Patents by Inventor Henricus T. J. Janssen

Henricus T. J. Janssen 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 with tilt compensating side frames
    Patent number: 5064211
    Abstract: Wheelchair with four wheels, with two side frames (1,2) and a middle frame (3,4) carrying the seat, both side frame (1,2) being connected to each other by means of the middle frame (3,4) in such a way that tilting of one of the side frames in one direction is followed by tilting of the other side frame through the same angle in the other direction, while the middle frame remains stationary.
    Type: Grant
    Filed: April 9, 1990
    Date of Patent: November 12, 1991
    Assignee: Huka Developments B.V.
    Inventors: Aloysius G. Huttenhuis, Henricus T. J. Janssen
  • Electrically driven wheelchair with worktop and control unit
    Patent number: 4913257
    Abstract: Electrically driven wheelchair with an essentially horizontal worktop (7) and a control unit (1) connected thereto, said control unit in the operational position fits into a corresponding aperture in the worktop and is connected to the worktop in such a way that it pivots and slides in a horizontal plane, and after pivoting and sliding the bottom side of the control unit fills the gap in the worktop.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: April 3, 1990
    Assignee: Huka Developments B.V.
    Inventor: Henricus T. J. Janssen
  • Wheelchair with tilting seat part
    Patent number: 4759561
    Abstract: Wheelchair comprising an underframe with front and rear wheels, and a seat part (1) which is adjustable relative to the underframe, which seat part (1) can be tilted forward and backward relative to the underframe in such a way that the overall center of gravity (6) of seat part (1) and wheelchair user (5) essentially assumes a fixed position relative to the underframe.
    Type: Grant
    Filed: June 1, 1987
    Date of Patent: July 26, 1988
    Assignee: Huka Developments B.V.
    Inventor: Henricus T. J. Janssen