1500639

Information

• Patent Grant
• 1500639

• References
• Source

• Patent Number

  1,500,639

• Date Filed

  Not available

• Date Issued

  Tuesday, July 8, 1924
  100 years ago

• CPC

  • F21V29/503 - of light sources
  • F21S6/006 - for direct lighting only
  • F21V21/20 - operated by weights
  • F21V29/004 - Natural cooling
  • F21V29/83 - the elements having apertures, ducts or channels

• US Classifications

  • 362 - Illumination