Patents by Inventor Helmut Bergmann

Helmut Bergmann 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).

  • Device and method for pulling a single crystal of semiconductor material
    Patent number: 12116694
    Abstract: An apparatus is configured to pull a single crystal of semiconductor material from a melt contained in a crucible. The apparatus includes: a rotatable pulling shaft; a rotatable crucible shaft; a double worm gear between a drive and the pulling shaft; and a further double worm gear between a further drive and the crucible shaft.
    Type: Grant
    Filed: September 15, 2020
    Date of Patent: October 15, 2024
    Assignee: SILTRONIC AG
    Inventors: Rolf Schmid, Helmut Bergmann, Werner Joedecke
  • DEVICE AND METHOD FOR PULLING A SINGLE CRYSTAL OF SEMICONDUCTOR MATERIAL
    Publication number: 20220349086
    Abstract: An apparatus is configured to pull a single crystal of semiconductor material from a melt contained in a crucible. The apparatus includes: a rotatable pulling shaft; a rotatable crucible shaft; a double worm gear between a drive and the pulling shaft; and a further double worm gear between a further drive and the crucible shaft.
    Type: Application
    Filed: September 15, 2020
    Publication date: November 3, 2022
    Inventors: Rolf Schmid, Helmut Bergmann, Werner Joedecke
  • Tamperproof document and a process for producing the same
    Patent number: 4456667
    Abstract: The tamperproof document consists of a photographic material as information carrier which is laminated on one or both sides with a transparent foil. The foil is attached to the surface of the information carrier by a layer of adhesive containing poly-1,2-alkyleneimine. The document is eminently saft against falsification.
    Type: Grant
    Filed: July 26, 1982
    Date of Patent: June 26, 1984
    Assignee: Agfa-Gavaert Aktiengesellschaft
    Inventors: Richarda Bochow, Helmut Bergmann, Siegfried Eikemeier