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| Number | Title | Issue Date |
| 5471518 | Method and apparatus for non-volatile data storage in radio telephones and the like A cellular telephone (10) stores both the programming for its processor (18) and certain changing parameters in the same flash-memory device (36). The device is sectored so that the changeable parameters can be erased without erasing the program contents,... | 11/28/1995 |
| 5459774 | Dialing prefix method and apparatus In a radio telephone (100, 200) having a keypad (206) for receiving first information (302), a memory (112) for storing second information (313), and an intelligent editing function. There is provided a method of transmitting information representing a ph... | 10/17/1995 |
| 5450438 | Fallback method to 1200 bits per second for use in mobile radio In a mobile data communications system, a near-end modem initiates a data connection to a far-end modem at the highest permissible data rate, e.g., at 9600 bits per second (bps). If the communications channel subsequently degrades, either the near-end mod... | 09/12/1995 |
| 5444762 | Method and apparatus for reducing interference among cellular telephone signals Directional antennae on aircraft and on cellular telephone base stations, having a polarity opposite that of potentially interfering ground system signals, minimize signal strength of air cellular signals received by ground cellular stations. Aircraft dir... | 08/22/1995 |
| 5442683 | Directory structure for large scale telecommunications network allowing location of roaming mobile subscribers A mobile telecommunications system for a large area telecommunications system, including a plurality of different networks, has a directory/network structure for minimizing data storage and transmission and switching capacity requirements for locating roa... | 08/15/1995 |
| 5442680 | Dual system cellular cordless radiotelephone apparatus with sub-data channel timing monitor A cellular cordless telephone may receive cellular telephone calls via a cellular telephone system and receive telephone calls on a system having a limited radio coverage area. To reduce the amount of time spent in monitoring the sub-data channel of the l... | 08/15/1995 |
| 5440613 | Architecture for a cellular wireless telecommunication system This invention relates to a method and apparatus for offering wireless telecommunication service. A switch such as an automatic Private Branch Exchange (PBX), equipped to communicate with Integrated Services Digital Network (ISDN) station sends ISDN signa... | 08/08/1995 |
| 5432838 | Communication system A communication system, particularly for a mine, has a broad band distribution system. Antennas, which may comprise leaky coax feeders, are connected to this distribution system by interface units. As required, the interface units effect signal level adju... | 07/11/1995 |
| 5432843 | Method of performing handoff in a cellular communication system The method consists of analyzing a handoff request received from a source base station at a source base site controller (BSC). If the handoff request contains a preferred base site list (is from a MAHO environment) the request is forwarded to the mobile s... | 07/11/1995 |
| 5432842 | Mobile communication switching across cell boundaries With respect to a mobile communication system, intelligence learns a cell boundary where the field strength of adjacent base stations becomes equal, by measuring field strength of communications, and from this data determined and stored over a period of t... | 07/11/1995 |
| 5428667 | Multi-channel cellular communications intercept system A multi-channel cellular communications intercept system for monitoring and then intercepting communications between a mobile unit and a base station in one cell of a cellular telephone system. The system includes a controller and a plurality of receivers... | 06/27/1995 |
| 5422935 | Method of and apparatus for providing a local PSTN interconnect with a cellular base site A method and apparatus is provided for locally routing calls in a communication system. The method and apparatus provide PSTN interconnects (N, P, Q,) at each of the base station controllers (11, 14) and at the mobile switching center (12). A control inte... | 06/06/1995 |
| 5420908 | Method and apparatus for preventing wireless fraud The use of stolen mobile identification number (MIN) and electronic serial number (ESN) information to fraudulently place wireless calls is prevented by having the switches of multiple wireless carriers forward or direct, over a telephone connection, all ... | 05/30/1995 |
| 5420911 | Cellular telephone for monitoring analog and digital control channels The present invention is directed to a cellular mobile radio telephone system in which mobile stations may select either analog or digital control channels. Analog and dual-mode mobile stations are equipped to become multi-mode mobile stations which monit... | 05/30/1995 |
| 5418835 | Method of delivering paging messages using voice mail In a cellular communication system, the delivery of a page or message is attempted over the system to a user of the system. If the page or message is undeliverable before a set period of time, the page or message is converted to a voice mail message. The ... | 05/23/1995 |
| 5416828 | Interface device for an automobile telephone-set with a data transmission device An interface device for an automobile telephone-set with a data transmission device-includes a switch for selectively connecting voice lines of a radio-transmitter/receiver to one of the telephone-set and the data transmission device, a distinguishing dev... | 05/16/1995 |
| 5414753 | Number assignment module setting system for portable telephone set In a number assignment module setting system for a portable telephone set, a portable telephone set inputs number assignment module in a number assignment module setting mode. A number assignment module setting adapter is connected to the telephone set to... | 05/09/1995 |
| 5410587 | Ultrasonic radiotelephone for an automobile A car radiotelephone system having one or more wireless handsets communicating voice and control information via an ultrasonic link with a stationary unit connected functionally to a base station. The base unit (1) is connected by two cables, an audio-out... | 04/25/1995 |
| 5408514 | Method of handover and route diversity in mobile radio communication A method of handover and route diversity in a mobile radio communication which is less time consuming and capable of improving the frequency spectrum utilization efficiency and securing the high quality of service regardless of the moving speed of the mob... | 04/18/1995 |
| 5408513 | Portable credit card terminal interface A portable credit card terminal interface is disclosed for verifying credit information. The portable credit card terminal interface is adapted to be removably connected to a credit card terminal and to a telephone station. The credit card terminal interf... | 04/18/1995 |
| 5404391 | Incoming call alert system for cellular telephones without wired connection thereto Each of the cellular telephones is adapted to receive a paging signal and to transmit a voice channel signal on a voice channel frequency in response to the paging signal. The alert system includes a receiver tuned to receive the voice channel frequency. ... | 04/04/1995 |
| 5404390 | Portable telephone set A rod antenna is contained to be slant in a housing case, such that a top of the rod antenna is positioned on the side of the housing case remote from a user head, and a bottom of the rod antenna is on the side of the housing case near the user head. The ... | 04/04/1995 |
| 5402467 | Portable paging telephone system with improved response signal verification mode A portable paging telephone system comprises a mobile telephone terminal device 4 and a base station 6 which form a speech path with a mobile station such as an automobile telephone set or a portable telephone set, as well as a wireless paging terminal de... | 03/28/1995 |
| 5402481 | Abbreviated and enhanced dialing apparatus and methods particularly adapted cellular or other types of telephone systems An abbreviated dialing apparatus especially suitable for cellular/mobile phone use, enabling a user to dial telephone numbers having repetetive digits without directly dialing all of the repetetive digits. The user, by executing a prescribed actuation of ... | 03/28/1995 |
| 5400388 | Circuit and method for operating a radio telephone upon loss of AC power A circuit for preventing a radio telephone engaged in a call from being cut off when a power failure occurs, wherein the radio telephone is branched with a wire telephone by a telephone line. When the power is off while engaged in a call, the telephone li... | 03/21/1995 |
| 5396538 | Contactless digital power transmission and reception system in a radio telephone A contactless charging system of a radio telephone comprising a portable device and a base unit, for charging a battery of the portable device, without electrical contact, by induction voltage of an electromagnetic field formed by the inductive coupling o... | 03/07/1995 |
| 5388148 | Cellular telephone calling system using credit card validation The cellular telephone credit card calling system works in conjunction with a cellular telephone, a local cellular network and an IXC in a telecommunications network. The cellular telephone has a handset and a transceiver unit coupled together by a power ... | 02/07/1995 |
| 5386457 | Method and apparatus for resolving contention between multiple base units during a call setup in a public cordless telephone system A cordless telephone public base unit employed in a public telephone system in close proximity with other public base units effectively avoids contention with these other base units for access to a cordless telephone handset unit generating a service requ... | 01/31/1995 |
| 5379339 | Method and apparatus for calling a handset unit in radio telephone system A radio telephone system is comprised of a communication network, a cordless telephone apparatus and a plurality of public radio base stations, both being connected to the communication network, and a handset unit of the cordless telephone apparatus is ca... | 01/03/1995 |
| 5375161 | Telephone control system with branch routing A method and apparatus for processing incoming telephone calls to a telephone control system. The apparatus includes a memory for storing electronic signals including signals representative of telephone network addresses and a processing unit for processi... | 12/20/1994 |
| 5375163 | Multi-channel cordless telephone system for maintaining master-slave communication A cordless telephone provided with a master unit and a slave unit which use a plurality of communication channels. In the case where information indicating a currently used channel or a usually used channel, which has been stored in the master unit, is lo... | 12/20/1994 |
| 5371783 | Method for continually monitoring the status of a radio frequency link A digital cordless telephone apparatus comprising a microprocessor based battery powered portable handset unit and a microprocessor based stationary base unit which each transmit and receive digital voice data and digital command data to and from one anot... | 12/06/1994 |
| 5369684 | Apparatus and method for directing calls to mobile station subscribers The present invention provides a mobile communications system in which the home exchange of a mobile subscriber maintains information indicative of where the mobile subscriber might be found, Upon receipt of a call, the home exchange requests the exchange... | 11/29/1994 |
| 5367559 | Sequential power estimation for cellular system handoff Cellular handoff is improved by tailing or adapting the measurement time based on the characteristics of the received signal intensity or power. More particularly, base stations typically measure mobile signal power in order to determine the necessity for... | 11/22/1994 |
| 5365572 | Cordless key telephone system with multiple tenant facility In a cordless key telephone system in which radio-frequency connections are established between exchange lines and cordless stations in response to a call request, a ringing signal is transmitted in response to an incoming call by containing in it the ide... | 11/15/1994 |
| 5363430 | Cordless telephone apparatus having a low power stand-by mode and a hold mode A cordless telephone having a handset unit, which is powered by a battery, and a base unit for communicating with a desired party. A telephone conversation with the desired party may be interrupted by activating a hold mode. The hold mode is released by e... | 11/08/1994 |
| 5363427 | Telephone resource allocation method in a communication system In a communication system that provides access to telephone resources of different types, a resource allocator of the communication system may more efficiently allocate the telephone resources in the following manner. Once a communication unit of a first ... | 11/08/1994 |
| 5361294 | Method and apparatus for noise quieting during resynchronization of a digital communication system A method and apparatus eliminates an audible noise burst after reestablishment of an external timing signal in a radio base station (102). After a loss of the external timing signal, the base station (102) temporarily operates from an internal timing sign... | 11/01/1994 |
| 5357559 | Listening control channel in a cellular mobile radiotelephone system A cellular mobile radiotelephone system listens for call accesses on a control channel of an umbrella cell and on a control channel of a microcell located within said umbrella cell and responds to the call access only on the control channel of the umbrell... | 10/18/1994 |
| 5353332 | Method and apparatus for communication control in a radiotelephone system In a radiotelephone system, the control channel of each cell can be configured to broadcast absolute information about its cell and relative information about other cells including the characteristic of the cell. Further, the location of other control cha... | 10/04/1994 |
