Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 7724098 | Gyromagnetic precession oscillator The present invention is, in one aspect, a radio frequency source, comprising a gyromagnetic precession oscillator. In a second aspect, the gyromagnetic precession oscillator comprises a closed, non-magnetic, cylindrical outer conductor defining a cavity therein; an... | 05/25/2010 |
| 7541883 | Coaxial resonator based voltage controlled oscillator/phased locked loop synthesizer module A synthesizer module/oscillator assembly includes a voltage controlled oscillator with a coaxial resonator. In one embodiment, the module measures 20.3 mm×14.8 mm×3.9 mm and the coaxial resonator is positioned on the circuit board of the module between a phase loc... | 06/02/2009 |
| 7210755 | Solid semiconductor element, ink tank, ink jet recording apparatus provided with ink tank, liquid information acquiring method and liquid physical property change discriminating method There is disclosed a solid semiconductor element which very efficiently detects information about a liquid and bidirectionally exchanges the information with the outside. The solid semiconductor element is disposed in a liquid container, and includes at least energy... | 05/01/2007 |
| 7030718 | Apparatus and method for extending tuning range of electro-acoustic film resonators A tuning circuit for adjusting an oscillation frequency of an oscillator circuit. The tuning circuit comprises a film bulk acoustic wave resonator (FBAR) having a series resonance frequency and a parallel resonance frequency, and an inductor coupled in series or par... | 04/18/2006 |
| 6859118 | System and method for an ultra low noise micro-wave coaxial resonator oscillator using ⅝ths wavelength resonator A system and method for a novel microwave coaxial resonator oscillator using a ⅝ths wavelength resonator is described. The novel system and method provides a coaxial resonator for operation at high frequencies comprising a conductive resonator and a coaxial conduc... | 02/22/2005 |
| 6768266 | Microwave pulse generator incorporating a pulse compressor A pulse generator includes a microwave source that delivers a pulsed signal into a resonant compression cavity equipped with a switching device for opening or closing the resonant compression cavity. The pulsed signal is stored in the resonant compression cavity whe... | 07/27/2004 |
| 6338105 | Data transmission method and game system constructed by using the method To provide a new data transmission system between a game device and related peripheral devices, and a device using same. Serial transmission data is divided into an odd-numbered bit sequence and an even-numbered bit sequence. Each bit of the odd-numbered bit s... | 01/08/2002 |
| 6297704 | Oscillation circuits featuring coaxial resonators There is a manufacturing limit on how small ceramic coaxial resonators can be produced, which leads to a limit on the frequency of resonance for these resonators. One technique to quadruple the effective frequency of a ceramic coaxial resonator is to coup... | 10/02/2001 |
| 6275118 | Push-push oscillator A push--push oscillator is formed by (a) a resonator circuit including a transmission line having one-half wavelength and both ends of the line being left open, and a capacitance for frequency control coupled to the transmission line in parallel, and (b) ... | 08/14/2001 |
| 6232843 | Plural coupled microwave oscillators providing phase shifted output signals A signal generator for producing a plurality of signals having the same frequency but a constant phase difference includes first and second cavity oscillators coupled to each other via an appropriate wall and coupling apertures. A first output signal is e... | 05/15/2001 |
| 6147563 | Coupled cavity oscillator producing output signals with a constant phase difference An improved method and system for generating quadrature phase shift keying signals for use in data transmission is provided. A pair of oscillators are slaved to the transmit frequency and produce two quadrature signal components with the same frequency bu... | 11/14/2000 |
| 5714913 | Discrete monotron oscillator having one-half wavelength coaxial resonator with one-quarter wavelength gap spacing A discrete monotron oscillator for use in a high power microwave device is formed with a microwave oscillator having a half-wavelength resonant coaxial microwave cavity operating in fundamental TEM mode for microwave oscillation with an inner conductor de... | 02/03/1998 |
| 5691670 | Integrated microwave-silicon component The circuit employs two bipolar transistors, five resistors and a capacitor and can be primarily utilized as a broadband pre-amplifier and also as an oscillator or a mixer. A first transistor is connected to the circuit input and ground. A second transist... | 11/25/1997 |
| 5508665 | Oscillator operable in a high impedance mode An oscillator arranged to operate at an oscillation frequency includes a resonant structure 137, preferably a coaxial resonator, selected to resonate at a frequency, and an impedance 210, preferably a transistor 101 based common collector circuit, paralle... | 04/16/1996 |
| 5130673 | Varactor tuned coax resonator A broadband, varactor-tuned shorted coax resonator is provided with a single point coupling port that facilitates coupling of discrete circuitry to the distributed resonator to form an oscillator. The coupling port is defined by adding a second shorted co... | 07/14/1992 |
| 5045825 | Coupling port for multiple capacitor, distributed inductor resonator A broadband, varactor-tuned shorted coax resonator is provided with a single point coupling port that facilitates coupling of discrete circuitry to the distributed resonator. The coupling port is defined by adding a second shorted coax line across the end... | 09/03/1991 |
| 4668924 | Free electron diode oscillator A crossed-field microwave power tube. Electrons are emitted from a tubular lectrode at ground potential. The electrons are accelerated by an electric field toward a high voltage anode located within the tubular electrode. A magnetic field is oriented along... | 05/26/1987 |
| 4623849 | Broadband high power IMPATT amplifier circuit An IMPATT diode mounted in a double-tuned resonant cavity to exhibit stability by suppressing subharmonic frequencies is disclosed. A foreshortened quarter wavelength section is connected to the diode to form an equivalent parallel resonant circuit at one... | 11/18/1986 |
| 4588963 | Microwave power combiner with alternating diode modules A solid state microwave power combiner is disclosed having a central combining cavity with a plurality of coaxial oscillator circuits disposed about and coupled to the cavity. The oscillator circuits are oriented such that their longitudinal axes are para... | 05/13/1986 |
| 4571525 | Resonant coaxial cavities for a grid vacuum tube The means providing capacitive decoupling between the inside cylinder and a grid electrode are disposed at about one fourth of the wavelength of the highest operating frequency from the tube end of the inside cylinder. This is a current node, and dielectr... | 02/18/1986 |
| 4521747 | Suspended stripline varactor-tuned Gunn oscillator Improved output power performance is obtained in a millimeter-wave integrated-circuit (MIC) voltage-controlled oscillator by forming an output circuit and a bias input circuit in a suspended stripline configuration, which is subject to relatively low loss... | 06/04/1985 |
| 4504801 | Microwave power generator with dual coaxial lines connected to transistor A small size and light weight microwave power generating apparatus in which a power MOS FET which can withstand a high voltage and large current is combined with a microwave transmission circuit having a drain side coaxial resonating system having an inte... | 03/12/1985 |
| 4491806 | Resonant cavity with integrated microphonic suppression means The invention is a microphonics suppression means for a high frequency resonant cavity. The resonant cavity is used in a RF oscillator to generate UHF/VHF frequencies. The resonant cavity comprises an outer wall portion, a center conductor portion, a tuni... | 01/01/1985 |
| 4482871 | Wideband VCO including variable capacitive output coupling varactor for constant power output A wideband VCO including a coaxial cavity with a negative impedance semiconductor diode and a tuning varactor mounted in a center conductor thereof. A variable bias circuit connected to the tuning varactor for tuning the VCO through a predetermined range.... | 11/13/1984 |
| 4471325 | Power combiner with reentrant coaxial diode oscillators An improved combiner of microwave power out of a plurality of coaxial diode oscillators is shown to be made up of a circular cylindrical cavity dimensioned to operate in the TM020 mode at a selected microwave frequency, with such oscillators be... | 09/11/1984 |
| 4470021 | Power combiner for coaxial diode oscillators A power combiner using a circularly cylindrical cavity, dimensioned to support the TM020 mode, to combine the power from coaxial diode oscillators is shown to comprise: (a) a first plurality of such oscillators disposed about the periphery of s... | 09/04/1984 |
| 4468633 | Adjustable microwave power combiner for a plurality of coaxially mounted impatt diodes A typical coaxial circuit which couples a negative resistance diode to the cavity of a power combiner consists of a metallic rod which is biased by a spring against the diode supported by a carrier which is effective to vary the position of the diode alon... | 08/28/1984 |
| 4429287 | Coaxially coupled tunable oscillator using a ridge waveguide A source of microwave-frequency electromagnetic energy of a specific desired frequency is generated by a device that utilizes a filter network to absorb energy of unwanted frequencies and couples energy of the desired frequency into a tunable ridge wavegu... | 01/31/1984 |
| 4283689 | Microwave oscillator circuit with improved efficiency A microwave oscillator circuit, suitable for use as the local oscillator in beam transmitters, radar systems and satellite TV receivers, comprises an active element (IMPATT, Gunn diode) at one end of a coaxial transmission line which is terminated at its ... | 08/11/1981 |
| 4238747 | Mode filter apparatus A mode filter apparatus for preventing unwanted modes in a multi-moded structure utilizing a radial plurality of resonant slots on the bottom of the filter cavity. The top of the filter cavity includes a variable height center section to provide mode sele... | 12/09/1980 |
| 4228539 | High frequency transmitter The components of a transistor oscillator are mounted on an end cap rotatably mounted on the outer tube of a cavity resonator which stabilizes the oscillator. The intensity with which a high frequency is applied to the cavity resonator is adjustable by ro... | 10/14/1980 |
| 4211984 | Oscillating circuit arrangements for high frequency industrial generators A high frequency industrial generator, especially suitable for supplying power to a device for heating an electric poorly conducting substance such as a fleece of a cellulose material, comprises two hollow concentrically disposed conductors each of square... | 07/08/1980 |
| 4189684 | Microwave power combiner A microwave power combiner is shown to consist of a plurality of coaxial diode oscillators disposed on the periphery of a circularly cylindrical cavity operating in the TM020 mode, such cavity containing mode suppressor means to prevent any mod... | 02/19/1980 |
| 4188590 | Conical power combiner The specification describes a solid state microwave power combiner wherein a plurality of solid state power generating devices are mounted between adjacent conical support and housing structures. These structures define the microwave electrical circuits f... | 02/12/1980 |
| 4172240 | Cylindrical cavity power combiner for a plurality of coaxial oscillators An improved solid state transmitter (and elements therefor) adapted particularly well to pulsed operation at radio frequencies is disclosed. Such transmitter includes the combination of: A crystal-controlled oscillator producing a continuous wave output s... | 10/23/1979 |
| 4162458 | TM coaxial cavity oscillator and power combiner In an oscillator or power combiner of the type operating at microwave, millimeter wave and above, apparatus for increasing the size, so that one or more active devices can be coupled to the oscillator, including a TM coaxial cavity operating at a predeter... | 07/24/1979 |
| 4155051 | Harmonically tuned high power voltage controlled oscillator In a high power oscillator for frequencies on the order of microwave and above, a method and apparatus for tuning the oscillator in response to a control voltage applied thereto by utilizing a relatively low power varactor diode in a harmonic cavity coupl... | 05/15/1979 |
| 4147994 | Power combiner A power combiner for solid state oscillator circuits is shown to be the combination of a central cavity and a plurality of subcavities, each one of the latter being dimensioned to operate in the TM010 mode to synchronize a plurality of solid st... | 04/03/1979 |
| 4143334 | Microwave/millimeter wave oscillator In an oscillator of the type producing microwaves, millimeter waves and above, apparatus and a method for increasing the size, so that one or more active devices can be coupled to the oscillator, including a first cavity operating at a higher order mode, ... | 03/06/1979 |
| 4121174 | Adjustable microwave power combiner for plurality of coaxial circuits A power combining device for combining the microwave power from a plurality of solid state devices comprises a housing defining a resonator cavity with a plurality of co-axial microwave circuits, including a microwave diode at one end of each circuit and ... | 10/17/1978 |
