Patents by Inventor Bernhard Leibmann

Bernhard Leibmann 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).

  • Process for making-up polyamide resins solid at room temperature
    Patent number: 6232436
    Abstract: A process for granulating a polyamide resin involving: (a) providing an underwater granulating device having a heated multiple-bore die wherein the bores have an internal diameter ranging from 1.2 to 2.5 mm and a length of from 12 to 50 mm; (b) providing a polyamide resin melt having a viscosity, at 160° C., of less than 3,000 mPas; (c) cooling the polyamide resin melt to form a cooled polyamide resin; (d) introducing the cooled polyamide resin into and through the heated multiple-bore die to form an extrudate; (e) providing a source of water; (f) contacting the extrudate with the water to form a cooled extrudate; and (g) cutting the cooled extrudate into granules.
    Type: Grant
    Filed: September 15, 1999
    Date of Patent: May 15, 2001
    Assignee: Cognis Deutschland GmbH
    Inventors: Wilhelm Beck, Bernhard Leibmann, Aike Niemann, John D. Snyder, Kenneth Bicknell, Michael Mahler