Patents by Inventor Ernest W. Stevenson

Ernest W. Stevenson 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).

  • Seaplane and dock lift
    Patent number: 4714375
    Abstract: A watercraft lift supported on one or a pair of stanchions that include a sleeve assembly mounted for slidable movement on the stanchions. A platform is mounted on forks carried by a cross arm inserted into the sleeve assemblies which protrude out from the stanchions. Upright members mounted on the platform carry fender members.In a modified form of the invention a single stanchion with a similar sleeve assembly, a cross arm and twin forks, lifts a floating dock.In a further modified form, a single stanchion with a similar sleeve assembly, a cross arm and twin forks, lifts a non-floating dock.In still another modified form a single stanchion with a sleeve assembly cross arm and twin forks carries a spaced frame for receiving a seaplane.
    Type: Grant
    Filed: June 20, 1986
    Date of Patent: December 22, 1987
    Assignee: Levitator, Inc.
    Inventors: Ernest W. Stevenson, Randall E. Nahas
  • Boat lift
    Patent number: 4482268
    Abstract: A boat lift supported on a single stanchion that includes a sleeve assembly mounted for slidable movement on the stanchion. A cross arm mounted on the sleeve assembly carries fork members which protrude out from the cross member. Blocks on the forks cradle the hull of a boat for lifting. Standards mounted on the cross member carry bumper floats and docking eyes.
    Type: Grant
    Filed: October 13, 1983
    Date of Patent: November 13, 1984
    Assignee: Levitator, Inc.
    Inventors: Ernest W. Stevenson, Randall E. Nahas