2990139

Information

• Patent Grant
• 2990139

• References
• Source

• Patent Number

  2,990,139

• Date Filed

  Not available

• Date Issued

  Tuesday, June 27, 1961
  63 years ago

• CPC

  • B64C39/005 - about a horizontal transversal axis
  • B64C11/006 - Paddle wheels

• US Classifications

  • 244 - Aeronautics and astronautics
  • 416 - Fluid reaction surfaces