1821871

Information

• Patent Grant
• 1821871

• References
• Source

• Patent Number

  1,821,871

• Date Filed

  Not available

• Date Issued

  Tuesday, September 1, 1931
  93 years ago

• CPC

  • G01N25/385 - for investigating the composition of gas mixtures

• US Classifications

  • 337 - Electricity: electrothermally or thermally actuated switches
  • 340 - Communications: electrical