Patents by Inventor Edwin K. Ziegenfuss

Edwin K. Ziegenfuss 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).

  • Portable instrument for recording electrical load current and operating duration
    Patent number: 3950759
    Abstract: Self-contained portable recording instrument is particularly useful at field sites for recording the magnitude of both welding current and operating duration. A second embodiment is adapted to record the magnitude of welding current, voltage and operating duration. Strip chart records provide analysts with means for determining operator incentive pay when working on field assignments. Records enable determining the quality and duration of actual welds, as well as the occurrence of operator-simulated welding time.
    Type: Grant
    Filed: January 8, 1975
    Date of Patent: April 13, 1976
    Assignee: Bethlehem Steel Corporation
    Inventor: Edwin K. Ziegenfuss