3421579

Information

• Patent Grant
• 3421579

• References
• Source

• Patent Number

  3,421,579

• Date Filed

  Not available

• Date Issued

  Tuesday, January 14, 1969
  56 years ago

• CPC

  • E21B33/037 - Protective housing therefor
  • E21B33/0375 - Corrosion protection means
  • E21B41/06 - Work chambers for underwater operations

• US Classifications

  • 166 - Wells
  • 405 - Hydraulic and earth engineering