Patents by Inventor Robert R. Dill

Robert R. Dill 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).

  • Crimped thermoplastic fibers for reinforcing concrete
    Patent number: 5985449
    Abstract: A crimped thermoplastic fiber for use in reinforcing concrete has a length in the range of 1/4 inch to 4 inches; an outer diameter in the range of 4 mils to 30 mils; a crimp frequency of 10-30 crimps per inch and an amplitude in the range of 1/2 mil-10 mils. The invention also includes a cylindrical bundle of the aforementioned fibers retained within an outer paper wrapper that dissolves and/or disintegrates within a concrete mixer in which the wrapped bundles are dispersed.
    Type: Grant
    Filed: October 8, 1997
    Date of Patent: November 16, 1999
    Assignee: Specialty Filaments
    Inventor: Robert R. Dill