Patents by Inventor Donald J. Kelsey

Donald J. Kelsey 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).

  • Publication number: 20020084562
    Abstract: A symmetrical disk-shaped spring having two or more symmetrical, spiral-shaped webs connecting inner and outer rings is disclosed. The webs are defined between symmetrical, spiral-shaped slots that extend between the inner and outer rings. The spiral-shaped webs apply axial forces when the inner and outer rings are displaced axially relative to the each other. The symmetrical disk-shaped spring is made by machining a flat, disk-shaped piece of material. The spiral-shaped slots are machined through the thickness of the material, leaving the spiral-shaped web material to connect the outer and inner rings.
    Type: Application
    Filed: December 29, 2000
    Publication date: July 4, 2002
    Inventor: Donald J. Kelsey