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| Number | Title | Issue Date |
| 8161800 | Methods and systems for valve leak simulation A method for simulating a compressor valve leak is described. The method includes inducing a flow of gas past a compressor valve that is coupled to a bypass block, wherein the bypass block defines a first passageway and a second passageway therein, and wherein the b... | 04/24/2012 |
| 8127596 | Method for verifying the tightness of a tank bleeding system without using a pressure sensor In a method for verifying the tightness of a tank bleeding system with a tank bleeding valve, a stop valve for air-tightly closing the tank bleeding system relative to an atmosphere prevailing outside the motor vehicle, and a bistable pressure switch whose switched ... | 03/06/2012 |
| 8109131 | Meter register transmitting flow rate warning A method and apparatus for measuring a fluid and determining a leak comprising the steps of providing a meter and a meter register coacting with the meter. When a leak is detected, a signal is transmitted from the meter register regarding fluid consumption. The tran... | 02/07/2012 |
| 8104327 | Leak detection method for a primary containment system A leak detection method for determining changes in helium concentration over time in an interstitial space between a primary vessel and a secondary vessel. The primary vessel is disposed inside a secondary vessel and charged with helium. An expected concentration of... | 01/31/2012 |
| 8096167 | Acoustic leak detector with noise cancellation The present invention provides a leakage detector enabling accurate and stable detection for occurrence and a position of leakage in a buried fluid pipe line and also making it possible for even those not so skilled in the leakage detection work to use the detector.... | 01/17/2012 |
| 8020430 | Passive leak detection devices and systems for detecting gas leaks A passive leak detection device may include a pressure switch, a check valve and a balance valve. The pressure switch may include an electric input lead, an electric output lead, a balance chamber and an inlet chamber. A pressure differential between the balance cha... | 09/20/2011 |
| 7987698 | Gas leak detection apparatus and method According to the present invention, mistaken detection of a gas leak can be prevented even when using an appliance which has been newly installed in a dwelling receiving a gas supply, and whereby a gas leak can be detected rapidly, efficiently and accurately. The ch... | 08/02/2011 |
| 7987699 | Pneumatic assembly for a pressure decay tester A pneumatic assembly for a pressure decay tester of printhead integrated circuits includes a pressurized air supply. A pneumatic clamping arrangement is in fluid communication with the pressurized air supply for clamping a carrier for the printhead integrated circui... | 08/02/2011 |
| 7975529 | Method of discovering leakage in a heat exchanger A method of discovering leakage in a heat exchanger, wherein the method is carried into effect on an intact heat exchanger which, together with surrounding conduits, is filled with water. The heat exchanger preferably has requisite pressure indicators mounted betwee... | 07/12/2011 |
| 7942035 | Anode leak test implementation A system and method is provided for detecting an anode leak of an anode stream in a fuel cell stack. The system comprises a controller that stores at least one first predetermined control value that corresponds to a first pre-selected pressure level. The controller ... | 05/17/2011 |
| 7921694 | Leak detector and detection method using radiation transmitted through a fluid line A leak detector for detecting a leak in a line includes a transmitting device for generating radiation to be coupled into the line. By a receiving device, radiation that has emerged from the line through a leak is received, as a result of which the leak becomes dete... | 04/12/2011 |
| 7882728 | Dual anomaly judgment device for a fuel cell There is provided an anomaly judgment device that is capable of detecting an abnormal state of a system highly accurately and obtaining an accurate result. The anomaly judgment device may include a plurality of anomaly judgment devices for judging an anomaly of the ... | 02/08/2011 |
| 7856864 | Deriving information about leaks in pipes A method and system for deriving fluid leak information are described. A plurality of sealing elements are introduced into the pipeline at a location upstream of the leak, and at least some of the sealing elements are drawn towards the leak to cause a sealing event ... | 12/28/2010 |
| 7752890 | Method and apparatus for continuous fluid leak monitoring and detection in analytical instruments and instrument systems A method and device are disclosed that provide for detection of fluid leaks in analytical instruments and instrument systems. The leak detection device includes a collection tube, a fluid absorbing material, and a circuit that electrically couples to an indicator de... | 07/13/2010 |
| 7739899 | Leak detection using structure-borne noise A method for detection and location of air leaks in a pressure vessel, such as a spacecraft, includes sensing structure-borne ultrasound waveforms associated with turbulence caused by a leak from a plurality of sensors and cross correlating the waveforms to determin... | 06/22/2010 |
| 7716966 | Mesh leak detection system for a medical device The present invention provides a surgical device including an elongate body defining a fluid flow path therethrough. An expandable element may be coupled to the elongate body and placed in fluid communication with the fluid flow path. Moreover, the surgical device m... | 05/18/2010 |
| 7614281 | Method and system for detecting a leakage in a pipeline or similar conduit The invention concerns a method and a system for detecting a leakage in a pipeline (4) or similar conduit characterized by the use of an umbilical flexible tube (1) laid within and along said pipeline (4), the displacement of a solution column (... | 11/10/2009 |
| 7581431 | Gas leak detection device and method for same A gas leak detection device for a fuel cell system equipped with a main valve (SV1) in a fuel gas supply source (11), comprising a shutdown valve (SV2) provided in a fuel gas supply channel downstream of the main valve (SV1), pressure mon... | 09/01/2009 |
| 7574896 | Leak detection and control Fluid leaks can be detected and controlled in a pressurized piping system. Apparatus for this includes control logic; in communication with the logic, a flow detector and/or a pressure detector, and a control valve. One or more of the following is or are provided al... | 08/18/2009 |
| 7555935 | End-of-line zone integrity detection for a piping network in a secondary containment monitoring and leak detection system An end-of-zone or line sensor placed at the end of a secondarily contained fuel piping(s) or network(s). The interstitial space of the piping network is coupled to a vacuum-generating source that draws a vacuum level in the interstitial space to monitor for leaks or... | 07/07/2009 |
| 7552622 | System for monitoring the health of electrical generators and method thereof A method and apparatus is provided for a system for maintaining hydrogen purity in an electrical power generator where the system monitors the health of the electrical generating system by calculating the time remaining until preventative maintenance is required bas... | 06/30/2009 |
| 7461541 | Leak detection method for a primary containment system In one aspect the method provides for determining changes in helium concentration over time in the interstitial space between a primary vessel that is charged with helium and a secondary vessel. The expected concentration resulting from permeation is calculated and ... | 12/09/2008 |
| 7441441 | Automatic leak detection and isolation system for a pipeline An automatic leak detection and isolation system for a fluid pipeline (3) comprising a pipeline section (1) through which the fluid flows, the pile line section comprising an inner section (5) through which the fluid flows and a sleeve (9... | 10/28/2008 |
| 7395695 | Apparatus for testing lengths of pipe A pipe testing apparatus includes a mandrel adapted for insertion within the pipe and two sealing devices connected to the mandrel and adapted to seal opposite ends of the pipe to create an annular space between the mandrel, the pipe, and the sealing devices. The ap... | 07/08/2008 |
| 7251983 | Secondary containment system and method A pump housing that contains a pump that draws fuel from an underground storage tank containing fuel to deliver to fuel dispensers in a service station environment. The pump is coupled to a double-walled fuel pipe that carries the fuel from the pump to the fuel disp... | 08/07/2007 |
| 7231812 | Conduit breach location detector A conduit breach location detector for detecting leaks in a conduit is disclosed. The conduit breach location detector includes a shuttle cage for connection to the conduit. A sounding shuttle is provided in the shuttle cage. A sounding cable may be connected to the... | 06/19/2007 |
| 7225664 | Secondary containment leak prevention and detection system and method A pump housing that contains a pump that draws fuel from an underground storage tank containing fuel to deliver to fuel dispensers in a service station environment. The pump is coupled to a double-walled fuel pipe that carries the fuel from the pump to the fuel disp... | 06/05/2007 |
| 7194893 | Temperature correction method and subsystem for automotive evaporative leak detection systems A method and sensor or sensor subsystem permit improved evaporative leak detection in an automotive fuel system. The sensor or sensor subsystem computes temperature-compensated pressure values, thereby eliminating or reducing false positive or other adverse results ... | 03/27/2007 |
| 7194894 | Advanced HIT skid data collection An Advanced Data Logging kit for testing a generator's liquid cooled stator bar system for leaks is disclosed. The kit is installed in between the generator's header and the HIT Skid and in the generator's cooling system. The kit includes pressure and vacuum transdu... | 03/27/2007 |
| 7185529 | Shower station testing assembly for pressure testing plumbing The present invention provides a testing assembly for pressure testing a plumbing system in a building where the building has a shower station with a drain and a shower inlet. The testing assembly includes a drain adapter, a hose fitting on the shower inlet, and a h... | 03/06/2007 |
| 7174771 | Leak detection system A leak detection system capable of automatically detecting a leak in a pressurized piping system. A pressure decay test is utilized to test for leaks in the piping system. Disruption to users of the piping system is reduced by only performing the pressure decay test... | 02/13/2007 |
| 7127937 | Method for leak detection in gas feeding systems with redundant valves A method for detecting leaks in a fuel cell system that includes a hydrogen storage tank, a primary shut-off valve and a secondary shut-off valve in a supply line. At shut-down, the primary shut-off valve is closed and the stack is temporarily left operating. The pr... | 10/31/2006 |
| 7080546 | Secondary containment leak prevention and detection system and method A pump housing that contains a pump that draws fuel from an underground storage tank containing fuel to deliver to fuel dispensers in a service station environment. The pump is coupled to a double-walled fuel pipe that carries the fuel from the pump to the fuel disp... | 07/25/2006 |
| 7066010 | Hydrostatic test system and method A system and method of hydrostatic testing a pipeline that is not in service, according to which the pipeline is hydrostatically pressurized and a portable remote telemetry unit is temporarily connected to the pipeline for measuring variables corresponding to the hy... | 06/27/2006 |
| 7051576 | Secondary containment leak prevention and detection system and method A pump housing that contains a pump that draws fuel from an underground storage tank containing fuel to deliver to fuel dispensers in a service station environment. The pump is coupled to a double-walled fuel pipe that carries the fuel from the pump to the fuel disp... | 05/30/2006 |
| 7024919 | Pressure measuring method and device The invention provides a pressure measuring method and device that are capable of easily measuring the volume of a pipe that is an object of inspection and of eliminating the influences of a change in temperature in the pipe. A pressure measuring method using... | 04/11/2006 |
| 7010961 | Power head secondary containment leak prevention and detection system and method A submersible turbine pump includes a power head enclosed in a casing. A vacuum source associated with the submersible turbine pump draws a vacuum in the interior space of the casing. A pressure sensor may be used to monitor the vacuum in the interior space to detec... | 03/14/2006 |
| 6997042 | Secondary containment leak prevention and detection system and method A pump housing contains a pump that draws fuel from an underground storage tank to deliver fuel to fuel dispensers in a service station environment. The pump is coupled to a double-walled riser pipe that carries the fuel from the underground storage tank to the pump... | 02/14/2006 |
| 6978660 | Power head secondary containment leak prevention and detection system and method A submersible turbine pump includes a power head enclosed in a casing. A vacuum source associated with the submersible turbine pump draws a vacuum in the interior space of the casing. A pressure sensor may be used to monitor the vacuum in the interior space to detec... | 12/27/2005 |
| 6935161 | Service station leak detection and recovery system A fueling environment distributes fuel from a fuel supply to fuel dispensers in a daisy chain arrangement with a double-walled piping system. Fuel leaks that occur within the double-walled piping system are returned to the underground storage tank or a sump proximat... | 08/30/2005 |
