Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7348859 | Crystal oscillator A crystal oscillator that outputs an oscillation output signal of an oscillator circuit oscillated by a crystal resonator as a resonation source via a buffer circuit, includes: a plurality of waveform output circuits provided in the buffer circuit, each converting, ... | 03/25/2008 |
| 7342463 | Timer circuits and method A timing circuit operates by applying an arbitrary voltage across a resistance, and using the resulting current to generate a charging current which charges and/or discharges a capacitance to an endpoint voltage. Additional circuitry is arranged such that the capaci... | 03/11/2008 |
| 7167062 | Oscillator circuit and oscillator biasing method An oscillator circuit with an oscillator device. The oscillator device has a oscillator bias contact (Vcm). A bias source (Vbias) is connected to said oscillator contact with a source contact. The voltage source includes a varying bias source which in use provides a... | 01/23/2007 |
| 7111187 | Information processor and information processing system utilizing interface for synchronizing clock signal An information processing system having an original clock oscillator for delivering at least one original clock signal K defined as a first clock signal and a plurality of information processing units supplied with the original clock signal K, wherein each informati... | 09/19/2006 |
| 7002422 | Current-mirrored crystal-oscillator circuit without feedback to reduce power consumption An oscillator inverter circuit has an input at a first crystal node and drives a second crystal node of a crystal oscillator. The first node is lightly loaded by a gate of an input transistor that generates a buffered node. The buffered node voltage is converted to ... | 02/21/2006 |
| 6925426 | Process for high fidelity sound recording and reproduction of musical sound A local performance simulation system simulates an ensemble sound pattern. The simulation system includes a signal generation system for simultaneously generating contact recording signals based on vibrations from the ensemble, where the ensemble produces an ensembl... | 08/02/2005 |
| 6741138 | Multiple output crystal oscillator The present invention relates to a multiple output crystal oscillator having a plurality of output terminals for implementing multiple output and Integrated Circuit (IC) chips. More particularly, the crystal oscillator comprises a crystal resonator, a first IC chip ... | 05/25/2004 |
| 6320431 | Apparatus and method of generating numerically controlled oscillator signals An apparatus according to a preferred embodiment of the present invention includes two memories each storing different octants of a sine (or cosine) waveform. The sine and cosine waveforms may be concurrently generated by alternately accessing each memory... | 11/20/2001 |
| 5592128 | Oscillator for generating a varying amplitude feed forward PFC modulation ramp An oscillator for generating a varying amplitude feed forward power factor correction (PFC) modulation ramp signal includes a clock generating circuit and a ramp generating circuit. The PFC ramp signal generated by the ramp generating circuit is used with... | 01/07/1997 |
| 5113153 | High-frequency monolithic oscillator structure for third-overtone crystals A crystal oscillator circuit wherein first and second transistors are connected to form a differential pair. The second transistor functions as an inverting gain stage for the oscillator and two capacitors are provided to complete a feedback path in serie... | 05/12/1992 |
| 5017890 | Phase-controllable oscillator A phase-controllable oscillator consists of a capacitance and an apparatus for charging and an apparatus for discharging the capacitance. In addition, feedback is provided for activating the charging and discharging apparatus in dependence on the oscillat... | 05/21/1991 |
| 4450415 | Alterable mode oscillator An integrated circuit includes provision for connecting to a discrete capacitor, a charger current-mirror circuit for charging the capacitor and a discharger current-mirror circuit for discharging the capacitor. A constant current source is alternately sw... | 05/22/1984 |
| 4152670 | Signal generator, especially for ringing current in telecommunication system A circuit arrangement for feeding a sinusoidal signal current to a wide range of loads, such as ringing current transmitted over subscriber lines from a telephone exchange, comprises a modulator which converts a rectified sine wave into a sequence of unip... | 05/01/1979 |
| 4039968 | Synchronizing circuit A circuit for synchronizing a microwave oscillator with a reference source of known frequency. The synchronizing circuit includes a phase-lock loop which compares the output of a free-running, crystal-controlled, voltage-controlled oscillator with the out... | 08/02/1977 |
| 3992680 | Precision test frequency generator A precision test frequency generator capable of selectively providing a sinusoidal output wave within a frequency range simulating the output of a flowmeter yielding a sinusoidal signal whose frequency is proportional to flow rate, the signal having a noi... | 11/16/1976 |
| 3979693 | Crystal-controlled oscillator having sinusoidal and square-wave output signals A precision crystal-controlled oscillator circuit with provision for separate sinusoidal and square-wave output signals which can be realized as a silicon integrated circuit without the use of external capacitors or resistors is disclosed. Two feedback lo... | 09/07/1976 |
