Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 5125101 | Trunking method and apparatus for establishing communication in a two-way mobile radio system A moble radio system is disclosed in which communication is established between at least two user-operable stations over one of a plurality of channels by operating the user-operable stations in accordance with the following steps: (1) When in the receive... | 06/23/1992 |
| 5101503 | Method of connecting channels of decentralized radio systems In a method of connecting channels of a plurality of decentralized radio systems which perform independent channel connections, each of the plurality of radio systems sets a given channel and monitors a reception signal level of the given channel. Each ra... | 03/31/1992 |
| 5093928 | Channel selection system for mobile radio communication equipment A channel selection system for radio communication equipment which uses a control channel for interchanging control signals for connection and a plurality of data channels for interchanging data and emits an electromagnetic wave by using any one of the da... | 03/03/1992 |
| 5088094 | Accessing of transmission channels of a communication system In a communications system with a plurality of subscriber stations independent from each other, where each subscriber station can access according to a multiple access method a joint duplex transmission channel, the probability becomes very large for simu... | 02/11/1992 |
| 5027431 | Radio communication apparatus A radio communication apparatus includes a device for sequentially discriminating whether or not different frequency channels are open or occupied and generating channel-condition signals representative thereof during each of cycles of a channel scan. The... | 06/25/1991 |
| 5023932 | Radio communication system comprising a portable unit carrying out a battery saving operation related to a scanning operation of a fixed unit In a radio communication system comprising a fixed unit (10) carrying out a first scanning operation at a channel scanning period in a waiting state and a portable unit (11) intermittently put in a waiting state thereof into active and inactive for active... | 06/11/1991 |
| 4982441 | Radio communication system In the radio communication system for performing a communication in the idle channel selected from a plurality of frequency channels, the originating call station transmits the station identification code to specify the distant station together with the i... | 01/01/1991 |
| 4977608 | Radio communication system In the radio communication system for performing a communication in the idle channel selected from a plurality of frequency channels, the originating call station transmits the station identification code to specify the distant station together with the i... | 12/11/1990 |
| 4972355 | Method for radiotelephone autonomous registration A cellular radiotelephone autonomous registration method. The radiotelephone attempts registration when a clock count transmitted by the system equals or exceeds the radiotelephone's threshold count (201). The radiotelephone then scans (202) available cha... | 11/20/1990 |
| 4872205 | Radio communication system having autonomously selected transmission frequencies When the disclosed frequency-hopping communication system is initially enabled, it detects another system operating within range by listening for a predefined radio frequency of a fixed duration. When that particular frequency is detected, the system know... | 10/03/1989 |
| 4850030 | Radio communication system for communicating between two stations upon automatic switching to an idle communication channel In the radio communication system for performing a communication in the idle channel selected from a plurality of frequency channels, the originating call station transmits the station identification code to specify the distant station together with the i... | 07/18/1989 |
| 4768220 | Channel selection in a multichannel access radio communication system without occurrence of interference In a channel selecting device which is for use in a station of a multichannel access radio communication system comprising that station and a plurality of other stations, a control channel, and a predetermined number of speech channels and which includes ... | 08/30/1988 |
| 4741049 | Automatic channel selecting system using shared duplex channels A plurality of duplex channel pairs are shared by a number of stations having equal priority for calling other stations in the system. In resting condition, the station receiver section scans channels allocated to this station's use, in a search to identi... | 04/26/1988 |
| 4649567 | Dispatch overdialing for inter-group and other added calling/called access to communications channels in a trunked radio communications system "Dispatch overdialing" permits radio transceivers already communicating via a repeater with other transceivers in a trunked radio communications system to call additional radio transceivers onto the communications channel in use. A radio transceiver in a ... | 03/10/1987 |
| 4628537 | System for identifying a responding station for a radio communications system A communications system for identifying a responding station called by a communications system caller station over a call channel and a plurality of speech channels. The system transmits information from the caller station, such as the selected speech cha... | 12/09/1986 |
| 4601059 | Communications control circuit with adaptive timing A communications control circuit including a monitor circuit for receiving transmissions of a first and second frequency from a base radio station to other radio stations and measuring several time intervals, each time interval being the time from the end... | 07/15/1986 |
| 4580266 | Method of radio telecommunication and device for implementation thereof Method and device for radio telecommunication between a central station and a certain number of peripheral stations. In each station, a device 1 is connected to a radio transmitter-receiver 2 and comprises a keyboard 5 for introducing messages which are s... | 04/01/1986 |
| 4534061 | Deterministic multi-access method for a decentralized mobile radio system A mobile radio system uses a predetermined number of control channels over which a hand-shake routine is performed to determine called station availability, before one of a limited number of talk channels (local and repeater) is assigned for communication... | 08/06/1985 |
| 4409687 | Arrangement and method for establishing radio communication in a system Communication between a first radio transmitter and receiver and a second radio transmitter and receiver is provided by a system repeater. An arrangement for each radio transmitter and receiver in the system establishes communication on a radio frequency ... | 10/11/1983 |
| 4376310 | Mobile data terminal channel busy arrangement A channel busy arrangement for use in a radio-based data transmission system comprising a plurality of data terminals. A carrier activity signal (CAS) generated by a receiver associated with a data terminal is used to trigger a CAS pulse of approximately ... | 03/08/1983 |
| 4360927 | Repeater trunking system Arrangement for establishing communication between a first mobile radio station and a second mobile radio station through a repeater over a radio frequency channel selected from a plurality of such channels. In an idle mode, a mobile station searches the ... | 11/23/1982 |
| 4145656 | Transceiver capable of sensing a clear channel A transceiver receives electronic input signals comprised of a plurality of frequency bands lying within a plurality of non-overlapping frequency channels. A mixer frequency shifts a selected band to a predetermined center frequency in response to a first... | 03/20/1979 |
