US PATENT SUBCLASS 244 / 17.11
.~ Helicopter or auto-rotating wing sustained, i.e., gyroplanes

Current as of: June, 1999
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244 /   HD   AERONAUTICS

4 R  DF  AIRCRAFT, HEAVIER-THAN-AIR {14}
17.11.~ Helicopter or auto-rotating wing sustained, i.e., gyroplanes {7}
17.13  DF  .~.~> Automatic or condition responsive control
17.15  DF  .~.~> With safety lowering device
17.17  DF  .~.~> With landing, mooring, or nonaerial propelling or steering gear
17.19  DF  .~.~> With auxiliary propulsion, counter-troque or steering device {1}
17.23  DF  .~.~> Having plural lifting rotors
17.25  DF  .~.~> Lifting rotor having lift direction varying means
17.27  DF  .~.~> Lifting rotor supports, e.g., pylons

DEFINITION

Classification: 244/17.11

(under subclass 4) Aircraft which are sustained in the air by a thrust produced by one or more wings or blades rotating about a substantially vertical axis.

(1) Note. This type of aircraft is technically called a gyroplane and includes (1) helicopters, wherein the wings or blades are normally mechanically driven, and (2) the autorotating wing type, e.g., "Autogiro", wherein the wings or blades rotate because of the aerodynamic forces acting on them due to the forward speed of the aircraft, the forward motion being caused by a tractor impeller, jet or other propulsion means.

(2) Note. The rotary wing may be provided with modifying means whereby the thrust is varied in intensity or direction.

(3) Note. This subclass and indented subclasses provide for a rotary wing which is significantly combined with the aircraft, i.e., when more structure of the aircraft is recited than is necessary to mount the propulsion or steering means. In the following instances, the aircraft is considered to be significantly recited: (a) Mounting or attachment of a motor or power plant to the frame or body in a particular relation or location with respect to the body. (b) The impeller drive gearing or shaft is located in a specific relation to the aircraft.

SEE OR SEARCH THIS CLASS, SUBCLASS:

6, 7 and 8, for aircraft having a fixed wing in addition to the rotating wing for sustentation. SEE OR SEARCH CLASS

416, Fluid Reaction Surfaces (i.e., Impellers), appropriate subclasses, particularly subclasses such as 20+, 87+ and 98+ for the rotor, per se.

446, Amusement Devices: Toys,

36+, for toy "Autogiros" or helicopters.