Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE40935 | Control of access to the call completion on busy link service in a private telecommunication network | Cao Thanh Phan | 2009-10-13 |
| 6643366 | Control of access to the call completion on busy link service in a private telecommunication network | Cao Thanh Phan | 2003-11-04 |