Patents by Inventor John W. Zeller

John W. Zeller 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: 11674851
    Abstract: A high-performance Microbolometer that incorporates vanadium oxide (VOx) along with carbon nanotubes (CNTs) or graphene. This Microbolometer, which uses a microbridge comprising Si3N4 and VOx, provides low noise and high dynamic range longwave infrared (LWIR) band detection. Addition of CNTs/graphene provides a high level of performance [low 1/f noise, noise equivalent temperature difference (NETD), and thermal time constant] due to the high temperature coefficient of resistance (TCR) of these materials.
    Type: Grant
    Filed: August 11, 2021
    Date of Patent: June 13, 2023
    Assignee: Magnolia Optical Technologies, Inc.
    Inventors: Ashok K. Sood, John W. Zeller
  • Patent number: 11374187
    Abstract: Through selective incorporation of high carrier mobility graphene monolayers into low cost, NIR-sensitive SiGe detector layer structures, a device combining beneficial features from both technologies can be achieved. The SiGe in such hybrid SiGe/graphene detector devices serves as the NIR absorbing layer, or as the quantum dot material in certain device iterations. The bandgap of this SiGe layer where absorption of photons and photogeneration of carriers mainly takes place may be tuned by varying the concentrations of Ge in the SixGe1-x material. This bandgap and the thickness of this layer largely impact the degree and spectral characteristics of absorption properties, and thus the quantum efficiency or responsivity of the device. The main function and utility of the graphene monolayers, which are nearly transparent to incident light, is to facilitate the extraction and transport of electron and hole carriers from the SiGe absorbing layer through the device.
    Type: Grant
    Filed: April 22, 2020
    Date of Patent: June 28, 2022
    Assignee: Magnolia Optical Technologies, Inc.
    Inventors: John W. Zeller, Yash R. Puri, Ashok K. Sood
  • Patent number: 9219890
    Abstract: An image analysis system and method are provided. The system can include a base for receiving an optical surface, at least one light source positioned above and at an oblique angle with respect to the optical surface, a camera positioned above the optical surface and adapted to provide an image data indicative of an image of the optical surface, and a computerized system adapted to receive the image data from the camera. The computerized system can analyze the image data to identify and quantify surface defects. Classification identifiers can be assigned to each surface defect based on the physical characteristics of the surface defect. A transmission metric is calculated for the optical surface to allow objective judgment of the surface.
    Type: Grant
    Filed: August 22, 2012
    Date of Patent: December 22, 2015
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Tariq Manzur, John W. Zeller