Patents by Inventor Stephen S. Joseph

Stephen S. Joseph 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).

  • Abrasive tip/abradable shroud system and method for gas turbine compressor clearance control
    Patent number: 5704759
    Abstract: For use in a compressor unit of gas turbine engine, a blade having a tip portion. An abrasive portion is formed on the tip portion with the abrasive portion comprising a dispersion of discrete particles of cubic boron nitride disposed on the tip portion. A shroud is coated with a porous ceramic abradable material based on preferably 8% yttria-stabilized zirconia. The abrasive portion of the tip portion contacts the abradable material. In the preferred embodiment, the abradable material is treated with boron nitride composited polyester that is burned out of the material via thermal exposure to thereby improve porosity within the abradable material.
    Type: Grant
    Filed: October 21, 1996
    Date of Patent: January 6, 1998
    Assignee: AlliedSignal Inc.
    Inventors: Barry S. Draskovich, Norman E. Frani, Stephen S. Joseph, Dave Narasimhan