3221120

Information

• Patent Grant
• 3221120

• References
• Source

• Patent Number

  3,221,120

• Date Filed

  Not available

• Date Issued

  Tuesday, November 30, 1965
  59 years ago

• CPC

  • H04W88/027 - using frequency address codes
  • H01H51/32 - Frequency relays Mechanically-tuned relays
  • H04B1/1638 - Special circuits to enhance selectivity of receivers not otherwise provided for
  • H04L27/26 - Systems using multi-frequency codes

• US Classifications

  • 335 - Electricity: magnetically operated switches, magnets, and electromagnets
  • 200 - Electricity: circuit makers and breakers
  • 310 - Electrical generator or motor structure
  • 331 - Oscillators