Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8340313 | Wireless digital transmission of low frequency effects and surround channels for surround sound system | — | 2012-12-25 |
| 7171156 | Method and apparatus for transmitting audio and non-audio information with error correction | Norbert Rehm, Sin Hui Cheah, Karl L. Friedline | 2007-01-30 |
| 6697471 | Extension phone off-hook check for Type 2 Caller ID reception in a telephone adjunct device | Watson Yuet Lai Chan, Sowjanya Reddy Pandipati, David Brewster | 2004-02-24 |
| 6298128 | Unified directory for caller ID and electronic mail addresses | Blaine Edward Ramey, Mingheng Wang | 2001-10-02 |