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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 |
| 6967561 | Current control device A current control device is described wherein a pressure conduction composite is compressed and decompressed to alter its conductivity and thereby current conduction through the device. The pressure conduction composite is composed of a nonconductive matrix, a condu... | 11/22/2005 |
| 6943660 | Current control device A current control device is described wherein a pressure conduction composite is compressed and decompressed to alter its conductivity and thereby current conduction through the device. The pressure conduction composite is composed of a nonconductive matrix, a condu... | 09/13/2005 |
| 5045830 | Hydraulic actuating apparatus A hydraulic actuating apparatus includes a cylindrical case having a fitting at one end connectable to a source of pressurized oil, the fitting having a passage for communication with the pressurized oil, a slider slidably carried by the cylindrical case,... | 09/03/1991 |
| 4800758 | Pressure transducer with stress isolation for hard mounting A pressure transducer has a stress isolator layer which permits the sensor to be non-resiliently mounted (hard mounted) to a mounting surface that in turn is subjected to strain. The strain of the mounting surface tends to induce undesired stress in the s... | 01/31/1989 |
| 4682502 | Pressure sensor A pressure sensor comprising an air-tight container, enclosing water vapor therein, which elastically deforms depending upon a variation in the external pressure to result in a variation in the content volume thereof, a moisture sensor disposed within the... | 07/28/1987 |
| 4638148 | Control system and control device for controlling a heating unit and method of making the same A control system and control device for controlling a heating unit and method of making the control device are provided, the control device having a rod and tube temperature sensing unit for providing linear motion of a part thereof along a substantially ... | 01/20/1987 |
| 4487074 | Pressure sensor with a hall element circuit A deformable pressure chamber (10) moves a permanent magnet (12) carried by it as it is deformed. A GaAs Hall element (13) is disposed on a substrate plate (1) opposite the permanent magnet, and the substrate plate also carries a hybrid circuit including ... | 12/11/1984 |
| 4254395 | Electromechanical force converter for measuring gas pressure A Hall-effect sensor unit producing an electrical output is located between two permanent magnets of opposed polarity. The magnetic induction detected by the sensor unit is caused to vary with the pressure by variation of the spacing between the sensor un... | 03/03/1981 |
| 4156226 | Transducer assembly Pressure responsive transducer of the potentiometer type having a resistance corresponding to the applied pressure. The transducer is particularly suited for aircraft use and includes a rigid frame fabricated of sheet metal. A pivotably mounted wiper asse... | 05/22/1979 |
| 4064476 | Air pressure transducer A transducer wherein a brush arm is supported for pivotal movement of its distal end along a bank of terminals in a circuit where there is a common terminal and a bank of terminals by expansion and contraction of a bellows. Brushes at the proximal and dis... | 12/20/1977 |
| 4023000 | Direct drive sliding contact transducer The invention pertains to a pressure sensing transducer employing an evacuated bellows wherein sliding electric contacts are mounted upon the bellows' movable portion. The sliding contacts traverse over a printed circuit board having conducting portions d... | 05/10/1977 |
| 3960019 | Cannister arrangement of transducers to monitor pressures For monitoring a plurality of pressurized cables and supplying electrical signals in accordance therewith, there is provided a cannister arrangement of transducers. The cannister is provided with a closure by which the cannister is pivotally mounted. The ... | 06/01/1976 |
