Issued Patents All Time
Showing 26–44 of 44 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7516340 | Powered device including a classification signature resistor | D. Matthew Landry | 2009-04-07 |
| 7511930 | System and method for high voltage protection of powered devices | — | 2009-03-31 |
| 7477095 | Current mirror architectures | — | 2009-01-13 |
| 7260210 | Unbalanced slic with a built-in ring circuit | — | 2007-08-21 |
| 7254229 | Method and apparatus for an active impedance feedback | — | 2007-08-07 |
| 7215764 | Current sensing echo cancellation device | — | 2007-05-08 |
| 7181002 | Method and apparatus for a single power supply for dual power mode | — | 2007-02-20 |
| 7113590 | Method and apparatus for a differential feedback in an active impedence feedback circuit | — | 2006-09-26 |
| 6956945 | Method and apparatus for phantom battery feed | — | 2005-10-18 |
| 6356624 | Method and apparatus for detecting and measuring foreign voltages | Richard Bruce Webb, Walter S. Schopfer | 2002-03-12 |
| 6351528 | Integrated ringer for short telephone lines | — | 2002-02-26 |
| 6026159 | Integrated ringer for short telephone lines | — | 2000-02-15 |
| 5986290 | Silicon controlled rectifier with reduced substrate current | — | 1999-11-16 |
| 5737411 | Battery switching in a telephone subscriber line interface circuit | Richard Bruce Webb | 1998-04-07 |
| 5694465 | Integrated ringer for short telephone lines | — | 1997-12-02 |
| 5619567 | Variable DC feed characteristic in a subscriber line interface circuit | — | 1997-04-08 |
| 4563548 | Method and circuit for telephone dialing signal generation | Ayoub H. Misherghi, Arthur F. Lange | 1986-01-07 |
| 4359609 | Circuit with feedback for controlling the impedance thereof | — | 1982-11-16 |
| 4315207 | Current controlled battery feed circuit | — | 1982-02-09 |