Patents by Inventor Petrus Johannes Scheulderman

Petrus Johannes Scheulderman 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).

  • Wheelchair frame and castor assembly
    Patent number: 5762155
    Abstract: A wheelchair frame comprises a base frame part (1, 2) with a plurality of wheels (3, 33), including two front wheels (3), wherein each of said front wheels can be driven by an electromotor (4). The base frame part carries at the back side a castor assembly (13) located in the center and comprising a swivel axle (14) with a neutral straight on position, wherein a device 22 is are provided for exerting a rotation force on the swivel axle in the direction of the straight on position at rotation of the swivel axle out of the straight on position.
    Type: Grant
    Filed: October 16, 1995
    Date of Patent: June 9, 1998
    Assignee: Richard van Seenus Nederland B.V.
    Inventor: Petrus Johannes Scheulderman