Patents by Inventor Joanne R. Mark

Joanne R. Mark 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).

  • Low dielectric constant ceramic materials
    Patent number: 5068210
    Abstract: A dense, sintered ceramic material having a low dielectric constant, a low firing temperature, and a low coefficient of thermal expansion is provided from a mixture of 0-30 wt. % alumina, 30-60 wt. % fused silica, and 30-70 wt. % of a glass comprised of PbO, B.sub.2 O.sub.3, and SiO.sub.2. The mixture has a minimum sintering temperature in the range of 800.degree.-900.degree. C., and can be formed by conventional manufacturing techniques. It is particularly useful for the fabrication of single or multilayer electronic circuit substrates.
    Type: Grant
    Filed: May 17, 1988
    Date of Patent: November 26, 1991
    Assignee: Tektronix, Inc.
    Inventors: John F. DiLazzaro, James L. McAlpin, Joanne R. Mark