3908453

Information

• Patent Grant
• 3908453

• References
• Source

• Patent Number

  3,908,453

• Date Filed

  Not available

• Date Issued

  Tuesday, September 30, 1975
  49 years ago

• CPC

  • E21B47/02232 - using a pendulum
  • E21B47/06 - Measuring temperature or pressure
  • E21B47/18 - through the well fluid
  • E21B47/182 - by continuous mud waves with modulation of the waves
  • E21B47/187 - by positive mud pulses using a flow restricting valve within the drill pipe

• US Classifications

  • 073 - Measuring and testing
  • 367 - Communications, electrical: acoustic wave systems and devices