3356958

Information

• Patent Grant
• 3356958

• References
• Source

• Patent Number

  3,356,958

• Date Filed

  Not available

• Date Issued

  Tuesday, December 5, 1967
  57 years ago

• CPC

  • H04M19/02 - providing ringing current or supervisory tones
  • Y10T307/565 - Fixed or predetermined ratio

• US Classifications

  • 330 - Amplifiers
  • 307 - Electrical transmission or interconnection systems
  • 323 - Electricity: power supply or regulation systems
  • 379 - Telephonic communications