423788

Information

• Patent Grant
• 423788

• References
• Source

• Patent Number

  423,788

• Date Filed

  Not available

• Date Issued

  Tuesday, March 18, 1890
  134 years ago

• CPC

  • H02H7/24 - for spark-gap arresters
  • H04M1/745 - Protection devices or circuits for voltages surges on the line

• US Classifications

  • 361 - Electricity: electrical systems and devices
  • 313 - Electric lamp and discharge devices