Patents by Inventor Gregory J. Sapletal

Gregory J. Sapletal 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).

  • Patent number: 5844518
    Abstract: The microwave absorption performance of a fiber loaded thermoplastic syntactic material is improved by geometrically reshaping the surface into a waffle shape. Starting with a fiber loaded version of thermoplastic syntactic foam, the front face geometry is then modified. Typically, the angle and frequency response is a function of both the front face angle and the skin thickness. These effects are minimized in this concept by using a pyramidal surface in which the field enters the material normal to at least one surface at almost all incident angles. The attenuation is over 20 dB, from S through Ku bands, over a broad angle range of up to 75 degrees off normal. An added benefit is that this system has a rigidity that is suitable for many structural applications.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: December 1, 1998
    Assignee: McDonnell Douglas Helicopter Corp.
    Inventors: Donald J. Berg, Carl A. Mentzer, David A. Brooker, Gregory J. Sapletal