497838

Information

• Patent Grant
• 497838

• References
• Source

• Patent Number

  497,838

• Date Filed

  Not available

• Date Issued

  Tuesday, May 23, 1893
  131 years ago

• CPC

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

• US Classifications

  • 361 - Electricity: electrical systems and devices