Inventor

Guo Xian Dong

CN3 patents

Patents

3 patents

US12474792B1Nov 18, 2025

Marker writing system

REMARKABLE AS0 citations56

US12411561B1Sep 9, 2025

Marker protection system

REMARKABLE AS0 citations56

US12416999B1Sep 16, 2025

Replaceable conductive marker tip

REMARKABLE AS0 citations54