{
  "patent_number": "US 879532",
  "country": "US",
  "title": "Lee De Forest's Early Radio Telegraphy System",
  "original_title": "Space telegraphy.",
  "summary": "A 1908 patent by radio pioneer Lee De Forest describing methods for transmitting and receiving wireless telegraphy signals using early vacuum tube technology.",
  "what_it_does": "This patent details a system for space telegraphy, which was the early term for wireless radio communication. It focuses on the hardware arrangement for generating and detecting electromagnetic waves across distances. By utilizing early components that would eventually evolve into the triode vacuum tube, the system allowed for the modulation of electrical signals to transmit information wirelessly through the air.",
  "what_it_does_not_cover": [
    "Does not cover modern digital signal processing or binary data transmission.",
    "Does not cover the later invention of the Audion triode amplifier itself, which was patented separately.",
    "Does not cover satellite-based communication systems or modern cellular networks."
  ],
  "filed": "1907-01-29",
  "granted": "1908-02-18",
  "expires": "1927-01-29",
  "status": "expired",
  "holder": "FOREST RADIO TELEPHONE CO DE",
  "holder_url": "https://patentbrief.org/company/forest-radio-telephone-co-de",
  "inventors": [
    {
      "name": "Lee De Forest",
      "url": "https://patentbrief.org/inventor/lee-de-forest"
    }
  ],
  "times_cited": 2,
  "tags": [
    "telecommunications",
    "semiconductors"
  ],
  "abstract": null,
  "url": "https://patentbrief.org/patent/us/879532/de-forest-audion-vacuum-tube",
  "markdown_url": "https://patentbrief.org/patent/us/879532/de-forest-audion-vacuum-tube/md",
  "google_patents_url": "https://patents.google.com/patent/US879532",
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}