Patents by Inventor Martin Donaldson

Martin Donaldson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Ladder roller and transport device
    Patent number: 10889442
    Abstract: A ladder transport device for use with a detachable ladder handle. The transport device has an axle and pair of wheels which are mounted on a body. The axle and wheels are rotatable and axially moveable relative to the body. The transport device body is securable to the detachable handle. The detachable handle is securable to the exterior side of a ladder near the end of the ladder. The user can then roll the ladder on the wheels by lifting and pulling on the opposite end of the ladder. Stability is improved by horizontally aligning the cross sectional center of gravity of the ladder between the wheels.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: January 12, 2021
    Inventors: Martin Donaldson, Jarran C. Davis