Patents by Inventor Hayden I. Lipp

Hayden I. Lipp 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).

  • Methyl methacrylate production
    Patent number: 4668818
    Abstract: In the process for the preparation of methyl methacrylate, the addition of aromatic diamine in an acidic environment reduces yellow color in the polymerized product.
    Type: Grant
    Filed: June 18, 1985
    Date of Patent: May 26, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Hayden I. Lipp, Richard H. Squire