# J. Douglas Field — Patents explained on PatentBrief

J. Douglas Field has 1 landmark patent explained in plain English on PatentBrief.

- [How Self-Balancing Vehicles Warn Users Before They Tip Over](https://patentbrief.org/patent/us/6302230/segway-personal-transporter) — granted 2001
  A safety system for self-balancing vehicles that monitors how much 'room' the machine has left to accelerate before it loses its ability to stay upright.

**Full profile:** https://patentbrief.org/inventor/j-douglas-field

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