Patents by Inventor Bernd Helpap

Bernd Helpap 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).

  • DEMERCURIZATION OF SOLUTIONS BY ULTRAFILTRATION
    Publication number: 20130284670
    Abstract: The present invention provides a process for removal of mercury from a solution by ultrafiltration with filtration membranes having a pore size of less than or equal to 0.25 ?m, for removing mercury from mercury-containing solutions, including alkali metal hydroxide solutions or alkali metal alkoxide solutions.
    Type: Application
    Filed: April 24, 2013
    Publication date: October 31, 2013
    Applicant: EVONIK DEGUSSA GMBH
    Inventors: Michael HORN, Bernd Helpap, Michael Thiel, Manfred Neumann
  • Inhibition of polymerization of vinylaromatic or vinylaliphatic
    Patent number: 5888356
    Abstract: The polymerization of a vinylaromatic or vinylaliphatic compound at elevated temperature in the absence of air is inhibited by processing the vinylaromatic or vinylaliphatic compound in the presence of 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl or 4-acetylamino-2,2,6,6-tetramethylpiperidine-N-oxylalone or in admixture with p-nitrosophenol or 2-methyl-4-nitrosophenol.
    Type: Grant
    Filed: October 7, 1997
    Date of Patent: March 30, 1999
    Assignee: Huels Aktiengesellschaft
    Inventors: Thomas Keil, Manfred Kaufhold, Bernd Helpap