3878340

Information

• Patent Grant
• 3878340

• References
• Source

• Patent Number

  3,878,340

• Date Filed

  Not available

• Date Issued

  Tuesday, April 15, 1975
  49 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