Patents by Inventor Robert J. Bartkowicz

Robert J. Bartkowicz 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).

  • Patent number: 5035428
    Abstract: A rotating grip comprising a non-slip outer surface and a high slip inner surface and which can be installed on the handle of a baseball bat to enhance the user thereof, is described. The grip can be covered by a conventional sleeve-type grip and has a novel notching means to hold the rotating grip in place. When used, the rotating grip enables the proper alignment of the hands to occur automatically and thus create a level and smooth swing. This swing will insure more direct hits on the baseball.
    Type: Grant
    Filed: December 13, 1989
    Date of Patent: July 30, 1991
    Inventor: Robert J. Bartkowicz
  • Patent number: 5011145
    Abstract: A baseball bat having a handle adjacent an end of the bat. An upper hand grip is rotatably mounted on the handle to allow a more natural swing than is available with conventional fixed-grip arrangements. A fixed lower hand grip acts as a spacer for positioning the upper hand grip a desired distance from the end of the bat. The upper hand grip has an inner sleeve with a low friction inner surface permitting rotation of the inner sleeve on the baseball bat handle, and a resilient outer sheath for urging the inner sleeve against the bat handle.
    Type: Grant
    Filed: September 4, 1987
    Date of Patent: April 30, 1991
    Inventor: Robert J. Bartkowicz