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A self defense weapon formed as a memo pad and which is easily held by a person's fingers, therefore making it possible to provide protection from a mugger and also to quickly and easily write a record or a message without failure of missing or forgetting significant information under a stressful situation.
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| Number | Title | Issue Date |
| 5375122 | Telephony device for a telephony communications network with fixed stations and independent stations A fixed station (BFR1) is able to interact with a plurality of independent stations (SA1, . . . , SA4) and is linked to an external management unit (UGRB1) only by the intermediary of a single pair of telephony wires (LT). This management unit (UGRB1) the... | 12/20/1994 |
| 5363375 | Method and apparatus for synchronizing timing among radio ports in wireless communications systems using hierarchical scheme In a TDM/TDMA digital radio communications system a few selected ports are connected to a fixed common timing reference and designated as master ports. Each master port is assigned a hierarchical value of zero. Every other port is initialized a high hiera... | 11/08/1994 |
| 5363376 | Method and apparatus for synchronizing timing among radio ports in wireless communications systems In a TDM/TDMA digital radio communications system, time synchronization between fixed ports is achieved by adjusting the timing of a first port in response to the average timing difference between the timing of that first port and the timing measured by t... | 11/08/1994 |
| 5361302 | Method for encryption sync compression in an encrypted radio telephone interconnect system A method for transparently coupling an encrypted two-way RF communication unit (100) with an encrypted landline communication unit (104). An RF message comprised of a plurality of data frames (401,402, 403) is transmitted from the RF communication unit (1... | 11/01/1994 |
| 5337344 | Telecommunication system and a method for matching the numbering schemes of two telecommunication systems The invention relates to a telecommunication system and a method for matching the numbering schemes of telecommunication systems. The telecommunication system comprises a transmission network comprising at least one mobile exchange (MSC1, MSC2) associated... | 08/09/1994 |
| 5327574 | Mobile communication system A mobile communication system comprises a switching station, base stations to constitute respective zones, and mobile stations moving in a service zone formed by the communication zones. Plural base stations exist in one communication zone, and one specif... | 07/05/1994 |
| 5280521 | Portable telephone system A portable telephone system is disclosed in which a plurality of i-th class exchanges, which accommodate key service units of a plurality of portable telephone sets present in each service area, and at least one (i+1)th class exchange which accommodates t... | 01/18/1994 |
| 5103474 | Drive-by personnel monitoring system with radio link A personnel monitoring system for monitoring presence or absence of particular individuals at preassigned monitoring locations. A local unit is provided at each monitoring location for detecting presence or absence. Each local unit is arranged for short r... | 04/07/1992 |
| 4993061 | Portable miniature high fidelity stereo tape player and cordless radio telephone system A portable high fidelity tape player and cordless radio telephone system includes a base unit, a handset unit and a stereo unit, in which the stereo unit includes a carrier filter, a carrier receiver, a pilot tone filter, a pilot tone decorder, a modulati... | 02/12/1991 |
| 4977589 | Signalling and control protocol for a communication system A signalling and control protocol is provided wherein each subscriber unit (106) operating within a communication system (100) must transmit a request (200, 200' or 200") to communicate to a central station. If a communication channel is available, the ce... | 12/11/1990 |
| 4816826 | Digital telephone switching system having a message switch with address translation The invention provides a communications system comprising a plurality of functional units including a switching network and peripheral units, and a message switch comprising a processor and data port circuits for interfacing with respective ones of the fu... | 03/28/1989 |
| 4796291 | Mobile radio communications system A mobile radio communications system for wide area mobile radio communications allows any two remote mobile stations to hold communications by way of a public switching network. A fixed station governing an area in which a calling mobile station is locate... | 01/03/1989 |
| 4785450 | Apparatus and method for obtaining frequency agility in digital communication systems In a communication system that comprises a plurality of subscriber stations in RF communication with a base station having multiple sequentially repetitive time slots, each time slot being assigned to a particular subscriber station, means to change eithe... | 11/15/1988 |
| 4737977 | Device and method for switching communications among taxis A user connected by telephone to a central telephone exchange can inform an automatic switching communications device directly of his own telephone number by dialing on his telephone set, which determines the corresponding address and all other possible c... | 04/12/1988 |
| 4726052 | Radio telephone system and method for controlling same In a radio telephone system comprising a radio telephone set utilizing a rechargeable battery, and a base unit connected to the radio telepone set through a radio channel for exchanging a speech signal between the radio telephone set and a wired telephone... | 02/16/1988 |
| 4682350 | Equipment for wireless telephone transmission A method of connecting audio information between a base telephone unit which is stationary and a portable unit associated therewith, the method involving dividing the communication time for audio information into first and second periods. During each firs... | 07/21/1987 |
| 4677656 | Telephone-radio interconnect system A telephone interconnect system for a two-way radio communications system is disclosed. A telephone patch interconnect unit accepts dialed digits from a telephone line, encodes them into a data packet, and couples the data packet to a fixed transceiver fo... | 06/30/1987 |
| 4675863 | Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels A system for the wireless transmission of multiple information signals utilizing digital time division circuits between a base station and a plurality of subscriber stations. The subscriber stations may be fixed or movable. The number of time division cir... | 06/23/1987 |
| 4635285 | Communication system with voice priority for remote stations A two-way radio communications system of the simplex or half-duplex type having a communication link to a duplex telephone system is provided wherein the simplex or half duplex mobile radio is provided priority to talk upon demand. The communication link ... | 01/06/1987 |
| 4528656 | Radio communication system using frequency division multiplexing for transmission between a master station and a plurality of remote stations A point-to-multipoint radio communication system includes a master station and a plurality of remote stations which communicate with the master station using frequency division multiplexing. Each remote station transmits on a separate frequency, but the r... | 07/09/1985 |
| 4517561 | Selective call, paging and priority signalling system A selective calling, paging and priority signalling system for two way communications between at least one primary and a plurality of remote stations. An automatic selective calling mode is provided in which the primary station operator enters the address... | 05/14/1985 |
| 4434504 | Channeling and decode circuit for airborne radio-telephone systems An airborne radio-telephone transceiver is provided having improved channeling and decode circuitry compatible with the selective signalling call-up system prescribed by the Federal Communications Commission. The decode circuitry includes a filter and det... | 02/28/1984 |
| 4320265 | Line repeater for telephone system using radio links A telephone exchange communicates with a number of scattered local stations via radio links extending from a central terminal to respective peripheral installations each comprising a radio transceiver coupled via a repeater to the line loop of an associat... | 03/16/1982 |
| 4310722 | Mobile radiotelephone station two-way ranging system Some cellular mobile radiotelephone systems use tones for certain call connection supervisory functions on radio links. The presence of the correct tone in a received radio channel call signal is determined by using the received signal for producing (32) ... | 01/12/1982 |
| 4268722 | Radiotelephone communications system A telephone system for providing communications between mobile radiotelephones, portable radiotelephones and landline telephones includes a land-line telephone system including a land-line switching network for providing communication paths for land-line ... | 05/19/1981 |
| 4257119 | PCM switching system for wide and narrow band signals A common control telecommunications switching system capable of efficiently handling both narrow band and wide band information. The system uses a hybrid digital network having a time division section for switching narrow band signals and a space division... | 03/17/1981 |
| 4130731 | Portable telephone system A portable telephone system which utilizes both a VOX and a duplexer network wherein the necessity for the transmission of a continuous signal and continuous receiver scanning is eliminated, thereby conserving power, and wherein the ringing signal is gene... | 12/19/1978 |
| 4125808 | Automatic sequential search for a radio relay network This invention involves the implementation of a mobile, automatic range extension network for a communication system, such as may be used by a field army. Range extension techniques related to this invention are those necessary for the acceptance and rout... | 11/14/1978 |
| 4071711 | Telephone subscriber distribution system This invention relates to a multi-point information distribution system useful for telephone service, data connecting systems and other applications which permits a central station to service a plurality of outlying stations, through transmission media su... | 01/31/1978 |
| 4068104 | Interface for in band SCPC supervisory and signalling system An in band single channel per carrier supervisory and signalling apparatus and method is disclosed for satellite communications. The apparatus includes a near supervisory interface located at a transmitting terminal, and a far supervisory interface locate... | 01/10/1978 |
| 4012596 | Telephone patch Electronic patch circuitry interconnects a wire telephone line with the base station transmitter and receiver of a simplex two-way radio communication system, for causing VOX-type operation with very fast voice-operated keying between transmitter and rece... | 03/15/1977 |
