Trademark applications and grants for Du, Zhifang. Du, Zhifang has 1 trademark applications. The latest application filed is for "BIUTEAN"
Entity Type | INDIVIDUAL |
Address | No. 205, Yungai Building Xiaozhong Sub-Zone, Mining Zone Yangquan, Shanxi CHINA 045000 |
Patent Application | Date |
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System and method for enhancing modem performance using digital signal processing techniques 6,085,347 - 09/219,082 Du July 4, 2 | 2000-07-04 |
System and method for communicating electronic messages over a telephone network using acoustical coupling 6,084,952 - 09/218,911 Beerman, Jr. , et al. July 4, 2 | 2000-07-04 |
Mark Image Registration | Serial | Trademark Application Date |
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![]() "BIUTEAN" 90819891 |
BIUTEAN 2021-07-09 |
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