Rotary Wing, I.e., Lift During Horizontal Flight Maintained By Moving Airfoil Patents (Class D12/327)
Plural horizontal rotors (Class D12/328)
  • Helicopter body
    Patent number: D264329
    Type: Grant
    Filed: February 2, 1979
    Date of Patent: May 11, 1982
    Inventor: Edward G. Folks
  • Helicopter
    Patent number: D270151
    Type: Grant
    Filed: October 14, 1980
    Date of Patent: August 16, 1983
    Assignee: United Technologies Corp.
    Inventor: Andrew Whyte
  • Helicopter
    Patent number: D271390
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: November 15, 1983
    Inventor: Buford J. Schramm