Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7711102 | Automatically sequentially ringing alternative telephone numbers | James A. Worsham, David A. Levine, Zhiqiang Zeeman Zhang, Sunil H. Contractor, Ping Song | 2010-05-04 |
| 7194080 | Automatically sequentially ringing alternative telephone numbers | James A. Worsham, David A. Levine, Zhiqiang Zeeman Zhang, Sunil H. Contractor, Ping Song | 2007-03-20 |
| 7035385 | Method and system for screening calls during voicemail messaging | David A. Levine, James A. Worsham, Zhigiang Zhang | 2006-04-25 |
| 6868268 | Audio calling name and number delivery | James A. Worsham, David A. Levine, Zhiqiang Zeeman Zhang | 2005-03-15 |