Quotables
"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 7315592 | Common mode noise cancellation A noise cancellation system configured to isolate and process a common mode noise signal to generate a cancellation signal. The cancellation signal is combined with a differential signal to cancel unwanted differential mode noise that coupled onto the differential s... | 01/01/2008 |
| 7132613 | Methods, systems, and terminals for load coil switching A method for constructing a transmission line unit such that load coils can be selectively connected to a transmission line includes providing a transmission line section having a transmission line and a plurality of load coils electrically connected thereto, and co... | 11/07/2006 |
| 7079773 | Power feeding for an optical transmission system A method and an apparatus for optical transmission line power feed interference compensation for compensating for an electrical interference signal in a power feed conductor (12; 52) and in an associated second conductor (14; 54). The interference sign... | 07/18/2006 |
| 6974906 | low interferance cable A signal cable lead structure in which each lead inside the cable is formed in a generally rectangular shape such that current passing through each segment of the lead is traveling in the opposite direction from current passing through an adjacent segment of the sam... | 12/13/2005 |
| 6947529 | DSL compatible load coil A load coil is disposed along a local loop for conditioning POTS signals while permitting passage of higher frequency DSL signals with low attenuation. In one embodiment, the load coil includes a coupled inductor having multiple capacitive elements coupled thereto, ... | 09/20/2005 |
| 6751315 | High bandwidth phone line transceiver with capacitor isolation A high bandwidth telephone line transceiver for connecting telecommunications equipment to a telephone line provides a pair of isolation capacitors connected to the telephone line to transmit the telephone signals across the requisite electrical isolation barrier. T... | 06/15/2004 |
| 6546100 | Load coil device A load coil device for a twisted pair telephone line is disclosed. The device is for compensating distributed stray capacitance in telephone lines that are longer the 18,000 feet. Typically, a load coil device would be inserted in the line every 6,000 fee... | 04/08/2003 |
| 5943392 | Device for measuring echo return loss in a two-two wire line system The present invention is directed to an adaptor for measuring an echo return loss in a communication system. The adaptor includes two transformers, each having a primary winding and two secondary windings. The secondary windings are cross-connected to for... | 08/24/1999 |
| 5517066 | Constant voltage drive type driver circuit A constant voltage drive type driver circuit includes a pulse transformer for outputting output pulses having a predetermined peak value and having primary and primary windings. The secondary winding has first and second terminals and an equivalent load i... | 05/14/1996 |
| 5500894 | Telephone line interface with AC and DC transconductance loops A method and apparatus for providing a telephone line interface having selectable termination characteristics, such as impedance parameters, is provided using AC and DC transconductance loops. The present invention may be used with modem apparatus to prov... | 03/19/1996 |
| 5363429 | Radio telephone device capable of identifying an interrupting caller and telephone system using the same Information on the telephone number of a terminal which made an interrupting call during telephonic communication is detected, displayed on a display and stored in memory. After completion of the telephone communication, the information on the telephone n... | 11/08/1994 |
| 4945332 | Noise suppression inductor A noise suppression inductor including a bobbin having a spool divided into a plurality of spool portions, a core mounted on the bobbin, at least one coil wound around the spool portions into a plurality of coil portions and a plurality of terminal pins c... | 07/31/1990 |
| 4779068 | Noise suppression inductor A noise suppression inductor including a bobbin having a spool divided into a plurality of spool portions, a core mounted on the bobbin, at least one coil wound around the spool portions into a plurality of coil portions and a plurality of terminal pins c... | 10/18/1988 |
| 4434497 | Response time bidirectional circuitry Bidirectional circuitry, which includes two amplifiers, each having a capacitor connected between an input and an output terminal thereof, and two interrupt transistors, acts to provide amplification and/or level shifting of information between two transc... | 02/28/1984 |
| 3932713 | Induction cancellation circuit An induction cancellation circuit is used to minimize the effects of AC induced signals appearing on a pair of telephone lines on the activation of a current sensor by a DC loop current flowing on the telephone lines. An input of the current sensor is cou... | 01/13/1976 |
