Patents by Inventor Hans S. Hartmann

Hans S. Hartmann 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).

  • Crystallizable, low dielectric constant, low dielectric loss composition
    Patent number: 5024975
    Abstract: A variable TCE composition for making dielectric layers having low dielectric constant and low dielectric loss, the composition comprising an admixture of finely divided solids comprising amorphous crystallizable glass, amorphous borosilicate frit, ceramic expansion control additive, and crystallization control additive. The dielectric layers are useful in circuits especially for high density and high frequency applications.
    Type: Grant
    Filed: October 19, 1989
    Date of Patent: June 18, 1991
    Assignee: E. I. Du Pont de Nemours and Co., Inc.
    Inventor: Hans S. Hartmann
  • Preforms for reinforcement of battery grids
    Patent number: 4487792
    Abstract: Network preforms for battery grids are prepared from cross-lapped assemblages of spaced bundles of inorganic filaments which are bonded at crossover points.
    Type: Grant
    Filed: June 21, 1982
    Date of Patent: December 11, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Hans S. Hartmann
  • Lead coated alumina fiber and lead matrix composites thereof
    Patent number: 4282922
    Abstract: Lead-coated alumina fibers which are obtained by reduction of lead oxide in a glass coating on alumina fibers are particularly useful for making strong lead matrix composites.
    Type: Grant
    Filed: May 16, 1980
    Date of Patent: August 11, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Hans S. Hartmann