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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 5780939 | Method and apparatus for determining orders of non-characteristic harmonic currents, and for compensation of the noncharacteristic harmonic currents A method and an apparatus can determine the orders (z) of non-characteristic harmonic currents (Ih) of a second power supply grid, which is coupled to a first power supply grid using an HVDCT system. The apparatus and method also compensates for these non... | 07/14/1998 |
| 3956717 | Hybrid diplexing filter A hybrid diplexing filter for use in CATV systems and the like, having a pair of high pass filters and a pair of low pass filters connected in an electrical bridge circuit with a common port, a high pass port and a low pass port connected at appropriate n... | 05/11/1976 |
