Patents by Inventor Lak M. Walpita

Lak M. Walpita 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).

  • Liquid crystalline polymer composites having high dielectric constant
    Patent number: 5962122
    Abstract: Polymeric compositions having a high dielectric constant are made from a thermotropic liquid crystalline and a ceramic having a dielectric constant which is greater than about 50 at a frequency of 1.0 GHz. The compositions have a dielectric constant of at least about 4, and preferably at least about 6. Preferred compositions also have a low loss tangent.
    Type: Grant
    Filed: November 28, 1995
    Date of Patent: October 5, 1999
    Assignee: Hoechst Celanese Corporation
    Inventors: Lak M. Walpita, William M. Pleban, Helmut Eckhardt
  • Transparent polymer composites having a low thermal expansion coefficient
    Patent number: 5783624
    Abstract: Polymeric compositions having a high transparency, low thermal expansion coefficient and low coefficient of refractive index change with temperature are made from a suitable thermoplastic polymer and index-matched glass or ceramic. Such compositions have utility in optical applications.
    Type: Grant
    Filed: December 13, 1996
    Date of Patent: July 21, 1998
    Assignee: Hoechst Celanese Corporation
    Inventors: Garo Khanarian, Lak M. Walpita
  • Polymeric compositions having a temperature-stable dielectric constant
    Patent number: 5739193
    Abstract: A polymeric composition having a high dielectric constant which varies little with temperature is made from a thermoplastic polymer, a high dielectric ceramic having a dielectric constant of at least about 50 at 1.0 Ghz and 20.degree. C., and a second ceramic material having a dielectric constant of at least about 5.0 at 1.0 GHz and 20.degree. C., where the high dielectric ceramic and the second ceramic material have temperature coefficients that are opposite in sign from one another.
    Type: Grant
    Filed: May 7, 1996
    Date of Patent: April 14, 1998
    Assignee: Hoechst Celanese Corp.
    Inventors: Lak M. Walpita, Paul N. Chen, Sr., Harris A. Goldberg, Christopher Zipp