3803722

Information

• Patent Grant
• 3803722

• References
• Source

• Patent Number

  3,803,722

• Date Filed

  Not available

• Date Issued

  Tuesday, April 16, 1974
  50 years ago

• CPC

  • B25H1/0085 - by means of levels
  • E21B45/00 - Measuring the drilling time or rate of penetration
  • E21B47/02232 - using a pendulum
  • G01C9/00 - Measuring inclination

• US Classifications

  • 033 - Geometrical instruments