1747394

Information

• Patent Grant
• 1747394

• References
• Source

• Patent Number

  1,747,394

• Date Filed

  Not available

• Date Issued

  Tuesday, February 18, 1930
  94 years ago

• CPC

  • E21B10/22 - characterised by bearing, lubrication or sealing details
  • E21B10/08 - Roller bits
  • F16C33/12 - Structural composition Use of special materials or surface treatments
  • F16C2204/40 - Alloys based on refractory metals
  • F16C2204/44 - Alloys based on chromium
  • F16C2223/46 - by welding
  • F16C2352/00 - Apparatus for drilling
  • Y10T29/49705 - Coating or casting
  • Y10T29/49709 - Specific metallic composition

• US Classifications

  • 384 - Bearings
  • 029 - Metal working