Patents by Inventor Robert L. Keener

Robert L. Keener 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).

  • Ring sizer
    Patent number: 4964222
    Abstract: A ring sizer which closely conforms to any ring shape thereby permitting correct sizing of a ring being measured. At least the surface portions of the ring sizer are elastic and adapted to distort locally to the extent necessary for complete conformity with the inner surface of a ring placed thereon and in frictional contact therewith.
    Type: Grant
    Filed: January 19, 1990
    Date of Patent: October 23, 1990
    Inventor: Robert L. Keener