Did You Know...
...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
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| Number | Title | Issue Date |
| 4644289 | Variable power amplifier for audio frequency signals and method A variable power amplifier having a constant current differential amplifier driving a cascaded driving amplifier, a variable power amplifier including a vacuum tube for selectively amplifying output signals wherein the drive of the variable power amplifie... | 02/17/1987 |
| 4415865 | Circuit arrangement for controlling the quiescent current in a class AB amplifier stage A circuit arrangement incorporated in a class AB amplifier for controlling the quiescent current through the transistors (T1, T2) incorporated therein so that the load current (IL) is zero when the input voltage (IIN) to the amplifie... | 11/15/1983 |
