Patents by Inventor Lakshaman M. Walpita

Lakshaman 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).

  • Polymeric compositions having a temperature-stable dielectric constant
    Patent number: 5965273
    Abstract: A polymeric composition which has a dielectric constant K' greater than 4 at 20.degree. C. which varies little with temperature is made from a polymer or mixture of polymers and a ceramic or a mixture of ceramics, where the polymer or mixture of polymers has a dielectric constant K' in the range of about 1.5 to about 3.5 and a temperature coefficient of dielectric constant TCK' that is negative and is between 0 and about -300 ppm/degree C.; and the ceramic includes a first ceramic, which may be one ceramic or a mixture of ceramics, each having a dielectric constant in the range of about 15 to about 200 and a TCK' that is positive and is between zero and about 3000 ppm/degree C.; and an optional second ceramic, which may be one ceramic or a mixture of ceramics, each having a dielectric constant in the range from about 3 up to about 15 and a TCK' that is positive and is between zero and about 300 ppm/degree C.
    Type: Grant
    Filed: January 31, 1997
    Date of Patent: October 12, 1999
    Assignee: Hoechst Celanese Corporation
    Inventors: Lakshaman M. Walpita, Michael R. Ahern
  • Low dielectric materials
    Patent number: 5348990
    Abstract: A low dielectric material made of a liquid crystal polymer, polytetrafluoroethylene, and hollow glass spheres. This material is a relatively low cost, low dielectric blend having good physical strength and chemical and temperature resistance.
    Type: Grant
    Filed: March 2, 1993
    Date of Patent: September 20, 1994
    Assignee: Hoechst Celanese Corp.
    Inventors: Lakshaman M. Walpita, James B. Stamatoff, George Lundberg