2178471

Information

• Patent Grant
• 2178471

• References
• Source

• Patent Number

  2,178,471

• Date Filed

  Not available

• Date Issued

  Tuesday, October 31, 1939
  85 years ago

• CPC

  • G01L23/32 - Apparatus specially adapted for recording pressure changes measured by indicators
  • G01L9/12 - by making use of variation in capacitance
  • G01L23/125 - by changing capacitance

• US Classifications

  • 073 - Measuring and testing
  • 178 - Telegraphy
  • 324 - Electricity: measuring and testing
  • 330 - Amplifiers