Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 5100745 | Method for rejuvenating Ni-H2 batteries A method for rejuvenating Ni-H2 battery cells suffering a voltage anomaly providing an improved cell output voltage and capacity. After the battery containing the cells suffering the voltage anomaly is removed from service, the battery is disch... | 03/31/1992 |
| 5005019 | Electromagnetically coupled printed-circuit antennas having patches or slots capacitively coupled to feedlines A printed-circuit antenna array having broadband linear polarization, and circular polarization with high polarization purity, feedlines of the array being capacitively coupled to feeding elements at a single feedpoint or at multiple feedpoints, the feedi... | 04/02/1991 |
| 4987386 | Coherent phase and frequency recovery method and circuit A coherent phase and frequency recovery method capable of rapidly recovering the phase and frequency of bursts of received signals from plural sources. The received signal is applied to a first input of a mixer, the output of which is amplified and applie... | 01/22/1991 |
| 4970592 | Horizontal synchronization, clock synchronization, D.C. restoration and gain control scheme for an analog TV system An analog TV system includes a transmitter which produces a horizontal unique pulse sequence during each horizontal blanking interval. The pulse sequence is amplitude modulated between two levels to define a horizontal unique word for horizontal synchroni... | 11/13/1990 |
| 4967272 | Bandwidth reduction and multiplexing of multiple component TV signals In a system for transmitting analog video signals, the luminance and chrominance components are each subjected to different bandwidth reduction processes. In addition, the high and low frequency portions of the luminance component are subjected to differe... | 10/30/1990 |
| 4943809 | Electromagnetically coupled microstrip antennas having feeding patches capacitively coupled to feedlines A microstrip antenna array having broadband linear polarization, and circular polarization with high polarization purity, feedlines of the array being capacitively coupled to feeding patches at a single feedpoint or at multiple feedpoints, the feeding pat... | 07/24/1990 |
| 4929959 | Dual-polarized printed circuit antenna having its elements capacitively coupled to feedlines A printed-circuit antenna enabling two signals to be received simultaneously. Two layers of radiating elements and corresponding power dividers are provided, one set of power dividers being disposed orthogonally with respect to the other, so as to enable ... | 05/29/1990 |
| 4926189 | High-gain single- and dual-polarized antennas employing gridded printed-circuit elements A gridded radiating element for printed circuit antennas employing capacitive coupling of radiating elements to feedlines. The radiating element is formed of a grid wherein a metallization region is etched selectively to yield a plurality of metal strips ... | 05/15/1990 |
| 4912765 | Voice band data rate detector An apparatus for detecting the modulation rate of voice-band data signals. The detector determines the level occupancy Lp, the partial entropy Ep, and the zero-crossing count Nzc for the input signal and compares these val... | 03/27/1990 |
| 4901349 | Time dispersal encryption of TV signals In encrypting a video signal for communications security, the horizontal synchronization pulses are removed, the active signal portions of each line in a field are delayed according to psuedorandom sequence of delays, and the reference color burst is move... | 02/13/1990 |
| 4868886 | Combined global/spot beam configuration for satellite communications In antenna arrays having normally unexcited or little-excited elements, a technique for configuring the array to provide both global and spot beam coverage, wherein the normally unexcited or little-excited elements are excited at a higher level, together ... | 09/19/1989 |
| 4866451 | Broadband circular polarization arrangement for microstrip array antenna The invention relates to a circular polarization (CP) technique and a microstrip array antenna implementing this technique. Using four microstrip radiating elements with proper phasing of the excitation in a 2×2 array configuration, the technique average... | 09/12/1989 |
| 4849998 | Rate synchronized symbol timing recovery for variable rate data transmission systems A symbol timing recovery circuit with a clock synchronization loop for variable rate data signals utilizes a frequency synthesizer for setting the frequency of the recovered clock signal. The received data signal, representing the modulating waveform of a... | 07/18/1989 |
| 4829377 | Horizontal synchronization, clock synchronization, D. C. restoration and gain control scheme for an analog TV system An analog TV system includes a transmitter which produces a horizontal unique pulse sequence during each horizontal blanking interval. The pulse sequence is amplitude modulated between two levels to define a horizontal unique word for horizontal synchroni... | 05/09/1989 |
| 4815130 | Stream cipher system with feedback A cipher system in which a key is initially inserted into a shift register and the serial output of the shift register is added to the plain text message and the sum is fed back into the serial input of the shift register. Parallel outputs of the shift re... | 03/21/1989 |
| 4811394 | Variable starting state scrambling circuit PN sequence generators used in the scrambling and descrambling circuits at remote locations are periodically preset to the same value in order to maintain synchronism, with the preset value being also periodically changed. The preset value can be transmit... | 03/07/1989 |
| 4809334 | Method for detection and correction of errors in speech pitch period estimates A method of detecting and correcting received values of a pitch period estimate of a speech signal for use in a speech coder or the like. An average is calculated of the nonzero values of received pitch period estimate since the previous reset. If a curre... | 02/28/1989 |
| 4797918 | Subscription control for television programming A method and apparatus for one-way subscription television service control which allows the subscribers to subscribe in advance to a variety of programming or to select programming oa a pay-per-view basis.... | 01/10/1989 |
| 4792963 | Satellite clock system A satellite clock system in which the frequency of the onboard satellite clock, which is implemented as a relatively high uncertainty voltage-controlled oscillator, is corrected in accordance with a high-stability, low-uncertainty terrestrial clock. Meter... | 12/20/1988 |
| 4776540 | Method of orienting a synchronous satellite The invention is a method of orienting a satellite in a geosynchronous orbit so as to direct a beam from an antenna mounted on the satellite to cover a desired target site, and pointing the beam axis at a desired bore site target. One embodiment of the me... | 10/11/1988 |
| 4774705 | Switch matrix with acoustic delay for TDMA signal storage on-board a satellite A switch matrix with a delay feature for temporary storage of burst communications on-board a satellite. Additional input and output ports are added to a conventional switch matrix in such a manner that, if delay is desired, the additional output ports lo... | 09/27/1988 |
| 4761654 | Electromagnetically coupled microstrip antennas having feeding patches capacitively coupled to feedlines A microstrip antenna array having broadband linear polarization, and circular polarization with high polarization purity, feedlines of the array being capacitively coupled to feeding patches at a single feedpoint or at multiple feedpoints, the feeding pat... | 08/02/1988 |
| 4645883 | Double talk and line noise detector for a echo canceller An echo canceller comprising an adaptive finite impulse response filter receiving a receive signal and having its output subtracted from a send signal, a non-linear device for attenuating low level signals of the send signal and a noise injector for injec... | 02/24/1987 |
| 4637017 | Monitoring of input backoff in time division multiple access communication satellites A method of measuring input-backoff to an amplifier in a time-division multiple access (TDMA) communication system having a carrier recovery segment and a clock recovery segment prior to a data segment in a traffic burst. A monitoring station transmits a ... | 01/13/1987 |
| 4636753 | General technique for the integration of MIC/MMIC'S with waveguides A technique for packaging and integrating of a microwave integrated circuit (MIC) or monolithic microwave integrated circuit (MMIC) with a waveguide uses a printed conductive circuit pattern on a dielectric substrate to transform impedance and mode of pro... | 01/13/1987 |
| 4620224 | Video scrambling technique for multiplexed analog component formats A method for scrambling a television signal for use with a multiplexed analog component (MAC) format employs a three digital bit code for each horizontal line of the picture. The bits identify the position of the luminance and chrominance information of t... | 10/28/1986 |
| 4609787 | Echo canceller with extended frequency range An echo canceller with extended frequency range for acoustic echoes comprising an adaptive finite impulse response filter receiving the receive signal below a cross-over frequency and predicting the echo of this signal across the echo path, a subtractor f... | 09/02/1986 |
| 4602965 | Method of making FETs in GaAs by dual species implantation of silicon and boron A method of preparing an active surface layer on a semi-insulating GaAs substrate comprising the steps of ion implanting a surface layer with silicon to form an n-type active layer and ion implanting a buried diffusion layer beneath the active layer with ... | 07/29/1986 |
| 4602375 | Onboard clock correction by means of drift prediction In an on-board satellite clock correction system of the type wherein phase errors between the satellite clock and a ground-based clock are determined and a clock correction value sent to the satellite, the clock correction value is determined by curve-fit... | 07/22/1986 |
| 4600815 | Automatic gain control for echo cancellers and similar adaptive systems An echo canceller for a teleconferencing device is herein disclosed in which a first attenuator limits the dynamic range of a composite speech-echo input signal. A second attenuator, having a gain equal to that of the first attenuator, alters the gain of ... | 07/15/1986 |
| 4595929 | Scheme for aberration correction in scanning or multiple beam confocal antenna system A frequency conversion interface is disposed between the main and subreflectors in a multiple beam antenna system so that the antenna system amplification factor will be defined by m=(f1 /f2).multidot.(ω1 /ω2)... | 06/17/1986 |
| 4591812 | Coplanar waveguide quadrature hybrid having symmetrical coupling conductors for eliminating spurious modes A coplanar waveguide quadrature hybrid is herein disclosed which produces even E-field symmetry about the center line of transmission during both even-and odd-mode excitation. In a first embodiment of the present invention, a first coupling element of a g... | 05/27/1986 |
| 4585711 | Hydrogen electrode for a fuel cell A hydrogen electrode and the method of making the electrodes usable in a fuel cell comprising a perforated nickel foil current collector, the back side of which is sealed with a semi-permeable membrane of polytetrafluoroethylene (PTFE) with a thickness of... | 04/29/1986 |
| 4583078 | Serial Viterbi decoder A serial Viterbi decoder in which a single set of circuits is sequentially used for all the encoder states to calculate the maximum probability path, as measured against received signals, of unencoded signal sequences to reach each encoder state. The path... | 04/15/1986 |
| 4581736 | Multiple downlink data aggregator and system In a TDMA satellite communications system with a plurality of transponders and a network of satellite communication controller (SCC) terminals, a data aggregator which may be attached to a local SCC. The data aggregator simultaneously receives TDMA frames... | 04/08/1986 |
| 4519080 | Analog threshold decoder A modified Type I decoder generates analog syndrome bits from a selected combination of analog signals representing bits yet to be decoded and digital signals representing already decoded information bits. A selected combination of analog syndrome bits is... | 05/21/1985 |
| 4501001 | Variable slope delta coding processor using adaptive prediction A variable slope delta coding processor using adaptive prediction in which a digitized signal is transmitted with approximately half the channel bandwidth required by previous techniques without any substantial sacrifice of received signal quality. An est... | 02/19/1985 |
| 4500856 | Simplified minimum shift keying modulator An MSK modulator having a simple construction with only a single necessary adjustment. The digital bit stream to be modulated is fed directly to the control input of a 0,π phase shifter in a single-sideband modulator. A phase shift circuit is used to cou... | 02/19/1985 |
| 4500842 | Adaptive gain variable bit rate NIC processor An adaptive gain control is provided at the input of a Variable Rate Nearly Instantaneous Companding (VRNIC) processor to adjust the gain of low level speech signals so that the transmission bit rate and SNR will remain substantially the same for low sign... | 02/19/1985 |
| 4484027 | Security system for SSTV encryption In a secure communications system, a key number which is changed periodically, e.g. monthly, and a random number from a random number generator are combined and used as a seed to reset a PN sequence generator, with the output of the generator being used t... | 11/20/1984 |
