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...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 |
| 7408401 | Vacuum tube replacement device, circuit and system A system is provided for a solid-state implementation of a vacuum tube replacement device. The system may derive power from a target amplifier filament supply. The system may include active or passive functions for noise reduction, voltage isolation, servo biasing, ... | 08/05/2008 |
| 7355475 | Output circuit of vacuum-tube amplifier An output circuit of a vacuum-tube amplifier is disclosed. An output circuit of a conventional vacuum-tube amplifier has shortcomings that a front end amplification unit uses a coupling condenser or a transformer to output an AC signal to an output node, a bias volt... | 04/08/2008 |
| 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 |
| 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 |
| 6895096 | Microchannel plate audio amplifier A audio amplifier employs microchannel plate for multiplying input electrons to produce output electrons at a rate corresponding to an audio input signal. The MCP may have a segment input source, segmented input and output electrodes or a segmented anode for allowin... | 05/17/2005 |
| 4967162 | Stripline traveling wave device and method A traveling-wave device for amplification of RF signals at microwave frequencies, primarily from UHF to submillimeter wavelengths, comprised primarily of broad-coupled parallel striplines of which one is a cathode stripline and the other a non-interceptin... | 10/30/1990 |
| 4119921 | Amplifier device for transmitting tetrode Amplifier device for the UHF-TV band, assembled from cylindrical conductors which are coaxially arranged with respect to one another and connected to a tetrode. The screen grid is grounded and the control grid is provided with dc voltage connecting termin... | 10/10/1978 |
| 3950710 | Wide band, in-line, microwave amplifier A wide band, in-line, microwave amplifier having a large gain bandwidth product includes a coaxial tetrode located within a cavity. High gain in a relatively short active section of the amplifier results from close placement of the tetrode control grid to... | 04/13/1976 |
