Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 7030733 | Power supply for phantom-feed LAN connected device using spare-pair powering A system for providing power to a local area network LAN connected device via spare wire pairs from a phantom feed LAN, the system comprising a first connector for connecting to the LAN connected device; a second connector for connecting to a LAN hub; and means for ... | 04/18/2006 |
| 7020164 | System and method for special signaling with customer premises equipment A system and method are provided for special signaling with customer premises equipment. The system includes loop termination equipment coupled to a local loop and comprising a signal generator. The system also includes customer premises equipment coupled to the loc... | 03/28/2006 |
| 6728309 | Method and apparatus for high speed data transmission over a four-wire subscriber line Disclosed is an architecture and method for high speed transmission over a four-wire subscriber line. Each modem in the present invention includes a V.90 transmit section and a V.90 receive section. The V.90 transmit section is dedicated to transmitting data over on... | 04/27/2004 |
| 5414763 | Apparatus and method for providing echo suppression to a plurality of telephones A telephone switching apparatus includes a line network to which first and second telephones are connected and a hands-free trunk whose input and output terminals are connected to the line network. The line network is controlled such that voices from the ... | 05/09/1995 |
| 5325428 | Automatic switching-back device for telephone circuit The communication carried out by an auxiliary terminal machine (AUX) utilizes audio signal wires picked up out of an 8-circuit and 6-contact switch (SW) or an 8-circuit and 3-contact switch (SW). An automatic switching circuit (SS), connected to the audio... | 06/28/1994 |
| 5034978 | Universal channel unit switchable between two wire and four wire configurations The universal channel unit includes a channel interface circuit that uses a pair of fixed ratio transformers to terminate both two wire and four wire analog transmission facilities on a selectable basis. The universal channel unit also includes a pluralit... | 07/23/1991 |
| 5027347 | Intercom system The invention relates to an intercom system comprising a central unit and several remote stations connected by two-way lines to the central unit into a star network, whereby the lines are selectively interconnectable via the central unit for establishing ... | 06/25/1991 |
| 4953055 | System and a protection and remote power-feeding device for equipment connected by two transformers to a four-wire transmission link A remote power-feeding and protection system for equipment connected by two transformers to a four-wire transmission link. The remote power-feeding and protection system and the remote power-feeding extractor protection device are intended for equipment connec... | 08/28/1990 |
| 4598172 | Telecommunication terminal Telecommunication terminal with automatic switching from 4-wire to 2-wire operation. The terminal is provided with a voltage sensing circuit (5) sensing the way in which DC voltage is fed to the terminal, and in repsonse therto controlling switches (8,11)... | 07/01/1986 |
| 4538033 | Data bridge with gating and/or testing A communication bridge joining a primary communication channel to a plurality of secondary communication channels has electrically operated switches in series with the respective ports to the secondary communication channels. Control signals applied to th... | 08/27/1985 |
| 4403119 | DTMF Activated remote telephone line switching and testing DTMF (dual-tone multi-frequency) activated apparatus for remote switching and testing of a four-wire telephone line system is disclosed. The telephone line provides four-wire service between a first location and a plurality of second remote locations. By ... | 09/06/1983 |
| 4347409 | Key telephone system A key telephone system comprises a main equipment connected to at least one set of central office (CO) lines and capable of connecting thereto a plurality of key telephones. The main equipment includes a dual tone multifrequency (DTMF) sending circuit com... | 08/31/1982 |
| 4288664 | Neutralization signal developing device for an echo suppressor A device for developing a neutralization signal for an echo suppressor is required for the transmission of data over a telephone line having four-wire circuits. Each transmission of data is preceded by an identification signal at a given frequency. An inp... | 09/08/1981 |
| 4258236 | Remote telephone line switching and testing Apparatus for remote switching and testing of a four-wire telephone line system is disclosed. The telephone line provides four-wire service between a first location and one or more second remote locations. The switching and testing apparatus provides the ... | 03/24/1981 |
| 4156114 | Telephone network for verifying operator-initiated calls A network in a four-wire communication system for verifying the source of a call seeking access to restricted telephone channels through a toll switch prior to granting such access comprises handshake circuits on the operator and subscriber sides, respect... | 05/22/1979 |
| 4097690 | Intercommunication and alarm telephone system An intercommunication and alarm telephone system has a common control in the form of a clock driven central unit connected to an alarm control unit and one telephone line shared by a plurality of station units. The central control unit provides means for ... | 06/27/1978 |
| 4008376 | Loudspeaking teleconferencing circuit A loudspeaking teleconferencing circuit serving a plurality of remote conference room locations includes a plurality of speakerphone sets at each conference room location and a communication network connected to an incoming and an outgoing terminal at eac... | 02/15/1977 |
| 3978290 | Digital private automatic branch exchange A private automatic branch exchange utilizing PCM (pulse code modulated) digital technology with a four wire non-blocking PCM network having an ability to provide a double (three port) connection for each inlet, on a digital basis is disclosed. As a resul... | 08/31/1976 |
