Patents by Inventor Christopher J. Willems

Christopher J. Willems 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 pushrim
    Patent number: 7497456
    Abstract: A pushrim with increased surface area and an insert between the wheel and the pushrim. In the preferred embodiment, the cross-section of the pushrim is an elongated circle and the insert is a concave trough made of an elastic material which compressibly fits between the wheel and the rim for convenient installation. Improved pushing is provided by texturing the surface of the insert to provide increased friction. Improved braking is provided by providing a smoother and wider surface on the pushrim.
    Type: Grant
    Filed: October 29, 2003
    Date of Patent: March 3, 2009
    Inventors: Christopher J. Willems, Mark Baldwin, Michael L. Boninger, Rory A. Cooper
  • Wheelchair pushrim
    Publication number: 20040103745
    Abstract: A pushrim with increased surface area and an insert between the wheel and the pushrim. In the preferred embodiment, the cross-section of the pushrim is an elongated circle and the insert is a concave trough made of an elastic material which compressibly fits between the wheel and the rim for convenient installation. Improved pushing is provided by texturing the surface of the insert to provide increased friction. Improved braking is provided by providing a smoother and wider surface on the pushrim.
    Type: Application
    Filed: October 29, 2003
    Publication date: June 3, 2004
    Inventors: Christopher J. Willems, Mark Baldwin, Michael L. Boninger, Rory A. Cooper