Patents by Inventor Karl-Heinz Hilgert

Karl-Heinz Hilgert 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).

  • Nucleating agents (pore regulators) for the preparation of directly gassed thermoplastic foams
    Patent number: 5225107
    Abstract: The invention relates to new nucleating agents for the preparation of directly gassed thermoplastic foams. The new agents comprise a combination of citric acid, the salts or esters thereof and carbonate or bicarbonate and talc.
    Type: Grant
    Filed: September 23, 1992
    Date of Patent: July 6, 1993
    Assignee: Boehringer Ingelheim GmbH
    Inventors: Gunther Kretzschmann, Dieter Scholz, Karl-Heinz Hilgert
  • Citric acid esters as blowing and nucleating agents in the processing plastics
    Patent number: 4572740
    Abstract: The invention relates to new blowing and nucleating agents for the processing of plastics, which are based on mono- and diesters of citric acid.
    Type: Grant
    Filed: March 26, 1985
    Date of Patent: February 25, 1986
    Assignee: Boehringer Ingelheim KG
    Inventors: Gunther Kretzschmann, Dieter Scholz, Karl-Heinz Hilgert