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Boat Propeller Inventions & Patents
From Clixoo Boats – The Boats Guide @ Clixoo
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Boat Propeller Inventions & Patents
See Boat Patents Section of Clixoo Boats for all Boat Patent Resources
Boat Propeller
1 Boat propeller guard - A guard for protection of an outboard motor is described. Patent number: 4565533 Filing date: Oct 26, 1983 Issue date: Jan 21, 1986
2 Boat propeller - Improved screw propellers especially useful in the propulsion of small boats are constructed at low cost from cast iron characterized by rounded graphite in a ferritic, pearlitic and/or acicular matrix. Patent number: 4767278 Filing date: Oct 6, 1981 Issue date: Aug 30, 1988
3 Boat propeller - A boat propeller comprising a central hub member and an inner hub assembly that defines a longitudinally extending bore having an inner surface. Patent number: 7223073 Filing date: May 19, 2005 Issue date: May 29, 2007
4 Boat propeller
Patent number: D368886 Filing date: Dec 19, 1994 Issue date: Apr 16, 1996
5 Boat propeller - A ship propeller arrangement, in particular for motor boats, has a propeller being operated with super-cavitative rotating speed Patent number: 5046973 Filing date: Apr 5, 1989 Issue date: Sep 10, 1991
6 Boat propeller having counter-rotating screws and provided with a nozzle - A screw propeller for boats includes two counter-rotating screws coaxial with an annular nozzle. Patent number: 4832570 Filing date: Jul 1, 1988 Issue date: May 23, 1989
7 Propeller combination for a boat propeller unit - The invention relates to a boat propeller unit with double, counter-rotating propellers. Patent number: 4741670 Filing date: Sep 12, 1986 Issue date: May 3, 1988
8 Boat propeller case and lock - A case and lock for reducing damage and deterring theft of boat propellers. Patent number: 5469721 Filing date: Mar 25, 1994 Issue date: Nov 28, 1995
9 Boat propeller cover - A locking boat propeller cover that completely encloses the propeller. Patent number: 5246345 Filing date: Oct 7, 1992 Issue date: Sep 21, 1993
10 Counter-rotating boat propeller drive - A dual boat propeller structure is described for counter-rotation of the propellers. Patent number: 5017168 Filing date: Mar 12, 1990 Issue date: May 21, 1991
11 Boat propeller guard - The propeller guard described herein is designed primarily for the protection of manatee but is also useful in protection against injury to other animals and larger fish which might come in contact with a boat's propeller. Patent number: 5066254 Filing date: Feb 12, 1990 Issue date: Nov 19, 1991
12 Boat propeller - A boat propeller includes a hub having a front, back, and an axis of revolution extending there between. Patent number: 7025642 Filing date: Sep 16, 2004 Issue date: Apr 11, 2006
13 Rotor system, particularly a boat propeller system - The invention relates to a rotor system, particularly a boat propeller system, which consists of a main propeller and a turbo unit in the form of a fore-propeller and a turbine mechanically coupled thereto, the turbo unit being freely rotatably journalled. Patent number: 4767269 Filing date: Nov 26, 1985 Issue date: Aug 30, 1988
14 Replaceable and foldable blade boat propeller - A boat propeller wherein the blades are easily removable from the propeller hub. Patent number: 5372480 Filing date: Sep 22, 1993 Issue date: Dec 13, 1994
15 Control system for variable-pitch boat propeller - A marine drive has a propeller rotatable about a drive axis and having a plurality of blades. Patent number: 5415523 Filing date: Sep 23, 1993 Issue date: May 16, 1995
16 Folding boat propeller - A boat propeller with foldable blades, a so-called folding propeller. Patent number: 4364711 Filing date: Jan 13, 1981 Issue date: Dec 21, 1982
17 Boat propeller drive unit with trim/tilt sensor - A boat propeller drive unit, a so-called inboard-outboard drive unit, has a sensor which senses the trim/tilting angle of the drive unit and is designed to be connected to an electrical indicator instrument on the boat instrument panel. Patent number: 4624643 Filing date: Sep 18, 1984 Issue date: Nov 25, 1986
18 Tilt cylinder apparatus for boat propeller unit - A tilt cylinder apparatus for a boat propeller unit comprising a cylinder unit containing an inside cylinder and an outside cylinder, an opening portion of the cylinders being closed by rod guides, a piston.
Patent number: 5876259 Filing date: Oct 31, 1997 Issue date: Mar 2, 1999
19 Boat propeller shield system - A boat propeller shield system for protecting a propeller from damage and humans from injury. Patent number: 6916217 Filing date: Mar 12, 2004 Issue date: Jul 12, 2005
20 Emergency enablement device for a boat propeller - Disclosed is an apparatus for emergency enablement of a boat propeller. Patent number: 5573372 Filing date: Jun 3, 1994 Issue date: Nov 12, 1996
21 Boat propeller drive unit - A boat propeller drive unit of the inboard-outboard type, having a portion securely mounted in an opening in a boat transom. Patent number: 4741713 Filing date: Sep 17, 1986 Issue date: May 3, 1988
22 Slip inhibiting boat propeller - Efficiency of a boat propeller is increased by curved flanges extending along the tips of the propeller blades. Patent number: 6352408 Filing date: Oct 16, 2000 Issue date: Mar 5, 2002
23 Weed resistant boat propeller - A weed resistant boat propeller is disclosed. Patent number: 5249993 Filing date: Jul 19, 1991 Issue date: Oct 5, 1993
24 Boat propeller drive unit - In an outboard drive unit for boats, the drive shaft housing is swingable by hydraulic cylinders for trimming and tilting.
Patent number: 4589850 Filing date: Sep 18, 1984 Issue date: May 20, 1986
25 Universal constant speed variable pitch boat propeller system - An adjustable pitch boat propeller system adapted for mounting on a drive shaft of a marine drive unit of a boat. Patent number: 6358007 Filing date: Jan 27, 2000 Issue date: Mar 19, 2002
26 Manually adjustable variable-pitch boat propeller - A variable-pitch boat propeller has a hub rotatable about a hub axis, a plurality of vanes rotatable on the hub and extending generally radially of the hub axis. Patent number: 6364610 Filing date: Aug 4, 2000 Issue date: Apr 2, 2002
27 Boat propeller capable of being easily changed in pitch thereof - A boat propeller comprises a hub formed of a front cylindrical member and a rear cylindrical member. Patent number: 6506019 Filing date: May 29, 2001 Issue date: Jan 14, 2003
28 Manually operable boat propeller - A manually operable unit having a single handle for driving, steering and tilting a boat propeller. Patent number: 5030145 Filing date: Jul 11, 1990 Issue date: Jul 9, 1991
29 Boat propeller drive unit - Boat propeller drive unit, comprising a frame-like carrier intended to be fixedly joined to a boat transom, and a propeller rig which is suspended in a fork for trim and tilting movement relative to the fork about a horizontal axis. Patent number: 5755604 Filing date: Dec 30, 1996 Issue date: May 26, 1998
30 Boat propeller shield Patent number: D322593 Filing date: Jul 14, 1989 Issue date: Dec 24, 1991
31 Boat propeller cover Patent number: D344456 Filing date: Feb 21, 1992 Issue date: Feb 22, 1994
32 Boat propeller drive unit - An outboard boat propeller drive unit with an anti-cavitation plate above the propeller or propellers has an exhaust duct extending through the anti-cavitation plate. Patent number: 5441432 Filing date: Jan 13, 1994 Issue date: Aug 15, 1995
33 Boat propeller transmission - Boat propeller transmission with a horizontal input shaft, a bevel gear set, a vertical intermediate shaft, an additional bevel gear set, and at least one horizontal propeller shaft. Patent number: 6582259 Filing date: Sep 7, 2001 Issue date: Jun 24, 2003
34 Adjustable-pitch boat propeller - A boat propeller has a housing adapted to be fixed to a boat, a hub rotatable about a main axis on the housing. Patent number: 6287077 Filing date: Feb 15, 2000 Issue date: Sep 11, 2001
35 Boat propeller sled - A boat propeller sled comprising a spine, straps attached to the spine, and rails attached to the spine. Patent number: 5664977 Filing date: May 3, 1996 Issue date: Sep 9, 1997
36 Boat propeller transmission - Boat propeller transmission with a horizontal input shaft, a bevel gear set, a vertical intermediate shaft, an additional bevel gear set, and at least one horizontal propeller shaft. Patent number: 6439937 Filing date: Sep 7, 2001 Issue date: Aug 27, 2002
37 Canal-Boat Propeller Patent number: 226931 Filing date: Mar 4, 1880 Issue date: Apr 1880
38 Arrangement in boat propeller installations - The invention relates to an arrangement in propeller installations including means for supplying motor exhaust gases to the vicinity of the propeller. Patent number: 4891025 Filing date: Mar 7, 1988 Issue date: Jan 2, 1990
39 Propeller combination for a boat propeller unit - The invention relates to a boat propeller unit with double, counter-rotating propellers. Patent number: RE34011 Filing date: May 2, 1990 Issue date: Jul 28, 1992
40 Propeller combination for a boat propeller unit - The invention relates to a boat propeller unit with double, counter-rotating propellers. Patent number: RE34011 Filing date: May 2, 1990 Issue date: Jul 28, 1992
Link to patent info 41 Apparatus for emergency enablement of a disabled boat propeller - Apparatus for emergency enablement of a boat propeller. Patent number: 5071376 Filing date: Nov 28, 1990 Issue date: Dec 10, 1991
42 Variable-pitch boat propeller with easy-change vanes - A variable-pitch boat propeller has a hub centered on and rotatable about a hub axis and formed with a radially out-wardly open pocket having a predetermined inside diameter. Patent number: 6352410 Filing date: Aug 4, 2000 Issue date: Mar 5, 2002
43 Steering shock absorber for boat propeller drive units - A shock absorber for absorbing external momentary steering forces acting on a steerable stern drive for boats. Patent number: 5049097 Filing date: Apr 20, 1990 Issue date: Sep 17, 1991
44 High performance boat prop guard with high strength attachment bracket - The openings in the ring are formed so as to allow water to pass therethrough during operation so as to improve the performance characteristics, specifically acceleration, plaining, speed and steering, of the motor. Patent number: 5098321 Filing date: Sep 21, 1990 Issue date: Mar 24, 1992
45 Propeller guard - A device to protect the propellor of a boat from damage caused by striking underwater obstacles, when the boat is moving in any direction relative to the obstacles, and to improve the movement of the boat along the water. Patent number: 5224889 Filing date: Dec 2, 1991 Issue date: Jul 6, 1993
46 Boat-propeller unit - A boat-propeller unit comprises a carrier (4), a propeller-leg (5) and a sensor (13) which senses the angle of the propeller-leg. Patent number: 4985005 Filing date: Oct 25, 1989 Issue date: Jan 15, 1991
47 High performance boat prop guard - A propeller guard including a multi-angled band formed of a plurality of independently radiused sections. Patent number: 6159062 Filing date: Jun 30, 1999 Issue date: Dec 12, 2000
48 Rear light for a motor boat propeller to facilitate safe trailer transport of the motor boat - A tail light to be installed onto the end of a boat motor propeller, to increase visibility of the propeller when the boat is being hauled on a trailer. Patent number: 6971933 Filing date: Feb 18, 2005 Issue date: Dec 6, 2005
49 Protective cover for a propeller - A protective propeller cover includes a flexible sleeve into which buoyant material is placed to provide a buoyant enclosure. Patent number: 6152064 Filing date: Aug 19, 1999 Issue date: Nov 28, 2000
50 Hydraulic system in a boat hull, preferably a boat hull having an outboard drive - A hydraulic installation in a boat hull for swinging a propeller rig pivotably suspended in a shell on a boat transom using a piston-cylinder device arranged in a hydraulic control circuit. Patent number: 6554662 Filing date: Oct 24, 2001 Issue date: Apr 29, 2003
51 Efficient motors and controls for watercraft - Electronic control systems, devices and algorithms are described for improving boat efficiency, safety and convenience, particularly for electric motor powered boats. Patent number: 6659815 Filing date: Jun 10, 2002 Issue date: Dec 9, 2003
52 Motorboat propeller safety enclosure - A boat propeller safety enclosure for the covering of the propeller of a boat during road transportation, which enhances the ability of those following the trailered boat to avoid contact with the propeller, is provided. Patent number: 6736686 Filing date: Jul 23, 2001 Issue date: May 18, 2004
53 Power boat with extended propeller pocket - A boat includes a transom with an inboard engine disposed closely adjacently forward of the transom, a straight propeller shaft.
Patent number: 4383828 Filing date: Jul 27, 1981 Issue date: May 17, 1983
54 Defecting propeller guard - A deflecting propeller guard comprising a pair of adjacent deflector plates slanting downwardly and rearwardly from a front apex location to provide downwardly and laterally facing deflection surfaces. Patent number: 6168483 Filing date: Oct 14, 1999 Issue date: Jan 2, 2001
55 Marine propeller assembly with shock absorbing hub and easily replaceable propeller housing - A shock absorbing hub for a marine propeller assembly includes an inner spindle telescoped onto the splined drive shaft of the engine. Patent number: 5252028 Filing date: Sep 14, 1992 Issue date: Oct 12, 1993
56 Pedal driven outboard propeller and steering assembly - An outboard propeller drive and steering assembly for a boat. Patent number: 4427392 Filing date: May 18, 1981 Issue date: Jan 24, 1984
57 Propeller tunnel baffle and method - A marine craft having a propeller tunnel in which the sidewalls of the tunnel are essentially parallel and vertical and mate with a descending upper surface of the tunnel. Patent number: 4689026 Filing date: Aug 26, 1985 Issue date: Aug 25, 1987
58 High speed boat lifting structures - A thrust collar is disclosed for mounting around the upper portion of the propeller of an inboard/outboard engine. Patent number: 4756265 Filing date: Aug 12, 1986 Issue date: Jul 12, 1988
59 Double propeller drive for boats - A boat propeller drive with double, counter-rotating propellers. Patent number: 4619584 Filing date: Feb 2, 1984 Issue date: Oct 28, 1986
60 Outboard motor mounting means affording upward tilting without travel of the motor forwardly of ... - Disclosed herein is a marine propulsion device comprising a bracket adapted to be fixed to the transom of a boat. Patent number: 4395238 Filing date: Feb 20, 1981 Issue date: Jul 26, 1983
61 Boat propulsion and handling system - An improved boat construction is disclosed in which a boat, having the typical elongated hull, bow and stern, has a bottom configured as a hydroplane including a transverse step spaced from the bow and stern. Patent number: 4977845 Filing date: Aug 14, 1989 Issue date: Dec 18, 1990
62 Boat drive with adjustable pitch propeller - A boat drive of the type in which housing outside the hull of the board and below the water level receives a hollow propeller shaft driven by a drive shaft connected to the propeller shaft by a transmission. Patent number: 5073134 Filing date: Dec 28, 1990 Issue date: Dec 17, 1991
63 Propeller driven tunnel boat - A tunnel boat design that is not dependent upon turbulent or resurgent water flow is disclosed. Patent number: 4685889 Filing date: Dec 23, 1986 Issue date: Aug 11, 1987
64 Surface-effect aerofoil boat - A surface-effect aerofoil boat having two aerofoils arranged in tandem and having a gap for a propulsion or air screw between a vertical fin. Patent number: 4365578 Filing date: Jul 25, 1980 Issue date: Dec 28, 1982
65 Boat hull with flow chamber - A boat hull having a two-stage flow chamber. Patent number: 4609360 Filing date: Jul 12, 1984 Issue date: Sep 2, 1986
66 Motor-boat hull - A motor-boat hull includes a planing bottom having a V-shaped forward portion. Patent number: 4924797 Filing date: Jul 1, 1988 Issue date: May 15, 1990
67 Paired motor system for small boat propulsion and steerage - Paired spaced electrically driven motors provide a steerable propelling system for small boats. Patent number: 5090929 Filing date: Apr 12, 1991 Issue date: Feb 25, 1992
68 Reflective propeller safety cover - A reflective propeller safety cover comprising a bag having a flat bottom wall and a side wall. Patent number: 5664975 Filing date: Sep 28, 1994 Issue date: Sep 9, 1997
69 Boat hull for V-bottom powerboats - A powerboat hull construction with greatly enhanced performance characteristics is provided. Patent number: 5063868 Filing date: Jul 6, 1990 Issue date: Nov 12, 1991
70 Motorboat propeller safety shroud - A protective enclosure and propulsive system for a motor-driven multi-bladed marine propeller includes shroud housing. Patent number: 5389021 Filing date: Sep 20, 1993 Issue date: Feb 14, 1995
71 Collapsible pontoon pedal boat - A watercraft comprising a body, two inflatable floatation members, a drive assembly, a steering assembly and a seat wherein the body portion of the watercraft is foldably collapsible from an operative configuration to a transportable configuration. Patent number: 5651706 Filing date: Oct 23, 1995 Issue date: Jul 29, 1997
72 Propeller for boat - A propeller for a boat having a plurality of recesses and a plurality of land portions arranged circumferentially alternately around an outer periphery of a propeller boss which is fitted over and connected to a propeller shaft. Patent number: 5494406 Filing date: May 20, 1994 Issue date: Feb 27, 1996
73 Variable propeller for boat - A sleeve spline-fitted in an outer periphery of a propeller shaft is connected to a propeller boss for surrounding the outer periphery of the sleeve. Patent number: 5466177 Filing date: Dec 27, 1994 Issue date: Nov 14, 1995
74 Propeller for boat - In a propeller for a boat, a plurality of stationary blades and a plurality of variable blades are alternately disposed around an outer periphery of a propeller boss. Patent number: 5593280 Filing date: Oct 19, 1995 Issue date: Jan 14, 1997
75 Bow-mounted propeller driven boat - A highly maneuverable, efficient boat having a bow-mounted propeller drive with a forwardly directed propeller for pulling the boat through the water. Patent number: 4324551 Filing date: Dec 29, 1980 Issue date: Apr 13, 1982
76 Boat motor propeller and skeg guard Patent number: D352265 Filing date: Sep 21, 1993 Issue date: Nov 8, 1994
77 Propeller cage for a boat motor - Patent number: D325916 Filing date: Jul 20, 1989 Issue date: May 5, 1992
78 Combined throttle and propeller-pitch control for boat - A boat drive having a variable-speed engine connected through a clutch to a variable-pitch propeller. Patent number: 6264512 Filing date: Aug 4, 2000 Issue date: Jul 24, 2001
79 Boat propulsion system - A boat propulsion system for propelling a boat through water with debris in the water and shallows. Patent number: 6790108 Filing date: Feb 12, 2003 Issue date: Sep 14, 2004
80 Shallow water boat design - A boat provides full operation even in shallow water utilizing an outboard motor. Patent number: 4713028 Filing date: Jun 19, 1986 Issue date: Dec 15, 1987
81 Boat hull - A motorized pleasure boat having an essentially V-shaped hull. Patent number: 4492176 Filing date: Jan 4, 1982 Issue date: Jan 8, 1985
82 Propulsion means for a boat - A propulsion aggregate for boats of planing type is disclosed. Patent number: 6887115 Filing date: Jan 31, 2001 Issue date: May 3, 2005
83 Tool for cleaning propeller shafts - An improved scraping tool is provided for removing barnacles from the propeller shafts of boats with inboard marine engines while the boat is in the water. Patent number: 4649849 Filing date: Mar 26, 1985 Issue date: Mar 17, 1987
84 Drive arrangement for a planing boat - In a drive arrangement for a planing hull boat in which a drive shaft extends from a motor within the hull through the stern wall. Patent number: 5066255 Filing date: Jun 20, 1990 Issue date: Nov 19, 1991
85 Boat propulsion device with internal exhaust - A marine drive which mounts through a hole in the bottom surface of a boat utilizes a driveshaft housing assembly. Patent number: 4911666 Filing date: Jun 15, 1987 Issue date: Mar 27, 1990
86 Marine propeller - A marine propeller with increased performance in reverse has a hub and a multiplicity of blades extending radially outward. Patent number: 6390776 Filing date: Mar 30, 2000 Issue date: May 21, 2002
87 Drive assembly for inboard speedboat - A high performance speedboat with a planing type hull and incorporating a drive mechanism having a one or two-speed-forward, step-up, V-gear, hydraulic transmission, which connects the engine drive shaft and the propeller shaft in V-drive structure. Patent number: 4383829 Filing date: Mar 18, 1982 Issue date: May 17, 1983
88 Marine propeller with adjustable cupping - A marine propeller including a hub rotatable about a longitudinal axis and having a plurality of blades extending outwardly from the hub. Patent number: 5791874 Filing date: Jan 23, 1997 Issue date: Aug 11, 1998
89 Marine propeller and hub assembly - A hub assembly comprising a driver telescoped within a driven member is disclosed. Patent number: 6132267 Filing date: Mar 15, 1999 Issue date: Oct 17, 2000
91 System for propulsion of boats by means of winds and streams and for recovery of energy - The invention relates to an improved system for propulsion of boats by winds and streams and for recovery of disposable energy from floating stations. Patent number: 4371346 Filing date: Aug 20, 1980 Issue date: Feb 1, 1983
92 Transmission for small boat - This disclosure relates to a transmission for a small boat including a hull, an engine mounted on the hull, the engine having a crankshaft. Patent number: 4722707 Filing date: Jan 22, 1986 Issue date: Feb 2, 1988
93 Adjustable-pitch propeller, especially for sport boats - The positions of blade members on a hub of a propeller for a sport boat is determined by replaceable keys or plates fitted into openings of corresponding shape. Patent number: 6056609 Filing date: Sep 3, 1998 Issue date: May 2, 2000
94 Small boat thruster kit - A boat thruster kit that enables a boat owner to install a side thruster in a small boat with the aid of simple tools. Patent number: 5140926 Filing date: Jul 5, 1991 Issue date: Aug 25, 1992
95 Propeller drive for boats - A double-propeller drive unit for boats. Patent number: 4840136 Filing date: Sep 11, 1987 Issue date: Jun 20, 1989
96 Electronic propeller guard - Electronic methods, devices and kits electronically protect swimmers, animals and other objects in water from propeller strikes, and alleviate propeller damage. Patent number: 6676460 Filing date: Jul 3, 2002 Issue date: Jan 13, 2004
97 Propeller drive - A propeller drive having coaxially aligned propellers separately operable or operable in unison in the same rotary direction. Patent number: 5501623 Filing date: Oct 14, 1994 Issue date: Mar 26, 1996
98 Boat hull with tunnel structure - A boat hull having a tunnel structure along the bottom of the hull in the form of a truncated hollow partial cone indentation parallel to the keel of the boat. Patent number: 6544081 Filing date: Oct 10, 2001 Issue date: Apr 8, 2003
99 Air-boat sound suppressor and directional control system - The instant invention relates to a sound suppressor and directional control system for use with a boat hull propelled by a rearward directed jet of air, e.g. an air-boat. Patent number: 7101235 Filing date: Jul 26, 2004 Issue date: Sep 5, 2006
100 Surface-drive boat propulsion system - An improved propulsion system is provided for inboard motor boats with planing-type hulls. Patent number: 5249994 Filing date: Mar 19, 1993 Issue date: Oct 5, 1993
101 Hull and propeller arrangement - Hull and propeller arrangement for a surface watercraft (1), provided with at least one propeller. Patent number: 6851991 Filing date: May 9, 2001 Issue date: Feb 8, 2005
102 Leisure boat - A leisure boat is provided in a round form having a diameter of about 1 to 2 meters, and includes propeller means provided at a position closer to its bow. Patent number: 5176546 Filing date: May 30, 1991 Issue date: Jan 5, 1993
103 Propeller drive unit for boats - A double propeller drive unit for boats having an inclined steering axis and a trim fin arrangement which is fixed to the cavitation plate of the drive unit. Patent number: 4529387 Filing date: Sep 12, 1983 Issue date: Jul 16, 1985
104 Obstacle guard for a boat motor - The invention is a lower housing unit and propeller protection assembly for a boat motor. Patent number: 7011559 Filing date: May 13, 2005 Issue date: Mar 14, 2006
105 Autopilot-based steering and maneuvering system for boats - A boat featuring an autopilot-based steering and maneuvering system. Patent number: 6308651 Filing date: Mar 9, 2001 Issue date: Oct 30, 2001
106 Pedal powered boat motor - By using a flexible shaft, the user's seat can be placed lower in the vessel, thereby increasing stability. Patent number: 6171157 Filing date: May 12, 2000 Issue date: Jan 9, 2001
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