Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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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 |
