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| Number | Title | Issue Date |
| 7255618 | Screw drive vehicle A screw drive vehicle has a main housing with forward and aft ends and first and second lateral sides. A first support arm rotatably supports a first pontoon assembly from the first lateral side of the main housing. A second support arm rotatably supports a second p... | 08/14/2007 |
| 6966807 | Screw drive vehicle A screw drive vehicle has a main housing with forward and aft ends and first and second lateral sides. A first support arm rotatably supports a first pontoon assembly from the first lateral side of the main housing. A second support arm rotatably supports a second p... | 11/22/2005 |
| 5845593 | Man and wind powered aquatic vehicle A non sinkable, easily re-rightable aquatic vehicle has a lightweight body with a front, a rear, a bottom and opposite sides and contains a seat for supporting a pilot. A pair of front sheaves are rotatably mounted to opposite sides of the body near the f... | 12/08/1998 |
| 5807153 | Ice rescue vehicle An ice rescue vehicle used to aid a victim who has fallen through thin ice. The ice rescue vehicle is capable of traveling over ice, water, a broken ice and water mixture, mud, snow and solid ground. The vehicle has a buoyant hollow sled pulled behind a t... | 09/15/1998 |
| 4867716 | Boat The present invention includes a boat having a pair of rotatable elongated pontoons on opposite sides thereof. Each of the pontoons has helical flighting for propelling the boat during rotation of the pontoon. The pontoon also is filled with floatation ma... | 09/19/1989 |
| 4857022 | Amphibious vessel An amphibious vessel has at least two substantially parallel, elongate flotation members (2, 3) which operate on water as hulls. Each flotation members (2, 3) is rotatable about a longitudinal axis thereof so as to be rollable over land. The rotation of o... | 08/15/1989 |
| 4832631 | Swimming aid A manually powered pair of crank operated flat paddles used by a swimmer combines a rotary and paddling motion. One paddle is rotated to engage the water while the opposite paddle is disengaged and provides flotation only. The opposite paddle is then rota... | 05/23/1989 |
| 4726550 | Comprehensive airplane safety system An airplane with an enlarged safety door in the lower middle part of the fuselage which can be opened during mid-flight emergencies so as to let emergency exit stairs be hydraulically lowered down therefrom. The stairs have a hydraulically operated slidew... | 02/23/1988 |
| 4395237 | Amphibious bicycle An amphibious vehicle comprises a bicycle wherein the ends of the front wheel shaft and the rear wheel hub shaft are laterally outwardly projected; a water-surface floating apparatus composed of floats each being provided with a foldable air-tight bag and... | 07/26/1983 |
| 3965843 | Transporting apparatus A device for receiving motive power from a source supported thereon and transmitting the power to the underlying surface thereby imparting motion across such surface to the device and power source supported thereon. The device is particularly adapted for ... | 06/29/1976 |
