2177685

Information

• Patent Grant
• 2177685

• References
• Source

• Patent Number

  2,177,685

• Date Filed

  Not available

• Date Issued

  Tuesday, October 31, 1939
  85 years ago

• CPC

  • C03C27/044 - of glass, glass-ceramic or ceramic material only
  • H01J5/38 - Pinched-stem or analogous seals

• US Classifications

  • 174 - Electricity: conductors and insulators
  • 065 - Glass manufacturing
  • 313 - Electric lamp and discharge devices
  • 501 - Compositions: ceramic