Patents by Inventor Jurgen Ruhoff

Jurgen Ruhoff 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).

  • Separator for sealed lead accumulators
    Patent number: 6124059
    Abstract: The invention relates to microporous battery separators based on an essentially homogeneous mixture of a thermoplastic polymer, an inert filler and optionally a plasticizer. The separators contain, as filler, pyrogenic silica in a quantity of more than 20 vol. % and optionally one or more further fillers, so that the filler content overall is more than 60 up to a maximum of 82 vol.-%. The separators are suitable in particular for the manufacture of sealed accumulators.
    Type: Grant
    Filed: September 1, 1998
    Date of Patent: September 26, 2000
    Assignee: Daramic, Inc.
    Inventors: Werner Bohnstedt, Jorg Deiters, Klaus H. Ihmels, Jurgen Ruhoff
  • Process for repairing battery separators
    Patent number: 5773079
    Abstract: Process for repairing manufacturing defects in porous separator webs for accumulators in which a repair material is deposited in targeted manner onto the defect in-line repair as production of the separator web proceeds and the defect is thus sealed, or in which the defect is heated in-line at certain points and thereby welded. Suitable as repair materials are in particular polymers and/or resins dispersible in a dispersion agent, polymerizable materials and hot-melts. Welding preferably takes place using ultrasonics.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: June 30, 1998
    Assignee: Daramic, Inc.
    Inventors: Werner Bohnstedt, Klaus Heinrich Ihmels, Karsten Fischer, Jurgen Ruhoff