3676580

Information

• Patent Grant
• 3676580

• References
• Source

• Patent Number

  3,676,580

• Date Filed

  Not available

• Date Issued

  Tuesday, July 11, 1972
  52 years ago

• CPC

  • H04Q9/12 - using combinations of frequencies
  • H04N7/17327 - with deferred transmission or handling of upstream communications
  • H04N2007/17372 - the upstream transmission being initiated or timed by a signal from upstream of the user terminal
  • H04N2007/1739 - the upstream communication being transmitted via a separate link

• US Classifications

  • 725 - Interactive video distribution systems
  • 348 - Television