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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 4980891 | Clocked optical regenerator and other optoelectronic functional circuits A diode laser amplifier used as a clocked optical regenerator and other diode laser amplifier optoelectronic functional circuits are disclosed. In the regenerator circuit (101), the input optical pulse data signal to be regenerated is inputed to a diode l... | 12/25/1990 |
| 4969040 | Apparatus and method for differential sub-band coding of video signals A method and apparatus for achieving a high compression of a video signal. The PEL-by-PEL difference between an input signal consisting of digital PEL values of a scanned video signal and a motion compensated interframe prediction signal is decomposed int... | 11/06/1990 |
| 4941155 | Method and circuitry for symbol timing and frequency offset estimation in time division multiple access radio systems In order to correctly demodulate a received sequential burst of symbols in a time division multiplexed/time division multiple access (TDM/TDMA) portable radio digital telephony communications system, proper timing of the sampling time in each received sym... | 07/10/1990 |
| 4937841 | Method and circuitry for carrier recovery for time division multiple access radio systems Coherent phase recovery in a time division multiple access (TDMA) system can be attained in a novel manner. After symbol-timing and frequency-offset are estimated, the stored received phase at the desired sampling instant is gated from memory and fed to t... | 06/26/1990 |
| 4904041 | Short optical pulse generator having a looped directional coupler external cavity A short optical pulse generator is disclosed in which the optical radiation from a driven laser diode (101) is coupled to an external cavity which includes a looped directional coupler (104, 120) which reflects a portion of the optical radiation back to t... | 02/27/1990 |
