Patents by Inventor Karl Hartwig Richert

Karl Hartwig Richert 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).

  • Polyurethanes based on aromatic polyamines
    Patent number: 4016143
    Abstract: Aromatic di- and triamines are disclosed which amines are prepared by reacting isatoic acid anhydride with a compound containing at least two hydroxyl groups and at least one tertiary nitrogen group and having a molecular weight of from about 119 to about 1000. These amines are especially suited for preparing polyurethane resins by reaction with polyisocyanates.
    Type: Grant
    Filed: May 18, 1976
    Date of Patent: April 5, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventors: Johannes Blahak, Erwin Muller, Karl Hartwig Richert
  • Aromatic amines formed by the reaction of isatoic acid anhydride with compounds containing at least one tertiary nitrogen atom and at least two hydroxyl groups
    Patent number: 3975428
    Abstract: Aromatic di- and triamines are disclosed which amines are prepared by reacting isatoic acid anhydride with a compound containing at least two hydroxyl groups and at least one tertiary nitrogen group and having a molecular weight of from about 119 to about 1000. These amines are especially suited for preparing polyurethane resins by reaction with polyisocyanates.
    Type: Grant
    Filed: February 6, 1974
    Date of Patent: August 17, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Johannes Blahak, Erwin Muller, Karl Hartwig Richert