Patents by Inventor John Francis Fierro

John Francis Fierro 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).

  • Aromatic polyamide fiber blend for protective clothing
    Patent number: 4120914
    Abstract: An intimate blend of aromatic polyamide staple fiber components comprising 45-55 weight percent poly(m-phenylene isophthalamide) fibers and 45-55 weight percent poly(p-phenylene terephthalamide) fibers whose stress-strain curve exhibits no yield point.
    Type: Grant
    Filed: February 4, 1977
    Date of Patent: October 17, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Wallace Peery Behnke, Robert Stuart Chapin, John Francis Fierro