Patents by Inventor Thomas K. Bednarz

Thomas K. Bednarz 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).

  • Electrically conductive ceramics and their use in fiber charging apparatus
    Patent number: 5601853
    Abstract: A conductive ceramic composition is disclosed which consists essentially of alumina, chromia, and magnesia, and is suitable for use as target electrodes in electrostatic fiber charging applications. Ceramics are disclosed which have exhibit volume resistivities of 10.sup.12 ohm-cm or less at 20.degree. C., and have excellent electrical stability and superior mechanical properties; and an electrostatic charging apparatus is disclosed which employs a ceramic electronic conductor having a volume resistivity of from about 1.times.10.sup.7 to 5.times.10.sup.10 ohm-cm and a hardness of at least 5 GPa.
    Type: Grant
    Filed: March 7, 1995
    Date of Patent: February 11, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Thomas K. Bednarz, Kurt R. Mikeska
  • Coating for aerodynamic shield in apparatus for making non-woven web
    Patent number: 4148595
    Abstract: The aerodynamic shield members of the apparatus for electrostatically charging fibrous material disclosed in U.S. Pat. No. 3,860,369 are coated with a material having a resistance of between 5.times. 10.sup.12 and 10.sup.14 ohms/sq to reduce arcing at higher charge levels.
    Type: Grant
    Filed: September 28, 1977
    Date of Patent: April 10, 1979
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Thomas K. Bednarz