{
  "patent_number": "US 1967861",
  "country": "US",
  "title": "How DuPont Invented Neoprene Synthetic Rubber",
  "original_title": "Process of polymerizing chlorobutadiene and resulting product",
  "summary": "A 1934 patent describing the chemical process to turn chlorobutadiene into a durable, oil-resistant synthetic rubber known as Neoprene.",
  "what_it_does": "The patent outlines a chemical process for polymerizing chlorobutadiene, a liquid monomer, into a solid, rubber-like material. By controlling the reaction conditions, the process creates a synthetic elastomer that mimics the properties of natural rubber but offers superior resistance to oils, heat, and weathering. This invention allowed for the mass production of a stable, elastic substance that could be molded or shaped for industrial use.",
  "what_it_does_not_cover": [
    "Does not cover the synthesis of natural rubber derived from latex trees.",
    "Does not cover other types of synthetic rubbers like styrene-butadiene (SBR).",
    "Does not cover the specific vulcanization additives used in finished consumer goods."
  ],
  "filed": "1931-05-14",
  "granted": "1934-07-24",
  "expires": "1951-07-24",
  "status": "expired",
  "holder": "EI Du Pont de Nemours and Co",
  "holder_url": "https://patentbrief.org/company/ei-du-pont-de-nemours-and-co",
  "inventors": [
    {
      "name": "Arnold M Collins",
      "url": "https://patentbrief.org/inventor/arnold-m-collins"
    }
  ],
  "times_cited": 7,
  "tags": [
    "materials",
    "chemical_manufacturing",
    "automotive"
  ],
  "abstract": null,
  "url": "https://patentbrief.org/patent/us/1967861/neoprene-synthetic-rubber",
  "markdown_url": "https://patentbrief.org/patent/us/1967861/neoprene-synthetic-rubber/md",
  "google_patents_url": "https://patents.google.com/patent/US1967861",
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}