Patents by Inventor Irwin J. Seward, Jr.

Irwin J. Seward, Jr. 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 preparing polyamines with ion exchange resin catalysts
    Patent number: 4554378
    Abstract: Polyamines are prepared from aromatic amines and aliphatic aldehydes or ketones using cationic or acid ion exchange resins as a catalyst in an essentially oxygen-free atmosphere with the aromatic amines being distilled and protected from the atmosphere.
    Type: Grant
    Filed: February 22, 1983
    Date of Patent: November 19, 1985
    Assignee: The Dow Chemical Company
    Inventors: John L. Nafziger, Laura A. Rader, Irwin J. Seward, Jr.