# Louis H Roller — Patents explained on PatentBrief

Louis H Roller has 1 landmark patent explained in plain English on PatentBrief.

- [How Early Electromagnetic Pumps Moved Liquid Metal Using Magnetic Fields](https://patentbrief.org/patent/us/1647147/sound-on-film-talking-pictures) — granted 1927
  A 1927 patent for a pump that uses electromagnetic forces to move conductive liquids without needing moving mechanical parts like pistons or impellers.

**Full profile:** https://patentbrief.org/inventor/louis-h-roller

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