Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 6701779 | Perpendicular torsion micro-electromechanical switch A semiconductor torsional micro-electromechanical (MEM) switch is described having a conductive movable control electrode; an insulated semiconductor torsion beam attached to the movable control electrode, the insulated torsion beam and the movable contro... | 03/09/2004 |
| 5878333 | Tuner with coaxial resonator trimmer A tuner circuit includes a first IF signal generating a first oscillation signal, a local oscillator circuit outputting a local oscillator signal, a mixing circuit mixing the first IF signal and the oscillation signal to generate a second IF signal, and a... | 03/02/1999 |
| 5070313 | Tuning arrangement for combiner filter having dielectric waveguide resonator and coacting tuning capacitance The present invention relates to a tuning arrangement for combiner filters which include a dielectric waveguide resonator (3) and a tuning capacitance (4) coacting therewith. According to the invention, the tuning capacitance (4) has the form of a substan... | 12/03/1991 |
| 4926147 | Arrangement for tuning a balanced-to-ground resonator An apparatus for tuning a balanced-to-ground resonator, the resonator including at least one radio-frequency coil, the radio-frequency coil having an inductance forming a resonant circuit in combination with a capacitor, includes two identical differentia... | 05/15/1990 |
| 4897624 | Unitary capacitance trimmer Apparatus for adjusting capacitance between an electronic component and external circuitry. The electronic component is unitarily provided with a plurality of conductive leads for connection to external circuitry with at least one of the leads being confi... | 01/30/1990 |
| 4622528 | Miniature microwave filter comprising resonators constituted by capacitor-coupled rejector circuits having tunable windows The microwave filter comprises resonators constituted by capacitor-coupled rejector circuits. The tuning and coupling capacitors are composed of parallel metal plates supported and separated by the dielectric of a substrate. The surface of at least one pl... | 11/11/1986 |
| 4375626 | Precision linear tuning circuit A precision linear tuning circuit having particular utility to applications employing superconductors in a supercooled environment. Two capacitors, one fixed and one variable, are connected in parallel by an arrangement of shared, concentric electrodes. T... | 03/01/1983 |
