1997478

Information

• Patent Grant
• 1997478

• References
• Source

• Patent Number

  1,997,478

• Date Filed

  Not available

• Date Issued

  Tuesday, April 9, 1935
  89 years ago

• CPC

  • H01J17/28 - Cooling arrangements

• US Classifications

  • 313 - Electric lamp and discharge devices
  • 165 - Heat exchange
  • 174 - Electricity: conductors and insulators