{
  "patent_number": "US 2817025",
  "country": "US",
  "title": "How the First Wireless Television Remote Control Works",
  "original_title": "Control system",
  "summary": "Robert Adler's 1957 invention of the Space Command remote, which used ultrasonic sound waves to control television functions without wires or batteries.",
  "what_it_does": "The patent describes a remote control system that uses ultrasonic sound pulses to trigger specific functions on a television set. The remote contains mechanical hammers that strike aluminum rods of different lengths when a button is pressed, creating high-frequency sound waves above the range of human hearing. A microphone on the television receiver captures these specific frequencies, which are then converted into electrical signals to perform actions like changing channels or adjusting volume.",
  "what_it_does_not_cover": [
    "Does not cover infrared (IR) remote controls, which use light pulses rather than sound waves.",
    "Does not cover Bluetooth or Wi-Fi based remote controls.",
    "Does not cover systems that require a direct electrical wire connection between the remote and the TV.",
    "Does not cover digital signal processing or complex data transmission protocols."
  ],
  "filed": "1957-08-05",
  "granted": "1957-12-17",
  "expires": "1977-08-05",
  "status": "expired",
  "holder": "Zenith Radio Corp",
  "holder_url": "https://patentbrief.org/company/zenith-radio-corp",
  "inventors": [
    {
      "name": "Adler Robert",
      "url": "https://patentbrief.org/inventor/adler-robert"
    }
  ],
  "times_cited": 30,
  "tags": [
    "consumer_electronics",
    "mechanical"
  ],
  "abstract": null,
  "url": "https://patentbrief.org/patent/us/2817025/tv-remote-control-adler-zenith",
  "markdown_url": "https://patentbrief.org/patent/us/2817025/tv-remote-control-adler-zenith/md",
  "google_patents_url": "https://patents.google.com/patent/US2817025",
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}