Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 5220557 | Multiple use digital transmitter/transceiver with time multiplexing A digital transmitter/transceiver accommodates multiple simultaneous receiver and transmitter channels by time division multiplexing the tuning and modulation hardware. Only a single digital-to-analog converter is required for multiple channel transmissio... | 06/15/1993 |
| 5216695 | Short pulse microwave source with a high prf and low power drain This invention describes a high voltage, very short pulse, microwave radiating source using low-cost components, and capable of operating at high pulse repetition frequencies (prf). The source is activated by an ordinary video trigger commensurate with dr... | 06/01/1993 |
| 5170414 | Adjustable output level signal transmitter An adjustable output level transmitter includes a direct current energy source, an L-C tank circuit and a switching means for sequentially coupling the capacitors of the tank circuit to the direct current energy source and ground. The output signal freque... | 12/08/1992 |
| 5127024 | Conversion filtering for digital signaling systems One way to increase the bandwidth efficiency of a linear modulation scheme is to increase the number M of possible signaling levels. Such an increase is achieved however at the expense of a smaller minimum distance dmin between the multilevels,... | 06/30/1992 |
| 5079526 | Frequency modulated synthesizer using low frequency offset mixed VCO An improved frequency synthesizer 100 capable of producing true DC frequency modulation without the need to DC frequency modulate the reference oscillator. The synthesizer 100 includes a phase comparator 104 compares the reference signal 102 and the feedb... | 01/07/1992 |
| 5065340 | Coherent gate vesta energy processor A system for the transmission and reception of wide-band real time multi-channel signals for video, audio, facsimile and/or data information, over a single or multiple satellite transponder, or over a carrier of available bandwidth for program distributio... | 11/12/1991 |
| 5029185 | Coded modulation for mobile radio Interleaved block-coded modulation with built-in time diversity is used for fading channel applications. Various modulated block codes of various dimensionalities are disclosed, each built up from an M-DPSK constellation. The signal points making up each ... | 07/02/1991 |
| 4980898 | Self-oscillating burst mode transmitter with integral number of periods A self-oscillating burst mode transmitter transmits an integral number of cycles of a carrier signal in each transmission burst. Each burst commences at a peak value of the carrier signal and terminates at a peak value. The transmitter includes an L-C tan... | 12/25/1990 |
| 4972438 | Self-oscillating transmitter A device for use as a self-oscillating Class D transmitter is disclosed which uses feedback to maintain the oscillation at the resonant frequency of the device, thereby optimizing the efficiency of operation and overcoming the frequency mismatching inhere... | 11/20/1990 |
| 4959843 | Content induced transaction overlap (CITO) block transmitter A CITO communication block transmitter which provides for increased data compression by sorting the entire global data of senders which share a CITO communication channel is disclosed. With this technique, a sender transmits a full block of its data in a ... | 09/25/1990 |
| 4896333 | Circuit for generating a trapezoidal current waveform with matched rise and fall times A transceiver device has a transmitter circuit for transmitting data from a local data terminal to a computer network. The transmitter circuit has a voltage-to-current converter including a voltage divider with a plurality of voltage threshold taps, each ... | 01/23/1990 |
| 4896335 | Digital 2B1Q transmitter with high precision and linearity time domain response A digital 2B1Q transmitter utilizes a dual modulator to generate a 2B1Q coded output by summing two binary modulated vectors in a 2:1 weighting ratio, allowing one modulating envelope generator to drive the dual modulator. The modulating envelope is coded... | 01/23/1990 |
| 4843613 | Digitally implemented modulators A digitally implemented modulator for generating samples of a band-limited modulated output signal from an inputted binary data signal made up of a train of sets of data bits. Samples values are stored in look-up tables incorporated in a microprocessor. T... | 06/27/1989 |
| 4804931 | Digital amplitude modulator - transmitter A digital amplitude modulator for use in transmitting information signals in the context of AM audio and AM video. The amplitude modulator/transmitter basically consists of a predetermined number of quadrature hybrid power devices configured as combiners ... | 02/14/1989 |
| 4788694 | Trellis coding with substrates A succession of (k+n)-bit input words are coded for transmission over a (1 - D) partial response channel by applying n of the bits of each word to a trellis coder which, in turn, selects one of a plurality of 2m cosets from a predefined lattice... | 11/29/1988 |
| 4761798 | Baseband phase modulator apparatus employing digital techniques There is disclosed a Zero IF modulator apparatus for modulating carrier signals with baseband signals, the modulator includes digital logic circuitry including a sine/cosine amplitude converter which is responsive to the baseband signals for providing fir... | 08/02/1988 |
| 4760587 | Device for transmitting high-frequency pulses in a certain pattern and a radio-navigation system including such a device This device comprises a high-frequency signal generator (5) fitted with a modulation control input (10) to supply said pulses at its output in relation to a modulation signal applied to its modulation input and a modulation generator (15) to provide the m... | 07/26/1988 |
| 4682343 | Processing circuit with asymmetry corrector and convolutional encoder for digital data A processing circuit (P) is provided for correcting for input parameter variations, such as data and clock signal asymmetry, phase offset and jitter, noise and signal amplitude, in incoming data signals. An asymmetry corrector circuit (C) performs the cor... | 07/21/1987 |
| 4644345 | Interleaved dual bank encoder There is disclosed an encoder comprising means for generating a plurality of tones with every other tone being in a first bank and the remaining tones being in a second bank. The tones are sequentially combined into a code in which every other tone is fro... | 02/17/1987 |
| 4550416 | Digital transmitter A solid state remote monitoring transmitter which transmits a 40 bit word that contains status information about a transformer via the secondary of a power distribution network to a central receiver associated with the primary (feeder) cable supplying the... | 10/29/1985 |
| 4525847 | QAM encoder This invention describes a QAM encoder which makes use of memory means to generate the desired QAM signals. Each QAM signal corresponds to a group of bits which are defined by an angle on a standard eye-pattern. Each group is passed serially through delay... | 06/25/1985 |
| 4482867 | Microwave power transmitter for doppler radar In a microwave power transmitter for Doppler radars for terrestrial surveillance, use is made of four stages in series comprising first and second preamplifiers, and first and second power amplifiers. These stages are supplied by a group of separate volta... | 11/13/1984 |
| 4471170 | Non-integer programmable counter An I2 L non-integer programmable counter is provided that has a high frequency precision that uses feedback to adjust count length. A first divider adapted to receive a clock signal having a first frequency and an input signal, provide a signal... | 09/11/1984 |
| 4390983 | Digital frequency sender A digital frequency sender comprises a generator which supplies multi-frequency codes by cyclically scanning a table under the control of a time base (BT). The sender comprises a logarithmic generator (GL) which delivers single-frequency signals, a logari... | 06/28/1983 |
| 4387337 | Ground locating device for cathodically protected steel piping and/or electrical conduits The device consists of a transmitter and a receiver. The transmitter utilizes multiple frequencies generated by a binary counter divider and includes a carrier frequency, an I.F. frequency, an audible tone frequency, a frequency which gives the ability to... | 06/07/1983 |
| 4321706 | Frequency modulated phase-locked loop signal source A programmable phase-locked loop frequency synthesizer having a feedback path that includes a tuned discriminator circuit is frequency modulated by coupling a portion of the modulating signal into the feedback path to effect modulation at rates which exce... | 03/23/1982 |
| 4290143 | Transmission method and apparatus wherein binary data bits are converted into barker words and vice versa A binary encoded data transmission system wherein a binary data bit of a first value is represented by a first predetermined multi-bit binary Barker word and a binary data bit of a second value is represented by a second multi-bit binary Barker word, the ... | 09/15/1981 |
| 4271510 | Shift-register transmitter for use in a high speed, low noise digital data communication system Shift-register transmitting means for use in a serial type data transmission channel employing a plurality of coaxial lines for communicating digital data from the transmitting means to a receiving means. The transmitter means comprises a plurality of shi... | 06/02/1981 |
| 4241419 | Asynchronous digital data transmission system A transmission system is disclosed for transmitting asynchronous binary signals from a source to a selected utilization device without requiring a system clock common to the source and utilization device. The system includes apparatus for converting the a... | 12/23/1980 |
| 4218655 | Method and apparatus for transmitting intelligence over a carrier wave A method and apparatus for transmitting intelligence over a carrier wave are disclosed in which a signal waveform is added to a carrier wave to produce a composite wave having a recognizable pattern of variations in intervals that are defined by preselect... | 08/19/1980 |
| 4160209 | Resonant circuit excitation method and apparatus A method and apparatus using a single-frequency oscillator as a source for resonating, selectively, an infinite number of different higher-frequency resonant circuits. The oscillator signal is clipped, and this clipped signal is processed in an infinitely... | 07/03/1979 |
| 4157540 | Wireless alarm system The wireless alarm system comprises a portable wireless transmitter assembly adapted to be concealed on the person, a radio receiver and signal decoder for receiving a coded wireless signal transmitted by the radio transmitter, an adjustable timer and sig... | 06/05/1979 |
| 4144543 | Predictive codec capable of selecting one of at least three prediction signals in two steps A predictive encoder produces a prediction error signal in response to an autocorrelated signal, such as a television broadcast signal. The encoder includes a prediction signal producing circuit for producing several prediction signals for each sample ele... | 03/13/1979 |
| 4142184 | Digital multitone generator for telephone dialing A digital signal generator that produces multi-frequency tones in the voice band range for use in telephone station sets utilizing multitone dialing. Amplitude information describing each of eight voice band frequencies is digitally encoded into a sequenc... | 02/27/1979 |
| 4136258 | Transition encoding apparatus Apparatus for encoding isochronous data into a digital format wherein the output encoded word represents a digital number indicative of the time between a frame pulse and the first transition of incoming data, provides a logic level bit indicative of the ... | 01/23/1979 |
| 4134108 | Emergency alarm device A portable and addressable emergency alarm device which transmits a selected radio frequency alarm signal from a portable transmitter to a stationary receiver and sounds an alarm.... | 01/09/1979 |
| 4104638 | Cooperative type anti-collision radio system A cooperative type aircraft anti-collision radio system utilizes radio transmitters and receivers transmitting and receiving on a single radio frequency common to most aircraft having radio systems or on multiple radio frequencies if desired. Each aircraf... | 08/01/1978 |
| 4084069 | Encoding and driving means for use in a three-level digital data communication system Improved encoding and driving means for use in a direct-coupled, three-level binary serial digital data transmission channel. The binary data to be transmitted is encoded into a three-level signal requiring only one transition per bit. A three-state balan... | 04/11/1978 |
| 4066841 | Data transmitting systems It is important that a data transmission system should be fast, utilize a minimum of band width and be accurate in the presence of high noise levels. The invention provides a frequency shift keying data transmission system for transmission of binary coded... | 01/03/1978 |
| 4066965 | RF GTWT Saturating circuit A circuit to control the RF drive to a gridded traveling wave tube (GTWT) to operate the tube in saturation across the entire RF band and at all PRF's and pulse widths. Control is attained by sensing the GTWT output and using a feedback circuit to vary an... | 01/03/1978 |
