# John H Holt — Patents explained on PatentBrief

John H Holt has 1 landmark patent explained in plain English on PatentBrief.

- [Early Car Wheel Traction Device](https://patentbrief.org/patent/us/1141798/zipper-slide-fastener) — granted 1915
  A 1915 patent for a metal device clamped to a car wheel to improve traction on slippery surfaces.

**Full profile:** https://patentbrief.org/inventor/john-h-holt

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