3727003

Information

• Patent Grant
• 3727003

• References
• Source

• Patent Number

  3,727,003

• Date Filed

  Not available

• Date Issued

  Tuesday, April 10, 1973
  51 years ago

• CPC

  • H04M1/573 - Line monitoring circuits for detecting caller identification
  • H04Q1/32 - using trains of dc pulses

• US Classifications

  • 178 - Telegraphy
  • 345 - Computer graphics processing and selective visual display systems
  • 379 - Telephonic communications