Patents by Inventor Richard K. Zwart

Richard K. Zwart 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: 5645228
    Abstract: The invention features three types of shielding for rotary spreaders. The shields protect the user against spreader blow-back, i.e., most materials that are radially thrust outwardly from the rotary paddle of the spreader, are blocked from impinging upon the operator. The different shields of this invention are: (a) a molded, thin, clear, plastic plate; (b) a V-shaped, thin, clear, plastic plate; and (c) a rectangular-shaped, wrap-around, thin, clear, plastic housing having a protective top plate. Each shield plate attaches to the tubular frame at the rear of the spreader by removable, semi-circular tube/conduit fasteners for ease of assembly or removal. The shield plate can also be attached by permanently fixtured screw fasteners.
    Type: Grant
    Filed: March 15, 1995
    Date of Patent: July 8, 1997
    Assignee: Herman N. Zwart
    Inventor: Richard K. Zwart