Issued Patents 2011
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7933284 | Method and apparatus for improving SIP server performance | Zhi Yong Liang, Hai Shan Wu, Wei Xue, Bo Yang, Yi Xin Zhao | 2011-04-26 |
| 7890765 | Generating and verifying trusted digital time stamp | Jian Zhang, Dong Xie | 2011-02-15 |
| 7873183 | Embedding and detecting watermarks based on embedded positions in document layout | Yuan He, Lin Luo, Ming Su, Zhe Xiang | 2011-01-18 |