Patents by Inventor Franz Zwingl

Franz Zwingl 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).

  • Stopper plug for storage batteries
    Patent number: 6368741
    Abstract: A plug for batteries, especially for lead storage batteries is described in which gas exchange occurs through a liquid-impermeable and gas-permeable element (2) and in which an aerosol separator (3) is arranged between the element (2) and the gas space above the electrolyte. The aerosol separator according to the invention can be a centrifugal separator, a cascade separator, or an inertial separator or consist of a combination of at least two of the aforementioned.
    Type: Grant
    Filed: November 4, 1999
    Date of Patent: April 9, 2002
    Inventors: Josef Hackel, Norbert Maleschitz, Franz Zwingl, Thorsten Wiemer