Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 7283012 | Tri-state pulse density modulator A tri-state pulse density modulator includes a first switch device coupled to a high voltage, and a second switch device coupled to a low voltage. An adder receives a pulse density modulation (PDM) input signal and a latched input signal to generate an output sum si... | 10/16/2007 |
| 7274754 | Method and apparatus for frequency division multiplexing A radio transmitter and receiver arrangement includes a transmitter and a receiver. The transmitter generates an electromagnetic carrier that varies in frequency throughout a channel interval, and modulates the carrier with an information signal during the channel i... | 09/25/2007 |
| 6242988 | Spiking neuron circuit A spiking neuron circuit providing a spiking output signal in response to an input current that causes a first capacitor to charge to a threshold voltage. In response to achieving such threshold, an output terminal is connected to a voltage, illustrativel... | 06/05/2001 |
| 5623233 | Pulsed optically injection locked MESFET oscillator An optically controlled MESFET semiconductor oscillator assembly having a MESFET semiconductor which, when voltage biased by a pulsed dc voltage, oscillates at a free running frequency; an optical signal delivery system, such as a light intensity modulato... | 04/22/1997 |
| 5410276 | RF modulation using a pulsed DC power supply Circuits for modulating an RF input signal applied to an RF high power amplifier to produce a modulated RF output signal. The present invention employs a VHF power supply or converter with a modulation control circuit that enables the power supply to be p... | 04/25/1995 |
| 5038051 | Solid state modulator for microwave transmitters A switching modulator for a microwave radar transmitter is presented. In embodiment, a string of series connected transistors is controlled from an external source for pulse modulating the cathodes of transmitter microwave tubes. The individual componen... | 08/06/1991 |
| 4755773 | Phase modulator apparatus for generating a burst phase-modulated wave A time division communication system tends to develop noise responsive to variations of the output of the voltage supply which occur as the time slot signals switch on or off to thereby vary the load demand placed upon the power supply. The invention elim... | 07/05/1988 |
| 4683446 | PRF coherent, pulsed oscillator apparatus Phase locked, pulsed oscillator apparatus, for example, for radar use, comprises a pulsed r.f. oscillator, a pulse repetition frequency (PRF) generator and a pulse shaping network. The PRF generator pulsed output signal of frequency, f1, is res... | 07/28/1987 |
| 4529950 | Digital phase and amplitude modulator A digital phase and amplitude modulator with a code conversion circuit having several digital inputs able to receive digital data and the same number of outputs supplying code converted digital data, a generator of at least one carrier having at least one... | 07/16/1985 |
| 4516086 | Frequency modulator for the transmission of analog data A modulator transmitting an analog data signal by variation of the frequency of an oscillator comprising an integrator (1, 2) and a bistable circuit with trigger hysteresis (8 to 13). The two-level voltage from the bistable circuit, taken to a terminal of... | 05/07/1985 |
| 4435734 | FM Video recording and reproducing system High resolution video signals of bandwidth up to 25 mHz are recorded magnetically or optically, or are transmitted on a communications channel carrier with superior fidelity by using novel electronic circuit system including implementations of an FM modul... | 03/06/1984 |
| 4380746 | Pulse modulator using capacitor charging and discharging circuits A self-starting, non-latching, pulse modulator which will function as an analog divider of first and second input quantities, or as a linear pulse period modulator responsive to one of the quantities, or as a linear pulse frequency modulator responsive to... | 04/19/1983 |
| 4319204 | Phase modulated square wave generator A pair of square waves of a carrier frequency are applied respectively to a pair of amplifier circuits having a common output circuit. The output circuit is connected so that the energy therein is dependent upon the relative phases of the square waves. A ... | 03/09/1982 |
| 4253071 | Phase modulator circuit A problem with phase modulators particularly when modulating high frequency signals with signals of audio frequency is that noise is generated during the production of a free running ramp signal and noise is present on the modulating signal so that accura... | 02/24/1981 |
| 4083019 | Current controlled emitter coupled multivibrator A multivibrator circuit has a main constant current source through which the main portion of the current of the multivibrator circuit is supplied and a by-pass current source through which a portion of the current to be supplied to the main constant curre... | 04/04/1978 |
