Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 5999824 | Radio signal processing apparatus of portable telephone for sharing digital/analog compatible mode and personal communication service mode A radio signal processing apparatus of a portable telephone which can share a first transmit/receive mode such as a digital/analog (D/A) compatible mode and second transmit/receive mode such as a personal communication service (PCS) mode. The radio signal... | 12/07/1999 |
| 5963853 | Method and arrangement relating to a telecommunication system A radio communications unit that has a casing includes an antenna that is connected to a signal processing unit. A metal object is placed in the casing and connected to an impedance. The antenna receives a radio signal which has repeating fading moments w... | 10/05/1999 |
| 5909640 | Wireless communication system for adapting to frequency drift A wireless communication system with one or more remote transceivers for transmitting a wireless data signal at an actual frequency that is different than the expected frequency and a base transceiver that can automatically adjust to receive the actual fr... | 06/01/1999 |
| 5903835 | Satellite communications adapter for cellular handset A dual-mode telephone with a satellite communication adapter is disclosed. According to one embodiment of the present invention, a cellular-type handportable phone is equipped with a connector for the attachment of accessories. This S connector provide a ... | 05/11/1999 |
| 5826175 | Active tag having one diode for modulation and demodulation Known tags which are capable of receiving and demodulating signals by way of one and the same antenna and by way of one and the same diode, as well as being capable of modulating and transmitting signals, often have a poor efficiency, particularly if the ... | 10/20/1998 |
| 5745848 | Method and apparatus for eliminating interference caused by spurious signals in a communication device An apparatus for eliminating interference caused by spurious signals includes a reference oscillator (127) and a controller (114). Circuitry (500) in a communication device (104) incorporating the apparatus operates at a rate set by a system clock signal ... | 04/28/1998 |
| 5734966 | Wireless communication system for adapting to frequency drift A wireless communication system with one or more remote transceivers for transmitting a wireless data signal at an actual frequency that is different than the expected frequency and a base transceiver that can automatically adjust to receive the actual fr... | 03/31/1998 |
| 5697068 | System and method for providing a non-invasively tunable transceiver synthesizer A transceiver synthesizer includes components that enable it to be tuned non-invasively by software. The transceiver synthesizer includes a non-volatile memory (30) that can be non-invasively programmed with a digital value for each of a number of tuning ... | 12/09/1997 |
| 5640688 | Tuner and splitter-modulator circuit having a common quartz crystal A circuit arrangement comprising a tuner and a splitter-modulator, the latter made up of a splitter and a modulator, the splitter having an RF signal input for receiving an RF input signal, an RF signal output for supplying an RF output signal, and a firs... | 06/17/1997 |
| 5564076 | Portable digital signal transceiver providing communication via a terrestrial network and via a satellite network A dual mode portable digital radio transceiver for communicating via a terrestrial network (first mode) and via a satellite network (second mode) synthesizes a modulation first frequency for modulation of signals transmitted in both modes and a conversion... | 10/08/1996 |
| 5553117 | Vehicular communications system Disclosed is a communications device which includes an integral cellular telephone and two-way radio. The cellular telephone and the two-way radio controlled from a common handset unit. The device has the range and relative transmission security of a cell... | 09/03/1996 |
| 5535432 | Dual-mode satellite/cellular phone with a frequency synthesizer A radio telephone which is capable of switching between operating through a land based cellular network and an orbiting satellite system is disclosed. First antenna and radio frequency circuits receive transmitted signals from the land-based network and f... | 07/09/1996 |
| 5519887 | Switchable filter phase-locked loop frequency synthesizer device and method for achieving dual-mode cellular communications A cellular telecommunications device and method for achieving dual-mode cellular communications. The cellular telecommunication device comprises switchable loop filters, a loop filter switch controller, a programmable frequency synthesizer, and a voltage ... | 05/21/1996 |
| 5515364 | Radio frequency telecommunications transceiver A radio frequency (RF) transceiver includes a direct modulation transmitter and single down-conversion receiver for operation in a time-division-duplex (TDD) telecommunications environment. A single RF signal source, in the form of a phase-lock-loop (PLL)... | 05/07/1996 |
| 5475871 | Communication system with control signal based tuning A communications system (10) comprising a base station (12) for controlling a control channel signal and a plurality of traffic channels and a communications device (17) responsive to the control channel signal (16) and receptive to the plurality of traff... | 12/12/1995 |
| 5448763 | Apparatus and method for operating a phase locked loop frequency synthesizer responsive to radio frequency channel spacing An apparatus and method for operating a phase locked loop frequency synthesizer responsive to radio frequency channel spacing. The phase locked loop (PLL) frequency synthesizer (300) tunes a radio frequency transceiver (100) to a radio frequency channel. ... | 09/05/1995 |
| 5408688 | Method and a device pertaining to an electro-mechanically controlled resonance module Method and apparatus in mobile telephone system including base stations with a plurality of resonance modules, for separately adjusting each resonance module to its own frequency for receiving and expediting telephone signals at this frequency. In each re... | 04/18/1995 |
| 5406617 | Cordless telephone/entry intercom system An intercom capability is added to a basic radio telephone system by configuring the base station to function as a radio repeater for inter-active communication between a telephone/intercom handset and an intercom unit. A distinctive intercom ring signal ... | 04/11/1995 |
| 5390168 | Radio frequency transmission circuit A radio frequency transmission circuit comprising a first signal generating means and a second signal generating means, means for modulating one of the first and second signals to produce a modulated signal, and mixer means to combine the other of the fir... | 02/14/1995 |
| 5327582 | Wideband wireless communications receiver A wideband transceiver using contiguous overlapping frequency range local oscillators (32, 34) for a high side or a low side local oscillator and an intermediate frequency approaching, within commercialy practical limits, but not exceeding one half of the... | 07/05/1994 |
| 5319798 | Radio transceiver having PLL synthesizer A radio transceiver including a PLL synthesizer and is adaptable to a TDMA system in which the frequency of a radio frequency carrier is switched frequently at high speed. When an unlock alarm of the PLL synthesizer is used as one of the device alarms, th... | 06/07/1994 |
| 5293639 | Reduction of power consumption in a portable communication unit Power consumption in a portable communication unit (101) is reduced by first transmitting at a first time, a message (701) at a first transmit power level to a repeater (103) on a first communication channel. At a second time the message (701) is repeated... | 03/08/1994 |
| 5291474 | Procedure for forming frequencies of a digital radio telephone A procedure is utilized for forming the transmission and reception frequencies required for the operation of a digital radio telephone based on time division multiplex access, in particular, in a radio telephone for the GSM system. According to the proced... | 03/01/1994 |
| 5247703 | Transceiver with off hook scanning A transceiver that allows scanning to occur with the microphone in an off hook position. The transceiver includes a main unit, external microphone, and hook for holding the microphone. The external microphone includes a push-to-talk button, which may be p... | 09/21/1993 |
| 5099508 | Radio telephone system for selectively allowing a party in communication with a system user to transmit a voice signal to the user during a hold state A radio telephone system such as a car telephone having a function of selectively allowing a party communicating with a user of the telephone system to transmit a voice signal to the user during a hold state set by the user. When a predetermined time elap... | 03/24/1992 |
| 5086513 | Digital radio transceiver programmer with advanced user interface A digital radio communications transceiver programming apparatus and method are used to load personality defining information in a non-volatile EEPROM memory within a portable or mobile digital radio transceiver. A user interface defines display formats o... | 02/04/1992 |
| 5077783 | Method of simplifying the tuning of a radio telephone In accordance with the invention a radio telephone (1) is tuned so that the tuning equipment (2) selects the signal (S1, S2) to be tuned via the microprocessor (10) and the multiplexer (13), and that the logic controlled amplifiers (11, 11') are controlle... | 12/31/1991 |
| 5040189 | Multiple frequency radio system employing pulse repeaters The pulse communication system includes a plurality of pulse repeaters 10 for receiving and transmitting pulse signals. Each of the pulse repeaters include a frequency controller 22 for selecting one of a sequence of transmit and receive frequencies. The ... | 08/13/1991 |
| 5020135 | Computerized multistandard, field-convertible, multiregional/multiservice, remote controllable, remote programmable mobile two-way radio system with digital serial bus link, built-in programmer and autodiagnostics A Computerized Mobile Two-Way Radio System is provided having microprocessor enhanced capabilities and versatility for wide area/multiple region two-way radio networks with multiple categories of users and adaptability to multiple international standards ... | 05/28/1991 |
| 5020092 | Dual-bandwidth cellular telephone A unique dual-bandwidth cellular telephone includes a transceiver (100) having a dual bandwidth receiver, an audio/logic unit (200) having dual control programs, and a handset unit (300). The dual bandwidth receiver of the transceiver (100) has different ... | 05/28/1991 |
| 5020093 | Cellular telephone operable on different cellular telephone systems A unique dual-system cellular telephone includes a transceiver (100) having a dual bandwidth receiver, an audio/logic unit (200) having dual control programs, and a handset unit (300). The dual bandwidth receiver of the transceiver (100) has different fil... | 05/28/1991 |
| 5012235 | Paging receiver with continuously tunable antenna and RF amplifier A RF paging receiver which is tunable to channels to receive pages comprising characters to be displayed with the pages being transmitted in a plurality of licensed frequency bands with each band containing a plurality of FM channels in which signal stren... | 04/30/1991 |
| 4926496 | Method and apparatus for infrequent radio users to simply obtain emergency assistance A digital mobile radio transceiver allows even the most unsophisticated user to simply and easily obtain emergency communications. The transceiver is programmed with "personality" data specifying one or more "systems", each "system" specifying one or more... | 05/15/1990 |
| 4896370 | Control system for microprocessor and software enhanced communications equipment A control system for microprocessor and software enhanced land mobile radio communications systems is provided to increase versatility, capabilities and facilities while providing an easier and more precise control of various radio protocols. As the usage... | 01/23/1990 |
| 4802235 | Subscriber unit for a flexible communication system A communication transceiver is described which can permit operation of the transceiver unit in either the trunked dispatch mode or in the cellular mode. The ability to utilize two sets of frequencies with different transmitter channel separation can be ac... | 01/31/1989 |
| 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 |
| 4704735 | System and method for automatic remote activation of an earth-based satellite transmitter A system and method for detecting when a satellite is within range of a small, battery-operated, portable transmitter so as to activate the transmitter only when the satellite is within range of the transmitter. The electronic system utilizes a sensitive ... | 11/03/1987 |
| 4682367 | Mobile radio communications system with join feature Cooperation between two repeater transceivers of a radio trunking system causes a mobile radio transceiver to join or rejoin ongoing communications. To join ongoing communications, a radio transceiver attempts to acquire a free repeater communications cha... | 07/21/1987 |
| 4658435 | Radio trunking system with transceivers and repeaters using special channel acquisition protocol An arrangement for establishing communication between a first mobile radio transceiver and a second mobile radio transceiver through a repeater over a radio frequency channel selected from a plurality of such channels. A repeater distinguishes between two... | 04/14/1987 |
| 4651282 | Microcomputer based keyboard command entry concept for VHF communication and navigation systems Airborne navigation and communication systems are disclosed including a VOR/LOC (VHR Omnirange/Localizer) receiver and a communication transceiver each with separate control and display panels. Each panel includes a ten push-button press keys numbered 0-9... | 03/17/1987 |
