Patents by Inventor Marshall E. Johns

Marshall E. Johns 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).

  • Corrosion inhibitors
    Patent number: 4631138
    Abstract: Triazones and triazine thiones are disclosed as corrosion inhibitors for ferrous metals.
    Type: Grant
    Filed: February 7, 1985
    Date of Patent: December 23, 1986
    Assignee: Petrolite Corporation
    Inventors: Marshall E. Johns, Keith D. Strassner, Thomas G. Braga