Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7990210 | Amplifier, amplifying method, and filter An amplifier is provided which includes: a first variable capacitance device of which capacitance is variable, a second variable capacitance device of which capacitance is variable, electrically connected to the first variable capacitance device, and of an inverse c... | 08/02/2011 |
| 7227434 | Tuning screw assembly The present invention relates to a tuning screw assembly comprising a sleeve (100) with internal threads for engaging a tuning screw (200) having external threads. The sleeve comprises a first threaded portion (32) which is axially displaced in ... | 06/05/2007 |
| 7224248 | Ceramic loaded temperature compensating tunable cavity filter A high Q RF cavity resonator loaded with a ceramic disc, the resonator comprising an inner conductive post having a length less than a quarter wavelength. The resonance frequency of the resonator is tunable by changing a distance between a) an outer plate and b) a c... | 05/29/2007 |
| 7135917 | Left-handed nonlinear transmission line media A left-handed nonlinear transmission line system has multiple nonlinear capacitors connected in series between input and output terminals and multiple inductances connected in parallel between the nonlinear capacitors and a return conductor extending between the inp... | 11/14/2006 |
| 6611168 | Differential parametric amplifier with physically-coupled electrically-isolated micromachined structures A micromachined variable capacitor structure is used as a modulation mechanism for a differential parametric amplifier. The capacitance of the capacitor structure is modulated by a control signal while a differential signal is applied to the capacitor str... | 08/26/2003 |
| 6265934 | Q-switched parametric cavity amplifier A Q-switched parametric cavity microwave amplifier has input and output ports for receiving an input signal and producing a switched amplified output signal. A pump signal, preferably at a harmonic of the input signal, is received through a pump signal po... | 07/24/2001 |
| 6111472 | Quasi-optical amplifier A launch quasi-optical amplifier including a photonic bandgap crystal, designed to operate within a specific frequency range. The photonic bandgap crystal is populated with active devices that are coupled to the alternate layers, or defects, in the crysta... | 08/29/2000 |
| 5341114 | Integrated limiter and amplifying devices Integrated circuit structure and processing is provided for a high power limiter including at least a first anti-parallel array of monolithically integrated Schottky diodes. In a further embodiment, integrated circuit structure and processing is provided ... | 08/23/1994 |
| 5089787 | Optically-coupled high frequency amplifier An optically-coupled high frequency amplifier is disclosed herein. The ampliifer of the present invention includes a laser and a receiver coupled by an optical beam. The amplifier further includes a modulator responsive to an input signal for modulating t... | 02/18/1992 |
| 5075573 | Low-noise optical wave amplification device The invention relates to a low-noise amplification device of an optical wave. Signal wave (Fs) to be amplified interferes with a pump wave (Fp) in such a nonlinear medium (1) as a photorefractive crystal. To reduce the noise consider... | 12/24/1991 |
| 4805237 | Parametric diode amplifier A parametric photodiode amplifier suitable for detecting light of frequency f and intensity P and having intersecting I:V curves for zero incident light and for incident light of intensity P. These photodiodes typically have an intrinsic density of carrie... | 02/14/1989 |
| 4610031 | Receiver including surface acoustic wave amplifier A receiver includes a surface acoustic wave amplifier provided in a high frequency amplification stage and generating two outputs corresponding to acoustic waves which propagate through said amplifier in the opposite directions. One of the outputs is demo... | 09/02/1986 |
| 4484144 | Semiconductor light amplifier A semiconductor light amplifier having an active layer performing a light amplification function, in which the light amplification is performed intermittently by a stable clock timing synchronized with the clock timing of an input light pulse train to the... | 11/20/1984 |
| 4461039 | Quasi-optical balanced biconical mixer A biconical antenna, the halves of which are connected together at the apex by a pair anti-parallel diodes through a pair of parallel conductive whiskers or wires. A pair of quasi-optical lenses focuses energy from a local oscillator and from a submillime... | 07/17/1984 |
| 4426737 | Circuit for generating a pumping signal for a surface elastic wave parametric device in a receiver A receiver is provided with a surface elastic wave amplifier of a parametric amplification type within an HF amplifier unit, and with a circuit for providing pumping power for said surface elastic wave amplifier from oscillating outputs of an IF convertin... | 01/17/1984 |
| 4410833 | Solid state magnetron A magnetron in which the space between the anode and cathode contains a h mobility semiconductor. The structure is non-cylindrically symmetric because the anode and cathode are placed on top of the semiconductor. The electrons are injected into the subst... | 10/18/1983 |
| 4361814 | Distributed optical parametric amplifier A parametric amplifier including a semiconductor body portion (10) comprising a plurality of zones (11,13,15, . . . ) of a first conductivity type, each of the zones having a thickness less than or equal to the Debye length in the semiconductor body porti... | 11/30/1982 |
| 4348650 | Surface-acoustic-wave parametric device A surface-acoustic-wave parametric device characterized in that a width of a parametric interaction region in a direction perpendicular to the propagation direction of surface acoustic wave is varied so as to correspond to a desired frequency characterist... | 09/07/1982 |
| 4317231 | Microwave circuit for a parametric upper sideband down converter In a microwave circuit for a parametric upper sideband down converter with real image frequency termination conductance, including a pump circuit supplying a pump signal, a parallel circuit at its input, an intermediate frequency circuit at its output, an... | 02/23/1982 |
| 4287605 | Directional filter for mixers, converters and the like First and second directional couplers each having a primary arm, a through arm and two secondary arms with a resonant circuit constructed to include the two secondary arms of each directional coupler. The directional filter forms a four port device with s... | 09/01/1981 |
| 4286276 | Dual Schottky contact avalanche semiconductor structure with electrode spacing equal to EPI layer thickness A semiconductor structure comprising two conventional electrodes of an avalanche diode and furthermore a supplementary electrode. In a preferred embodiment the conventional and supplementary electrodes form two combs of which the teeth are intermingled an... | 08/25/1981 |
| 4254388 | Frequency selector apparatus A frequency selector apparatus wherein unidirectional input and output surface-acoustic-wave transducers are provided in an acoustic wave propagation path formed on a piezoelectric device and reflecting electrodes, to which a.c. signals are applied respec... | 03/03/1981 |
| 4232277 | Microwave oscillator for microwave integrated circuit applications Disclosed is a means for obtaining a high Q oscillator which is compact and s adapted to be readily incorporated into known forms of microwave integrated circuits, e.g. a parametric amplifier. The oscillator which for example may comprise a pump oscillator... | 11/04/1980 |
| 4160215 | Single diode upper sideband terminated parametric amplifier A single varactor diode parametric amplifier is described which has a broadband termination at the upper sideband frequency in the pump waveguide. This termination presents an open circuit condition at the upper sideband frequency, which, in combination w... | 07/03/1979 |
| 4158817 | Microwave input circuit with parametric down converter A microwave input circuit including a parametric upper sideband down converter for receiving an input signal whose frequency is not much different from the intermediate frequency produced at the output of the down converter. The down converter may be eith... | 06/19/1979 |
| 4138648 | Balanced synchronous parametric amplifier A wideband synchronously pumped parametric amplifier is described that features minimum time delay along with wide bandwidth, a low noise figure and cost for advantageous use in receivers designed to receive television signals from a satellite through a r... | 02/06/1979 |
| 4131858 | Beam lead dual parametric amplifier A parametric amplifier having a beam lead dual Schottky barrier diode fabricated on a single semiconductor chip across a waveguide cavity. Two anode leads are bonded to the adjacent waveguide walls for coupling to a pump source; and a common cathode lead ... | 12/26/1978 |
| 4099228 | Harmonic mixing with an anti-parallel diode pair A harmonic mixer utilizing an anti-parallel configuration of two diodes which, when excited by a voltage waveform VLO sin ωLO t + Vs sin ωs t where VLO is much greater than Vs, yields a t... | 07/04/1978 |
| 4061990 | Frequency combining circuit A frequency combining circuit in the form of a planar transmission circuit has a four-port directional coupler, two transmission lines respectively coupled to the forward and backward coupling ports of the directional coupler, and two filters respectively... | 12/06/1977 |
| 4051364 | Photoparamp array multiplexer A photoparamp array multiplexer to provide photoparametric amplification in n array of photodiode diodes connected in parallel which essentially eliminates the need for an array of preamplifiers.... | 09/27/1977 |
| 4020341 | Generating and using coherent optical radiation Optical radiation generation and detection using metal-to-metal diode junctions. Coherent optical radiation is generated by using an antenna connected to a metal-to-metal diode junction with non-linear current-voltage characteristics and by coupling to th... | 04/26/1977 |
| 3992675 | Broadband, upper sideband terminated, low-noise parametric amplifier A parametric amplifier which includes series coupled diodes contained in a resonating wave guide for providing a low noise figure by limiting the impedance to the idler circuit and inhibiting current flow in the upper sideband circuit. The mechanism for i... | 11/16/1976 |
| 3991373 | Input circuit for a microwave receiving system An input circuit for use in a microwave receiving system. The input circuit includes an antenna for receiving the microwave signals and a parametric down converter, which operates in a lower side-band frequency position. The parametric down converter incl... | 11/09/1976 |
| 3934208 | Low noise modular parametric amplifier The low noise parametric amplifier disclosed is a non-cryogenic non-redundant plural stage unit with excess gain such that failure of any one stage results in only minor degradation of signal-to-noise ratio. While the amplifier is of general application, ... | 01/20/1976 |
