Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7146199 | Cordless digital audio headphone A cordless digital audio headphone is disclosed. The headphone includes a pair of earphones connected to a headband. The earphones provide audible signals. The headphone also includes a memory unit positioned on the headband for containing digitally stored audio inf... | 12/05/2006 |
| 4263676 | RF amplifying system having image rejection An improved RF amplifier system in which an undesired frequency such as the image frequency is rejected. The amplifier circuit includes a first tank circuit tuned to a first predetermined frequency by a first voltage variable capacitor and a second tank c... | 04/21/1981 |
| 4247954 | Active window antenna for motor vehicles To minimize overmodulation in an active window antenna and radio receiver system, an amplification control voltage is produced in the active antenna, i.e., directly behind the antenna pre-amplifier, and is used to control the amplification of the pre-ampl... | 01/27/1981 |
| 4115778 | Electronic solid state FM dipole antenna A miniature antenna which is rugged, extremely light-weight and which is especially adapted for reception across the entire FM band comprising an omnidirectional half-wave dipole having feed structure comprised of curved overlapping dipole element points ... | 09/19/1978 |
| 3942119 | Multiple-transmission-channel active antenna arrangement An antenna has two output terminals and is operative for receiving electromagnetic radiation and converting the same into electrical signals appearing across the two antenna output terminals. There are provided a first and a second transmission channel, e... | 03/02/1976 |
