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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 7212047 | Semiconductor integrated circuit having built-in PLL circuit A semiconductor integrated circuit having a built-in PLL circuit which has two charge pump circuits for charging and discharging capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the two charge pump circuits ... | 05/01/2007 |
| 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 |
| 5159618 | X-ray tube enclosure with resistive coating A X-ray emissive vacuum tube is fully enclosed in an electrically conductive casing with electrical terminals through which bias potentials are applied to the tube. Occasionally an arc discharge occurs between electrodes within the tube generating a high ... | 10/27/1992 |
| 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 |
| 4496913 | Millimeter wave power combiner using concave reflectors A mm wavelength power combiner comprising an open resonator comprising a r of confronting concave reflectors which can be either spherical or parabolic. The resonator dimensions are many times the wavelength of the energy sources to be combined. A plural... | 01/29/1985 |
| 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 |
| 4174492 | Device for attenuating cavity interference waves in a high-frequency electron tube A device for attenuating electromagnetic cavity interference waves, which occur in the vacuum system of a high-frequency electron tube, in particular a transmitting tube, comprising a wave-guide portion coupled to the cavity of the electron tube, which ma... | 11/13/1979 |
| 4132965 | Band-pass filter constructed from concentrically arranged coaxial resonator cavities A device comprising a band-pass filter comprising two concentrically arranged coaxial resonator cavities and a coupling capacitor disposed between these resonator cavities, wherein the bandwidth of the filter can be changed by means of a replaceable diele... | 01/02/1979 |
| 4054875 | Microwave circuit for operating on microwave radiations The present invention relates to microwave circuits for operating on microwave radiations. It consists in combining a dielectric resonator and a microwave diode in a hybrid or integrated circuit, in order to provide a circuit which will operate without an... | 10/18/1977 |
| 4039982 | Coaxial cavity radio frequency tuning circuit having a toroidal-shaped electrode to effect tuning A tuning circuit having a coaxial cavity with a movable toroidal section to effect inductive tuning. The outer conductor is tapered to effect capacitive tuning by movement of the toroidal section axially within the cavity due to varying of the width of th... | 08/02/1977 |
| 4034320 | High power coaxial cavity resonator tunable over a broad band of frequencies An output coaxial cavity for high power electron tubes is described in which the output coupler is directly connected to an intermediate coaxial conductor of the coaxial cavity at a distance from the tube that is greater than one-quarter wavelength and le... | 07/05/1977 |
