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Patents & Innovations:
A Legacy of Engineering Excellence

The history of modern infrastructure is, in many ways, the history of Ellicott®. Ellicott has been at the forefront of hydraulic excavation, providing the mechanical muscle for projects as monumental as the original construction of the Panama Canal. Our “Patents and Innovation” series highlights the specific breakthroughs that have defined our brand for over a century. From the first portable cutter suction dredges to advanced dual-wheel excavators, these patents represent more than just legal filings—they are the blueprints for the world’s most reliable dredging equipment. Our engineering philosophy has always been centered on “toughness,” ensuring that every innovation serves to increase production and decrease downtime in the most challenging environments on Earth.

Patent: USA #3,535,051

The internal components of a dredge pump are constantly blasted by abrasive sand and gravel. Ellicott’s patented Recessed Impeller Vanes (also known as expeller vanes) are a clever mechanical solution to this wear-and-tear. Small vanes are recessed into the shrouds of the pump impeller, creating a localized pressure zone. This pressure pushes abrasive material away from the pump’s internal seals and liners, ensuring that the most vulnerable parts of the pump remain protected. This innovation dramatically increases the time between required maintenance and pump rebuilds.

Patents: USA #4,753,023, #3,777,376

Dredging hard materials subjects the cutterhead and its drive shaft to extreme vibration and “side-loading.” To prevent structural failure, Ellicott patented the Gimbal Cutterhead Drive. This system uses a universal (gimbaled) coupling that allows the drive shaft to orbit or flex slightly while rotating under load. By absorbing these stresses rather than resisting them, the gimbal drive protects the bearings and motor, significantly extending the life of the dredge’s most hardworking components.

Patents: USA #4,942,682, #7,379,194

Innovation often means making existing tools more versatile. The Back Hoe Module, commercially known as the “Hoe Dragon,” is a self-contained dredging unit that can be attached to the arm of a standard land-based excavator. This patented module includes its own submersible hanging pump and cutter wheel, allowing a contractor to convert a piece of dry-land equipment into a sub-aqueous dredge with minimal modification. It is the perfect solution for small-scale mining or marina maintenance where a full-sized dredge may not be practical.

Patents: USA #4,458,540, #3,926,050

Maximizing dredging production is a delicate balance between flow velocity and slurry density. Ellicott’s Production Meter and Remote Display patents introduced the first real-time electronic monitoring for dredge operators. The system calculates the weight of dry solids being moved and displays a “light spot” on a graphical grid. By keeping this spot within a designated “sweet spot” on the display, operators can ensure they are moving the maximum amount of material possible without the risk of “plugging” the pipeline, effectively turning the art of dredging into a precise science.

Patents: USA #4,702,023 | Australia #587139 | Brazil #P18204438

The Dual Wheel Excavator (DWE) represents the pinnacle of Ellicott’s excavation technology. Traditional single-wheel cutters are often only efficient when swinging in one direction. The DWE features two wheels mounted on a single axis, allowing the dredge to excavate material effectively during both the port and starboard swings. This “double-action” capability nearly doubles the production rate of the dredge and provides a more uniform slurry concentration, making it the global standard for high-output mining and reclamation projects.

Patents: USA #3,476,498, #4,397,106, #1,166,275 (Canada), #2,521,189 (France)

In 1976, Ellicott revolutionized the industry by designing and patenting the first Bucketwheel Cutterhead. Unlike traditional basket-style cutters, the bucketwheel uses a series of rotating scoops that feed material directly into a central hopper. This design provides much higher cutting force and is specifically engineered for high-density solids recovery. It transformed the way minerals and hard-packed sands are mined, providing a level of efficiency and excavation power that was previously impossible with standard suction dredging equipment.

Patent: United Kingdom #2,146,369

One of the greatest challenges in dredging is dealing with “sticky” materials like clay or compacted silt, which can clog excavator buckets and grind production to a halt. To combat this, Ellicott developed a patented Flushing System specifically for their Dual Wheel Excavators and also used on traditional basket-style cutterheads. This system uses high-pressure water jets to blast material out of the buckets as they rotate, ensuring they are completely empty and ready to take a full scoop on the next revolution. This self-cleaning mechanism allows for continuous operation in difficult soil conditions without the manual intervention typically required to clear a clogged cutterhead.

Patent: United Kingdom #2,146,370

In high-torque mining applications, consistency is key. Ellicott’s patented Divider Plates are a critical internal component of the Ellicott Dual Wheel Excavator (DWE). These plates are designed to act as a primary screening tool, preventing oversized rocks and debris from entering the buckets and potentially clogging the suction pipe. By ensuring that only the target material size enters the system, these plates protect the dredge’s internal components, reduce downtime, and ensure a steady, high-density slurry flow, which is vital for the profitability of mineral mining operations.

Patent: USA (System Design)

Dredging in coastal environments or open water requires more than just a standard hull; it requires a vessel capable of handling unpredictable swells and harsh conditions. Ellicott’s Heavy Seas Dredge design focuses on increasing “freeboard”—the distance from the waterline to the deck—to prevent flooding during high waves. This innovation often incorporates articulated ladder joints and swell-compensation systems that allow the cutterhead to maintain contact with the floor even as the barge moves with the sea. This ensures that environmental and navigational dredging can continue in conditions that would force other dredges back to the harbor.