Patents by Inventor Jonathan C. Springer

Jonathan C. Springer 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: 8672815
    Abstract: A barbell system having a center shaft with a first and second end, a first and second outer shaft, the ends telescopically received in an inner end of the outer shafts adjustable in length via a securing mechanism, retaining rings on outer ends of the outer shafts oriented in the same direction, each retaining ring having an outer ring, inner ring, a front and back surface which form an inner cavity, a track is in each inner ring extending through its entire circumference, a handle shaft having a first and second end which protrude through the track, a lip on both ends of the handle shaft to secure the ends within the inner cavity, bearings lining an internal surface of the inner ring and bearings lining an internal surface of each outer ring, and weight bearing shafts on the retaining rings opposite the outer shafts to removably engage a weight.
    Type: Grant
    Filed: November 9, 2011
    Date of Patent: March 18, 2014
    Inventor: Jonathan C. Springer