{
  "patent_number": "US 1994488",
  "country": "US",
  "title": "Igor Sikorsky's Early Design for a Vertical Takeoff Aircraft",
  "original_title": "Direct lift aircraft",
  "summary": "A 1935 patent by aviation pioneer Igor Sikorsky detailing a mechanical configuration for an aircraft capable of direct vertical lift.",
  "what_it_does": "The patent describes a structural arrangement for an aircraft designed to achieve vertical flight through direct lift mechanisms. It focuses on the mechanical integration of rotors or lifting surfaces that allow an aircraft to ascend without a traditional horizontal runway takeoff. By positioning the lifting components to provide upward thrust directly, the design enables the craft to hover or climb vertically.",
  "what_it_does_not_cover": [
    "Does not cover modern fly-by-wire electronic flight control systems.",
    "Does not cover turbine-powered propulsion systems, as it predates their aviation use.",
    "Does not cover multi-rotor drone configurations common in modern consumer electronics."
  ],
  "filed": "1931-06-27",
  "granted": "1935-03-19",
  "expires": "1952-03-19",
  "status": "expired",
  "holder": "Sikorsky Aircraft Corp",
  "holder_url": "https://patentbrief.org/company/sikorsky-aircraft-corp",
  "inventors": [
    {
      "name": "Igor I Sikorsky",
      "url": "https://patentbrief.org/inventor/igor-i-sikorsky"
    }
  ],
  "times_cited": 16,
  "tags": [
    "aerospace",
    "mechanical"
  ],
  "abstract": null,
  "url": "https://patentbrief.org/patent/us/1994488/helicopter-sikorsky",
  "markdown_url": "https://patentbrief.org/patent/us/1994488/helicopter-sikorsky/md",
  "google_patents_url": "https://patents.google.com/patent/US1994488",
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}