Patents by Inventor Bernd Roman Keller

Bernd Roman Keller 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 size classifying ammonium sulfate crystals which are present in a suspension
    Patent number: 7380671
    Abstract: The invention relates to a process for size classifying ammonium sulfate crystals using a screen, said process comprising feeding a feed suspension to the screen, said feed suspension comprising said ammonium sulfate crystals in an ammonium sulfate solution, size classifying the ammonium sulfate crystals, and keeping both sides of the screen immersed in liquid during said size classifying.
    Type: Grant
    Filed: April 5, 2002
    Date of Patent: June 3, 2008
    Assignee: DSM IP Assets B.V.
    Inventors: Natasja Anouk Loomans-V. D. Anker, Andreas Oliver Mittenzwei, Bernd Roman Keller, Lianne Van Oord
  • Process for separation and recovery of waste carpet components
    Patent number: 5722603
    Abstract: A process for separating and recovering waste carpet material components, especially face fiber material, includes removing adhesive material from the waste carpet material feedstock to obtain a mixture containing face fiber material which is passed with a liquid medium to a hydrocyclone, where the solids in the mixture are separated on the basis of specific gravity, and recovered. The recovered components can then be processed into desired products.
    Type: Grant
    Filed: November 28, 1995
    Date of Patent: March 3, 1998
    Assignee: AlliedSignal Inc. /DSM N.V.
    Inventors: Michael Robert Costello, Bernd Roman Keller