3587076

Information

• Patent Grant
• 3587076

• References
• Source

• Patent Number

  3,587,076

• Date Filed

  Not available

• Date Issued

  Tuesday, June 22, 1971
  53 years ago

• CPC

  • H04Q9/06 - Calling by using amplitude or polarity of dc
  • E21B47/06 - Measuring temperature or pressure
  • E21B47/12 - Means for transmitting measuring-signals or control signals from the well to the surface or from the surface to the well

• US Classifications

  • 340 - Communications: electrical