Patents by Inventor Alex J. Erstad

Alex J. Erstad 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).

  • Pseudo phase conjugate image transfer device
    Patent number: 10795161
    Abstract: Methods, apparatus, and systems for the design and use of image guides with a retro-reflector and beam splitter are disclosed. In one example, an apparatus includes: a first image guide situated to propagate a ray bundle so that a first portion exits the image guide output at a first portion angle and a second portion exits the output at a second portion angle opposite the first portion angle, a retro-reflector situated to reflect the respective ray bundle portions along their respective propagation paths incident onto the retro-reflector; a beam splitter situated to receive the reflected ray bundle portions from the retro-reflector, and a second image guide situated to receive the first and second ray bundle portions reflected from the beam splitter plane. In some examples, the retro-reflector is a micro retro-reflector array. In some examples, the retro-reflector is a pseudo-phase conjugate or phase conjugate mirror.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: October 6, 2020
    Assignee: The Arizona Board of Regents on behalf of the University of Arizona
    Inventors: Yuzuru Takashima, Alex J. Erstad
  • PSEUDO PHASE CONJUGATE IMAGE TRANSFER DEVICE
    Publication number: 20180196267
    Abstract: Methods, apparatus, and systems for the design and use of image guides with a retro-reflector and beam splitter are disclosed. In one example, an apparatus includes: a first image guide situated to propagate a ray bundle so that a first portion exits the image guide output at a first portion angle and a second portion exits the output at a second portion angle opposite the first portion angle, a retro-reflector situated to reflect the respective ray bundle portions along their respective propagation paths incident onto the retro-reflector; a beam splitter situated to receive the reflected ray bundle portions from the retro-reflector, and a second image guide situated to receive the first and second ray bundle portions reflected from the beam splitter plane. In some examples, the retro-reflector is a micro retro-reflector array. In some examples, the retro-reflector is a pseudo-phase conjugate or phase conjugate mirror.
    Type: Application
    Filed: July 8, 2016
    Publication date: July 12, 2018
    Applicant: The Arizona Board of Regents on Behalf of the Univ ersity of Arizona
    Inventors: Yuzuru Takashima, Alex J. Erstad