{
  "patent_number": "US 2956114",
  "country": "US",
  "title": "How Ampex Invented Modern Video Recording on Magnetic Tape",
  "original_title": "Broad band magnetic tape system and method",
  "summary": "This 1955 invention enabled the recording of high-frequency television signals onto magnetic tape, replacing the expensive and low-quality film recording methods of the era.",
  "what_it_does": "The system uses a rotating head assembly that spins at high speeds perpendicular to the direction of the moving magnetic tape. By scanning the tape transversely, the system achieves the high relative speeds necessary to capture the massive amount of data required for a television signal. This allows for the storage of high-frequency video information on a relatively slow-moving strip of tape. It effectively solved the problem of how to record a signal that required a bandwidth far beyond what stationary heads could handle at the time.",
  "what_it_does_not_cover": [
    "Does not cover digital video recording or compression formats.",
    "Does not cover helical scan recording, which uses a different tape path geometry.",
    "Does not cover optical disc storage or solid-state memory."
  ],
  "filed": "1955-07-25",
  "granted": "1960-10-11",
  "expires": "1977-10-11",
  "status": "expired",
  "holder": "Ampex Corp",
  "holder_url": "https://patentbrief.org/company/ampex-corp",
  "inventors": [
    {
      "name": "Charles P Ginsburg",
      "url": "https://patentbrief.org/inventor/charles-p-ginsburg"
    },
    {
      "name": "Jr Shelby F Henderson",
      "url": "https://patentbrief.org/inventor/jr-shelby-f-henderson"
    },
    {
      "name": "Ray M Dolby",
      "url": "https://patentbrief.org/inventor/ray-m-dolby"
    },
    {
      "name": "Charles E Anderson",
      "url": "https://patentbrief.org/inventor/charles-e-anderson"
    }
  ],
  "times_cited": 11,
  "tags": [
    "consumer_electronics",
    "mechanical",
    "telecommunications"
  ],
  "abstract": null,
  "url": "https://patentbrief.org/patent/us/2956114/videotape-recorder-ampex",
  "markdown_url": "https://patentbrief.org/patent/us/2956114/videotape-recorder-ampex/md",
  "google_patents_url": "https://patents.google.com/patent/US2956114",
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}