Boat lift
Patent 5051027 Issued on September 24, 1991. Estimated Expiration Date: 
December 15, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 15, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 735569 983957 2529948 3661415 3697048 Boat hoists Shiplift apparatus Cradle type boat lifts Patent #: 4686920 InventorApplicationNo. 451089 filed on 12/15/1989US Classes:405/3, Lifting114/44, VESSEL RAISING AND DOCKING254/338Plural elementsExaminersPrimary: Taylor, Dennis L.Assistant: Ricci, John A. Attorney, Agent or FirmForeign Patent References
International ClassB63C 003/06AbstractThe Boat Lift has two support rods with a lower pulley connected to each end of each support rod. An upper pulley and a winding device with a ratchet are located above each lower pulley. Four cords and a winch are provided. Each cord has one end connected to one winding device and extends downward around its associated lower pulley; upward around its upper pulley; and has its other end coupled to the winch. Operations of the winch lowers and raises the support rods. The ratchets and winding devices are employed to allow the two support rods to be leveled.Field of SearchMARINE VESSEL PORTAGE, LAUNCHING, OR REMOVINGRail mounted carrier Lifting Dry dock Fabrication Gate Vessel support (e.g., bilge or keel block) VESSEL RAISING AND DOCKING Floating dry docks Elevators Hoisting MOTHER SHIP, FLOATING LANDING PLATFORM, AND HARBOR Vessel carrier LAND VEHICLE OR BOAT TILTING AND LIFTING DEVICES Having rotatable, cable guiding, pulley wheel element spaced from drum Element repositionable relative to drum Plural elements Cable supported Plural elements | |
