Patents by Inventor Ingrid Liesch

Ingrid Liesch 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).

  • High pressure discharge lamp with improved arc tube retention structure
    Patent number: 4837477
    Abstract: To retain an arc tube (6, 16) in precise position with respect to an opti system (R) within an outer envelope (2, 12), the arc tube is retained at both ends by spiral springs (23) which have a cylindrical portion fitted in a sleeve-like current supply (7, 17) to the arc tube and having a conically expanding portion (25), terminating in an end portion (26) which is welded to a central guide pin (27) fitted and movable within the cylindrical portion (24) of the spring. The guide pin (27) can form part of an internal current supply (FIG. 3: 19) or be secured to an internal current supply lead (FIGS. 1, 2: 9).
    Type: Grant
    Filed: February 5, 1988
    Date of Patent: June 6, 1989
    Assignee: Patent Treuhand Gesellschaft fur elektrische Gluhlampen mbH
    Inventors: Joachim Dassler, Detlef Girod, Klaus Kramer, Ingrid Liesch