# Li-Quan Tan — Patents explained on PatentBrief

Li-Quan Tan has 1 landmark patent explained in plain English on PatentBrief.

- [How Stylus Ring Electrodes Detect Pen Tilt and Orientation](https://patentbrief.org/patent/us/10025401/apple-watch-digital-crown) — granted 2018
  Apple's patent for a stylus design that uses specific ring-shaped sensors to accurately measure the angle and tilt of a pen against a touchscreen.

**Full profile:** https://patentbrief.org/inventor/li-quan-tan

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_Source: PatentBrief — https://patentbrief.org. Plain-English explanations of US patents._