Assignee
Inventors
- Li Yuansheng (2 patents)
- Wang Jun (7 patents)
- Jiang Lijing (2 patents)
- Zhang Zhongqing (2 patents)
- Liu Jiduan (2 patents)
- Ren Shuyan (2 patents)
- Zhao Bo (2 patents)
- Jia Yongzhong (2 patents)
US Patent 6004454 · Granted Dec 21, 1999