{
  "patent_number": "US 4356429",
  "country": "US",
  "title": "How Organic Diodes Make Light Using Special Molecules",
  "original_title": "Organic electroluminescent cell",
  "summary": "Eastman Kodak's 1982 patent on creating light-emitting diodes (OLEDs) using organic materials, specifically a layer of porphyrinic compounds to help inject electrical charges.",
  "what_it_does": "This patent describes how to build a light-emitting device, like a tiny light bulb, using organic materials. It details an 'electroluminescent cell' with a light-producing layer sandwiched between two electrical contacts (an anode and a cathode). The key innovation is adding a special 'hole-injecting zone' made of a porphyrinic compound, like phthalocyanine, right next to the anode. This layer helps electrical 'holes' (think of them as positive charges) move more easily into the light-emitting layer, making the device work better.",
  "what_it_does_not_cover": [
    "Electroluminescent cells that do not use organic materials for the light-emitting zone.",
    "Devices where the hole-injecting zone is not made of a porphyrinic compound.",
    "Cells that lack a distinct hole-injecting zone between the luminescent zone and the anode.",
    "Electroluminescent cells where the binder material has a breakdown field strength below 10^5 volt/cm."
  ],
  "filed": "1980-07-17",
  "granted": "1982-10-26",
  "expires": "2000-07-17",
  "status": "expired",
  "holder": "Eastman Kodak Co",
  "holder_url": "https://patentbrief.org/company/eastman-kodak-co",
  "inventors": [
    {
      "name": "Ching W. Tang",
      "url": "https://patentbrief.org/inventor/ching-w-tang"
    }
  ],
  "times_cited": 1031,
  "tags": [
    "consumer_electronics",
    "semiconductors",
    "materials",
    "telecommunications"
  ],
  "abstract": "An organic electroluminescent cell is disclosed comprising a luminescent zone between two electrodes, wherein a hole-injecting zone comprising a porphyrinic compound is disposed between the luminescent zone and the anode electrode.",
  "url": "https://patentbrief.org/patent/us/4356429/oled-organic-light-emitting-diode",
  "markdown_url": "https://patentbrief.org/patent/us/4356429/oled-organic-light-emitting-diode/md",
  "google_patents_url": "https://patents.google.com/patent/US4356429",
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}