Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6940969 | Capacitor cancellation method and apparatus | Robert Chen, John Gammel | 2005-09-06 |
| 6842518 | Frequency-dependent impedance synthesis for DSL interface circuits | Robert Chen, John Gammel | 2005-01-11 |
| 6657496 | Amplifier circuit with regenerative biasing | Robert Chen, John Gammel, Joseph H. Havens | 2003-12-02 |
| 6356593 | Data optimized codec | Nuri Ruhi Dagedeviren, Lynn Emery Ditty, Donald L. Duttweiler, Gerard Pepenella | 2002-03-12 |
| 6169425 | Voltage sensing current foldback switch circuit | Dean M. Umberger | 2001-01-02 |
| 5974363 | Self-testing of smart line cards | John Gammel, Christine Mary Gervesh, Randy Lee Hafer, Ronald Joseph Rees, Robert Vaiden, II | 1999-10-26 |
| 5936391 | Partially temperature compensated low noise voltage reference | Frode Larsen, Douglas G. Marsh | 1999-08-10 |
| 5881129 | Self-monitoring line interface circuit | Robert Chen, John Gammel | 1999-03-09 |
| 5854839 | Dual voltage, self-monitoring line circuit | Robert Chen, John Gammel | 1998-12-29 |
| 5848149 | Subscriber line interface and power circuit | Robert Chen, Paul W. Frazier, John Gammel, Andrew Marsh, Apurba Roy | 1998-12-08 |
| 5659610 | Battery feed circuit | Ian A. Schorr | 1997-08-19 |
| 4939775 | Telephone ringing detector | Kenneth Houck | 1990-07-03 |
| 4896093 | Electronic inductor | — | 1990-01-23 |
| 4510550 | Relay driver | — | 1985-04-09 |
| 4503289 | Line circuit with flux compensation and active impedance termination | — | 1985-03-05 |
| 4477780 | Operational amplifier with multiple switchable outputs | — | 1984-10-16 |
| 4476350 | Battery feed circuit | Denis W. Aull | 1984-10-09 |
| 4454479 | Operational amplifier with improved output capability | — | 1984-06-12 |
| 4323885 | Noise and crosstalk reduction in mid-riser biased encoders | Joseph F. Carriere, Wilmer B. Gaunt, Jr., Joseph Elide Landry | 1982-04-06 |