{
  "patent_number": "US 1141798",
  "country": "US",
  "title": "Early Car Wheel Traction Device",
  "original_title": "Vehicle-scotch.",
  "summary": "A 1915 patent for a metal device clamped to a car wheel to improve traction on slippery surfaces.",
  "what_it_does": "This patent describes a device designed to wrap around a vehicle's wheel, specifically to provide better grip on roads covered in snow, ice, or mud. It consists of a flexible metal band that encircles the tire. Attached to this band are cross-members, essentially metal bars or plates, that extend outward from the wheel's circumference. When the wheel rotates, these cross-members dig into the slippery surface, preventing the tire from spinning freely and helping the vehicle move forward. The patent claims a 'vehicle-scotch' comprising a flexible band and 'cleats' or cross-members for traction.",
  "what_it_does_not_cover": [
    "Does not cover tire chains that are a continuous loop around the tire.",
    "Does not cover devices that attach to the vehicle's chassis instead of the wheel.",
    "Does not cover pneumatic tires with specialized tread patterns.",
    "Does not cover the use of sand or other loose materials for traction.",
    "Does not cover devices that are permanently affixed to the wheel rim."
  ],
  "filed": "1914-10-31",
  "granted": "1915-06-01",
  "expires": "1934-10-31",
  "status": "expired",
  "holder": "Individual",
  "holder_url": "https://patentbrief.org/company/individual",
  "inventors": [
    {
      "name": "John H Holt",
      "url": "https://patentbrief.org/inventor/john-h-holt"
    }
  ],
  "times_cited": 0,
  "tags": [
    "automotive",
    "mechanical"
  ],
  "abstract": null,
  "url": "https://patentbrief.org/patent/us/1141798/zipper-slide-fastener",
  "markdown_url": "https://patentbrief.org/patent/us/1141798/zipper-slide-fastener/md",
  "google_patents_url": "https://patents.google.com/patent/US1141798",
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}