Patents by Inventor Stephen W. Freiman

Stephen W. Freiman 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).

  • TRANSPARENT MATERIALS HAVING ENHANCED RESISTANCE TO CRACK GROWTH
    Publication number: 20100310856
    Abstract: Embodiments relate to a transparent body comprising a matrix material and a plurality of non-metal particles positioned in the matrix material. The matrix material may be selected from the group consisting of glass materials, ceramic materials, and semiconductor materials. The non-metal particles may have a mean particle size of no greater than 150 nm. The non-metal particles may be present in the body at a volume fraction of no greater than 3 percent. The non-metal particles may have a composition different than that of the matrix. Other embodiments are described and claimed.
    Type: Application
    Filed: June 4, 2010
    Publication date: December 9, 2010
    Inventor: Stephen W. Freiman
  • Ablative-resistant dielectric ceramic articles
    Patent number: 4304870
    Abstract: A tough, ablative-resistant, dielectric ceramic material is constructed using powder metallurgy techniques. The composite comprises a boron nitride particulate phase immersed in an Al.sub.2 O.sub.3 matrix. The boron nitride particles are preferably 3-5 microns in size, and create the capability of sustaining thermal strains without generating the thermal stresses that lead to material failure. The composite displays superior mechanical strength characteristics.
    Type: Grant
    Filed: February 20, 1980
    Date of Patent: December 8, 1981
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Roy W. Rice, William J. McDonough, Stephen W. Freiman, John J. Mecholsky, Jr.