Issued Patents 2017
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9686269 | Method and system for distinguishing humans from machines and for controlling access to network services | Yudong Zhang, Qian Zhang | 2017-06-20 |
| 9648008 | Terminal identification method, and method, system and apparatus of registering machine identification code | Yudong Zhang, Zhenyuan Zhang, Jian Liu | 2017-05-09 |
| 9571490 | Method and system for distinguishing humans from machines | Yudong Zhang | 2017-02-14 |