Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 7268670 | Power line communications system A power line communications technique (PLC) is disclosed which allows communications across any three phase electric system by modulating the impedance through earth between any two points of differing voltage on the electrical system in order to use the power suppl... | 09/11/2007 |
| 5120909 | Terminating devices detection and verification circuit A circuit for detecting and verifying a presence of a terminating device for a high speed data transmission line. The circuit contains a first cable detector which generates a first signal if a first cable is present. A second cable detector generates a s... | 06/09/1992 |
| 4799236 | Telecommunication system comprising a bus conductor and telecommunication stations connected to this bus conductor through transformers A telecommunication system comprising a bus conductor to which respective stations are connected by respective transformers, communication taking place via voltage pulses Vp on the bus. Each voltage pulse Vp causes a magnetizing curr... | 01/17/1989 |
| 4761797 | Flexible regenerator A regenerator 10 is provided with a tuning recovery facility 15 which has a multiple passband capability. The regenerator can operate with several line bit rates each corresponding to one of the passbands.... | 08/02/1988 |
| 4488126 | Equalizer arrangement for mixed-gauge cables An equalizer arrangement comprises a fixed-characteristic equalizer which is supplemented by a variable-amplitude notch equalizer to enable proper equalization of signals transmitted via cables of arbitrarily mixed cable gauges. Automatic control of the n... | 12/11/1984 |
| 4316057 | Circuit arrangement for the automatic, adaptive distortion correction of ringings of at least three-stage base band signal Circuit arrangement for the automatic, adaptive, temporal distortion correction of the ringings of a multi-stage base band signal comprises a controlled-gain amplifier to which the distorted base band signal is supplied. A correction signal device generat... | 02/16/1982 |
| 4303896 | Wide range data cable equalizer An equalizer circuit arrangement is provided for use without readjustment for a wide range of transmission line lengths. The circuit (10) is comprised of a resistor (20) and a capacitor (22) which introduce an additional time constant delay into the trans... | 12/01/1981 |
| 4208640 | Attenuation equalizer for correcting a temperature and frequency-dependent cable attenuation Attenuation equalizer for correcting within a frequency range the temperature and frequency-depending attenuation variation of cables, comprising a cascade arrangement of a fixed and a variable attenuation correction circuit, connected to a control circui... | 06/17/1980 |
| 4187438 | Circuit arrangement for unilaterally scanning distorted teletype characters A circuit for unilaterally scanning teletype characters wherein the characters are supplied to an integrating circuit and to an impulse circuit wherein the impulse circuit can be controlled by the step changes of a character. A comparator circuit receives... | 02/05/1980 |
| 4110711 | Voice/data receiver coupled with a transmission line through an input transformer working into an impedance approaching a short circuit A transmission line having a fixed characteristic impedance, e.g., 600 ohms, is coupled to a receiver through an input transformer working into a very small impedance, e.g., 10 ohms or less. As compared to a conventional arrangement, where an input transf... | 08/29/1978 |
| 4028644 | System equalization for repeatered submarine cable system A system equalizer and a method of equalization employed in a repeatered submarine cable system, in which automatic gain controlled (AGC) submerged repeaters are employed to compensate for fluctuations of the cable loss caused by the temperature fluctuati... | 06/07/1977 |
| 3972020 | Transformerless input for seismic data acquisition system In a long line data acquisition system, an input network is provided for coupling the lines to a data acquisition unit. The network includes the cascade combination of a first filter presenting a low pass frequency response to common mode voltage and a se... | 07/27/1976 |
