{
  "patent_number": "US 644077",
  "country": "US",
  "title": "How Felix Hoffmann Invented Aspirin",
  "original_title": "Acetyl salicylic acid.",
  "summary": "The 1900 patent for acetylsalicylic acid, the chemical compound that became the world's most common pain reliever, known as Aspirin.",
  "what_it_does": "This patent describes the chemical process for creating acetylsalicylic acid. It involves reacting salicylic acid with acetic anhydride to produce a stable, usable form of the drug. By acetylating the salicylic acid, the inventor created a compound that was significantly less irritating to the stomach than the raw salicylic acid used previously for pain and inflammation.",
  "what_it_does_not_cover": [
    "Does not cover the natural source of salicylic acid found in willow bark.",
    "Does not cover other non-acetylated derivatives of salicylic acid.",
    "Does not cover the specific brand name Aspirin, which was a trademarked term."
  ],
  "filed": "1898-08-01",
  "granted": "1900-02-27",
  "expires": "1918-07-31",
  "status": "expired",
  "holder": "FARBENFABRIKEN OF ELBERFELD Co",
  "holder_url": "https://patentbrief.org/company/farbenfabriken-of-elberfeld-co",
  "inventors": [
    {
      "name": "Felix Hoffmann",
      "url": "https://patentbrief.org/inventor/felix-hoffmann"
    }
  ],
  "times_cited": 6,
  "tags": [
    "pharmaceutical"
  ],
  "abstract": null,
  "url": "https://patentbrief.org/patent/us/644077/aspirin-acetylsalicylic-acid",
  "markdown_url": "https://patentbrief.org/patent/us/644077/aspirin-acetylsalicylic-acid/md",
  "google_patents_url": "https://patents.google.com/patent/US644077",
  "relatedPatents": [
    {
      "patentNumber": "319082",
      "countryCode": "US",
      "title": "How Constantin Fahlberg Discovered Saccharin",
      "url": "https://patentbrief.org/patent/us/319082/saccharin-artificial-sweetener-fahlberg"
    },
    {
      "patentNumber": "4231938",
      "countryCode": "US",
      "title": "The Discovery of Lovastatin for Lowering Cholesterol",
      "url": "https://patentbrief.org/patent/us/4231938/statin-cholesterol-lovastatin"
    },
    {
      "patentNumber": "3492131",
      "countryCode": "US",
      "title": "The Discovery of Aspartame as a Sugar Substitute",
      "url": "https://patentbrief.org/patent/us/3492131/aspartame-sweetener"
    },
    {
      "patentNumber": "2744122",
      "countryCode": "US",
      "title": "The Chemical Discovery Behind the First Oral Contraceptive Pill",
      "url": "https://patentbrief.org/patent/us/2744122/birth-control-pill-norethindrone"
    },
    {
      "patentNumber": "2130523",
      "countryCode": "US",
      "title": "How Wallace Carothers Invented Nylon",
      "url": "https://patentbrief.org/patent/us/2130523/nylon-polyamide-carothers"
    }
  ]
}