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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 |
| 7928808 | Selectable local oscillator A selectable local oscillator provides an output frequency signal having a selectable frequency within a desired output frequency range. The selectable local oscillator comprises first, second and third signal generators configured to provide first, second and third... | 04/19/2011 |
| 7321268 | Ultra wideband and fast hopping frequency synthesizer for MB-OFDM wireless application A frequency synthesizer with a single PLL and multiple SSB mixers is presented. The frequency synthesizer includes a single PLL outputting a reference signal that is fed to a plurality of dividers coupled in sequence. The outputs from the dividers are mixed by the S... | 01/22/2008 |
| 7299006 | Adaptive radio transceiver An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 11/20/2007 |
| 7136622 | Adaptive radio transceiver with noise suppression An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 11/14/2006 |
| 7031668 | Adaptive radio transceiver with a local oscillator An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 04/18/2006 |
| 6975838 | Adaptive radio transceiver with noise suppression An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 12/13/2005 |
| 6970496 | RF modem and communications transceiver utilizing saw device and pulse shaping A bidirectional direct sequence spread spectrum half-duplex RF modem that can be applied to transmit and receive numerous types of analog and digital pulse modulation. The modem incorporates a SAW based correlator for performing the spreading and de-spreading functi... | 11/29/2005 |
| 6961546 | Adaptive radio transceiver with offset PLL with subsampling mixers An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 11/01/2005 |
| 5847612 | Interference-free broadband television tuner An interference free local oscillator circuit is disclosed. A first local oscillator signal is generated in a first phase locked loop. A second local oscillator signal is generated in a second phase locked loop. Third and fourth phase locked loops provide... | 12/08/1998 |
| 5748047 | Microwave frequency generator and method of generating a desired microwave frequency signal A microwave frequency generator and method of generating a predetermined microwave signal. The invention comprises oscillator means to generate a determinable frequency signal and means responsive to the frequency signal received from the oscillator means... | 05/05/1998 |
| 5598130 | Phase modulator capable of individually defining modulation degree and modulation frequency An FM signal generator generates an FM signal obtained by frequency-modulating a reference frequency signal with a modulating frequency signal. A first mixer mixes the FM signal and an input signal having a predetermined carrier frequency and outputs a pa... | 01/28/1997 |
| 5519359 | Microwave oscillator with loop frequency conversion to and signal amplification at an intermediate frequency A microwave oscillator with loop frequency conversion to and signal amplification at an intermediate frequency. A high-Q sapphire dielectric resonator is coupled in a frequency conversion loop between a pair of balanced mixers. One mixer comprises a downc... | 05/21/1996 |
| 4916411 | Variable frequency jitter generator A circuit for generating jitter includes a mixer which mixes a jittered signal from a jitter generator with the output of a variable frequency oscillator to produce a broadband jittered output. A preferred form of the circuit uses a double frequency trans... | 04/10/1990 |
| 4626787 | Application of the phaselock loop to frequency synthesis A frequency synthesizer is disclosed having n identical digital module stages, each of which stages generates one digit of the final frequency number of the synthesized frequency output signal. Each digit module stage comprises a series arrangement of a p... | 12/02/1986 |
| 4475090 | Noise generator having variable bandwidth and center frequency A noise source is coupled through a first bandpass filter to a first mixer to which a first local oscillator signal is applied. The output of the first mixer is coupled through a second bandpass filter to a second mixer to which a second local oscillator ... | 10/02/1984 |
| 4425552 | Direct-type binary frequency synthesizer An apparatus including means for providing at least five fixed internal frequency signals having five different values of frequencies in which all of said frequencies are coupled into a first processor stage comprised of a single pole double throw switch ... | 01/10/1984 |
| 4245193 | High-Q multi-mode resonator controlled source An oscillation control circuit in which the output of an unstabilized oscillator is controlled using a bulk acoustic wave resonator. The circuit includes a high and low frequency loop with the power output of the oscillator being divided and supplied alon... | 01/13/1981 |
| 4100504 | Band rejection filter having integrated impedance inverter-tune cavity configuration For eliminating an unwanted leaking local oscillator signal from the output of a double-balanced mixer circuit in a microwave frequency up-converter, a band rejection filter formed of series connected impedance inverter elements and a plurality of tuned c... | 07/11/1978 |
| 3974457 | Time and frequency control unit The present invention relates to a time and frequency control unit which is apable of compensating for long-term crystal oscillator drift and other errors in a reference oscillator signal by both coarse and fine (vernier) controlling. The invention takes t... | 08/10/1976 |
