| 8004863 |
Circuit device and method of providing feedback across an isolation barrier |
Richard Bruce Webb |
2011-08-23 |
| 7541790 |
Method and apparatus for power savings in a switching regulator |
Richard Bruce Webb |
2009-06-02 |
| 7450360 |
Multi-mode regulator |
— |
2008-11-11 |
| 6990191 |
Method and apparatus for handling voice and data signals |
Jeffrey J. Anderson, Merle L. Miller |
2006-01-24 |
| 6778663 |
Method and apparatus for sensing current |
— |
2004-08-17 |
| 6728370 |
Method and apparatus for impedance matching |
Jeffrey J. Anderson, Carlin D. Cabler |
2004-04-27 |
| 6356624 |
Method and apparatus for detecting and measuring foreign voltages |
Russell J. Apfel, Richard Bruce Webb |
2002-03-12 |
| 5878133 |
Digital direct current feed control for a communication system |
Yan Zhou |
1999-03-02 |
| 5809109 |
Integrated ring sensor with fault detection |
Michael Moyal |
1998-09-15 |
| 5640451 |
Power cross detection using loop current and voltage |
— |
1997-06-17 |
| 5638440 |
Protection circuit for telephone systems |
Michael A. Nix, Sergio R. Ramirez |
1997-06-10 |
| 5636273 |
Integrated ring detection circuit and power cross detection circuit with persistence timers |
Sergio R. Ramirez |
1997-06-03 |
| 5249226 |
Apparatus for controlling a current supply device |
— |
1993-09-28 |