Patents by Inventor Donald E. Schram

Donald E. Schram 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: 4722531
    Abstract: A take-down hollow shaft arrow assembly having a threadedly engageable insert portion affixed within each of two portions of a hollow arrow shaft enabling an arrow to be reduced to about half of its original length for transport or storage while retaining its original flight characteristics upon reassembly. The threadedly engaged insert abutable portions are axially spaced when the hollow arrow shaft ends firmly abut. At least one-third of the length of one of the inserts extends from one shaft portion and fits snugly into the other shaft portion. An alignment cylinder provides both accurate alignment and enhanced rigidity to the reassembled arrow shaft and resists bending of the arrow shaft upon impact with a hard object.
    Type: Grant
    Filed: August 30, 1982
    Date of Patent: February 2, 1988
    Inventor: Donald E. Schram