Famous Patents
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 |
| 7446601 | Electron beam RF amplifier and emitter RF field is sensed to produce an incoming voltage that drives a microarray of electron guns in a sweep pattern towards a detector array. The electron guns emit a beam current that may amplify the incoming voltage signal, and the detector material may be selected to ... | 11/04/2008 |
| 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 |
| 6987360 | Backward wave coupler for sub-millimeter waves in a traveling wave tube A slow wave structure for coupling RF energy with an electron beam comprises a co-propagating RF section including a plurality of pins having a uniform separation from the plane of an electron beam axis. An output aperture is positioned a half wavelength from a refl... | 01/17/2006 |
| 5825140 | Radio-frequency type charged particle accelerator A radio-frequency type charged particle accelerator includes a RFQ accelerator and a rear stage RF accelerator both of which are contained in a single evacuated chamber. The RFQ accelerator has quadrupole electrodes positioned along a traveling path of th... | 10/20/1998 |
| 5363054 | Double beam cyclotron maser A double beam cyclotron maser comprising two electron guns for introducing two electron beams traveling parallel to each other at different speeds into an electron drift tube/waveguide. The beams have respectively different electron cyclotron space-charge... | 11/08/1994 |
| 4801847 | Charged particle accelerator using quadrupole electrodes A charged particle accelerator is provided with quadrupole electrodes with surfaces that are opposed to each other and are undulated, and with an external resonance circuit. The external resonance circuit consists of a capacitor formed by the opposing ele... | 01/31/1989 |
| 4533875 | Wide-band gyrotron traveling-wave amplifier A high power amplifier for amplifying millimeter-wave radiation comprising: a length of metallic waveguide tapered from a small cross-sectional end to a larger cross-sectional end; a magnetron-type electron injection gun for injecting a spiral beam of rel... | 08/06/1985 |
| 4370621 | High efficiency gyrotron oscillator and amplifier An electron cyclotron maser high-frequency generator/amplifier having a cavity resonator positioned in an axial magnetic field. A spiralling beam of relativistic electrons is injected into the cavity and stimulated emission of radiation by the electrons t... | 01/25/1983 |
| 4350927 | Means for the focusing and acceleration of parallel beams of charged particles Apparatus for focusing beams of charged particles comprising planar arrays of electrostatic quadrupoles. The array may be assembled from a single component which comprises a support plate containing uniform rows of poles. Each pole is separated by a hole ... | 09/21/1982 |
| 4224576 | Gyrotron travelling-wave amplifier An apparatus for amplifying coherent radiation at millimeter and submillimeter wavelengths includes the combination of a travelling-wave-tube cyclotron-maser-amplifier structure and a magnetron-injection electron gun. The amplifier structure includes a ... | 09/23/1980 |
| 4105890 | Device for electron-beam heating of materials A device for electron-beam heating of materials comprises an electron gun and an electromagnetic electron beam control system with a rectangular magnetic circuit. The opposite rods of the magnetic circuit accommodate beam deflection windings as well as be... | 08/08/1978 |
