Patents by Inventor Rodney E. Schapel

Rodney E. Schapel 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).

  • Manhole cover
    Patent number: 5378078
    Abstract: The improved manhole cover of this invention provides a strong yet lightweight access cover structure made from a series of radially staggered ply layers bonded above and below a homogenous frusto-conical core portion with resin, each ply layer made from an array of radially staggered unidirectional fiber tape.
    Type: Grant
    Filed: October 15, 1992
    Date of Patent: January 3, 1995
    Inventors: Michael E. Lewis, Richard C. Lewis, Rodney E. Schapel