{
  "patent_number": "US 1647147",
  "country": "US",
  "title": "How Early Electromagnetic Pumps Moved Liquid Metal Using Magnetic Fields",
  "original_title": "Electromagnetic pump",
  "summary": "A 1927 patent for a pump that uses electromagnetic forces to move conductive liquids without needing moving mechanical parts like pistons or impellers.",
  "what_it_does": "The patent describes a device that moves electrically conductive fluids, such as liquid metals, by applying a magnetic field and an electric current perpendicular to each other. This interaction creates a Lorentz force, which pushes the fluid through a conduit. Because the force acts directly on the fluid itself, the design eliminates the need for traditional mechanical components like gears, valves, or rotating blades that would otherwise wear out or leak when handling harsh molten materials.",
  "what_it_does_not_cover": [
    "Does not cover pumps designed for non-conductive fluids like water or oil.",
    "Does not cover mechanical pumping mechanisms that rely on physical impellers or pistons.",
    "Does not cover systems that lack an integrated electromagnetic field source."
  ],
  "filed": "1924-05-02",
  "granted": "1927-11-01",
  "expires": "1944-11-01",
  "status": "expired",
  "holder": "Individual",
  "holder_url": "https://patentbrief.org/company/individual",
  "inventors": [
    {
      "name": "Louis H Roller",
      "url": "https://patentbrief.org/inventor/louis-h-roller"
    }
  ],
  "times_cited": 7,
  "tags": [
    "mechanical",
    "energy",
    "materials"
  ],
  "abstract": null,
  "url": "https://patentbrief.org/patent/us/1647147/sound-on-film-talking-pictures",
  "markdown_url": "https://patentbrief.org/patent/us/1647147/sound-on-film-talking-pictures/md",
  "google_patents_url": "https://patents.google.com/patent/US1647147",
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}