Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 7200223 | Electronic circuit to reduce noise in digital subscriber loop and communications over unshielded twisted pair metallic conductors In order to reduce noise in telecommunications made over unshielded twisted pair (UTP) of metallic conductors an active electronic circuit for a two-to-four wire hybrid circuit reduces common mode signals without recourse to inductive components. The hybrid has a ba... | 04/03/2007 |
| 7080309 | Multiple ECC schemes to improve bandwidth A method and an apparatus are used to maximize available transmission bandwidth by using multiple error correcting code (ECC) schemes. A transaction between components in a computer system may involve the transmission of header information in a header packet. One or... | 07/18/2006 |
| 6469519 | Precision loop voltage detector for subscriber line interface circuit applications A precision loop voltage measurement circuit outputs a voltage proportional to the differential voltage across a telephone wireline pair. This voltage is coupled to a tip-ring sense rectifier circuit having complementary transistor pairs coupled through a... | 10/22/2002 |
| 6469520 | Testing electrical circuits A fully differential analogue circuit is tested by monitoring the currents in two branches when a common mode signal is applied and indicating correct operation if the two currents are correlated. A part of the circuit (T20,T21,S1,S2,S3,S4) is modified du... | 10/22/2002 |
| 5502392 | Methods for the measurement of the frequency dependent complex propagation matrix, impedance matrix and admittance matrix of coupled transmission lines A method for completely characterizing coupled transmission lines by short-pulse propagation is described. The complex frequency-dependent propagation matrix, impedance matrix and admittance matrix for a set of n parallel transmission lines can be determi... | 03/26/1996 |
| 5495173 | Method and apparatus for characterizing a differential circuit A method and apparatus is provided for characterizing a differential circuit. A measurement system (200) is used to introduce input signals to the differential circuit and to measure corresponding output signals. Particularly, an input differential wave i... | 02/27/1996 |
| 5488306 | Open and short fault detector for a differential interface An improved cable fault detection system which makes the fault detection independent of the ground shift between units coupled to the interface. This fault detection is based on differentially sensing the voltage on a wire pair, in a cable, and using the ... | 01/30/1996 |
| 4996488 | Measuring and limiting EMI with a selectable mode reflection network Selectable mode rejection network (SMRN) for electromagnetic interference (EMI) excludes common mode (CM) and, alternatively, differential mode (DM) conducted emissions (CE) from entering power transmission lines from electrical equipment powered from suc... | 02/26/1991 |
| 4825148 | Resistance measurement circuit and method An impedance measurement circuit and method is disclosed that uses a differential amplifier to amplify a DC voltage value developed across a device being measured. The device is biased between potentials of a source of electrical energy by first and secon... | 04/25/1989 |
| 4263549 | Apparatus for determining differential mode and common mode noise Apparatus for isolating common mode and differential mode radio frequency noise in electronic and digital equipment from each other and quantitatively determining or displaying each for conformity to standard and for correction. The apparatus is likewise ... | 04/21/1981 |
| 4135152 | System for monitoring and measuring high voltage D.C. transmission line current An yttrium-iron-garnet (YIG) tuned reflection filter is placed in the magnetic field adjacent a High Voltage Direct Current Transmission Line. A YIG filter receives a microwave signal from a remote transmitter and the same signal is modified by the YIG fi... | 01/16/1979 |
| 4108404 | Arrangement for protecting data communication in a continuous automatic train control system A system for protecting data communication against disturbances caused by unsymmetrical standing waves along track conductors wherein automatically controlled terminating resistors are utilized to prevent the formation of standing waves either totally or ... | 08/22/1978 |
