Patents by Inventor Johann Pfaffel

Johann Pfaffel 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).

  • Electrode with a helical attachment
    Patent number: 6201349
    Abstract: An electrode for electrical lamps comprises a core pin with a pushed-on helical member. A boss (9) projecting beyond the diameter of the core pin (7) is laterally constructed on the core pin at a spacing from the tip, the helical member (8) being arranged with at least one turn behind the boss.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: March 13, 2001
    Assignee: Patent-Truehand-Gesellschaft fuer elektrische Gluelampen mbH
    Inventor: Johann Pfaffel