Patents by Inventor Christopher A. Hersch

Christopher A. Hersch 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).

  • Apparatus for vacuum impulse forming of heated glass sheets
    Patent number: 6227008
    Abstract: Apparatus (20,120) for forming a heated glass sheet G is disclosed as including a vacuum mold (22,22a,122,122a) having a full surface (24,24a,124,124a) against which a peripheral mold (26,26a,126,126a) presses the glass sheet periphery and with which at least one vacuum reservoir (32,33) is communicated within the interior of the sealed glass sheet periphery to form the glass sheet to the shape of the vacuum mold surface. Valving (38) of a vacuum system (28) is preferably operable to provide the vacuum impulse in two stages with an initial limited extent of vacuum and a subsequent greater extent of vacuum by communication first with one vacuum reservoir (32) and subsequently with another vacuum reservoir (33). Different embodiments of the vacuum mold have the vacuum mold surface facing upwardly and downwardly with convex and concave shapes.
    Type: Grant
    Filed: August 28, 1996
    Date of Patent: May 8, 2001
    Assignee: Glasstech, Inc.
    Inventors: Donivan M. Shetterly, Christopher A. Hersch
  • Method for vacuum impulse forming of heated glass sheets
    Patent number: 5376158
    Abstract: Apparatus (20,120) for forming a heated glass sheet G is disclosed as including a vacuum mold (22,22a,122,122a) having a full surface (24,24a,124,124a) against which a peripheral mold (26,26a,126,126a) presses the glass sheet periphery and with which at least one vacuum reservoir (32,33) is communicated within the interior of the sealed glass sheet periphery to form the glass sheet to the shape of the vacuum mold surface. Valving (38) of a vacuum system (28) is preferably operable to provide the vacuum impulse in two stages with an initial limited extent of vacuum and a subsequent greater extent of vacuum by communication first with one vacuum reservoir (32) and subsequently with another vacuum reservoir (33). Different embodiments of the vacuum mold have the vacuum mold surface facing upwardly and downwardly with convex and concave shapes.
    Type: Grant
    Filed: November 19, 1992
    Date of Patent: December 27, 1994
    Assignee: Glasstech, Inc.
    Inventors: Donivan M. Shetterly, Christopher A. Hersch