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"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."
Simon Newcomb, astronomer ; Said in 1902, less than two years before the first flight at Kitty Hawk
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| Number | Title | Issue Date |
| 7405663 | System for detecting radio-frequency identification tags Techniques for detecting radio-frequency identification (RFID) tags are disclosed. For example, an exit control system is described that detects unauthorized removal of articles from a protected facility. A series of antennas are setup to produce interrogation corri... | 07/29/2008 |
| 7342374 | Automatic gate operator A barrier movement operator is having a position sensor in a telescoping barrier control arm is described. A controller, remote from the arm, senses the barrier position to identify limits of barrier travel and to control rate of travel of the barrier between limits... | 03/11/2008 |
| 7271677 | Inductive data and power link suitable for integration A system providing an inductive power and data link between an external transmitter and miniature internal receiver is presented. The system is suited to applications where the receiver must be of a small size and the system must consume very little power, such as a... | 09/18/2007 |
| 7117799 | Overhead material handling system and track block The present invention is directed to a material handling system (100) and method (200) for isolating a carrier mechanism (110) from the system. The system (100) comprises a track (103) having a channel (105), a turntable ( | 10/10/2006 |
| 7095316 | Tire pressure monitoring system transmission protocol A system for monitoring conditions within a tire includes a sensor assemblies (14). The sensor assemblies (14) emit a transmission (26) containing information indicative of conditions within a tire to a receiver (16). The transmission ( | 08/22/2006 |
| 6946950 | MOBILE BODY DISCRIMINATION APPARATUS FOR RAPIDLY ACQUIRING RESPECTIVE DATA SETS TRANSMITTED THROUGH MODULATION OF REFLECTED RADIO WAVES BY TRANSPONDERS WHICH ARE WITHIN A COMMUNICATION REGION OF AN INTERROGATOR APPARATUS In a mobile body discrimination apparatus having an interrogator apparatus and a plurality of transponders each capable of transmitting information to the interrogator apparatus by modulation of radio waves that are reflected from a transponder antenna, which can be... | 09/20/2005 |
| 6904134 | Network infrastructure integrated system A network infrastructure integrated system which is able to integrate a telephone line network and a power line network as a single network using a simple circuit includes a first network to which a plurality of Home Information Machines are connected; a second netw... | 06/07/2005 |
| 6611198 | Electronic reader for reading a special characteristic of an object An object identification system and method detects the presence of a target object in a field of inspection and in one aspect of the invention, generates a first signal if the object is left in the field of inspection for more than a minimum threshold per... | 08/26/2003 |
| 6515466 | Phase comparator A phase comparator for calculating the phase difference between a test wave form and an output wave form in a disk drive includes a phase converter, a first multiplier, a first integrator, a second multiplier, a second integrator and a phase angle calcula... | 02/04/2003 |
| 6344797 | Digital electronic locator A digital electronic locator which assists in locating the position and direction of an object/animal/person is described. Three configurations of the locator are presented; the first one is the basic configuration which gives an alerting means (Audio and... | 02/05/2002 |
| 6294981 | Transponder reading device and also control system for controlling the handling of transponder-bearing objects by means of transponder reading devices A transponder reading device and a control system for controlling the handling and/or processing of transponder-bearing objects by such transponder reading devices. The transponder reading device is equipped with its own microcontroller, and with its own ... | 09/25/2001 |
| 6016328 | Method and apparatus for the synchronization of a signal receiving station In an FSK modulated signal receiving station a synchronization sub-system is arranged to sample the received signal and to select one sample per symbol within a detection window having a finite length, said samples being selected at predeterined instants.... | 01/18/2000 |
| 5874903 | RF repeater for automatic meter reading system An automatic meter reading system utilizes repeater technology to access hard to read meters within a fixed network structure. The components of the radio system that are needed for two-way communications are employed without adding significant cost to th... | 02/23/1999 |
| 5832026 | Method for correcting errors from a fading signal in a frequency hopped spread spectrum communcation system A selective call communication system (10) transmits a frequency hopped spread spectrum signal as a Reed Solomon code word modulated as a four-level frequency shift keying (4FSK) signal. A base site transceiver (150) receives the signal on a plurality of ... | 11/03/1998 |
| 5677681 | Code transmission system and portable pager in radio paging system If a code is transmitted at a first transmission rate, a base station modulates the entirety of the code, namely a preamble, a synchronizing signal and a call-data, by two values and transmits them at the first transmission rate. If the code is transmitte... | 10/14/1997 |
| 5661734 | Trellis coded FM digital communications system and method A method and apparatus for encoding and convolutionally decoding a data word of a data word sequence. Each data word has k bits. An encoder selects, using a trellis encoding algorithm and a previous data word, a 2k subset of signal points from ... | 08/26/1997 |
| 5202678 | Recognition unit An electronic recognition unit indicates that a flow of received information is starting when a desired bi-phased pulsed ratio signal starts to be received. The recognition unit discriminates against both noise and spurious radio signals. Desired signals ... | 04/13/1993 |
| 5194858 | Lighting control system with set/reset ground remote A lighting load can be turned on/off manually from one or more remote switching stations as well as from a master switch controller station, with ON/OFF control signals produced at the remote switching stations being transmitted to the master controller c... | 03/16/1993 |
| 5089822 | Interrogation signal processor for air traffic control communications The present invention is directed to a Mode S uplink or interrogation signal demodulation system which can quickly recognize the Mode S signal and also filter out of noise present in the Mode S uplink or interrogation signal, thereby reducing the bit erro... | 02/18/1992 |
| 5056235 | Signal transmission system for machine tools, inspection machines, and the like Probes (18A, 18B, 18C) can be interchangeably mounted in the spindle (12) of a machine tool. Each probe has an optical signal transmission system, in which an optical signal from a light emitting diode (24) is transmitted to a receiving photodiode (26). T... | 10/15/1991 |
| 5043723 | Memory remote control device A memory remote control device which comprises a wave shaping circuit for shaping a received remote-controlled signal and for outputting a pulse signal and an envelope signal, and a microcomputer operable to convert the remote-controlled signal into data ... | 08/27/1991 |
| 5005209 | Process and apparatus for the transmission of selective addresses and/or emergency messages in shortwave radio networks Selective addresses and/or emergency messages are transmitted between individual stations by using a calling signal consisting of a synchronization signal and an address signal (SS and AS) sent out by a transmitter. The address signal (AS) used is a FSK s... | 04/02/1991 |
| 4853686 | Method and apparatus for establishing a connection in shortwave radio networks A connection (link setup) between individual stations of a radio network may be carried out fully automatically, and even with poor transmission quality, only the wanted stations are activated. A call signal includes a synchronization signal having narrow... | 08/01/1989 |
| 4796279 | Subrate preamble decoder for a high speed modem In a communication system, a plurality of remote modems send streams of data to a local modem, each remote modem preceding its transmission with a unique preamble consisting of phase reversed signals. At the local modem a preamble decoder detects the phas... | 01/03/1989 |
| 4755817 | Data transmission system having transmission intervals which are adjustable for data words of various lengths A data transmission system comprising a control unit, a transmitter and a receiver, the transmitter and receiver being connected by a transmission line for the serial transmission of a series of data words in a sequence of subsequent data bits. The contro... | 07/05/1988 |
| 4609922 | Apparatus for controlling and for signal transmission in conveyor installations Transponders are arranged at control locations associated with sections of a track or travel path. Each transponder is in wireless communication through an inductive transmission path and an optical transmission path with a conveyor present in the operabl... | 09/02/1986 |
| 4596022 | FSK data communication system A system for communicating digital data over a limited bandwidth transmission link, including a transition detector for detecting transitions in the binary logic state of an input digital signal and generating a transition indicator signal in response the... | 06/17/1986 |
| 4583090 | Data communication system A data communication system for general purposes having a new ternary carrier frequency shift keying (TCSK) signal. The system is applied to a utility load control by transmission of a sub-carrier of an FM broadcast channel. It is decoded by a receiver, S... | 04/15/1986 |
| 4569060 | FSK Coding method and apparatus involving multiples and submultiples of a given frequency A method for coding a data signal for transmission and reception which includes the steps of generating a prefix signal which is a train of pulses at a multiple or submultiple of a selected baseband frequency, then generating a data stream following said ... | 02/04/1986 |
| 4549178 | Energy control system with transmitter having channel multiplexing and frequency modulation A transmitter circuit adapted to transmit control signals to receivers which in turn activate fluorescent lamp fixtures. The transmitter comprises a frequency controllable oscillator and means coupled from the oscillator for providing alternating cycle co... | 10/22/1985 |
| 4390863 | System for the transmission of binary signals between the components of an alarm system A system for transmission of binary signals between components of an alarm installation and across a transmission path, including an external wire network, comprises a converter for converting each of two logical conditions of two binary signals into resp... | 06/28/1983 |
| 4378526 | Pulse code demodulator for frequency shift keyed data A demodulator which directly decodes Pulse Code Modulated Signals initially modulated by Frequency Shift Keyed Data by determining the period between zero crossings. The instant of the zero crossing between PCM signal samples is determined by interpolatio... | 03/29/1983 |
| 4348669 | Load energizing and de-energizing control system and method A system operates to control the energizing and deenergizing of energy-utilizing loads at facilities remote from each other. A transmitter, remote from each of the facilities, transmits signals carrying a plurality of time multiplexed channels of informat... | 09/07/1982 |
| 4216463 | Programmable digital tone detector A plurality of up/down counters are controlled by a programmed digital reference signal. The combination of a high select signal and a high input signal causes any one of the counters to increment (up) by one count while a combination of a high select sig... | 08/05/1980 |
| 4207474 | Sequential two tone detector A power management central controller is operable to transmit a sequential two tone load shed command to a plurality of power loads should power consumption become excessive. An improved detector at the load site detects the presence of the two tone signa... | 06/10/1980 |
| 4156194 | Frequency-shift-keyed receiver Frequency-shift-keyed signals are detected by a receiver having an input which supplies the received signals to first and second mixers. A local oscillator produces signals at a frequency midway between the two frequencies of the frequency-shift-keyed sig... | 05/22/1979 |
| 4109239 | Radio frequency alarm system including transmitting, coding and decoding circuitry At least one component of a transmitted RF alarm signal is repetitively shifted in frequency between at least first and second frequencies chosen from among a plurality of predetermined frequencies with such shifts in frequency occurring at a predetermine... | 08/22/1978 |
| 4083008 | Method and circuit for generation of digitally frequency-shiftable electric signals A first counter operating as a frequency-shiftable frequency divider is caused to reset before its normal count recycle in one setting of a flip-flop to reduce the factor of frequency division in response to a keying signal. A second counter, operating on... | 04/04/1978 |
| 4064487 | Receiver and decoder A receiver and decoder is disclosed wherein the receiver may be used as a remote control receiver in conjunction with a transmitter transmitting a carrier modulated with an encoded data train of first and second modulation frequencies for first and second... | 12/20/1977 |
| 4057794 | Calling aids A pocket-size portable transmitter in an emergency call transmission system for geriatric persons has an actuator including a simple switch part such as a push button and a simple cover part movable between a normal closed position covering the switch to ... | 11/08/1977 |
