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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 4274125 | Temperature compensated capacitance pressure transducer A pressure transducer is comprised of a crystalline quartz deflection plate which is clamped to a clamping plate having a rectangular hole therein so that deflection of the crystalline quartz plate in response to pressure difference thereacross is into th... | 06/16/1981 |
| 4272822 | Apparatus for converting a mechanical displacement to an electrical signal Apparatus for converting a mechanical displacement to an electrical signal having a capacitor type displacement detector for detecting a mechanical displacement in terms of capacitances C1 and C2 of two capacitors and means for producing a signal correspo... | 06/09/1981 |
| 4265252 | Intracranial pressure implant An implantable transensor device containing a passive RF resonant circuit having a natural frequency influenced by the pressure of the sensor's environment in a body cavity of a living entity. The circuit of the transensor includes an inductor and a capac... | 05/05/1981 |
| 4262540 | Pressure measuring device A pressure sensor the output of which is substantially immune from errors caused by temperature variation or exteriorly applied forces. An insulating disc with metal foil electrodes on the flat surfaces thereof is disposed in an inner cylinder housing bet... | 04/21/1981 |
| 4257274 | Capacitive pressure sensor A capacitive pressure sensor is provided which has a conductive silicon diaphragm having a thick supporting portion at the periphery thereof and a thin inner deflecting portion which is reduced in thickness from the supporting portion by means of an etchi... | 03/24/1981 |
| 4244228 | Pressure transducer A pressure transducer, having a measuring element contained in a housing, is acted upon by the pressure to be measured and, due to its elastic properties, also acts as the measuring spring. A measuring transducer presenting no problems as to overload prot... | 01/13/1981 |
| 4229776 | Capacitive capsule for aneroid pressure gauge A capsule for use in aneroid pressure gauges comprising a pair of membranes sealed to each other along peripherally extending side edge regions to define a sealed, interior space therebetween. One of the membranes is formed having a centrally located char... | 10/21/1980 |
| 4227418 | Capacitive pressure transducer A capacitive pressure transducer constituted by a pressure sensor whose capacitance is caused to vary as a function of an applied pressure and a coupling assembly adapted to hydraulically convey the variable pressure of the fluid to be metered to the pres... | 10/14/1980 |
| 4206761 | Pressure-balanced telemetric pressure sensing method A differential pressure sensing device is fully implanted in the body of a patient to monitor internal pressure such as intracranial pressure. A movable element in the sensor communicates on one side with the internal pressure to be measured and on the ot... | 06/10/1980 |
| 4206762 | Telemetric differential pressure sensing method A differential pressure sensing device is fully implanted in the body of a patient to monitor internal pressure such as intracranial pressure. A movable element in the sensor communicates with the internal pressure of the body to be measured on one side a... | 06/10/1980 |
| 4196632 | Dual capacitance type bonded pressure transducer The apparatus includes first and second support elements of fused quartz and an intermediately positioned thin diaphragm of the same material. Each support element has a recess in one surface which defines a support surface. The support elements are orien... | 04/08/1980 |
| 4184189 | Capacitive pressure sensor and method of making it An inexpensive glass capacitive pressure sensor. Conductive capacitor electrodes are disposed on two flat glass plates, one serving as a diaphragm, the other as a substrate. The electrodes are positioned in a spaced apart, substantially parallel relations... | 01/15/1980 |
| 4178621 | Electromechanical pressure transducer An improved ceramic capacitive pressure sensor adaptable for use in automobiles is disclosed. The pressure sensor comprises a thin flexible diaphragm disc having a capacitor electrode deposited on it. A thick cylindrical base substrate has a top surface w... | 12/11/1979 |
| 4177680 | Dual pressure sensor A variable capacitance dual pressure sensor for sensing the pressure levels of a pair of fluids independently comprises an enclosure having a top wall and a bottom wall, and a substrate of dielectric material having a first major surface facing the top wa... | 12/11/1979 |
| 4169389 | Pressure measuring device A flexible diaphragm-type fluid-filled sensing device is made immune to thermal expansion and contraction errors by providing a constant volume first fluid chamber formed between the insulating block and a metal plate, a second chamber between the metal p... | 10/02/1979 |
| 4158311 | Pressure sensing device A compact sensing device is provided which the tension applied to the sensing member is substantially uniform and free of thermally changing. Either the sensing member itself or a clamping member disposed around the device or both, are made of a precipita... | 06/19/1979 |
| 4158217 | Capacitive pressure transducer with improved electrode An electrode for use in capacitive pressure transducers of the type including either a single diaphragm electrode and a conductive reference plate separated by a gap or two diaphragm electrodes separated by a gap. The electrode comprises a conductive area... | 06/12/1979 |
| 4154115 | Method and device for continuous measuring of gas pressures A method and a device for the continuous measurement of gas pressures are provided. The gas pressure to be measured is modulated in a small partial volume and the pressure fluctuations thus produced are converted into electrical signals which are proporti... | 05/15/1979 |
| 4127110 | Implantable pressure transducer A wireless, surgically implantable pressure transducer for measuring pressure of fluid or tissue in a body chamber such as a brain ventricle of a patient suffering hydrocephalus or a head injury. The transducer includes an inductor and a capacitor connect... | 11/28/1978 |
| 4120206 | Differential pressure sensor capsule with low acceleration sensitivity A capacitance type differential pressure sensor which includes isolation diaphragms and incompressible fluid filling so that the sensing element does not have to be exposed to hostile fluids for pressure sensing and which isolation diaphragms are arranged... | 10/17/1978 |
| 4103555 | Pressure sensor for high-temperature liquids A pressure sensor for use in measuring pressures in liquid at high temperatures, especially such as liquid sodium or liquid potassium, comprises a soft diaphragm in contact with the liquid. The soft diaphragm is coupled mechanically to a stiff diaphragm. ... | 08/01/1978 |
| 4096758 | Pressure to electric transducer A pressure to electric transducer is described employing an electrical capacitance formed by two parallel metal plates separated by a variable air gap, one of the plates being fixedly mounted and the other being movable to change the spacing in direct pro... | 06/27/1978 |
| 4091683 | Single channel electrical comparative measuring system A measuring system based on using a ratio of variable capacitance measurements derived from alternate sampling and referencing of at least two capacitance devices and use of a single channel for the capacitance outputs so that the measurements are basical... | 05/30/1978 |
| 4089036 | Capacitive load cell A capacitive type load cell utilizing a support, a diaphragm member mounted with respect to said support for movement relative thereto, said diaphragm having a conductive surface, and a capacitor plate attached to the diaphragm so that upon deflection of ... | 05/09/1978 |
| 4084439 | Pressure transducer with capacitor pick-up means A pressure transducer includes an electromagnetic drive coil which vibrates a thin walled cylinder at a natural vibrational mode. A capacitor unit senses the vibrational frequency of the cylinder and gives an output signal corresponding to the pressure di... | 04/18/1978 |
| 4073191 | Differential pressure transducer A differential-pressure transducer of the type comprising a measuring diaphragm supported at its peripheral edges and its sides presented to respective internal chambers filled with a pressure-transmitting liquid, the chambers and the diaphragm being cont... | 02/14/1978 |
| 4072057 | Differential pressure cell with diaphragm tension and overpressure protection A differential pressure measuring cell includes a capacitive-type measuring chamber having a relatively rigid diaphragm, an auxiliary chamber having a relatively flexible diaphragm, a casing defining first and second recesses surrounding the auxiliary and... | 02/07/1978 |
| 4040118 | Pressure sensitive transducer The following specification is directed to a pressure responsive transducer utilizing dual diaphragms on opposite sides of a sandwich of substrates formed of ceramic and having an intermediate substrate in which a slot is formed to communicate with the di... | 08/02/1977 |
| 3965746 | Pressure transducer A high precision pressure transducer utilizing a fluid-tight evacuated pressure capsule having a diaphragm forming the wall portion of the pressure capsule. Deflection of the diaphragm controls variations in an extremely small gap spacing between two asso... | 06/29/1976 |
