Patents by Inventor John Bushmaker

John Bushmaker 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).

  • Method of perforating a web
    Patent number: 6010090
    Abstract: An elongated web of paper is perforated along a plurality of transverse lines to provide bands of web areas having relatively high tensile strength which extend generally longitudinally along the web. The lines of perforation can be formed by staggered perforation lines which contain groups of perforations which are separated by unperforated areas or by staggered perforation lines which include groups of perforations having relatively low tensile strength which are separated by groups of perforations having relatively high tensile strength.
    Type: Grant
    Filed: December 11, 1998
    Date of Patent: January 4, 2000
    Assignee: Paper Converting Machine Co.
    Inventors: John Bushmaker, Richard J. Charles, Lawrence D. Mikulsky