US PATENT SUBCLASS 440 / 12.65
.~ Helical screw propulsion means

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

12.5  DF  SELF-PROPELLED VEHICLE HAVING LAND AND WATER PROPULSION MEANS (E.G., AMPHIBIOUS VEHICLE) {5}
12.65.~ Helical screw propulsion means

DEFINITION

Classification: 440/12.65

Helical screw propulsion means:

(under subclass 12.5) Subject matter wherein the means for moving the vehicle under its own power includes blades which encircle a hub and form a spiral along the length of the rotational axis of the hub (e.g., Archimedes screw).