{
  "patent_number": "US 2370990",
  "country": "US",
  "title": "How George Nissen Invented the Modern Trampoline",
  "original_title": "Tumbling device",
  "summary": "The 1945 patent for a 'tumbling device' that introduced the modern trampoline, using a flexible canvas bed stretched over a frame with springs to allow for high-bouncing acrobatics.",
  "what_it_does": "The patent describes a frame-supported apparatus designed for acrobatic tumbling. It utilizes a resilient, flexible canvas sheet stretched tightly across a rectangular frame by a series of tensioning springs. This configuration allows a user to jump onto the surface, which deforms to store kinetic energy and then releases it to launch the user upward, facilitating repetitive bouncing maneuvers.",
  "what_it_does_not_cover": [
    "Does not cover non-spring-based jumping surfaces like simple foam pits.",
    "Does not cover inflatable bouncers or air-filled structures.",
    "Does not cover specialized training equipment that lacks the specific frame-and-spring tensioning system described."
  ],
  "filed": "1941-06-04",
  "granted": "1945-03-06",
  "expires": "1962-03-06",
  "status": "expired",
  "holder": "Individual",
  "holder_url": "https://patentbrief.org/company/individual",
  "inventors": [
    {
      "name": "George P Nissen",
      "url": "https://patentbrief.org/inventor/george-p-nissen"
    }
  ],
  "times_cited": 37,
  "tags": [
    "mechanical",
    "consumer_electronics"
  ],
  "abstract": null,
  "url": "https://patentbrief.org/patent/us/2370990/trampoline-nissen",
  "markdown_url": "https://patentbrief.org/patent/us/2370990/trampoline-nissen/md",
  "google_patents_url": "https://patents.google.com/patent/US2370990",
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}