Patents by Inventor Felix Jan Grawert

Felix Jan Grawert 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).

  • Optical device comprising crystalline semiconductor layer and reflective element
    Patent number: 7812423
    Abstract: An optical semiconductor includes a first semiconductor layer and at least one reflective element that is formed on the semiconductor layer. The at least one reflective element comprises alternating layers of high and low index layers. A crystalline semiconductor layer is formed on the at least one reflective element.
    Type: Grant
    Filed: August 12, 2004
    Date of Patent: October 12, 2010
    Assignee: Massachusetts Institute of Technology
    Inventors: Felix Jan Grawert, Shoji Akiyama, Kazumi Wada, Franz X. Kaertner
  • Process for fabrication of high reflectors by reversal of layer sequence and application thereof
    Patent number: 7190524
    Abstract: An optical reflector includes an optical reflective element that comprises alternating layers of high and low index layers. A new substrate is bonded on the optical reflective element. The sequence of layers in the reflective element is reversed in order such that the layers grown first with lowest surface roughness are exposed to the highest electric field strength, and the layer grown last, of highest roughness, are buried deep in the multilayer stack.
    Type: Grant
    Filed: August 12, 2004
    Date of Patent: March 13, 2007
    Assignee: Massachusetts Institute of Technology
    Inventors: Felix Jan Grawert, Shoji Akiyama, Kazumi Wada, Franz X. Kaertner