3621138

Information

• Patent Grant
• 3621138

• References
• Source

• Patent Number

  3,621,138

• Date Filed

  Not available

• Date Issued

  Tuesday, November 16, 1971
  53 years ago

• CPC

  • H04L21/04 - at the receiving end
  • B41J2/447 - using arrays of radiation sources

• US Classifications

  • 178 - Telegraphy
  • 347 - Incremental printing of symbolic information
  • 359 - Optical: systems and elements