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| Number | Title | Issue Date |
| 6236321 | Clean out alert for water heaters An apparatus and method for determining and communicating a need for water heater clean out based on scale deposit buildup is disclosed in which a sensed increase in average reheat time is employed as a measure of deposit buildup and to initiate a clean o... | 05/22/2001 |
| 6121883 | Method and device for fluid pressure analytical electronic heat and fire detection A method for fluid pressure analytical electronic heat and fire detection, and a corresponding heat detector, used for detecting heat and fire, having no moving component, such as a valve, switch, membrane, diaphragm, or similar actuatable device of movin... | 09/19/2000 |
| 5748077 | Hydraulic leak detection system A system for detecting leaks in a hydraulic system. The system shuts down the hydraulic system if a leak is detected and notifies individuals in the area that a leak has occurred. The leak detection system has sensors for measuring hydraulic system parame... | 05/05/1998 |
| 5691702 | Pneumatic pressure detector for fire and ground fault detection Electrical circuitry associated with a pneumatic pressure detector for use in an overheat condition or fire alarm system for aircraft. The pressure detector comprises a plenum situated between a pair of deformable diaphragms and pressurized by a capillary... | 11/25/1997 |
| 5578997 | Fuel detector for a turbojet engine oil tank An apparatus for detecting fuel vapors in a turbojet engine oil tank is disclosed which incorporates a device in the oil tank which senses the presence of fuel vapors in the oil tank. The device has a housing defining an inner chamber in which a piston is... | 11/26/1996 |
| 5578993 | Temperature compensated annunciator A solid state temperature compensated annunciator is disclosed. The solid state temperature compensated annunciator includes a pressure sensor for measuring a pressure of the fillant within a vessel and a temperature sensor for measuring the temperature o... | 11/26/1996 |
| 5463377 | Apparatus for detecting the presence of a liquid An apparatus for detecting the presence of a liquid in a region, including an electrically passive sensor adapted for contacting the liquid, and an electrically active detector. The sensor is a circuit with a pair of spaced-apart terminals connected to a ... | 10/31/1995 |
| 5274353 | Anti-theft device Anti-theft device comprising a flexible and deformable elongated assembly (1) which is capable of forming a loop and is provided at one end with a male closure member (2, 64) and at the other end with a female closure member (3, 2) adapted to receive and ... | 12/28/1993 |
| 5136278 | Compact and lightweight pneumatic pressure detector for fire detection with integrity switch A pneumatic pressure detector for use in an overheat or fire alarm system utilizes a known capillary type sensor tube which has absorbed in it a gas. Overheat or fire condition causes the gas to expand which then actuates an associated deformable diaphrag... | 08/04/1992 |
| 4819250 | Apparatus for measuring temperature at a hot point along an electrical energy transmission cable Apparatus for measuring temperature at a hot point along an energy transmission cable (1) when the temperature exceeds a fixed limit temperature, the apparatus comprising a tube (3) containing a liquid which is vaporizable in the vicinity of said limit te... | 04/04/1989 |
| 4818975 | Generator stator core temperature monitor A temperature monitor for a generator stator core is disclosed. The monitor comprises a light source which generates a light beam, heat sensitive targets which receive the light beam and which either block the light beam or allow the light beam to pass th... | 04/04/1989 |
| 4812826 | Thermal sensor for detection of railroad bearing failures A thermal sensor composed of a standard bolt which has been modified to embody a temperature sensing element and placed into a bearing assembly of a train. This element contains a heat-sensitive wax that at a preset temperature expands causing the motion ... | 03/14/1989 |
| 4672920 | Pressure compensated temperature switch unit for protection of an internal combustion engine A pressure compensated temperature switch for the protection of an internal combustion engine or the like. The switch unit includes a housing, a portion of which is positioned within a passage in the cooling system of the internal combustion engine. Withi... | 06/16/1987 |
| 4518839 | High frequency heating apparatus with wireless temperature probe A novel high frequency heating apparatus for detecting the internal temperature of an object contained in a heating chamber and controlling the heating thereof is disclosed, in which the temperature change of the object is picked up as a change of the res... | 05/21/1985 |
| 4381439 | Self-controlled microwave oven A microwave oven is provided according to which food is cooked while a temperature sensor is inserted in the food and the heating of the food is interrupted in response to an output signal of the temperature sensor. The temperature sensor comprises a holl... | 04/26/1983 |
| 4075615 | Freezer alarm A bracket member of square U-shaped configuration having first and second spaced parallel arms and a head joining the arms and extending perpendicularly thereto rests on a wall of a freezer at the opening of the freezer with the first arm abutting the out... | 02/21/1978 |
| 4072933 | Fire heat detector and/or burglar alarm A detecting device for detecting heat due to the presence of fire for example. The detecting device includes an open-ended chamber closed by a resilient diaphragm. The diaphragm engages the open end to permit respectively the passage of air via an annular... | 02/07/1978 |
| 4028688 | Refrigeration unit air temperature detection alarm system A compact alarm system is provided by a temperature sensing switch within a refrigeration unit, the temperature of which actuates the switch when temperature rises to a predetermined level. Change of condition of the contacts induces a pulse which trigger... | 06/07/1977 |
| 4009055 | Apparatus for producing electricity in case of fire A method of and an apparatus for producing electricity when a fire breaks out, the apparatus comprising a normally sealed vessel of breakable material having an amount of activation electrolyte therein and a water-activated cell provided close to the vess... | 02/22/1977 |
| 3986560 | Fire protection means A fire protection apparatus, particularly for liquid fuel containers which are carried in aircraft or other vehicles, comprises a pressure transducer for producing an electrical output upon sensing a pressure change of predetermined magnitude in a liquid,... | 10/19/1976 |
| 3961328 | Detection system An alarm system comprising an elongate and flexible pressure line adapted to be charged with a selected line pressure; switching means coupled to the line and responsive to a pressure change in the line to create alarm signal; union means inserted in fric... | 06/01/1976 |
| 3938114 | Gas-powered alarm with pressure responsive remote indicator circuit The passage-way between a freon cylinder and a freon-powered horn is plugged by a eutectic metal plug. When sufficient heat loosens the plug, the horn is activated. A switch in the passageway senses the back pressure from the freon gas flow and activates ... | 02/10/1976 |
