Patents by Inventor Frank Otto Theubert

Frank Otto Theubert 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).

  • Lead/sulphuric acid-accumulator, separator for lead/sulphuric acid accumulators and process to reduce the formation of colored deposits in a lead/sulphuric acid accumulators
    Patent number: 6403264
    Abstract: An invention is described through which it is possible to reduce in quantity the coloured, mostly dark, and frequently adhesive deposits which form in lead accumulators with separators of filled poly-olefins during formation and operation. The essential feature is that the separators contain as plasticizer a process oil with a CA value of ≦6%, a sulphur content of ≦2000 ppm and a polar part of ≦1%. Preferred process oils to be used as plasticizers are relatively naphthenic and naphthenic oils.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: June 11, 2002
    Assignee: Daramic, Inc.
    Inventors: Hellmut Bünsch, Klaus Heinrich Ihmels, Frank Otto Theubert