{
  "patent_number": "US 2713176",
  "country": "US",
  "title": "How a Simple Felt-Tip Marker Works",
  "original_title": "Marking device",
  "summary": "A 1953 design for a handheld marking tool that uses a porous tip to deliver ink from an internal reservoir.",
  "what_it_does": "The device functions as a primitive felt-tip marker. It consists of a hollow body that acts as an ink reservoir, containing a fibrous material saturated with marking fluid. A porous tip is held in contact with this reservoir, allowing ink to flow through the fibers via capillary action onto a surface. The design ensures a steady, controlled release of ink for writing or drawing.",
  "what_it_does_not_cover": [
    "Does not cover markers using pressurized ink delivery systems.",
    "Does not cover pens that use ball-point rolling mechanisms.",
    "Does not cover electronic or digital marking devices."
  ],
  "filed": "1953-04-22",
  "granted": "1955-07-19",
  "expires": "1973-04-22",
  "status": "expired",
  "holder": "Individual",
  "holder_url": "https://patentbrief.org/company/individual",
  "inventors": [
    {
      "name": "Sidney N Rosenthal",
      "url": "https://patentbrief.org/inventor/sidney-n-rosenthal"
    }
  ],
  "times_cited": 13,
  "tags": [
    "mechanical",
    "consumer_electronics"
  ],
  "abstract": null,
  "url": "https://patentbrief.org/patent/us/2713176/magic-marker-permanent-marker-rosenthal",
  "markdown_url": "https://patentbrief.org/patent/us/2713176/magic-marker-permanent-marker-rosenthal/md",
  "google_patents_url": "https://patents.google.com/patent/US2713176",
  "relatedPatents": [
    {
      "patentNumber": "3055113",
      "countryCode": "US",
      "title": "Early Device for Tracking Objects with a Pen",
      "url": "https://patentbrief.org/patent/us/3055113/etch-a-sketch"
    },
    {
      "patentNumber": "293545",
      "countryCode": "US",
      "title": "How Lewis Waterman's Original Fountain Pen Design Worked",
      "url": "https://patentbrief.org/patent/us/293545/fountain-pen-waterman"
    },
    {
      "patentNumber": "2620061",
      "countryCode": "US",
      "title": "How a Spring-Loaded Pocket Dispenser Works",
      "url": "https://patentbrief.org/patent/us/2620061/pez-dispenser"
    },
    {
      "patentNumber": "2390636",
      "countryCode": "US",
      "title": "How Laszlo Biro Invented the Modern Ballpoint Pen",
      "url": "https://patentbrief.org/patent/us/2390636/ballpoint-pen-biro"
    },
    {
      "patentNumber": "2331117",
      "countryCode": "US",
      "title": "How the First Aerosol Spray Can Works",
      "url": "https://patentbrief.org/patent/us/2331117/aerosol-spray-can-goodhue"
    }
  ]
}