Security & Protection
| Fri 18 Sep 2026
Beijing, Sept. 18 -- Chinese Patent for Building Interphone Device has been issued to China Unicom and China Unicom Henan Ind Internet Co Ltd. This invention was developed by Zhang Yongshuang, Mu Yongchao, Wang Kun, Cui Ying, Yang Hailong, Cao Yaping, Guo Shuaipeng, Cui Chaoyang, Liang Shuang and Liu Hui.
The patent applicati..