3839603

Information

• Patent Grant
• 3839603

• References
• Source

• Patent Number

  3,839,603

• Date Filed

  Not available

• Date Issued

  Tuesday, October 1, 1974
  50 years ago

• CPC

  • H03H7/065 - Parallel T-filters
  • H04M19/026 - Arrangements for interrupting the ringing current
  • H04Q1/30 - Signalling arrangements Manipulation of signalling currents

• US Classifications

  • 379 - Telephonic communications