Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7363811 | Measurement pickup A measurement pickup is provided offering a high measure of safety and having a measurement pickup housing, a sensor element arranged in the measurement pickup, at least one connection element closing the measurement pickup housing, and an excess-pressure protection... | 04/29/2008 |
| 7350414 | Mechanical barometer An analog pressure indicator assembly, particularly useful as a barometer, accurately indicates pressure or pressure changes using the fewest number of and/or least expensive components possible. The assembly is typically gearless, and includes a pressure sensitive ... | 04/01/2008 |
| 7347101 | Measuring strain in a structure using a sensor having an electromagnetic resonator The system (10) comprises a sensor (18) 90×90×90×30 mm as an electromagnetic microwave cavity (20) with a coupler (22) with a wire (40) and an antenna (42). Cavity (20) produces a response signal (26) in res... | 03/25/2008 |
| 7249517 | Pressure transmitter with power cycled hall effect sensor The invention disclosed herein is a pressure transducer utilizing a Hall effect sensor to detect the displacement of the transducer's diaphragm. The pressure transducer includes a power supply to draw current from a 4 mA to 20 mA current loop and deliver current to ... | 07/31/2007 |
| 7235984 | Probe device and probe method A probe device 20 having a contact load monitoring device 10. This contact load monitoring device measures the displacement of a loading table caused by a contact load exerted on the mounting table from a probe in an overdrive by means of a displacemen... | 06/26/2007 |
| 7197936 | Pressure sensor A ring-like groove 140 for accommodating a seal ring 130 is formed in fitting surfaces 12c and 13c of pressure introduction portions 12b and 13b for introducing a pressure from a measured member | 04/03/2007 |
| 7180285 | Electrodynamic position transducer with electronic memory means The transducer (1) comprises: a rigid casing (2–4) in which a membrane (5) is clamped which, together with a portion of the casing (2–4), defines at least one chamber (6, 7) of variable volume; at least one winding (14);... | 02/20/2007 |
| 7165458 | Vacuum gauge A thermal conductivity type pressure gauge comprises a gauge head (2) being rotatably mountable in a vessel whose environmental pressure is to be measured and an elongate electrical filament (6) mounted in the gauge head, the gauge head (2) havi... | 01/23/2007 |
| 7028467 | Exhaust emission control device for internal combustion engine An engine exhaust emission control device determines a differential pressure across a diesel particulate filter (DPF) to enable regeneration of the DPF at optimal timing. An ECU estimates the temperature of a differential pressure sensor provided for the DPF from th... | 04/18/2006 |
| 6967529 | Large dynamic range programmable gain attenuator A design of integrated circuit components to prevent accidental turn on when large input signals are accepted. With integrated circuits operated at lower power supply voltages, input signals having large peak values can tend to turn on devices within the integrated ... | 11/22/2005 |
| 6949354 | Methods for screening compounds active on neurons The present invention relates to compositions and methods for screening and/or identifying compounds exhibiting biological activity on neurons. The invention also relates to the isolation and culture of neurons, methods of inducing pathological conditions to said is... | 09/27/2005 |
| 6868720 | Testing of pressure sensor in surgical cassette A method of determining the accuracy of a pressure sensor in a surgical cassette is disclosed. The method involves displacing a diaphragm of the sensor a pre-defined amount of displacement, and measuring the force exerted on the diaphragm by the displacing step. The... | 03/22/2005 |
| 6412349 | Force balancing capacitance manometer An apparatus for measuring the differential pressure between at least two fluids including (a) first and second pressure enclosures; (b) first and second pressure deformable members where the first deformable member is sealingly connected to the first pre... | 07/02/2002 |
| 6407664 | System and method for monitoring vehicle Determination is made as to whether or not a self-diagnostic tester 13 is connected with a K line 14. When the result of the determination indicates that the self-diagnostic tester 13 is not connected with the K line 14, data indicating vehicle-operating ... | 06/18/2002 |
| 5902932 | Force balancing capacitance manometer An apparatus for measuring the differential pressure between at least two fluids including (a) first and second pressure enclosures; (b) first and second pressure deformable members where the first deformable member is sealingly connected to the first pre... | 05/11/1999 |
| 5515711 | Pressure measurement and calibration apparatus using gravity-induced diaphragm deflection A pressure measurement and calibration apparatus for accurately detecting fluid pressures in the range of between approximately 0 and 1000 millitorr, and more particularly in the range of between 0 and 10 millitorr, and a method for calibrating an externa... | 05/14/1996 |
| 5343753 | Device for detecting a variation in a pressure being monitored by sensing displacement of a ball in a tube A detector tube is supplied with air at an adjustable pressure balanced by at least two adjustable leak flow rates in the conduits 4 and 7 in order to adjust the position of ball in the tube. The possible manual inclination of tube between an extreme vert... | 09/06/1994 |
| 5317948 | Pressure transducer using permanent magnet and opposing variable magnetic field An electromagnetic fluid pressure transducer is provided which uses the opposing magnetic fields of a permanent magnet and an electromagnet to sense a change in a differential force. The differential force is the result of a pressure applied to the unequa... | 06/07/1994 |
| 5103682 | Ultra-sensitive force detector employing servo-stabilized tunneling junction A highly sensitive force detector using a tunneling junction as a strain gauge is disclosed. The tunneling junction is connected to a deflection member which receives the force to be measured. The junction is connected in a nulling circuit to a magnetic f... | 04/14/1992 |
| 5005408 | Gas weights compensation method for liquid depth gauging system A method and apparatus for monitoring liquid levels using pressure responsive instruments is described, in which an arrangement for compensating for the effects of errors including gas weights errors is provided. The required compensation factor for a par... | 04/09/1991 |
| 4856338 | Technique for null balancing fluidic circuits A null balanced fluidic sensing system that is less susceptible to pressure upply disturbances includes sensing and amplifying elements in a closed loop arrangement. The differential output of the sensor, developed as a result of an input stimulus, is fed ... | 08/15/1989 |
| 4739664 | Absolute fluid pressure sensor A pressure sensor uses two fluidically coupled piezoelectrically driven, vibrating cantilever structures, each tuned to the same fundamental resonance frequency. One cantilever, the driver, is electrically driven at resonance and at constant vibrational a... | 04/26/1988 |
| 4724709 | Pressure measuring system with internal reference A pressure measuring system which includes a pressure sensitive capacitor and a reference capacitor, a source of external excitation connected to the sensing capacitor, the reference capacitor being connected to a feedback signal generating circuit and th... | 02/16/1988 |
| 4682499 | Pressure transmitter An improved pressure transmitter having a body with signal pressure responsive means and output pressure means having pressure responsive means, a supply of fluid pressure to said output pressure means, and adjusting means interposed between said signal p... | 07/28/1987 |
| 4669317 | Devices for the very accurate measurement of fluid pressures A device is provided for the very accurate measurement of fluid pressures, comprising a vertical cylinder (2), a piston (1) adapted for sliding in this cylinder with viscous friction, the pressure to be measured being applied to the upper face (23) of the... | 06/02/1987 |
| 4665747 | Flight instrument using light interference for pressure sensing Aircraft instrument for indicating air pressure, air pressure rate of change and accelerations of the aircraft movement based on the use of an optical laser interferometer. The air pressure is connected to one of several mirrors in the interferometer whic... | 05/19/1987 |
| 4662213 | Back pressured pneumatic pressure cell An improved back-pressured pneumatic pressure cell is provided along with a method of using the same. The device includes at least one sensing cell mounted on a blade for insertion into the soil. The cell includes a perforated outer ring and a perforated ... | 05/05/1987 |
| 4614118 | Non-compliant pressure cell The present invention is a pressure sensing and measurement device that eliminates errors due to compliance and lack of sensitivity. The cell uses a pressure receiving means (such as a flexible diaphragm) to detect an impinging object, a means to countera... | 09/30/1986 |
| 4604898 | Pressure measuring device A device is provided comprising a circuit using the properties of a resonating cavity sensor whose resonance frequency is modified by the electric capacity variations due to the mechanical deformation of a wall under the effect of the pressure to be measu... | 08/12/1986 |
| 4586388 | Three force balanced mechanism In a three force balanced mechanism comprising a floating pivot, an input force transmitting member, a feedback force transmitting member, one end of the input force transmitting member and one end of the feedback force transmitting member pivot in differ... | 05/06/1986 |
| 4570490 | Differential pressure ratio measurement system A pressure ratio measuring system is disclosed. The system includes two quartz capacitive pressure transducers (16, 22). Each capsule contains a pressure sensitive capacitor (Csa, Csf) which is fed by an alternating excitation signal. Capacitance (Csa) is... | 02/18/1986 |
| 4546651 | Transducer coupling A circuit for coupling a transducer having a reactive sensing element to equipment providing either AC or DC drive voltage and equipped with strain gauge amplifiers in which the sensing impedance varies the gain of the feedback loop of an oscillator, an A... | 10/15/1985 |
| 4546785 | Pressure translator and system for measuring pressure A pressure translator for converting a process pressure into a pneumatic signal which can be transmitted and measured by a pressure measurement device at a remote location. The pressure translator provides isolation for the process and the measuring equip... | 10/15/1985 |
| 4532809 | Pressure measuring systems with increased accuracy for a constant resolution A pressure parameter measurement system includes a parameter measurement loop (24, 16, 26, 28, 30, 32, 34) generating a digital signal (N1) indicative of a parameter (Pa-Pb) being measured, a common mode measurement loop (24, 22, 36, 38, 40, 42, Cfa) gene... | 08/06/1985 |
| 4517842 | Fluid pressure transducer A fluid pressure transducer of the null balance type in which a fluid whose pressure is being sensed acts against one face of a diaphragm and a balancing control fluid acts against the opposite face. Control fluid pressure is uniformly distributed against... | 05/21/1985 |
| 4502333 | Three force balanced mechanism In a three force balanced mechanism of the type comprising a floating pivot, an input force transmitting member, a feedback force transmitting member, one end of these members being connected to the floating pivot and a flexible span setting member with o... | 03/05/1985 |
| 4489613 | Transmitting device for measuring the operating pressure in a system A device for sensing and monitoring the pressure variations of a pressurized fluid in a duct (13), comprises an upper body (1) coupled to a pressurized air source (5) and a lower body (2) which is coupled by means of a resilient ring, to a sleeve (12) wel... | 12/25/1984 |
| 4457179 | Differential pressure measuring system A differential pressure measuring system is disclosed. The system includes two quartz capacitive pressure transducers (14, 16). Each capsule contains a pressure sensitive capacitor (Csa, Csb) and a relatively pressure invariable reference capacitor (Cra, ... | 07/03/1984 |
| 4434664 | Pressure ratio measurement system A pressure ratio measuring system is disclosed. The system includes two quartz capacitive pressure transducers (16, 22). Each capsule contains a pressure sensitive capacitor (Csa, Csf) which is fed by an alternating excitation signal. Capacitance (Csa) is... | 03/06/1984 |
| 4431985 | Stepper motor system for digitally measuring input quantities A digital system for measuring an input quantity includes an input mechanism for providing a first input in response to an input quantity to be measured, a stepper motor for providing a second input, a measuring apparatus connected to the input mechanism ... | 02/14/1984 |
