Patents by Inventor P. Daniel Dapkus

P. Daniel Dapkus 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).

  • Light emitting device comprising phosphorescent materials for white light generation
    Patent number: 8786179
    Abstract: The present invention relates to phosphors for energy downconversion of high energy light to generate a broadband light spectrum, which emit light of different emission wavelengths.
    Type: Grant
    Filed: September 17, 2012
    Date of Patent: July 22, 2014
    Assignee: Universal Display Corporation
    Inventors: Mark E. Thompson, P. Daniel Dapkus
  • LIGHT EMITTING DEVICE COMPRISING PHOSPHORESCENT MATERIALS FOR WHITE LIGHT GENERATION
    Publication number: 20140077689
    Abstract: The present invention relates to phosphors for energy downconversion of high energy light to generate a broadband light spectrum, which emit light of different emission wavelengths.
    Type: Application
    Filed: September 17, 2012
    Publication date: March 20, 2014
    Applicant: UNIVERSAL DISPLAY CORPORATION
    Inventors: MARK E. THOMPSON, P. DANIEL DAPKUS
  • Segmented-mirror VCSEL
    Patent number: 6594294
    Abstract: A segmented-mirror vertical cavity surface emitting laser includes an active portion with an active region having at least one quantum well and a lateral dimension. A first mirror stack is positioned on a first opposed major surface of the active portion and extends laterally beyond the lateral dimension of the active region. A second mirror stack is positioned on the opposed major surface and extends laterally beyond the lateral dimension of the active region. The second mirror stack is segmented into two or more zones. In the case where there are two zones, in the first zone there would be a first reflectivity and a first thermal impedance, and in the second zone there would be a second reflectivity lower than the first reflectivity and a second thermal impedance lower than the first thermal impedance.
    Type: Grant
    Filed: March 7, 2001
    Date of Patent: July 15, 2003
    Inventors: Jeff Tsao, Chan-Long Shieh, P. Daniel Dapkus, Jay Yang