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 [Search a list of Patent Appplications for class 440]   CLASS 440,MARINE PROPULSION
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SECTION I - CLASS DEFINITION

This class includes and is limited to devices that relate to and have for their object means other than sails for moving a vessel through the water. Included are all types of propellers acting or reacting upon the water or atmosphere and all inventions for moving tows not otherwise classified.

To be proper for this class there must be significantly claimed vessel structure or a claimed modification to the vessel structure to accommodate the propulsion device. If no more vessel structure is claimed than is necessary to mount the propulsion device, the device should be classified in the proper motive power class. This class, however, takes outboard motor types of propulsion devices regardless of claimed structure.

(1) Note. The term "vessel" in the definition may include a person or animal. Mere aquatic devices secured to or held by a person or animal to increase the effective contact between the user and the liquid and thereby cause faster or farther propulsion through the liquid by the user"s swimming strokes are not included. For such devices, see References to Other Classes, below.

SECTION II - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS

Inventions pertaining to the structure or details of boats and skimming or walking devices (e.g., toboggans, water skis, etc.), are classified elsewhere. See References to Other Classes, below.

SECTION III - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

60Power Plants,   for reaction motors per se not limited specifically to propelling a vessel in water.
74Machine Element or Mechanism,   for transmissions having no specific marine housing or no more than a nominal load.
114Ships,   subclasses 312+ for those inventions claiming features to cause boats or other devices to submerge and resurface at will. Inventions pertinent to structure or details of ships are classified in Class 114.
416Fluid Reaction Surfaces (i.e., Impellers),   for the combination of an impeller and a marine vessel wherein the impeller is arranged to propel the vessel and no more structure of the vessel is claimed than is necessary to mount the impeller inclusive of any impeller motor or drive means. Any additional recitation of vessel structure or any modification of the vessel will require classification in Class 440. See Class 416, Lines With Other Classes and Within This Class, for a detailed statement of the class line.
441Buoys, Rafts, and Aquatic Devices,   appropriate subclasses for inventions pertaining to the structure or details of boats and skimming or walking devices (e.g., toboggans, water skis, etc.), unless features are claimed to cause such boats or other devices to submerge and resurface at will; subclasses 55+ for aquatic devices secured to or held by a person or animal to increase the effective contact between the user and the liquid and thereby cause faster or farther propulsion through the liquid by the user"s swimming strokes.
475Planetary Gear Transmission Systems or Components,   for planetary gear transmission having no more than a nominal load.

SECTION IV - GLOSSARY

The following terms or words, used throughout the titles and definitions are set forth with the meaning each is to have in this class.

ENGINE

A device which converts thermal energy into mechanical energy or power to produce force or motion.

MOTOR

A device which receives and modifies electrical energy or energy from some natural source in order to produce force or motion.

MOTIVE FORCE

Any force used to impart motion.

PADDLE

A device used to propel a vessel in the water consisting of a broad fairly flat blade that is dipped vertically or near vertically into the water.

PROPELLING MEANS

The element of the propulsion unit which acts upon the surrounding fluid (air or water) to cause the vessel to move.

PROPULSION UNIT

The total combination of all elements including the engine, the propelling means, the casing, etc., involved in moving a vessel.

REACTING SURFACE

The area or face of the propelling means which directly displaces the surrounding fluid.

SUBCLASSES

[List of Patents for class 440 subclass 1]    1MEANS TO CONTROL THE SUPPLY OF ENERGY RESPONSIVE TO A SENSED CONDITION:
 This subclass is indented under the class definition.  Device having means to regulate the supply of energy or power used to operate the device or an element thereof, the operation of the regulating means in turn being affected by a means which detects a characteristic or a change in a characteristic of the device or an element thereof or of the surrounding environment.
  
[List of Patents for class 440 subclass 2]    2WITH INDICATOR:
 This subclass is indented under the class definition.  Device having means to actuate a signalling means such as a gauge, dial, meter, etc., which reports the status of a propulsion unit.
  
[List of Patents for class 440 subclass 3]    3DIVERSE ENGINE MEANS:
 This subclass is indented under the class definition.  Device wherein one propelling means is driven by interconnected diverse power means which can power the propelling means selectively or simultaneously.
  
[List of Patents for class 440 subclass 4]    4PLURAL ENGINES WITH SINGLE PROPELLING MEANS:
 This subclass is indented under the class definition.  Device wherein multiple engine power means of similar type provide the motive force for a propelling means.
(1) Note. Turbine sets which make up the power means for a propelling means are considered single engines.
  
[List of Patents for class 440 subclass 5]    5HYDRAULIC FLUID DRIVE FOR PROPELLING MEANS:
 This subclass is indented under the class definition.  Device wherein a liquid under pressure drives an impeller which rotates a drive shaft to supply the motive force to a propelling means.
  
[List of Patents for class 440 subclass 6]    6ELECTRIC DRIVE FOR PROPELLING MEANS:
 This subclass is indented under the class definition.  Device wherein an electrically powered motor supplies the motive force to a propelling means.
  
[List of Patents for class 440 subclass 7]    7With foot control:
 This subclass is indented under subclass 6.  Device wherein the electrically powered motor is regulated by a means operated by the foot of an occupant of the vessel.
  
[List of Patents for class 440 subclass 8]    8WIND DRIVEN MOTORS:
 This subclass is indented under the class definition.  Device wherein a motor driven by naturally moving air provides the power for a propelling means.
  
[List of Patents for class 440 subclass 9]    9WAVE POWERED PROPELLING MEANS:
 This subclass is indented under the class definition.  Device wherein the motive force for a propelling means is derived from a motor which reacts to the undulations on the water surface or the motion imparted to the vessel by those undulations.

SEE OR SEARCH CLASS:

60Power Plants,   subclasses 495+ for motors which depend for operation on the buoyancy of a fluid or on the vertical component of tides and waves.
  
[List of Patents for class 440 subclass 10]    10By oscillating weight:
 This subclass is indented under subclass 9.  Device wherein the motor to drive the propelling means consists of a weight which oscillates due to the undulation of the water surface.

SEE OR SEARCH CLASS:

185Motors: Spring, Weight, and Animal Powered,   subclasses 29 and 30.
  
[List of Patents for class 440 subclass 11]    11POWERED FROM LAND VEHICLE SUPPORTED BY VESSEL:
 This subclass is indented under the class definition.  Device comprising a watercraft structure provided with propelling means and supporting a ground traversing vehicle thereon; the propelling means being directly driven by a drive connection with the motive means of the ground traversing vehicle.

SEE OR SEARCH CLASS:

114Ships,   subclasses 60 and 70 for canal and ferry boats.
441Buoys, Rafts, and Aquatic Devices,   subclasses 35+ for vehicle rafts, per se.
  
[List of Patents for class 440 subclass 12]    12Land vehicle is two-wheel type:
 This subclass is indented under subclass 11.  Device wherein the ground traversing vehicle is a bicycle, motorcycle, or the like.
  
[List of Patents for class 440 subclass 12.5]    12.5SELF-PROPELLED VEHICLE HAVING LAND AND WATER PROPULSION MEANS (E.G., AMPHIBIOUS VEHICLE):
 This subclass is indented under the class definition.  Subject matter wherein a device which is in contact with a supporting surface (a) is designed for carrying a passenger, or a load over a distance (i.e., vehicle), and (b) has means for moving it under its own power over the supporting surface which is both on terra firma (i.e., land) and through a body of water.

SEE OR SEARCH THIS CLASS, SUBCLASS:

11+,for a vessel deriving motive power from a land vehicle supported by the vessel.
37,for an air propelled boat which is capable of, but not intended to travel on land.
344,for a boat with a wheeled buoyant landing or launching aid.

SEE OR SEARCH CLASS:

14Bridges,   subclasses 2.4+ for a bridge transportable over land and water.
89Ordnance,   subclass 36.08 for a self-propelled device for protecting an ordnance device or ordnance operating personnel.
180Motor Vehicles,   appropriate subclasses for propelling means for land vehicles, especially subclasses 116+ for ground effect vehicles usable over any supporting surface.
244Aeronautics and Astronautics,   subclass 50 for aircraft propulsion and steering on land or water.
280Land Vehicles,   appropriate subclasses for land vehicles, per se, and subclasses 414.1+ for trailers of the boat carrying type.
  
[List of Patents for class 440 subclass 12.51]    12.51Having separated propulsion means for land and water:
 This subclass is indented under subclass 12.5.  Subject matter wherein (a) the vehicle has a distinct means for moving it under its own power on land and a distinct means for moving it under its own power through a body of water, (b) the distinct means for moving it on land and the distinct means for moving it through the body of water being spaced apart from each other.
(1) Note. The distinct means may be connected to a common axle, such as a wheel and a set of paddles driven by a common axle, however, the paddles may not contact the ground when the ground engaging wheel propels the vehicle.

SEE OR SEARCH THIS CLASS, SUBCLASS:

12.66+,for wheel-type land propelling means having a blade integrally mounted on or forming a part of the wheel.
  
[List of Patents for class 440 subclass 12.52]    12.52Propulsion means moveable to stowed position:
 This subclass is indented under subclass 12.51.  Subject matter wherein either the means for moving (a)the vehicle over land, or (b)through the water is shiftable to a storage position from an in use position.
(1) Note. To be proper for this and the indented subclasses the means for imparting a motive force to the vehicle must be moveable between a stowed and a use position, a wheel or pontoon which supports the vehicle with respect to a surface, but is not directly driven is not considered proper and will be found elsewhere.

SEE OR SEARCH CLASS:

180Motor Vehicles,   appropriate subclasses, for a vertically adjustable motor driven vehicle wheel.
280Land Vehicles,   subclasses 43+ for a land vehicle having vertically adjustable wheels, subclasses 414.1+ for trailers of the boat carrying type, and subclasses 414.5+ for a trailer having a vertically adjustable wheel.
  
[List of Patents for class 440 subclass 12.53]    12.53Water propulsion means is movable:
 This subclass is indented under subclass 12.52.  Subject matter wherein the means for moving the vehicle through the water is shiftable to a storage position from an in use position.

SEE OR SEARCH CLASS:

440Marine Propulsion,   subclasses 53+ , for means for effecting or facilitating movement of a screw propulsion unit or a segment of the propulsion unit, and 91, for means to reposition a paddle wheel assembly.
  
[List of Patents for class 440 subclass 12.54]    12.54And land propulsion means is moveable:
 This subclass is indented under subclass 12.53.  Subject matter wherein the means for moving the vehicle on land is also shiftable to a storage position from an in use position.

SEE OR SEARCH CLASS:

180Motor Vehicles,   appropriate subclasses for a vertically adjustable motor driven vehicle wheel.
280Land Vehicles,   subclasses 43+ for a land vehicle having vertically adjustable wheels, subclasses 414.1+ for trailers of the boat carrying type, and subclasses 414.5+, for a trailer having a vertically adjustable wheel.
  
[List of Patents for class 440 subclass 12.55]    12.55Operator powered drive for propulsion means:
 This subclass is indented under subclass 12.51.  Subject matter wherein the motive force for the means for moving the vehicle under its own power is derived from the physical effort exerted by an occupant of the vehicle and is transmitted to the moving means by some intermediate means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

21+,for operator powered propelling means for a marine vehicle.

SEE OR SEARCH CLASS:

280Land Vehicles,   appropriate subclasses for operator powered propelling means for a land vehicle.
  
[List of Patents for class 440 subclass 12.56]    12.56Flexible endless track propulsion means:
 This subclass is indented under subclass 12.51.  Subject matter wherein the means for moving the vehicle under its own power includes (a) an annular band made either of a single piece of flexible material or of a plurality of individual treads or sections movably connected together, (b) the annular band contacting the land or the body of water and applying a force thereto.

SEE OR SEARCH THIS CLASS, SUBCLASS:

95+,for flexible endless track propelling means for a marine vehicle, per se.

SEE OR SEARCH CLASS:

180Motor Vehicles,   especially subclasses 6.2+ for steering by driving of a motor propelled land vehicle, subclass 6.7 for steering by driving of a motor propelled land vehicle having an endless flexible track, and subclasses 9.1+, for a motor propelled land vehicle having a flexible endless track for propulsion.
305Wheel Substitutes for Land Vehicles,   appropriate subclasses, especially subclasses 35+ for a flexible endless track for propelling a land vehicle.
  
[List of Patents for class 440 subclass 12.57]    12.57Motor driven screw propeller shaft:
 This subclass is indented 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.
  
[List of Patents for class 440 subclass 12.58]    12.58By flexible endless member (e.g., belt, chain):
 This subclass is indented under subclass 12.57.  Subject matter wherein the long generally cylindrical slender element is rotated about its longitudinal axis by an annular band made either of (a) a single piece of flexible material or (b) a plurality of individual sections movably connected together.

SEE OR SEARCH THIS CLASS, SUBCLASS:

474,Endless Belt Power Transmission Systems and Components, appropriate subclasses for endless belt power transmission systems and components, per se.
  
[List of Patents for class 440 subclass 12.59]    12.59By gearing:
 This subclass is indented under subclass 12.57.  Subject matter wherein the long generally cylindrical slender element is rotated about its longitudinal axis by (a) a toothed wheel, cylinder or other machine element that meshes with (b) another toothed wheel, cylinder or other machine element to transmit motion or to change speed or direction.

SEE OR SEARCH CLASS:

74Machine Elements and Mechanisms,   appropriate subclasses, for a gearing arrangement, per se.
  
[List of Patents for class 440 subclass 12.6]    12.6Bevel gearing:
 This subclass is indented under subclass 12.59.  Subject matter wherein the toothed wheel, cylinder, or other machine element has teeth cut into a conical surface located at an angle to the rotational axis of the wheel, cylinder, or other machine element that mesh with the another toothed wheel, cylinder, or machine element.

SEE OR SEARCH CLASS:

74Machine Elements and Mechanisms,   appropriate subclasses for a bevel gearing arrangement, per se.
  
[List of Patents for class 440 subclass 12.61]    12.61Spur gearing:
 This subclass is indented under subclass 12.59.  Subject matter wherein the toothed wheel, cylinder, or other machine element has radially projecting teeth located parallel to the rotational axis of the wheel, cylinder, or other machine element that mesh with the another toothed wheel, cylinder, or machine element.

SEE OR SEARCH CLASS:

74Machine Elements and Mechanisms,   appropriate subclasses for a spur gearing arrangement, per se.
  
[List of Patents for class 440 subclass 12.62]    12.62Operator powered drive for propulsion means:
 This subclass is indented under subclass 12.5.  Subject matter wherein the motive force for the means for moving the vehicle under its own power is derived from the physical effort exerted by an occupant of the vehicle and is transmitted to the moving means by some intermediate means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

21+,for an operator powered drive for a propelling means for a marine vehicle.

SEE OR SEARCH CLASS:

280Land Vehicles,   appropriate subclasses for operator powered propelling means for a land vehicle.
  
[List of Patents for class 440 subclass 12.63]    12.63Flexible endless track propulsion means:
 This subclass is indented under subclass 12.5.  Subject matter wherein the means for moving the vehicle under its own power includes (a) an annular band made either of a single piece of flexible material, or of a plurality of individual treads or sections movably connected together and (b) the annular band contacting the land or the body of water and applying a force thereto.

SEE OR SEARCH THIS CLASS, SUBCLASS:

95+,for flexible endless track propelling means for a marine vehicle, per se.

SEE OR SEARCH CLASS:

180Motor Vehicles,   especially subclasses 6.2+ for steering by driving of a motor propelled land vehicle, subclass 6.7 for steering by driving of a motor propelled land vehicle having an endless flexible track, subclasses 9.1+ for a motor propelled land vehicle having a flexible endless track for propulsion, and subclasses 190+ for a motor propelled land vehicle including a ski-like runner or member and a flexible endless track for propulsion.
305Wheel Substitutes for Land Vehicles,   appropriate subclasses, especially subclasses 35+ for a flexible endless track for propelling a land vehicle.
  
[List of Patents for class 440 subclass 12.64]    12.64Driven by sprocket-type wheel:
 This subclass is indented under subclass 12.63.  Subject matter wherein the means for supplying motive power to the annular band includes a cylindrical element having teeth projecting radially from its circumference.
  
[List of Patents for class 440 subclass 12.65]    12.65Helical screw propulsion means:
 This subclass is indented 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).
  
[List of Patents for class 440 subclass 12.66]    12.66Wheel-type propulsion means:
 This subclass is indented under subclass 12.5.  Subject matter wherein the means for moving the vehicle under its own power includes (a) either a solid disk, or a rigid circular rim connected by a plurality of rods to a hub, (b) the solid disk or rim designed to turn around an axle passed through the center of the disk or rim, and (c) the disk or rim directly contacts the land or the body of water.

SEE OR SEARCH THIS CLASS, SUBCLASS:

90+,for a paddle wheel, per se.

SEE OR SEARCH CLASS:

180Motor Vehicles,   appropriate subclasses for a motor propelled, wheeled, land vehicle, per se, and subclasses 7.1+ for a special driving device therefor.
301Land Vehicles, Wheels, and Axles,   appropriate subclasses for land vehicle wheels, per se.
  
[List of Patents for class 440 subclass 12.67]    12.67Drum-type:
 This subclass is indented under subclass 12.66.  Subject matter wherein the disk or rim is (1) spaced from, (2) connected to, and (3) rotatable with another disk or rim by a right circular cylindrical member extending along the axle.
(1) Note. Many of the drums have reacting surfaces integral with their cylindrical perimeter surfaces which enhance the transfer of force from the propulsion means to the water.
  
[List of Patents for class 440 subclass 12.68]    12.68Having integral spoke and propelling blade means:
 This subclass is indented under subclass 12.66.  Subject matter wherein the propelling means includes a broad fairly flat or moderately curved surface that is dipped into the water and is integral with the rod which connects the hub and the rim.
  
[List of Patents for class 440 subclass 12.69]    12.69Having propelling blade extending from side of wheel:
 This subclass is indented under subclass 12.66.  Subject matter wherein the propelling means includes a broad fairly flat or moderately curved surface which projects parallel to the axle from a lateral extent of the disk or rim.
  
[List of Patents for class 440 subclass 12.7]    12.7Having peripherally mounted cleat means:
 This subclass is indented under subclass 12.66.  Subject matter wherein the propelling means includes a blade projecting from or forming part of a radial peripheral extent of the disk or rim.
  
[List of Patents for class 440 subclass 13]    13OSCILLATING PROPELLING MEANS:
 This subclass is indented under the class definition.  Device wherein the motive force for the vessel is produced by a back and forth movement of the propelling means.
  
[List of Patents for class 440 subclass 14]    14Fishtail motion propelling means:
 This subclass is indented under subclass 13.  Device wherein the propelling means moves through the water with a side-to-side or whipping motion, generally imitating the motion of the tail of a fish.
  
[List of Patents for class 440 subclass 15]    15Flexible:
 This subclass is indented under subclass 14.  Device wherein the reacting surface which comes in contact with the water is made of a pliant material.
  
[List of Patents for class 440 subclass 16]    16Moving wave propeller:
 This subclass is indented under subclass 13.  Device wherein the propelling means comprises a structure which undulates in the manner of a traveling wave.
  
[List of Patents for class 440 subclass 17]    17Having nonpropelling cycle segment:
 This subclass is indented under subclass 13.  Device wherein the propelling means supplies no motive force on one portion of its back and forth movement.
  
[List of Patents for class 440 subclass 18]    18Piston and cylinder:
 This subclass is indented under subclass 17.  Device wherein the propelling means is a fluid motor, the return stroke normally being the nonpropelling cycle portion.
  
[List of Patents for class 440 subclass 19]    19With means to move propelling element to nonpropelling position:
 This subclass is indented under subclass 17.  Device wherein a means is provided to shift the propelling element from its working position to its nonworking position.
  
[List of Patents for class 440 subclass 20]    20With reversing means:
 This subclass is indented under subclass 17.  Device wherein a means is provided to invert the propelling means in such a manner that the portion of the back and forth motion which supplies no motive force and the portion of the back and forth motion which supplies motive force can be interchanged.
  
[List of Patents for class 440 subclass 21]    21OPERATOR POWERED DRIVE FOR PROPELLING MEANS:
 This subclass is indented under the class definition.  Device wherein the motive force for the propelling means is derived from the physical effort exerted by the occupant of the vessel and transmitted to the propelling means by some intermediate means.
  
[List of Patents for class 440 subclass 22]    22Rocking watercraft:
 This subclass is indented under subclass 21.  Device wherein the motive force of a propelling means is obtained by a to-and-fro motion of the vessel imparted thereto by the occupant of the vessel.
  
[List of Patents for class 440 subclass 23]    23Fluid pump:
 This subclass is indented under subclass 21.  Device wherein the motive force is produced by hydraulic pressure acting directly or indirectly on the surrounding water, which pressure is produced by an operator powered hydraulic impelling means.
  
[List of Patents for class 440 subclass 24]    24Having reciprocating pull cable:
 This subclass is indented under subclass 21.  Device wherein the motive force is transmitted to a propelling means by means of a strandlike member moved alternately backward and forward.
  
[List of Patents for class 440 subclass 25]    25Sliding handle or pedal:
 This subclass is indented under subclass 21.  Device wherein the motive force is transmitted to a propelling means by means of a lever operated by either the hand or foot of the occupant wherein the lever is moving within a guide means.
  
[List of Patents for class 440 subclass 26]    26Rotary cranking arm:
 This subclass is indented under subclass 21.  Device wherein the motive force is transmitted to a propelling means by means of a revolving arm or lever.
  
[List of Patents for class 440 subclass 27]    27Plural-crank type:
 This subclass is indented under subclass 26.  Device wherein the motive force is transmitted to a propelling means by means of the rotation of multiple offset segments of a revolving rod.
  
[List of Patents for class 440 subclass 28]    28Having flexible drive shaft:
 This subclass is indented under subclass 26.  Device wherein the motive force is transmitted from an actuator to a propelling means through bendable rotating elongated means.
  
[List of Patents for class 440 subclass 29]    29Having endless drive member:
 This subclass is indented under subclass 26.  Device wherein the motive force is transmitted from an actuator to a propelling means through a continuous band entrained about wheellike guides.
  
[List of Patents for class 440 subclass 30]    30Chain and sprocket:
 This subclass is indented under subclass 29.  Device wherein the continuous band is a chain and the wheellike guides are toothed wheels.
  
[List of Patents for class 440 subclass 31]    31Including gear means:
 This subclass is indented under subclass 26.  Device wherein the motive force is transmitted from the rotary crank to the propelling means by means of interengaged toothed members.
  
[List of Patents for class 440 subclass 32]    32Lever with connecting linkage:
 This subclass is indented under subclass 21.  Device wherein the motive force is transmitted to a propelling means by means of a bar that oscillates about a pivot to transmit the force to a propelling means through an intermediate connecting rod.
  
[List of Patents for class 440 subclass 33]    33TOWING:
 This subclass is indented under the class definition.  Device wherein the propulsion means is a means provided to haul or pull a vessel in a canal or river or upon the sea or other bodies of water.

SEE OR SEARCH CLASS:

114Ships,   subclasses 242+ for towing devices other than propelling means.
191Electricity: Transmission to Vehicles,   subclass 12 for electric railway systems.
  
[List of Patents for class 440 subclass 34]    34Cable system:
 This subclass is indented under subclass 33.  Device wherein the propulsion means includes the use of a strong strandlike member or a strandlike member is engaged by a device on the vessel to pull the vessel through the water.
(1) Note. The strandlike member may be either fixed or movable. If movable, the vessel is provided with means for securing the cable thereto, and if fixed, the vessel has traction means for hauling the cable in and paying it out.

SEE OR SEARCH CLASS:

191Electricity: Transmission to Vehicles,   subclass 12 when electrical devices are involved.
254Implements or Apparatus for Applying Pushing or Pulling Force,   subclasses 264+ for a driven, cable-pulling device for hauling or hoisting a load.
  
[List of Patents for class 440 subclass 35]    35Track system:
 This subclass is indented under subclass 33.  Device wherein the propulsion means comprises tracks upon which a traction device or vessel runs.
  
[List of Patents for class 440 subclass 36]    36Ground wheel or poler:
 This subclass is indented under subclass 33.  Device wherein the propulsion means comprises traction wheels which are used to traverse the bed or bottom of the canal or a long cylindrical piece of wood or metal attached to the vessel contacts or digs into the bed or bottom of the canal.
  
[List of Patents for class 440 subclass 37]    37AIR PROPELLED BOAT:
 This subclass is indented under the class definition.  Device wherein the propelling means is a fan or bladed member mounted entirely above the waterline which reacts with the air to produce the motive force.
  
[List of Patents for class 440 subclass 38]    38JET DRIVE:
 This subclass is indented under the class definition.  Device wherein the motive force is produced by a stream of fluid forcefully issuing from an outlet of the propulsion means which reacts with the fluid surrounding the propelling means thereby causing the vessel to move.

SEE OR SEARCH CLASS:

60Power Plants,   subclasses 221+ for reaction propulsion devices wherein no more structure of the vessel is claimed than is necessary to mount the device.
239Fluid Sprinkling, Spraying, and Diffusing,   subclasses 127.1+ and 265.11+ for a reaction motor discharge nozzle, per se, as defined and limited in (1) Note and (2) Note under subclass 265.11.
  
[List of Patents for class 440 subclass 39]    39Auxiliary use of propulsive fluid:
 This subclass is indented under subclass 38.  Device wherein a portion of the fluid stream may be diverted for a subsidiary use other than propulsion, e.g., firefighting.
  
[List of Patents for class 440 subclass 40]    40Direction control for fluid jet:
 This subclass is indented under subclass 38.  Device wherein a means is provided to guide the fluid stream into different directions.

SEE OR SEARCH CLASS:

60Power Plants,   subclass 228 for thrust direction modifiers for power plants not involving significant vessel structure.
  
[List of Patents for class 440 subclass 41]    41With bucket or clamshell-type reversing means:
 This subclass is indented under subclass 40.  Device wherein the means to guide the fluid stream is a scoop mounted exteriorly of the hull and selectively movable to intercept and redirect the flow of the jet.
  
[List of Patents for class 440 subclass 42]    42Pivoted outlet:
 This subclass is indented under subclass 40.  Device wherein the means to guide the fluid stream into different directions is a projecting discharge pipe which can be rotated or pivoted.
  
[List of Patents for class 440 subclass 43]    43Pivoted vane:
 This subclass is indented under subclass 40.  Device wherein the means to guide the fluid stream into different directions is a surface across which the fluid moves which can be pivoted to deflect the fluid stream.
  
[List of Patents for class 440 subclass 44]    44Propulsion fluid is pressurized gas:
 This subclass is indented under subclass 38.  Device wherein the motive force is provided by the ejection of a pressurized gas such as air or steam.
  
[List of Patents for class 440 subclass 45]    45Produced by combustion:
 This subclass is indented under subclass 44.  Device wherein the pressurized gas is created as a direct result of the burning of a substance.

SEE OR SEARCH CLASS:

417Pumps,   subclasses 73+ for pumps of the type which elevate or propel one fluid (e.g., liquid) by the ignition of another.
  
[List of Patents for class 440 subclass 46]    46Having means to prevent clogging:
 This subclass is indented under subclass 38.  Device wherein a means is provided to inhibit the obstruction of the fluid passageway by foreign material.
  
[List of Patents for class 440 subclass 47]    47Having means to increase fluid drive efficiency:
 This subclass is indented under subclass 38.  Device wherein the discharge pipe can have means to improve the fluid flow or the flow passage has additional means to improve flow.
  
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