...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7112924 | Electronic energy switch for particle accelerator Some embodiments include an accelerator waveguide to receive RF power, the accelerator waveguide comprising a side cavity, an element fixedly disposed within the side cavity, and a device coupled to the element, wherein the device and the element are operable to con... | 09/26/2006 |
| 6313710 | Interaction structure with integral coupling and bunching section The interaction structure with integral coupling and bunching section and method of use of the present invention produces backward wave oscillations in an RF structure which combines ballistic bunching and extended beam-wave interaction in a complex reson... | 11/06/2001 |
| 6163112 | Device for quick frequency tuning of a microwave tube using a direct sensing means A frequency tuning device for a microwave tube. The tube has one or more resonant cavities which are tuned with the aid of a movable tuning element for each cavity. Each tuning element has an actuating device and a sensor which detects the position of the... | 12/19/2000 |
| 6034572 | Magnetically insulated line oscillator microwave pulse generator In a magnetically insulated line oscillator device having a cathode 11, a surrounding slow wave structure 15 has a tapered configuration so that the effective cavity depth in the slow wave structure 15 progressively diminishes along a part of the length o... | 03/07/2000 |
| 5742209 | Four cavity efficiency enhanced magnetically insulated line oscillator A four cavity, efficient magnetically insulated line oscillator (C4-E MILO) having seven vanes and six cavities formed within a tube-like structure surrounding a cathode. The C4-E MILO has a primary slow wave structure which is comprised of four vanes and... | 04/21/1998 |
| 5142250 | High power microwave generator Conversion of electron beam energy into high power microwave energy is efted within the cavity of a Klystron device to which the electron beam is accelerated from a continuous supply source through an ion focussing channel. Ion focussing is achieved by e... | 08/25/1992 |
| 5124664 | Field emission devices A klystron device comprises an array of cold-cathode field emission elements arranged to form a distributed amplifier which further comprises a modulation strip line and a catcher strip line. A collector electrode is spaced from the catcher strip line. Th... | 06/23/1992 |
| 5065109 | Electropneumatic band selector A band selector for a klystron includes a cam carrier and a plurality of cam followers. The cam carrier includes a plurality of cams with the cams being arranged in a plurality of rows. Each of the cam followers has a first end adapted to be mounted to a ... | 11/12/1991 |
| 5038077 | Gyroklystron device having multi-slot bunching cavities A gyroklystron device includes an electron beam source, a plurality of bunching cavities and an output cavity. A first bunching cavity has an input coupling aperture for receiving an rf signal from an rf signal injecting source. Each of the bunching cavit... | 08/06/1991 |
| 4961058 | Feedback stabilization loop Stabilizing a signal generating source by coupling a small amount of the output power through a bandpass filter tuned to the desired frequency and injecting the power back into the source. In another embodiment the filtered power may be increased by injec... | 10/02/1990 |
| 4931695 | High performance extended interaction output circuit There is provided a high performance extended interaction output circuit [EIOC] having two cavities. The EIOC of the present invention has an image impedance which is twice the magnitude of its output load resistance. The EIOC of the present invention als... | 06/05/1990 |
| 4908549 | Motor-driven device for preadjusted frequency tunings for a klystron A klystron comprises a plurality of resonant cavities, the frequency of which is defined by a piston within each cavity. In order to change the frequency of the klystron, each piston is provided with a rod applied against an adjusting screw under the pres... | 03/13/1990 |
| 4700146 | Automatic tuning of cavity klystron using sampled RF output A processor-controlled drive motor system for tuning a cavity klystron monitors the output (amplitude-vs-frequency) of the klystron and compares that monitored performance output with an intended amplitude-vs-frequency profile. Differences between the two... | 10/13/1987 |
| 4661784 | Klystron having fixed and variable tuning mechanisms A tuning structure for a klystron oscillator is provided by a set of holes extending part way through cavity walls of the klystron. The holes provide weakened portions in the cavity walls which permit an inward depression of the walls at the sites of the ... | 04/28/1987 |
| 4546325 | Fast-acting tuner for multiple-channel klystrons A cylinder or barrel fitted with cams is used to limit the outward movement of spring-loaded plungers attached to cavity shorting bars in a klystron. Different tunings of the klystron are achieved by rotating the cylinder so that different rows of cams li... | 10/08/1985 |
| 4531103 | Multidiameter cavity for reduced mode competition in gyrotron oscillator In a gyro-monotron oscillator a single, "monotron" cavity is used to interact with the electron beam. To handle very high powers without excessive cavity loss, the cavity is excited in a higher order mode such as TE0m1. Other modes can be reson... | 07/23/1985 |
| 4527129 | Klystron tuning control system A klystron tuning control system has a D.C. motor which is connected to the tuning shaft of the klystron. The position of the tuning shaft is detected electrically and used to control the turning of the D.C. motor in order to reduce to zero a difference b... | 07/02/1985 |
| 4300105 | Two-cavity klystron oscillator A klystron oscillator has an input cavity resonant in a TM010 mode and a larger output cavity resonant in a TMOnO mode where n is an integer greater than 1, preferably equal to 2. The input cavity, with re-entrant bosses defining a b... | 11/10/1981 |
| 4216409 | Multi-cavity klystron device A multi-cavity klystron device having a plurality of resonance cavities, comprising a plurality of movable elements, each of which is mounted on each of said resonance cavities and which is adapted to change the resonance frequency in each cavity, a plura... | 08/05/1980 |
| 4209755 | Tunable oscillator comprising dual-cavity klystron A self-exciting oscillator comprises a klystron with an input cavity and an output cavity, interconnected by a feedback port, which resonate at fractionally different frequencies in the microwave range. The output cavity, alone, is tunable to vary the ope... | 06/24/1980 |