3423521

Information

• Patent Grant
• 3423521

• References
• Source

• Patent Number

  3,423,521

• Date Filed

  Not available

• Date Issued

  Tuesday, January 21, 1969
  55 years ago

• CPC

  • H04N7/183 - for receiving images from a single remote source
  • H04M11/027 - Annunciator systems for hospitals

• US Classifications

  • 725 - Interactive video distribution systems
  • 340 - Communications: electrical
  • 348 - Television