Patents by Inventor William A. Null

William A. Null 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).

  • Vehicle having an anti-dive/lockout mechanism
    Publication number: 20040094944
    Abstract: A suspension for a vehicle is provided. The suspension includes, for example, a frame and a releasable locking assembly. The releasable locking assembly has, for example, a first assembly movably coupled to the frame, a second assembly movably coupled to the frame, and wherein movement of the frame relative to the first and second assemblies causes the first and second assemblies to engage each other to limit further movement of the frame in at least a first direction.
    Type: Application
    Filed: August 18, 2003
    Publication date: May 20, 2004
    Inventors: Gerald Goertzen, William A. Null
  • Obstacle traversing wheelchair
    Publication number: 20030168264
    Abstract: The present invention provides a curb-climbing wheelchair having pivotal arm assemblies. The pivotal arm assemblies include at least one front caster and have the ability to rotate or pivot. The pivot arms rotate or pivot in response to moments generated by accelerating or decelerating the wheelchair thereby raising or lowering the front caster(s) through the rotational movement of the pivot arms. By raising or lowering the front caster(s) in such a manner, curb-like obstacles can be traversed in a low-impact manner.
    Type: Application
    Filed: March 17, 2003
    Publication date: September 11, 2003
    Inventors: Gerold Goertzen, William A. Null
  • Obstacle traversing wheelchair
    Publication number: 20030168265
    Abstract: The present invention provides a curb-climbing wheelchair having pivotal arm assemblies. The pivotal arm assemblies include at least one front caster and have the ability to rotate or pivot. The pivot arms rotate or pivot in response to moments generated by accelerating or decelerating the wheelchair thereby raising or lowering the front caster(s) through the rotational movement of the pivot arms. By raising or lowering the front caster(s) in such a manner, curb-like obstacles can be traversed in a low-impact manner.
    Type: Application
    Filed: March 17, 2003
    Publication date: September 11, 2003
    Inventors: Gerold Goertzen, William A. Null
  • Obstacle traversing wheelchair
    Patent number: 6554086
    Abstract: A curb-climbing wheelchair having pivotal arm assemblies. The pivotal arm assemblies include at least one front caster and have the ability to rotate or pivot. The pivot arms rotate or pivot in response to moments generated by accelerating or decelerating the wheelchair thereby raising or lowering the front caster(s) through the rotational movement of the pivot arms. By raising or lowering the front caster(s) in such a manner, curb-like obstacles can be traversed in a low-impact manner.
    Type: Grant
    Filed: October 27, 2000
    Date of Patent: April 29, 2003
    Assignee: Invacare Corporation
    Inventors: Gerold Goertzen, William A. Null, Jr.