Patents by Inventor David S. Crawford

David S. Crawford 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).

  • Symmetric Cube Polarizing Beam Splitter
    Publication number: 20190250421
    Abstract: A cube polarizing beam splitter (PBS) can have one or more of the following characteristics: high contrast (Tp/Ts), acceptance of a large range of incident angles, broadband, and symmetry. The cube PBS can include a pair of wire-grid polarizers sandwiched between a first prism and a second prism. There can be a boundary layer between the wire-grid polarizers. An optical path length of a transmitted beam can be equal or very close to an optical path length of a reflected beam.
    Type: Application
    Filed: April 26, 2019
    Publication date: August 15, 2019
    Inventors: Shaun Ogden, Kerry Olivier, Hua Li, David S. Crawford, David Vern Nelson
  • Symmetric cube polarizing beam splitter
    Patent number: 10330946
    Abstract: A cube polarizing beam splitter (PBS) can have one or more of the following characteristics: high contrast (Tp/Ts), acceptance of a large range of incident angles, broadband, and symmetry. The cube PBS can include a pair of wire-grid polarizers sandwiched between a first prism and a second prism. There can be a boundary layer between the wire-grid polarizers. An optical path length of a transmitted beam can be equal or very close to an optical path length of a reflected beam.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: June 25, 2019
    Assignee: Moxtek, Inc.
    Inventors: Shaun Ogden, Kerry Olivier, Hua Li, David S. Crawford, David Vern Nelson
  • X-ray tube and receiver inside mouth
    Patent number: 9173623
    Abstract: A method and a device for low x-ray radiation dosage while taking x-ray images of a patient's teeth is disclosed. The method includes use of an x-ray source and receiver positioned at least partially inside the patient's mouth. The device includes an x-ray source and receiver attached together by a bite holder and configured to both be disposed at least partially inside the patient's mouth across a tooth while taking x-ray images of a patient's tooth.
    Type: Grant
    Filed: April 9, 2014
    Date of Patent: November 3, 2015
    Assignees: Moxtek, Inc.
    Inventors: Samuel Soonho Lee, Victor Armando Tirado, David S. Crawford
  • X-RAY TUBE AND RECEIVER INSIDE MOUTH
    Publication number: 20140341346
    Abstract: A method and a device for low x-ray radiation dosage while taking x-ray images of a patient's teeth is disclosed. The method includes use of an x-ray source and receiver positioned at least partially inside the patient's mouth. The device includes an x-ray source and receiver attached together by a bite holder and configured to both be disposed at least partially inside the patient's mouth across a tooth while taking x-ray images of a patient's tooth.
    Type: Application
    Filed: April 9, 2014
    Publication date: November 20, 2014
    Applicant: Moxtek, Inc.
    Inventors: Samuel Soonho Lee, Victor Armando Tirado, David S. Crawford