Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8369510 | Method and apparatus for ringing | — | 2013-02-05 |
| 7813500 | Method and apparatus for ringing | — | 2010-10-12 |
| 7630490 | Method and apparatus for DC feed | Jin Li | 2009-12-08 |
| 6990191 | Method and apparatus for handling voice and data signals | Jeffrey J. Anderson, Walter S. Schopfer | 2006-01-24 |
| 6865269 | Method and apparatus for switch hook detection | Jin Li | 2005-03-08 |
| 6058161 | System and method for programmable telephone subscriber line test | Jeffrey J. Anderson, Yan Zhou | 2000-05-02 |
| 5963159 | Arrangement and method for controlling gain of analog-to-digital converters | Firas N. Abughazaleh, Vijayakumaran V. Nair, Michael Stibila | 1999-10-05 |
| 5956386 | Telephone subscriber line diagnostics system and method | — | 1999-09-21 |
| 5675271 | Extended chip select reset apparatus and method | Imran Baqai | 1997-10-07 |
| 5452345 | Metering signal level control circuit | Yan Zhou, V. Vijayakumaran Nair, Sergio R. Ramirez | 1995-09-19 |
| 4860285 | Master/slave synchronizer | Dale E. Gulick | 1989-08-22 |