Patents by Inventor Stephen T. Narsavage

Stephen T. Narsavage 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).

  • Method for producing an abradable seal
    Patent number: 5780116
    Abstract: A gas turbine abradable seal is prepared by plasma spraying an oxidation resistant metallic material and boron nitride. The resultant structure comprises a metallic matrix encompassing a lubricating amount of boron nitride, with porosity of less than about 15 percent and a fabricated surface roughness of less than about 600 microinches. The reduced surface roughness and substantially reduced permeability of this seal provide substantially enhanced engine efficiency, and improved durability.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: July 14, 1998
    Assignee: United Technologies Corporation
    Inventors: Gerard A. Sileo, John W. Appleby, Stephen T. Narsavage, Francis X. Alent, Charles G. Davis
  • Plasma sprayed abradable seals for gas turbine engines
    Patent number: 5536022
    Abstract: A gas turbine abradable seal is prepared by plasma spraying an oxidation resistant metallic material and boron nitride. The resultant structure comprises a metallic matrix encompassing a lubricating amount of boron nitride, with porosity of less than about 15 percent and a fabricated surface roughness of less than about 600 microinches. The reduced surface roughness and substantially reduced permeability of this seal provide substantially enhanced engine efficiency, and improved durability.
    Type: Grant
    Filed: October 29, 1993
    Date of Patent: July 16, 1996
    Assignee: United Technologies Corporation
    Inventors: Gerard A. Sileo, John W. Appleby, Stephen T. Narsavage, Francis X. Alent, Charles G. Davis
  • High pressure-low porosity wet seal
    Patent number: 4259389
    Abstract: A high pressure, low porosity wet seal for a substrate in a fuel cell in which the seal is made up of a granular material having a particle size varying from 10 to 0.1 microns in size bonded together with polytetrafluoroethylene to prevent leakage of the gaseous fuel or oxidant from the cell.
    Type: Grant
    Filed: December 22, 1978
    Date of Patent: March 31, 1981
    Assignee: United Technologies Corporation
    Inventors: Raymond W. Vine, Stephen T. Narsavage