{
  "patent_number": "US 2824789",
  "country": "US",
  "title": "How the Breathalyzer Measures Alcohol in Your Breath",
  "original_title": "Apparatus for analyzing a gas",
  "summary": "A 1954 invention by Robert Borkenstein that uses a chemical reaction to estimate the amount of alcohol in a person's blood by testing their breath.",
  "what_it_does": "The device captures a specific volume of a person's breath and passes it through a chemical solution containing potassium dichromate and sulfuric acid. If alcohol is present in the breath, it reacts with the solution, causing a color change from orange to green. The device then uses a photoelectric cell to measure the intensity of this color change, which correlates to the concentration of alcohol in the breath and, by extension, the bloodstream.",
  "what_it_does_not_cover": [
    "Does not cover modern digital fuel cell or infrared spectroscopy breath testing technology.",
    "Does not cover methods for testing alcohol concentration directly from blood or urine samples.",
    "Does not cover automated data logging or wireless transmission of test results."
  ],
  "filed": "1954-05-10",
  "granted": "1958-02-25",
  "expires": "1975-02-25",
  "status": "expired",
  "holder": "Individual",
  "holder_url": "https://patentbrief.org/company/individual",
  "inventors": [
    {
      "name": "Robert F Borkenstein",
      "url": "https://patentbrief.org/inventor/robert-f-borkenstein"
    }
  ],
  "times_cited": 8,
  "tags": [
    "consumer_electronics",
    "mechanical"
  ],
  "abstract": null,
  "url": "https://patentbrief.org/patent/us/2824789/breathalyzer-borkenstein",
  "markdown_url": "https://patentbrief.org/patent/us/2824789/breathalyzer-borkenstein/md",
  "google_patents_url": "https://patents.google.com/patent/US2824789",
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}