Patents by Inventor J. Kevin Erwin

J. Kevin Erwin 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).

  • Small-beam lateral-shear interferometer
    Patent number: 6937347
    Abstract: A lateral-shear interferometer utilizes two relatively thick glass plates bonded together in a single block with a tilted air gap between opposing inner surfaces. The thickness of the glass plates is selected to be sufficiently large to separate the output beams from the light reflected from the top and bottom surfaces of the block, thereby eliminating the need for antireflection coatings. The shear interferometer is combined with an external mirror mounted on a tilt stage actuated by a computer-controlled tilt actuator to perform phase-shifting interferometric analysis in conventional manner.
    Type: Grant
    Filed: September 18, 2002
    Date of Patent: August 30, 2005
    Assignee: Engineering Synthesis Design Inc.
    Inventor: J. Kevin Erwin
  • Small-beam lateral-shear interferometer
    Publication number: 20040051877
    Abstract: A lateral-shear interferometer utilizes two relatively thick glass plates bonded together in a single block with a tilted air gap between opposing inner surfaces. The thickness of the glass plates is selected to be sufficiently large to separate the output beams from the light reflected from the top and bottom surfaces of the block, thereby eliminating the need for antireflection coatings. The shear interferometer is combined with an external mirror mounted on a tilt stage actuated by a computer-controlled tilt actuator to perform phase-shifting interferometric analysis in conventional manner.
    Type: Application
    Filed: September 18, 2002
    Publication date: March 18, 2004
    Inventor: J. Kevin Erwin