US PATENT SUBCLASS 440 / 12.57
.~.~ Motor driven screw propeller shaft

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}
12.51  DF  .~ Having separated propulsion means for land and water {4}
12.57.~.~ Motor driven screw propeller shaft {2}
12.58  DF  .~.~.~> By flexible endless member (e.g., belt, chain)
12.59  DF  .~.~.~> By gearing {2}

DEFINITION

Classification: 440/12.57

Motor driven screw propeller shaft:

(under subclass 12.51) Subject matter wherein the means for moving the vehicle under its own power includes (a) a device which converts either nonmechanical(e.g., electrical) or stored energy (e.g., fuels) into mechanical energy (i.e.,

motor), and (b) wherein the mechanical energy rotates a long generally cylindrical slender element having connected to it a number of blades so inclined that upon rotation the blades tend to follow a helical path through the water and thereby drive the vehicle in a path parallel to the axis of rotation of the blades.

SEE OR SEARCH THIS CLASS, SUBCLASS:

49+, for screw propeller-type marine propulsion, per se.