Patents by Inventor Dietrich Helm

Dietrich Helm 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).

  • Mixed amine-phenol hardeners for epoxy resins
    Patent number: 3954762
    Abstract: Association products, useful as a hardener for epoxy resins, formed betweenA. a liquid polyamine having 3 - 5 amino hydrogen atoms;B. a liquid primary monoamine; andC. a liquid alkylmonophenol.Adducts formed between this association product and an epoxy resin.Methods of hardening an epoxy resin, with or without intermediate formation of an adduct, using the aforementioned association products.
    Type: Grant
    Filed: July 11, 1974
    Date of Patent: May 4, 1976
    Assignee: Schering AG.
    Inventor: Dietrich Helm