Patents by Inventor James W. Vroom

James W. Vroom 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).

  • Assist apparatus for ramps
    Patent number: 4657233
    Abstract: A coil spring, mounted within a cylinder and axially coincident with the pivot axis between a trailer and a ramp pivotally attached thereto, exerts a force angularly proportional to angular deviation of the ramp from its upright position to reduce the apparent weight of the ramp during manual repositioning of the ramp.
    Type: Grant
    Filed: April 19, 1985
    Date of Patent: April 14, 1987
    Inventor: James W. Vroom