Patents by Inventor David R. Donaldson

David R. Donaldson 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).

  • Coreactive materials and methods for three-dimensional printing
    Patent number: 11920046
    Abstract: Methods of printing a three-dimensional object using co-reactive components are disclosed. Thermosetting compositions for three-dimensional printing are also disclosed.
    Type: Grant
    Filed: March 15, 2023
    Date of Patent: March 5, 2024
    Assignee: PPG Industries Ohio, Inc.
    Inventors: David R. Fenn, Kurt G. Olson, Reza M. Rock, Cynthia Kutchko, Susan F. Donaldson, Hao Sun
  • Compressor
    Patent number: 4780049
    Abstract: A compressor with a rotary driven centrifugal impeller which receives inlet air from an inlet passageway and this discharges compressed air through a radially extending diffuser passageway. Moveable vanes are provided both in the inlet passageway and diffuser passageway for varying the pressure and flow output from the compressor while maintaining the rotary speed of the centrifugal impeller substantially constant. In the preferred form of the invention, the centrifugal impeller and an electrical generator are rotatably driven at a constant speed and in synchronism with each other and, together, form an electrical and pneumatic power system.
    Type: Grant
    Filed: June 2, 1986
    Date of Patent: October 25, 1988
    Inventors: Lynn D. Palmer, David R. Donaldson, Donald L. Carriere, Christian J. Rahnke, Rogelio G. Samson, Antoni Paluszny