Patents by Inventor Roswitha Kreiner

Roswitha Kreiner 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: 5614448
    Abstract: The invention relates to a porcelain with a transparency and strength properties of a hard porcelain, characterized by a phosphate-containing glass phase as well as the predominance of unreacted quartz bodies [sic; grains] in the matrix. The invention relates to a porcelain batch composition as well as to a method for the manufacture of the porcelain.
    Type: Grant
    Filed: March 27, 1995
    Date of Patent: March 25, 1997
    Assignee: Rosenthal Aktiengesellschaft
    Inventor: Roswitha Kreiner
  • Patent number: 5455210
    Abstract: The invention relates to a porcelain with a transparency and strength properties of a hard porcelain, characterized by a phosphate-containing glass phase as well as the predominance of unreacted quartz grains in the matrix. The invention relates to a porcelain batch composition as well as to a method for the manufacture of the porcelain.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: October 3, 1995
    Assignee: Rosenthal Aktiengesellschaft
    Inventor: Roswitha Kreiner
  • Patent number: 4521356
    Abstract: Ceramic flatware handles of hard porcelain, aluminum oxide, silicon carbide or titanium oxide, with a center bore for receiving the tang, wherein the surface of the flatware handle is provided with a press-molded relief pattern. Flatware handles of this type are obtained by mixing the ceramic raw materials with a thermoplastic plasticizing agent and shaping them into blanks at 90.degree. to 150.degree. C. The blanks are then given their surface profile by means of a press molding device and thereafter fired. Such a process is particularly suitable for oval flatware handles and handles having a center bore which is to be equipped with ceramic screw threads.
    Type: Grant
    Filed: May 17, 1982
    Date of Patent: June 4, 1985
    Assignee: Rosenthal Aktiengesellschaft
    Inventors: Hartmut Keller, Axel Krauth, Roswitha Kreiner