Patents by Inventor Ralf Watkowiak

Ralf Watkowiak 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).

  • Closure systems for chromatographic columns
    Patent number: 6090190
    Abstract: A device for establishing a flange connection, having a bearing which can act on a first flange, a counter-bearing which can act on a second flange, and a connecting lever between the two bearings is described. The invention is distinguished by the fact that the connecting lever is a lever with a drawing element. The drawing element and the lever each have a first and second end. The drawing element's first end engages the bearing and its second end jointedly mounts in between the first and second ends of the lever. The counter-bearing has at least one contact location for the first end of the lever and a recess for the drawing element.
    Type: Grant
    Filed: December 11, 1998
    Date of Patent: July 18, 2000
    Assignee: Hoechst Marion Roussel Deutschland GmbH
    Inventors: Alfons Enhsen, Ralf Watkowiak