Patents by Inventor Ludwig J. Bondgen

Ludwig J. Bondgen 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).

  • Electric lamp having lamp vessel with improved pinch seal
    Patent number: 6031331
    Abstract: The electric lamp has a quartz glass lamp vessel (1) having first and second neck-shaped portions (2, 3) with first and second seals (4, 5). Current supply conductors (6, 7, 8; 9, 10, 11) consist of a metal foil (7, 10) embedded in the respective seal (4, 5), an inner (6, 9) and an outer current wire (8, 11) connected hereto. A seal ends with a closed fracture surface (14) through which an outer current wire (8, 11) extends. Favorably, the edge (13) of the fracture surface (14) has some small indentations (16) adjacent the origin of the fracture (19). The total length of the lamp is about 2 mm less than that of its conventional counterpart.
    Type: Grant
    Filed: September 29, 1998
    Date of Patent: February 29, 2000
    Assignee: U.S. Phillips Corporation
    Inventors: Wilfried L. Kohlmann, Ludwig J. Bondgen