Patents by Inventor Jeng Keh-Lin

Jeng Keh-Lin 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).

  • Patent number: 5366052
    Abstract: This invention relates to a reversible folding ladder which is composed of a ladder, two steel channels, a front frame and a rear frame. More particularly the ladder is composed of a front staircase and a rear staircase. There is a plurality of foot pedals hinged on both the front staircase and the rear staircase and the top of both the front staircase and the rear staircase is hinged on the front frame. Furthermore the front frame is connected with the rear frame by a pivot rod and can be reversed. A connecting part of the rear frame and the pivot rod can be rotated. When unfolding the reversible folding ladder to contact the ground, each foot pedals is arranged parallel with the front frame. Furthermore when the reversible folding ladder is rotated to a position parallel with the front frame, the rear staircase can be received into the front staircase.
    Type: Grant
    Filed: July 20, 1993
    Date of Patent: November 22, 1994
    Inventor: Jeng Keh-Lin