Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 6832507 | System for detecting the presence of moisture The system comprises at least one electronic sensor for detecting the presence of moisture. The system further comprises at least one reading device for obtaining information from the sensor about the presence of moisture. The sensor comprises a resonant circuit whi... | 12/21/2004 |
| 6308564 | Method and apparatus for determining the quantity and quality of a fluid A method and an apparatus are proposed for determining and/or monitoring the quantity and quality of a fluid in which a lowering of the boiling temperature is symptomatic of a deterioration in quality. For this, the filling level and the condition of the ... | 10/30/2001 |
| 5747997 | Spin-valve magnetoresistance sensor having minimal hysteresis problems The present invention provides a method and apparatus for utilizing spin valve magnetoresistance devices for the measurement of weak magnetic fields. The magnetoresistive element consists of a pinned ferromagnetic layer and a soft ferromagnetic layer sepa... | 05/05/1998 |
| 5661405 | Elongate sensor having polymeric electrodes filled with conductive particles and having braided sleeves An elongate, flexible sensor for sensing an electrically conductive liquid, such as water, has two flexible electrodes extending along the sensor and two flexible sleeves extending therealong and being attached adhesively to each other along the sensor. E... | 08/26/1997 |
| 5602325 | Exhaust sensor having flat plate ceramic sensing element and a sealing package The invention includes a flat plate exhaust gas sensor having a plurality of layers of glass and steatite immediately surrounding a flat plate sensing element. A ceramic body surrounds each layer of solid-state, sintered glass and steatite and extends fro... | 02/11/1997 |
| 5278636 | Non-volatile, solid state bistable electrical switch A bistable switching element is made of a material whose electrical resistance reversibly decreases in response to intercalation by positive ions. Flow of positive ions between the bistable switching element and a positive ion source is controlled by mean... | 01/11/1994 |
| 5148708 | Liquid level sensor which prevents liquid absorption A liquid level sensor for detecting a level of an electrolyte where: a pair of resistance films are formed on an insulating substrate: a plurality of electrodes are intermittently mounted on the resistance films in the longitudinal direction; the resistan... | 09/22/1992 |
| 5142909 | Material level indicator A system for indicating level of material in a vessel comprising a probe which includes a plurality of electrically discrete probe elements of electrically conductive construction position within a material vessel in a spaced array extending height-wise o... | 09/01/1992 |
| 5001928 | Liquid level detecting apparatus A level detecting resistor (Rd) is inserted into a liquid (5) and has a length immersed in the liquid. The level detecting resistor (Rd) is supplied a constant current (Id) from a constant current source (1). The voltage drop (Vd) developed across the lev... | 03/26/1991 |
| 4945257 | Electrically settable resistance device A device provides an electrically settable resistance and comprises first and second electrodes. Each electrode comprises a redox active material. The device further comprises means defining an environment for each electrode such that the average redox st... | 07/31/1990 |
| 4567762 | Thermoelectric level detector and a method for its manufacture A thermoelectric level detector employs an impedance element, at least a portion of which is meandering in configuration in which the resistive path repeatedly traverses the axis thereof, to detect the level of liquid in a tank. The impedance of the eleme... | 02/04/1986 |
| 4510483 | Liquid rheostat for starting an electric motor with improved sill structure A variable level liquid rheostat having a tubular overflow member between a starting chamber and a tank for controlling the level of electrolyte in the starting chamber. The overflow member has a closed upper end inside the starting chamber and lateral di... | 04/09/1985 |
| 4413528 | Miniature pressure transducer In an exemplary embodiment, an electrical signal is to be generated corresponding to the pressure to be measured. The pressure transducer is formed by an outer tube in which a measuring cell as well as a liquid line connected to a liquid reservoir are dis... | 11/08/1983 |
| 4390860 | Electronically variable resistance device A variable resistance device having a moveable globule of liquid metal, contained in a channel, and having contact on one side with a resistive surface and on another side with a conductive surface, the resistive surface and conductive surface isolated fr... | 06/28/1983 |
| 4308870 | Vital signs monitor A vital signs monitor comprising, a plurality of pads having a front surface for contacting the chest of a patient, and containing equipment for monitoring a body function of the patient. The monitor has a device connected between a pair of pads for detec... | 01/05/1982 |
| 4297890 | Pressure transducer In an exemplary embodiment, a measuring cell is formed by an interior tube open at one end and within a surrounding exterior tube. The interior tube is adapted to contain a gas while a chamber within the exterior tube at the open end of the interior tube ... | 11/03/1981 |
| 4261208 | Pressure transducer In an exemplary embodiment, the liquid pressure to be measured is in a liquid container with an inner tube forming a measuring cell arranged in an outer tube, which measuring cell can be filled in part with a liquid and in the remainder with a gas. A cond... | 04/14/1981 |
| 4172387 | Pressure responsive apparatus A liquid filled differential pressure transmitter includes a metallic measurement diaphragm within a pressure chamber and a pair of isolation diaphragms sealing the chamber from the process fluid which serve to transmit the applied pressure signals to the... | 10/30/1979 |
| 4151503 | Temperature compensated resistive exhaust gas sensor construction A pair of ceramic chips, formed of similar metal oxide ceramic materials which are semiconductors at elevated temperature, are connected electrically in series and are arranged for exposure to the hot gaseous combustion by-products produced by an internal... | 04/24/1979 |
| 4082997 | Oil detecting device The present invention provides an oil detecting element capable of accurately detecting oil floating on water. The oil detecting element comprises a water-repellent, oil-passing filtering member for preventing water coming into the element. Oil can be det... | 04/04/1978 |
| 3990310 | Closed pressure rebalance system for measuring the rate of fluid flow A closed system couples the inlet and outlet pressures generated by a centrifugal pump to a pair of flexible diaphragms which seal the flow tube in a pressure rebalance system for measuring fluid flow. The system is filled with a conducting fluid which fo... | 11/09/1976 |
