Patents by Inventor Helmut Ludwig

Helmut Ludwig 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).

  • Device for decanting a pressurized liquid
    Patent number: 6024251
    Abstract: A device for decanting a pressurized liquid into packaging containers, such as ampules, vials, or the like, having a reservoir for the liquid and a distributor that is connected to the reservoir via a supply line. A sterilizing filter is interposed in the supply line. In order to make it possible for the distributor to be completely emptied, the device embodies a separate pressure connection which applies a second pressure on the distributor so that the liquid disposed in the distributor is acted on with a second gas pressure (P2).
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: February 15, 2000
    Assignee: Robert Bosch GmbH
    Inventors: Werner Mayer, Helmut Ludwig
  • N,N'-dialkyl-p-phenylenediamine mixture
    Patent number: 3968080
    Abstract: Dialkyl-p-phenylenediamine composition comprising first component of symmetrical N,N'-di(sec-hexyl)-p-phenylenediamine in less than 50% by weight of the total composition, second component of unsymmetrical N-(sec-hexyl)-N'-(sec-alkyl)-p-phenylenediamine having 7 or 8 carbon atoms in said sec-alkyl in amount greater than the first component and third component of symmetrical N,N'-di(sec-alkyl)-p-phenylenediamine having 7 or 8 carbon atoms in each alkyl group useful for preservation of organic materials.
    Type: Grant
    Filed: October 10, 1974
    Date of Patent: July 6, 1976
    Assignee: Monsanto Company
    Inventors: Helmut Ludwig Merten, Gene Ray Wilder