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A self defense weapon formed as a memo pad and which is easily held by a person's fingers, therefore making it possible to provide protection from a mugger and also to quickly and easily write a record or a message without failure of missing or forgetting significant information under a stressful situation.
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| Number | Title | Issue Date |
| 8076853 | Terahertz sheet beam klystron A terahertz sheet beam klystron (TSBK) includes an electron gun configured to generate a sheet electron beam and a drift tube through which the sheet beam is propagated. The drift tube is provided with multiple resonant cavities and includes a drift tube circuit inc... | 12/13/2011 |
| 8018158 | Method and apparatus for interaction with a modulated off-axis electron beam An output circuit for a microwave tube is provided that has generally high interaction impedance for good efficiency, has high average power capability, and is physically large for a given operating frequency. The output circuit is designed to operate in conjunction... | 09/13/2011 |
| 7477019 | Electron beam tubes An electron beam tube (17) having a longitudinal axis comprises a first component, such as a ceramic wall (5) and a second component such as a drift tube assembly having a mounting plate (3). The tube further comprises means, such as member (... | 01/13/2009 |
| 7417376 | Linear electron beam tube having a dome shape RF window An electron beam tube device such as an inductive output tube of the integral cavity type has a RF window which re-enters the interaction space within the cavity thereby defining a space that is within the interaction cavity but is outside the vacuum. An output coup... | 08/26/2008 |
| 7365493 | Device for producing high frequency microwaves A device is proposed for producing high-frequency microwaves, having a cathode arrangement with heatable cathodes for emitting electrons, two grating arrangements for controlling and focusing the electrons flow and an anode for recaiving the electrons passing throug... | 04/29/2008 |
| 7348569 | Acceleration of charged particles using spatially and temporally shaped electromagnetic radiation A method and apparatus for accelerating charged particles are disclosed, wherein the method comprises using at least a transverse component of a temporally and spatially shaped electromagnetic field to accelerate one or more charged particles. ... | 03/25/2008 |
| 7268361 | Electron emission device The invention provides an electron beam device 1 comprising at least one field emission cathode 3 and at least one extracting electrode 5, whereby the field emission cathode 5 comprises a p-type semiconductor region 7 connected to ... | 09/11/2007 |
| 7206379 | RF accelerator for imaging applications The present invention is an RF cavity for accelerating electrons in imaging applications such as x-ray tubes and CT applications. An RF cavity having electron emitters placed therein accelerates the electrons across the cavity. The geometric shape of the cavity dete... | 04/17/2007 |
| 7196483 | Balanced circuit for multi-LED driver A driving circuit uses a plurality of transformers to provide currents for driving a plurality of LEDs associated with a plurality of current paths. Each transformer has two induction coils with a coil turn ratio between to the number of turns in each induction coil... | 03/27/2007 |
| 7187130 | Electron beam tubes including a vacuum envelope seal and having a metallized balance ring A linear electron beam tube comprises an electron gun having a cathode and a grid, and an anode arranged in a first portion of a drift tube. The drift tube is within a vacuum envelope and has first and second portions separated by a gap at which point an electron be... | 03/06/2007 |
| 7183564 | Channel spark source for generating a stable focused electron beam In a channel spark source triggered by gas discharge for generating a stable focused electron beam, a gas supply for a hollow cathode thereof is provided which generates in the hollow cathode a pressure differential so that the multiplication of charge carriers in a... | 02/27/2007 |
| 7145297 | L-band inductive output tube An inductive output tube (IOT) operates in a frequency range above 1000 MHz. An output window may be provided to separate a vacuum portion of the IOT from an atmospheric pressure portion of the IOT, the output window being surrounded by a cooling air manifold, the m... | 12/05/2006 |
| 7129504 | Method and apparatus for generation and frequency tuning of modulated, high current electron beams Generating and frequency tuning of modulated high current electron beams and a specific efficient, high current, frequency-tunable device for generating intense radio frequency (RF), microwave electromagnetic fields in a rectangular waveguide. Current multiplication... | 10/31/2006 |
| 7116051 | Multibeam klystron A multibeam, electrostatically focused klystron includes a plurality of conductive members, ones of which are recessed to provide input and output sections of microwave cavities, wherein focusing voltage is applied between those sections. The conductive members are ... | 10/03/2006 |
| 7019601 | Device for amplifying a high frequency signal The present invention pertains to an amplification device for a high-frequency signal. The invention is particularly adapted for the transmission of radiofrequency signals used for television of radio under frequency modulation. The amplification device for a high-f... | 03/28/2006 |
| 7015661 | Method and apparatus for accelerating charged particles A method and apparatus for accelerating charged particles. The charged particles accelerate as they travel through electric fields produced by a plurality of accelerating elements having first and second electrode plates. A magnetic field produced by a pair of magne... | 03/21/2006 |
| 6984940 | Electronic tube with simplified collector The invention relates to amplifying electron tubes operating at microwave frequencies. The electron tube comprises: a pump-out tube that allows the vacuum inside the electron tube to be created; an electron gun that emits an electron beam inside the electron tube; a... | 01/10/2006 |
| 6949887 | High frequency inductive lamp and power oscillator An oscillator includes an amplifier having an input and an output, a feedback network connected between the input of the amplifier and the output of the amplifier, the feedback network being configured to provide suitable positive feedback from the output of the amp... | 09/27/2005 |
| 6930490 | Traction motor fault detection system A method of detecting faults in a traction motor installation having a plurality of AC traction motors powered from a common power source, each of the traction motors being connected by associated motor cables to a cable junction and the common power source being co... | 08/16/2005 |
| 6909235 | Power regulator for intermittent use of traveling wave tube amplifiers in communications satellites A traveling wave tube (TWT) amplifier includes a beam forming electrode (BFE) and a BFE modulator having a bias-based keyer so that the TWT amplifier signals are keyed off during periods when RF power is not to be amplified. Biasing the beam forming electrode voltag... | 06/21/2005 |
| 6777876 | Power-supply unit for microwave tube In a power-supply unit for a microwave tube, voltage between a helix power supply terminal and a cathode power supply terminal is divided into voltage slightly lower than the voltage of a collector power supply terminal. Uni-directional conductive means is provided ... | 08/17/2004 |
| 6646382 | Microminiature microwave electron source A microminiature microwave electron source excited by a pulsed microwave power through a coaxial to emit electrons includes an electrically conductive chamber that is connected to an external conductor of the coaxial cable at an openings end thereof and h... | 11/11/2003 |
| 6574248 | Laminated wigglers A wiggler that, when used in a free electron laser, reduces the harmonicity of the light emitted from the free electron laser. In general, the reduced harmonicity is accomplished by making the magnetic field distribution of the wiggler to be sinusoidal, r... | 06/03/2003 |
| 6556595 | Hybrid wiggler Disclosed is a novel hybrid wiggler as a kind of insertion devices, for example, in an electron accelerator. Different from a conventional hybrid wiggler consisting of two oppositely facing arrays each formed of an alternate arrangement of a plurality of ... | 04/29/2003 |
| 6538385 | Cathode-ray tube and flat electrode of electronic gun and production method A cathode-ray tube includes a plate having a first hole on a first surface of the plate and a second hole on a second surface of the plate. The first and second holes coupled together to allow electron beams to pass therethrough. The plate is a unitary st... | 03/25/2003 |
| 6507152 | Microwave/DC cyclotron wave converter having decreased magnetic field A microwave/DC converter employing fast cyclotron wave of the electron beam. Coupling section for feeding energy into the electron beam contains two microwave cavities 3, 7. The second cavity 7 has a group of 2n (where n=2, 3, . . . ) rod electrodes align... | 01/14/2003 |
| 6486605 | Multibeam electronic tube with magnetic field for correcting beam trajectory A multibeam electron tube with several approximately parallel electron beams passing through a body. Among the beams, at least some define an interbeam volume, each beam defining the interbeam volume being subjected to a perturbing azimuthal magnetic fiel... | 11/26/2002 |
| 6456009 | Adaptive heater voltage algorithm and control system for setting and maintenance of the heater voltage of a vacuum electron device An adaptive heater voltage algorithm and control system for setting and maintaining a vacuum electron device (VED) heater voltage, such as that of a klystron. An algorithm and control system are disclosed that sets and maintains the VED's cathode at the l... | 09/24/2002 |
| 6448850 | Electromagnetic wave amplifier and electromagnetic wave generator An electromagnetic wave amplifier and an electromagnetic wave generator operate using electron beams in a vacuum environment. The amplifier, arranged in a vacuum environment, comprises an electron emitting section for emitting electron beams and an amplif... | 09/10/2002 |
| 6424090 | Modification of millimetric wavelength microwave beam power distribution A system and method for increasing the power density distribution uniformity of a gyrotron radiation beam provides a mirror for reflecting the gyrotron beam onto an object to be irradiated, where the shape of the mirror surface is changed by a plurality o... | 07/23/2002 |
| 6407495 | Electron beam tube having particular structure of the vacuum envelope containing electron gun An electron beam tube includes an electron gun included within a vacuum envelope defined partly by a ceramic cylinder. The ceramic cylinder includes straight sided portions and with an intervening conical section between them. The straight sided portions ... | 06/18/2002 |
| 6377003 | Multi-beam group electron gun for beam index CRT For use in a beam index color cathode ray tube (CRT), a multi-beam group electron gun directs first and second groups of vertically aligned electron beams on respective parallel, horizontally aligned color phosphor stripes on the CRT's display screen. Eac... | 04/23/2002 |
| 6326729 | Field emission cathode and electromagnetic wave generating apparatus comprising the same In a field emission cathode emitting an electron beam modulated by any desired high frequency, a cathode tip is formed in one surface of an N type semiconductor substrate constituting a collector region, an insulating layer formed on the one surface of th... | 12/04/2001 |
| 6294868 | Electron gun for electron tube with cold cathode A Wehnelt electrode and a cold cathode are pressed against and fixed to each other under spring force with a ceramic plate interposed therebetween. Metallized layers connected to a gate electrode and a focusing electrode are disposed on surfaces of the ce... | 09/25/2001 |
| 6191651 | Inductive output amplifier output cavity structure A signal output assembly for an inductive output amplifier comprises a primary output cavity including a drift tube enclosing a modulated electron beam. The density modulated beam passes across a gap separating portions of the drift tube and induces an am... | 02/20/2001 |
| 6133786 | Low impedance grid-anode interaction region for an inductive output amplifier A linear beam amplification device includes an axially centered electron emitting cathode and an anode spaced therefrom. The cathode provides an electron beam in response to a relatively high voltage potential defined between the cathode and the anode. A ... | 10/17/2000 |
| 6127779 | High voltage standoff, current regulating, hollow electron beam switch tube A high power switching apparatus comprises an annular cathode having a surface capable of emitting a hollow electron beam therefrom and an anode cavity spaced from said cathode. The cavity has an annular opening smaller in dimension than a corresponding i... | 10/03/2000 |
| 6114808 | Cold cathode electron gun for microwave tube A cold cathode electron gun includes a field emission cathode array type cold cathode for emitting electron beams toward an RF circuit unit of a microwave tube. An annular Wehnelt electrode, a first anode electrode and a second anode electrode are dispose... | 09/05/2000 |
| 6094010 | Electron gun with photocathode and folded coolant path In an electron gun, a conductive chamber defines a cavity. A photocathode is disposed in the cavity. Photoelectrons are emitted from the photocathode into the cavity when light is applied to the photocathode. A wave guide mounted on the conductive chamber... | 07/25/2000 |
| 6025678 | Linear-beam microwave tube with output cavity beyond the collector A linear-beam microwave tube comprises at least one electron beam directed along an axis crossing a cavity known as an output cavity in which it interacts with a microwave, this cavity having a terminal wall that separates it from a collector, the electro... | 02/15/2000 |
