Patents by Inventor David Vadney

David Vadney 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: 4844852
    Abstract: Method and apparatus for forming a web of uncut thermoplastic articles from a sheet of material and severing the uncut articles from the web of unseparated articles by precisely locating the unseparated articles with respect to a cutting tool and, once located, cutting the product from the web. Male locating pins included as part of the trimmer and spaced a known distance from the cutting edge move forward to engage web deformations. The forward movement of the male locating pin delivers sufficient force to the deformations to center them on the male locating pin. Continued forward movement forces the other side of the deformation into contact with a female locating pin included as part of the die and spaced the same known distance from the die edge. The female locating pin grabs the deformation to place the sheet in the desired location.
    Type: Grant
    Filed: December 1, 1987
    Date of Patent: July 4, 1989
    Assignee: Mobil Oil Corporation
    Inventors: Stephen R. Keyser, David Vadney