Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6999581 | Event detection circuit | Tony S. El-Kik, Donald R. Laturell, Steven B. Witmer | 2006-02-14 |
| 6920218 | Combination clock and charge pump for line powered DAA | Timothy W. Fuehrer, Donald R. Laturell, Steven B. Witmer | 2005-07-19 |
| 6763107 | Method and apparatus for reducing distortion in a line powered modulator circuit | Jonathan H. Fischer, Donald R. Laturell, Lane A. Smith, Weilin Zhu | 2004-07-13 |
| 6744888 | Line interface circuit with event detection signaling | Tony S. El-Kik, Donald R. Laturell, Steven B. Witmer | 2004-06-01 |
| 6735305 | Detection of low tip/ring currents in a line powered DAA | Jonathan H. Fischer, Donald R. Laturell, Lane A. Smith, Michael S. Toth, Michael G. Williams +1 more | 2004-05-11 |
| 6731728 | Low noise line powered DAA with differential feedback | Donald R. Laturell, Steven B. Witmer | 2004-05-04 |
| 6728371 | Method and apparatus for stabilization of a line powered modulator circuit | Jonathan H. Fischer, Donald R. Laturell, Lane A. Smith, Weilin Zhu | 2004-04-27 |
| 6674857 | Startup procedure for international line powered DAA | Jonathan H. Fischer, Donald R. Laturell, Lane A. Smith, Michael S. Toth, Weilin Zhu | 2004-01-06 |
| 6621904 | Pre-charging line modem capacitors to reduce DC setup time | Jonathan H. Fischer, Donald R. Laturell, Lane A. Smith, Weilin Zhu | 2003-09-16 |
| 6421430 | Line powered DAA with single ended feedback | Donald R. Laturell, Steven B. Witmer | 2002-07-16 |
| 6418220 | Extended feedback circuit employing capacitive coupling and sampled data filters | Jonathan H. Fischer, Donald R. Laturell, Steven B. Witmer | 2002-07-09 |
| 6396877 | Method and apparatus for combining serial data with a clock signal | Donald R. Laturell, Steven B. Witmer | 2002-05-28 |
| 6275581 | Extended feedback circuit employing capacitive coupling and sampled data filters | Jonathon Fischer, Donald R. Laturell, Steven B. Witmer | 2001-08-14 |
| 6205219 | Call related information reception using sigma/delta modulation | Donald R. Laturell, Steven B. Witmer | 2001-03-20 |
| 6198944 | Method for telephone line interlock and cellular interconnect | Donald R. Laturell, Steven B. Witmer | 2001-03-06 |
| 5912513 | Method and apparatus for reducing power dissipation in DC termination circuit | Donald R. Laturell, Steven B. Witmer | 1999-06-15 |
| 5877565 | Communication card with telephone line interlock and cellular interconnect | Donald R. Laturell, Steven B. Witmer | 1999-03-02 |