1764332

Information

• Patent Grant
• 1764332

• References
• Source

• Patent Number

  1,764,332

• Date Filed

  Not available

• Date Issued

  Tuesday, June 17, 1930
  94 years ago

• CPC

  • H04Q9/06 - Calling by using amplitude or polarity of dc
  • Y10T307/729 - Condition responsive
  • Y10T307/735 - Attainment of voltage, frequency or phase relationship

• US Classifications

  • 307 - Electrical transmission or interconnection systems
  • 318 - Electricity: motive power systems