicator A fluid system pressure indicator is adapted for use in fluid systems having a filter element. The fluid system force indicator includes a housing partitioned to be exposed to the fluid system to provide transmission of a mechanical force between these partitioned e... | 04/22/2008 |
| 7354341 | System and method for detecting an air flow condition indicative of plugging of a discharge apparatus of an agricultural combine A system and method for detecting a condition indicative of onset of plugging or actual plugging of discharge apparatus of an agricultural combine, utilizing an air flow sensor disposed in relation to the discharge apparatus for sensing one or more air flow characte... | 04/08/2008 |
| 7303613 | Filter sensor and indicator for vacuum cleaners A pressure actuated electrical switch and indicator to indicate to a user that a filter vacuum cleaner requires cleaning or replacing. In a first embodiment, the pressure actuated electrical switch measures the pressure present between the filter media and the flow ... | 12/04/2007 |
| RE39871 | Particulate detection and air advice provision A novel basic allergen/particulate data collection device and a novel multi-function personal air quality management device are disclosed. Both devices include sensor sub-assembly detecting and reporting on allergen/particulate data (preferably, for allergen/particu... | 10/09/2007 |
| 7261762 | Technique for detecting and predicting air filter condition A method and system for detecting and predicting air filter condition for an air handling system operates by determining a system resistance to air flow. The system resistance is utilized to determine a detection statistic indicative of current filter condition and ... | 08/28/2007 |
| 7253743 | Techniques for identifying when to change an air filter A method is performed in an electronic system having (i) hardware configured to perform electronic operations and (ii) an air filter configured to remove contamination from an air stream that cools the hardware. The method, which identifies when to change an air fil... | 08/07/2007 |
| 7253742 | Method and apparatus for measuring parameters of a fluid flowing within a pipe using a configurable array of sensors An apparatus for measuring at least one parameter associated with a fluid flowing within a pipe includes a spatial array of pressure sensors disposed at different axial locations x1. . . xN along the pipe. Each of the pressure sensors provides ... | 08/07/2007 |
| 7213464 | System for visually monitoring pressure in an enclosed space A compliant balloon having an outer reflective surface which is positioned next to a transparent window which has an opaque element thereon, the reflection of the opaque element from the outer reflective surface of the balloon being visible when the outer reflective... | 05/08/2007 |
| 7182855 | Fuel filter with valve indicator A fuel filter includes a first filter chamber, a second filter chamber and a valve assembly disposed between the first and second filter chambers. The valve assembly includes a valve casing with a valve head connected to a flag indicator slidably disposed within the... | 02/27/2007 |
| 7174273 | Filter monitoring system A filter monitoring system employs a differential pressure sensor to provide a continuous signal output proportional to a pressure drop across a filter element. The differential pressure sensor communicates with a controller that provides output signals to indicate ... | 02/06/2007 |
| 7152468 | Illuminated rain gauge An illuminated rain gauge comprising an elongated, transparent collection vessel or tube having upper and lower ends with the lower end thereof being closed by a plug and which has a funnel-shaped collector at the upper end thereof. A support is positioned within th... | 12/26/2006 |
| 7150824 | Method for determining when to replace a filter having a pressure relief valve A fluid filter assembly having a relief valve for visually indicating when a filter element may be replaced. The fluid filter assembly of the present invention provides a vertical, transparent housing having a fluid inlet for communicating a fluid into the housing a... | 12/19/2006 |
| 7150408 | Programmable thermostat incorporating air quality protection The invention is directed to programmable temperature control in which a controller may be programmed to control a thermal output of said temperature-modifying device, and to operate an air circulating system independently of the temperature-modifying device. The ap... | 12/19/2006 |
| 7124627 | Air filter restriction sensor assembly An air filter restriction sensor assembly for use on an engine, such as a small gas engine provides a simple on/off system with remote indicating to notify the operator of the air restriction. More specifically, the air restriction in the air intake line of the engi... | 10/24/2006 |
| 7114391 | Liquid level detection apparatus There is provided a liquid level detection apparatus for detecting the level of a liquid, including a pair of first electrodes, a pair of second electrodes arranged at a different height to that of the first electrodes, a pair of electrode leads having respective en... | 10/03/2006 |
| 7098779 | Method of providing notification of an air intake restriction Notification of an air intake restriction is provided for an internal combustion engine (101). Readings from one or more air pressure sensors (117, 119) utilized with an internal combustion engine (101) are processed to determine whether an air ... | 08/29/2006 |
| 7091868 | Portable liquid level detector A portable liquid level detector. The detector comprises a portable casing, a power supply unit disposed in the portable casing, a sensing device coupled to the power supply unit to sense a capacitance within a container and to output a enable signal when a differen... | 08/15/2006 |
| 7084778 | Ammonia flow alarm and method therefor A sensor system for monitoring cryogenic gas flow through a tube/pipe has at least one sensor coupled to the tube/piping. An alarm circuit is coupled to the sensor for receiving measurement signals from the at least one sensor and for sending an alarm signal when th... | 08/01/2006 |
| 7075261 | Method and apparatus for controlling a fan A method and apparatus for controlling a fan is disclosed. In one embodiment, a method for controlling a fan includes applying power to the fan at startup. The fan may be supplied a predetermined amount of current, which may break the inertia of the fan propeller an... | 07/11/2006 |
| 7075425 | Apparatus and method for monitoring sewer system operation Disclosed are methods and apparatus for monitoring a plurality of grinder pumps, and in particular, remotely over a communications network. Aspects of the invention include an alarm panel having a modular configuration, a modem board which allows use of a single tel... | 07/11/2006 |
| 7068506 | Removable memory storage device carrier having a heat sink A device for removably mounting a hard disk drive in a memory storage housing, includes a carrier for holding a hard disk drive. The carrier being removably mountable in a memory storage device housing. The device also includes a heat sink mounted on the carrier. Th... | 06/27/2006 |
| 7032573 | Method and apparatus for indicating air filter maintenance is required A system and method for indicating required maintenance of an air filter used with an internal combustion engine. The system includes a throttle plate for adjusting an amount of airflow passing into cylinders of the engine. The system includes a throttle plate posit... | 04/25/2006 |
| 7030766 | Ambient condition detector with multi-function test A device with a multi-function test feature for assessing or directing multiple sensor functions is provided for monitoring and interrogating air flow through Heating/Ventilation/Air-conditioning (HVAC)-type ducts for changes to ambient conditions such as smoke, hea... | 04/18/2006 |
| 7015820 | Apparatus for monitoring a smoke detector The proper function of a smoke detector of an enclosed space, such as a toilet or freight space or crew quarters in an aircraft, is monitored by at least two air pressure sensors which are so positioned that these air pressure sensors can measure an air pressure dif... | 03/21/2006 |
| 7012685 | Clogged filter detector A clogged filter detection system has an optical transmitter (32) aligned to pass light through an air filter (14) of an HVAC air flow plenum, a receiver (34) including a sensor and positioned to receive the transmitted light (48) directl... | 03/14/2006 |
| 6993414 | Detection of clogged filter in an HVAC system Static pressures are measured in an HVAC system and utilized to predict the condition of a filter in the HVAC system. As the filter becomes clogged, the static pressure can be expected to increase. Changes in the static pressure are determined periodically, and util... | 01/31/2006 |
| 6977583 | Automatic reset of lubricating fluid life monitoring system The fluid life monitoring system of the present invention includes a pressure monitor coupled to an engine. The pressure monitor is configured to detect a change in the amount of time it takes the engine's lubricating fluid to reach a pre-determined fluid pressure a... | 12/20/2005 |
| 6976052 | Spa control system An improved spa control system is disclosed. The invention describes a spa control system which calculates the time required to heat the water in the spa system to a desired temperature. From that information, the heating rate of the spa system can be determined, an... | 12/13/2005 |
| 6971186 | Lint filter assembly for use in a dryer A filter assembly for collecting lint in use with a dryer having an interior compartment. The filter assembly includes a control unit, an input air pathway in communication with the interior compartment, an exhaust, and a micro-filter. The input air pathway carries ... | 12/06/2005 |
| 6965815 | Spa control system An improved spa control system is disclosed. The invention describes a spa control system which calculates the time required to heat the water in the spa system to a desired temperature. From that information, the heating rate of the spa system can be determined, an... | 11/15/2005 |
| 6950029 | Airflow blockage detection apparatus for a permanent split-capacitor single-phase fan motor An airflow blockage detection apparatus for a permanent split-capacitor single-phase cooling fan motor measures and compares electrical currents in main and auxiliary windings of the motor to detect airflow blockage. Main and auxiliary current sensors detect AC curr... | 09/27/2005 |
| 6894620 | Method and device for monitoring the service life of a filter A method of monitoring the service life of a filter (1) in a filter system equipped with a fan, in particular a filter (1) in an air conditioning system of a motor vehicle, the instantaneous air speed (21) preferably being measured on each start... | 05/17/2005 |
| 6888466 | Air filter timer A novel air filter and timer for alerting persons responsible for changing or cleaning the air filter that it is time for servicing. An audible alarm is provided on the timer to emit a prolonged or intermittent audible alarm to indicate the need for servicing. The a... | 05/03/2005 |
| 6842117 | System and method for monitoring and indicating a condition of a filter element in a fluid delivery system A filter condition sensing circuit includes current and voltage sensors and a data processor. The current and voltage sensors produce signals indicating magnitudes of electrical current and voltage, respectively, provided to an electric motor used to move a fluid (a... | 01/11/2005 |
| 6819232 | Method of changing an air filter of vehicle air conditioning system A method of signaling for a change of an air filter of a vehicle air conditioning system is disclosed. The present invention uses a sensor installed in a conventional air conditioner and the appropriate time for changing the air filter is determined by checking comp... | 11/16/2004 |
| 6756904 | Device for purifying exhaust gas of engines The permeability of a DPF 21 mounted on a diesel engine 1 is evaluated by calculating the apparent passage area (A) based upon a difference in the pressure between the upstream and the downstream sides of the DPF 21 and upon other engine data, a... | 06/29/2004 |
| 6734801 | Switch frame electronic air filter alarming device An alarming apparatus and methods for use with an air filter are disclosed herein. A filament can be stretched across a portion or section of an air filter frame, wherein the portion or section comprises a first locus and a second locus located diagonally opposite t... | 05/11/2004 |
| 6703937 | Filtering apparatus for filtering compressed air A filter device for filtering compressed air having recognition means (24), which render possible recognition of the degree of contamination of the filter means (6) fitted. The recognition means (24) comprise a pressure differential sensor means (25) resp... | 03/09/2004 |
| 6582295 | Method of detecting clogging of an air filter and ventilation system employing such a method A method of measuring clogging of an air filter in a system for ventilation, air conditioning and/or heating of a passenger compartment of a motor vehicle, includes starting up an electric motor (11) driving a fan, measuring a characteristic value of the ... | 06/24/2003 |
