US PATENT SUBCLASS 440 / 49
SCREW PROPELLER

Current as of: June, 1999
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440 /   HD   MARINE PROPULSION

49SCREW PROPELLER {12}
50  DF  .~> Variable pitch
51  DF  .~> Combined with rudder
52  DF  .~> With vibration dampening
53  DF  .~> With means effecting or facilitating movement of propulsion unit or a segment of the propulsion unit (e.g., tilting or steering) {9}
66  DF  .~> Having means to control flow around propeller {3}
71  DF  .~> Propeller guard {1}
73  DF  .~> Self-clearing
74  DF  .~> Shaft braking or locking
75  DF  .~> Having transmission
76  DF  .~> Propulsion unit casing {2}
79  DF  .~> Propeller arrangement {2}
83  DF  .~> Shafting

DEFINITION

Classification: 440/49

SCREW PROPELLER:

(under the class definition) Device consisting of a number of blades so inclined that upon rotation the blades tend to follow a helical path through the water and thereby drive a vessel in a path parallel to the axis of rotation of the blades.

(1) Note. The propellers located here involve more than the structure of the propeller element, per se, or otherwise are

excluded by definition from Class 416, Fluid Reaction Surfaces (i.e., Impellers).