2781666

Information

• Patent Grant
• 2781666

• References
• Source

• Patent Number

  2,781,666

• Date Filed

  Not available

• Date Issued

  Tuesday, February 19, 1957
  67 years ago

• CPC

  • G03C5/02 - Sensitometric processes
  • H04M1/31 - by interrupting current to generate trains of pulses by periodically opening and closing contacts to generate trains of pulses
  • H04M1/32 - Locking setting devices during transmission to prevent interference by user
  • H04M15/10 - Metering calls from calling party
  • H04M17/02 - Coin-freed or check-freed systems
  • H04M17/026 - Constructional features
  • Y10T74/1571 - Cooperating holding pawl
  • Y10T74/1574 - Cooperating holding pawl
  • Y10T74/2135 - Noiseless

• US Classifications

  • 074 - Machine element or mechanism
  • 379 - Telephonic communications