Patents by Inventor Helmut Katz

Helmut Katz 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: 3998526
    Abstract: A liquid crystal display screen having at least one liquid crystal cell and operating in a reflective mode of operation characterized by the screen having at least a pair of tandemly arranged chambers with all but one chamber being provided with transparent electrically conductive layers to provide electrode patterns for acting on liquid crystal material disposed therein, the remaining chamber being filled with a partially to completely reflecting medium which medium is inserted into the chamber while in either the gaseous or liquid state.
    Type: Grant
    Filed: July 2, 1975
    Date of Patent: December 21, 1976
    Assignee: Siemens Aktiengesellschaft
    Inventor: Helmut Katz
  • Patent number: 3992082
    Abstract: A compound liquid crystal indicator screen having at least two liquid crystal cells which are arranged in tandem directly behind one another in a direction of a light beam characterized by a pair of glass outer plate members with at least one very thin transparent carrier foil member, a plurality of strip elements spacing the members to form a stack of spaced members and a glass solder sealing the periphery or marginal edges of the members to provide a plurality of spaced chambers with adjacent chambers being separated by the foil member and each chamber containing a liquid crystal layer to form one of the liquid crystal cells.
    Type: Grant
    Filed: January 29, 1975
    Date of Patent: November 16, 1976
    Assignee: Siemens Aktiengesellschaft
    Inventor: Helmut Katz