Patents by Inventor Marian Cholewa

Marian Cholewa 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).

  • Radiation detector having coated nanostructure and method
    Patent number: 7388201
    Abstract: A radiation detector has an electron emitter that includes a coated nanostructure on a support. The nanostructure can include a plurality of nanoneedles. A nanoneedle is a shaft tapering from a base portion toward a tip portion. The tip portion has a diameter between about 1 nm to about 50 nm and the base portion has a diameter between about 20 nm to about 300 nm. Each shaft has a length between about 100 nm to about 3,000 nm and an aspect ratio larger than 10. A coating covers at least the tip portions of the shafts. The coating exhibits negative electron affinity and is capable of emitting secondary electrons upon being irradiated by radiation. The nanostructure can also include carbon nanotubes (CNTs) coated with a material selected from the group of aluminum nitride (AlN), gallium nitride (GaN), and zinc oxide (ZnO).
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: June 17, 2008
    Assignees: National University of Singapore, Agency for Science, Technology and Research, Pohang University of Science and Technology, Nanyang Technological University
    Inventors: Marian Cholewa, Shu Ping Lau, Gyu-Chul Yi, Jin Kyoung Yoo, Adrian Paul Burden, Lei Huang, Xingyu Gao, Andrew Thye Shen Wee, Herbert Oskar Moser
  • Radiation detector having coated nanostructure and method
    Publication number: 20060255287
    Abstract: A radiation detector has an electron emitter that includes a coated nanostructure on a support. The nanostructure can include a plurality of nanoneedles. A nanoneedle is a shaft tapering from a base portion toward a tip portion. The tip portion has a diameter between about 1 nm to about 50 nm and the base portion has a diameter between about 20 nm to about 300 nm. Each shaft has a length between about 100 nm to about 3,000 nm and an aspect ratio larger than 10. A coating covers at least the tip portions of the shafts. The coating exhibits negative electron affinity and is capable of emitting secondary electrons upon being irradiated by radiation. The nanostructure can also include carbon nanotubes (CNTs) coated with a material selected from the group of aluminum nitride (AlN), gallium nitride (GaN), and zinc oxide (ZnO).
    Type: Application
    Filed: May 13, 2005
    Publication date: November 16, 2006
    Inventors: Marian Cholewa, Shu Lau, Gyu-Chul Yi, Jin Yoo, Adrian Burden, Lei Huang, Xingyu Gao, Andrew Shen Wee, Herbert Moser