Patents by Inventor Daniel C. Friedberg

Daniel C. Friedberg 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).

  • Brittle composite structure for resiliently accomodating thermal expansion
    Patent number: 6102610
    Abstract: Two composite parts, such as sheet and a hollow gas turbine liner tile, are fastened together using a fastening system that includes a journal bearing that fits in a bore in the sheet and springs to support a bolt fastener that is tightened to hold the parts together. Resilient spacers are placed between the sheet and the liner. The springs may comprise a stack of rings, each ring being a tightly wound helical spring, giving the ring a hollow cross section and resilient qualities.
    Type: Grant
    Filed: October 7, 1996
    Date of Patent: August 15, 2000
    Assignee: United Technologies Corporation
    Inventors: Mark E. Palusis, Carlos G. Figueroa, Daniel C. Friedberg, Gary D. Jones, Gunther Eichhorn
  • Forced air cooled gas turbine exhaust liner
    Patent number: 5755093
    Abstract: The exhaust in a gas turbine engine is lined with stacks of hollow cooling blocks made of a composite material. Air is pumped into each stack and escapes into the exhaust flow from a slot between the blocks in each stack. In addition, the blocks contain passages so that some of the airflow escapes to a space between the stacks. The blocks are attached using special fasteners that does not create mechanical stresses on the composite material.
    Type: Grant
    Filed: May 1, 1995
    Date of Patent: May 26, 1998
    Assignee: United Technologies Corporation
    Inventors: Mark E. Palusis, Carlos G. Figueroa, Daniel C. Friedberg, Debora F. Kehret
  • Attaching brittle composite structures in gas turbine engines for resiliently accommodating thermal expansion
    Patent number: 5592814
    Abstract: Two composite parts, such as sheet and a hollow gas turbine liner tile, are fastened together using a fastening system that includes a journal bearing that fits in a bore in the sheet and springs to support a bolt fastener that is tightened to hold the parts together. Resilient spacers are placed between the sheet and the liner. The springs may comprise a stack of rings, each ring being a tightly wound helical spring, giving the ring a hollow cross section and resilient qualities.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: January 14, 1997
    Assignee: United Technologies Corporation
    Inventors: Mark E. Palusis, Carlos G. Figueroa, Daniel C. Friedberg, Gary D. Jones, Gunther Eichhorn