Class Information
Number: D12/328
Name: Transportation > Aircraft, spacecraft, or fuselage > Vertical takeoff type > Rotary wing, i.e., lift during horizontal flight maintained by moving airfoil > Plural horizontal rotors
Description:
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| D465196 |
Four propeller helicopter |
Nov. 5, 2002 |
| D453317 |
Quad tiltrotor |
Feb. 5, 2002 |
| D425853 |
Helicopter |
May. 30, 2000 |
| D401898 |
Variable diameter tilt rotor aircraft |
Dec. 1, 1998 |
| D394422 |
Tilt rotor aircraft |
May. 19, 1998 |
| D388048 |
Helicopter |
Dec. 23, 1997 |
| D361053 |
Helicopter |
Aug. 8, 1995 |
| D357894 |
Helicopter |
May. 2, 1995 |
| D335119 |
Gyroplane |
Apr. 27, 1993 |
| D323315 |
Dual mode air vehicle |
Jan. 21, 1992 |
| D317287 |
Dual mode air vehicle |
Jun. 4, 1991 |
| D311719 |
Aircraft |
Oct. 30, 1990 |
| 4768737 |
Helicopter control system |
Sep. 6, 1988 |
| D293430 |
Peristrophic-wing air craft |
Dec. 29, 1987 |
| 4296892 |
Spherical living module or space |
Oct. 27, 1981 |
|
