3200205

Information

• Patent Grant
• 3200205

• References
• Source

• Patent Number

  3,200,205

• Date Filed

  Not available

• Date Issued

  Tuesday, August 10, 1965
  58 years ago

• CPC

  • H04M1/50 - by generating or selecting currents of predetermined frequencies or combinations of frequencies
  • H04Q1/4535 - with an additional signal transmitted for voice protection

• US Classifications

  • 379 - Telephonic communications