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| Number | Title | Issue Date |
| 7209719 | Home power line network connected phone The present invention is directed to a cellular or cordless phone whereby power line networking is either integrated within its base station and/or charger or added as a module that can be installed into the base station and/or charger, providing a method of transfe... | 04/24/2007 |
| 6868081 | Method and apparatus for simultaneous multiline phone and data services over a single access facility According to the invention, a method and apparatus are disclosed for providing multiline telephonic and data services over a single access facility. In one embodiment of the present invention, a wall unit is located at a customer premises which terminates a single a... | 03/15/2005 |
| 6711238 | Parallel-connected dialing signal transmission inhibiting device for data transfer over a telephone link A parallel-connected dialing signal detection and transmission-inhibiting device is disclosed which detects dual-tone multi-frequency dialing signals across tip and ring conductors of a telephone link and switches in an a.c. load that attenuates the dialing signals ... | 03/23/2004 |
| 6606134 | Reflective ferroelectric liquid crystal display and projection system A major disadvantage of known reflective displays consists in the fact that they ideally have a switching angle of &#b1;45° in the so-called symmetric mode. With the liquid crystal mixtures known to date, this is not possible without hysteresis effects o... | 08/12/2003 |
| 6263063 | System and method for provisioning an extra line on demand and for selectively connecting calls with a plurality of devices A network interface device that allows a user to simultaneously receive/send a plurality of calls from/to a telecommunications network by multiplexing/demultiplexing the calls on a single telephone line. The network interface device allows for the provisi... | 07/17/2001 |
| 6240171 | Call controlling apparatus and method used for an order-wire system in a communication system A call controlling apparatus for receiving input signals each including a phone number through respective communication channels and making a call. The apparatus provides a plurality of telephones corresponding respectively to the channels and a storage s... | 05/29/2001 |
| 5970122 | Two-way wireless messaging system having user agent A two-way wireless messaging system includes a messaging network having at least one user agent corresponding to a subscriber of a two-way wireless messaging service. The subscriber receives messages from the messaging network along a first communication ... | 10/19/1999 |
| 5708701 | Power line telephone communications system having on hook digital voiceband messaging A power line telephone communications system having an ON HOOK digital voiceband messaging feature by which selected information contained in an incoming call to a telephone is received prior tc the telephone being lifted off its hook. The incoming ring s... | 01/13/1998 |
| 5594788 | Telephone system and interface device An improved telephone interface device communicatively couples a local telephone set to an inside telephone wire which, in turn, is communicatively coupled to an outside telephone line from a central office of a telephone service provider. The interface d... | 01/14/1997 |
| 5550915 | Apparatus for use in completing telephone calls A telephone station set is arranged to automatically prefix calls with the access code of a particular, preselected IXC. In one embodiment, the telephone station set is arranged to have at least one locking button that corresponds to an IXC and whenever t... | 08/27/1996 |
| 5390240 | Data dial system and method A data dial system having at least one matrix switch, one or more user terminals, one or more Touch-Tone push button telephones, and at least one processor. The matrix switch can switch the user terminals between various inputs and outputs. The Touch-Tone... | 02/14/1995 |
| 5216708 | Calling signal controller A calling signal controller in which a calling signal generator having a necessary and minimum output capacity is used to the most efficiently possible extent. The controller includes a phase number memory specifying the total number of phases of calling ... | 06/01/1993 |
| 5179588 | Improved page party system A page party system for use in industrial environments, having a plurality of stations joined by a page line and by a single party line for providing multiple full-duplex conference calls over the single party line. Multiple full-duplex conferencing is ac... | 01/12/1993 |
| 5073922 | Communication terminal apparatus A communication terminal apparatus is used in a network system in which a sub address is affixed to a subscriber apparatuses from each other. A proper incoming call indicating tone is registered beforehand in correspondence with a sub address, and an inco... | 12/17/1991 |
| 4958370 | Control system for a plurality of telephone sets A control system for a plurality of telephone sets connected as branched to a central office line allows extension calling, privacy function setting and hold releasing operations between the telephone sets. Each of the telephone sets in the branched conne... | 09/18/1990 |
| 4932043 | Apparatus for controlling key telephone station set in key telephone system A key telephone system including a key service unit, a plurality of key telephone station sets which are connected via speech lines for transmission of speech signals and via data lines for transmission of data, and a device provided at the key service un... | 06/05/1990 |
| 4852156 | Private telephone system using a personal code number to access the telephone nearest to the code number holder A telephone system, wherein an IC card device storing a personal ID number is inserted into the telephone nearest the owner of the IC card device, thus registering the personal ID number in association with the nearest telephone. Once the personal ID numb... | 07/25/1989 |
| 4782515 | Digitally controlled intercommunications system An intercommunications system for the selective establishment of two-way communications between a multiplicity of stations is disclosed and comprises a terminal located at each station and a communications network including a predetermined number of lines... | 11/01/1988 |
| 4658095 | Building intercom system An intercom system for a building having several occupied units served by the same entrance with a locked door. A control panel at the entrance has several call switches, one for each occupied unit. An individual two-wire line extends between the entrance... | 04/14/1987 |
| 4308427 | Hands-free talk-back intercommunication system A hands-free talk-back two-way intercommunication system is disclosed. The system includes a plurality of local stations connected to a main distribution station. Also connected to the main distribution station may be a direct station selector. At least o... | 12/29/1981 |
| 4215248 | Telephone intercom circuit A multi-link intercom with a sequencing logic circuit for controlling a solid state switching matrix to connect station through an available link. Control information from the stations is decoded and stored in a register under sequence control for complet... | 07/29/1980 |
| 4081614 | Supervised single link telephone system An administrative telephone system for use in schools, hospitals and the like which includes a dialable administrative telephone set and a plurality of dialless remote or "staff" telephone stations having identifying numbers, interconnected by a central e... | 03/28/1978 |
| 3978468 | Intercom call signaling mechanism The master unit of an intercom in a building includes a digital code selector operating a digital coder for transmission of remote unit identification code signals to the intercom receivers of several remote units for alerting persons at such respective u... | 08/31/1976 |
| 3976847 | Key telephone system intercom arrangement A key telephone system is disclosed in which intercom calls may be answered "hands-free" at the called station. Intercom calls are originated in the standard manner, with the subscriber picking up the handset at the calling station and dialing the number ... | 08/24/1976 |
