{
  "patent_number": "US 1906844",
  "country": "US",
  "title": "How the Iron Lung Artificial Respirator Works",
  "original_title": "Artificial respirator",
  "summary": "A 1933 patent for a mechanical respirator that uses external air pressure changes to force a patient's lungs to expand and contract.",
  "what_it_does": "The device, commonly known as an iron lung, creates a sealed environment around a patient's body, leaving only the head exposed. By using a pump to rhythmically lower and raise the air pressure inside the chamber, the device forces the patient's chest to expand and deflate. This mechanical action mimics the natural process of breathing for individuals who have lost the ability to control their own diaphragm muscles.",
  "what_it_does_not_cover": [
    "Does not cover positive-pressure ventilators that push air directly into the lungs through a tube.",
    "Does not cover portable or wearable breathing assistance devices.",
    "Does not cover electronic sensors or automated feedback loops for monitoring blood oxygen levels."
  ],
  "filed": "1931-11-27",
  "granted": "1933-05-02",
  "expires": "1951-11-27",
  "status": "expired",
  "holder": "Individual",
  "holder_url": "https://patentbrief.org/company/individual",
  "inventors": [
    {
      "name": "Shaw Louis Agassiz",
      "url": "https://patentbrief.org/inventor/shaw-louis-agassiz"
    },
    {
      "name": "Drinker Philip",
      "url": "https://patentbrief.org/inventor/drinker-philip"
    }
  ],
  "times_cited": 7,
  "tags": [
    "biotech",
    "mechanical"
  ],
  "abstract": null,
  "url": "https://patentbrief.org/patent/us/1906844/iron-lung-respirator-drinker",
  "markdown_url": "https://patentbrief.org/patent/us/1906844/iron-lung-respirator-drinker/md",
  "google_patents_url": "https://patents.google.com/patent/US1906844",
  "relatedPatents": [
    {
      "patentNumber": "3191596",
      "countryCode": "US",
      "title": "How Dr. Forrest Bird's Mechanical Respirator Controls Patient Breathing",
      "url": "https://patentbrief.org/patent/us/3191596/bird-respirator-ventilator"
    },
    {
      "patentNumber": "2702035",
      "countryCode": "US",
      "title": "How the First Heart-Lung Machine Oxygenated Blood",
      "url": "https://patentbrief.org/patent/us/2702035/heart-lung-machine-gibbon"
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    },
    {
      "patentNumber": "1788434",
      "countryCode": "US",
      "title": "Leonarde Keeler's Early Mechanical Blood Pressure Recorder",
      "url": "https://patentbrief.org/patent/us/1788434/polygraph-lie-detector-keeler"
    },
    {
      "patentNumber": "5199424",
      "countryCode": "US",
      "title": "How CPAP Machines Gradually Increase Air Pressure for Sleeping Patients",
      "url": "https://patentbrief.org/patent/us/5199424/cpap-sleep-apnea-sullivan"
    }
  ]
}