36. Patents 5,245,229 - Digitally controlled IC Anti-Clipping Mixer 5,307,025 - Audio power amplifier with pop prevention at turn-on and turn-off 5,468,906 - Sound synthesis model incorporating sympathetic vibrations of strings 5,557,227 - Exponential Envelope Generator 5,451,911 - Multi-Phase PLL Timing Generator 5,543,578 - Residual Excited Wave Guide 5,825,881 - Merchandising System 5,841,872 - Data Spinning Encryption System 6,041,123 - Encryption Communications System Pending – Phantom Power Supply System Pending – Current Pump System