Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7129872 | Audio signal analog-to-digital converter utilizing a transformed-based input circuit An apparatus for converting an input analog audio signal into digital form including an analog-to-digital converter. An amplifier circuit and step-down transformer provide an interface for the input analog audio signal to the analog-to-digital converter. The step-do... | 10/31/2006 |
| 4862116 | Active phase and amplitude modulator An active phase and amplitude modulator separates an input carrier into four phases. The phases are amplified and modulated separately. Summing circuits combine the phases into a single resultant output.... | 08/29/1989 |
| 4680751 | Polarized carrier modulation This invention provides means for controlling the carrier current in an R.F. amplifier whereby the positive and negative excursions of the carrier current are in accordance with separate modulation signals and a receiver for reproducing the separate modul... | 07/14/1987 |
