Patents by Inventor Dennis G. Prough

Dennis G. Prough 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).

  • Vacuum side-folder section for envelope blank folding apparatus
    Patent number: 5094658
    Abstract: An envelope forming apparatus has a vacuum table with apertures through which a vacuum is applied onto the surface of the vacuum table. A series of parallel endless belts move across the vacuum table and transport an envelope blank across the vacuum table. The vacuum through the apertures in the vacuum table holds the blank on the belts as they move across the vacuum table and as the blank is folded by a plowshare folder located relative to the vacuum table. Alternatively, a single wide belt with apertures may be substituted for the series of parallel belts.
    Type: Grant
    Filed: March 5, 1991
    Date of Patent: March 10, 1992
    Assignee: F.L. Smithe Machine Company, Inc.
    Inventors: Elliot S. Smithe, Ronald G. Himmel, Dennis G. Prough