Patents by Inventor Pantcho P. Stoyanov

Pantcho P. Stoyanov 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).

  • Self-lubricating blade root/disk interface
    Patent number: 11952916
    Abstract: A coating for a blade root/disk interface includes a layer of soft metal matrix, and a solid lubricant distributed through the soft metal matrix. Examples of materials include CuAl as the soft metal matrix and MoS2 as the solid lubricant, although others are also disclosed.
    Type: Grant
    Filed: August 14, 2020
    Date of Patent: April 9, 2024
    Assignee: RTX Corporation
    Inventors: Pantcho P. Stoyanov, Kelly M. Harrington, Thomas D. Kasprow
  • Seal seat insert for gas turbine engines
    Patent number: 11859497
    Abstract: A seal assembly for a gas turbine engine may include a seal body coupled to an engine static structure of the gas turbine engine and a seal seat insert coupled to a radially extending portion of a shaft of the gas turbine engine. The seal body may be generally configured to be biased into contact with the seal seat insert to provide a sealing pressure between the seal body and the seal seat insert. In various embodiments, the seal seat insert is made from a ceramic material or a ceramic matrix composite.
    Type: Grant
    Filed: March 28, 2022
    Date of Patent: January 2, 2024
    Assignee: RTX Corporation
    Inventors: Pantcho P. Stoyanov, Eli N. Ross
  • CARBON SEAL ASSEMBLY
    Publication number: 20230323782
    Abstract: A seal assembly includes a carbon seal that has a sealing surface. A seal seat has a sealing surface and is positioned for rotation relative to the carbon seal. A diamond-like carbon coating at least partially forms the sealing surface on the seal seat.
    Type: Application
    Filed: June 15, 2023
    Publication date: October 12, 2023
    Inventors: Pantcho P. Stoyanov, Jonathan F. Zimmitti, Nasr A. Shuaib
  • CARBON SEAL ASSEMBLY
    Publication number: 20230323951
    Abstract: A seal assembly includes a housing that includes a seal flange at least partially defining a seal opening. A carbon seal is located at least partially in the seal opening and includes a first axially facing surface. The seal flange includes an axially facing surface that has a carbide based coating and a diamond-like carbon coating in engagement with the first axially facing surface on the carbon seal.
    Type: Application
    Filed: June 6, 2023
    Publication date: October 12, 2023
    Inventors: Pantcho P. Stoyanov, Jonathan F. Zimmitti, Nasr A. Shuaib
  • Bushing for variable vane in a gas turbine engine
    Patent number: 11746665
    Abstract: A method of operating a variable vane for a gas turbine includes the step of locating a first bushing at least partially surrounding a first trunnion that extends from a first end of the variable vane. The first trunnion includes an outer surface that has a plurality of troughs. The first bushing includes a plurality of peaks that extend inward from an inner surface. Relative movement is produced between the first bushing and the first trunnion to form a carbon transfer film between the first bushing and the first trunnion.
    Type: Grant
    Filed: May 27, 2022
    Date of Patent: September 5, 2023
    Assignee: RTX Corporation
    Inventors: Pantcho P. Stoyanov, Mary E. Makowiec
  • Carbon seal assembly
    Patent number: 11746907
    Abstract: A seal assembly includes a housing that includes a seal flange at least partially defining a seal opening. A carbon seal is located at least partially in the seal opening and includes a first axially facing surface. The seal flange includes an axially facing surface that has a carbide based coating and a diamond-like carbon coating in engagement with the first axially facing surface on the carbon seal.
    Type: Grant
    Filed: February 14, 2020
    Date of Patent: September 5, 2023
    Assignee: RTX Corporation
    Inventors: Pantcho P. Stoyanov, Jonathan F. Zimmitti, Nasr A. Shuaib
  • High pressure compressor seal-ring with improved wear resistance
    Patent number: 11739842
    Abstract: A compressor seal-ring assembly includes a seal formed of a nickel, cobalt or iron-based superalloy; a counterface positioned for sealing interaction with the seal; and a lubricant coating on the seal, the lubricant coating being formed of a CoCrAlY-containing material.
    Type: Grant
    Filed: July 2, 2021
    Date of Patent: August 29, 2023
    Assignee: Raytheon Technologies Corporation
    Inventors: Pantcho P. Stoyanov, Kelly M. Harrington
  • Low friction carbon—carbon seal assembly
    Patent number: 11719114
    Abstract: A seal assembly for a gas turbine engine, having a seal formed of a carbon material; and a seal seat positioned for rotation relative to the seal, wherein the seal and the seal seat each have a sealing surface which together define a sliding seal, and wherein at least the sealing surface of the seal seat is made of the same carbon material as the sealing surface of the seal.
    Type: Grant
    Filed: September 18, 2019
    Date of Patent: August 8, 2023
    Assignee: RAYTHEON TECHNOLOGIES CORPORATION
    Inventor: Pantcho P. Stoyanov
  • Carbon seal assembly
    Patent number: 11692449
    Abstract: A seal assembly includes a carbon seal that has a sealing surface. A seal seat has a sealing surface and is positioned for rotation relative to the carbon seal. A diamond-like carbon coating at least partially forms the sealing surface on the seal seat.
    Type: Grant
    Filed: February 14, 2020
    Date of Patent: July 4, 2023
    Assignee: Raytheon Technologies Corporation
    Inventors: Pantcho P. Stoyanov, Jonathan F. Zimmitti, Nasr A. Shuaib
  • SEALS AND METHODS OF MAKING SEALS
    Publication number: 20230184124
    Abstract: A method includes providing a powdered high entropy alloy and forming the powdered high entropy alloy into a seal body with a heat source. The seal body extends between a leading edge and a trailing edge and includes a first component contact surface adjacent the leading edge and a second component contact surface adjacent the trailing edge. The seal body is operable at temperatures in excess of 700° C.
    Type: Application
    Filed: February 10, 2023
    Publication date: June 15, 2023
    Inventors: Pantcho P. Stoyanov, Eli N. Ross
  • Seals and methods of making seals
    Patent number: 11643939
    Abstract: A tribological and creep resistant system configured to operate at temperatures in excess of 700° C. A seal body extends between a leading edge and a trailing edge. A first component contact surface is adjacent the leading edge and a second component contact surface is adjacent the trailing edge. The seal body is formed from a high entropy alloy.
    Type: Grant
    Filed: September 2, 2020
    Date of Patent: May 9, 2023
    Assignee: RAYTHEON TECHNOLOGIES CORPORATION
    Inventors: Pantcho P. Stoyanov, Eli N. Ross
  • Carbon seal assembly
    Patent number: 11619237
    Abstract: A seal assembly includes a housing at least partially defining a seal opening and at least partially surrounding a rotatable shaft. A carbon seal is located at least partially in the seal opening and includes a sealing surface. The rotatable shaft includes a radially facing surface that has a carbide based coating and a diamond-like carbon coating in engagement with the sealing surface on the carbon seal.
    Type: Grant
    Filed: February 14, 2020
    Date of Patent: April 4, 2023
    Assignee: Raytheon Technologies Corporation
    Inventors: Pantcho P. Stoyanov, Jonathan F. Zimmitti, Nasr A. Shuaib
  • Low friction, wear resistant variable vane bushing
    Patent number: 11566535
    Abstract: A variable vane assembly includes a variable vane; a trunnion arranged on one end of the variable vane; a bushing mated to the trunnion to define an interface between the trunnion and the bushing; and a surface modification on at least one of the trunnion and the bushing at the interface, whereby frictional heating at the interface during operation of the assembly is reduced.
    Type: Grant
    Filed: May 21, 2020
    Date of Patent: January 31, 2023
    Assignee: Raytheon Technologies Corporation
    Inventors: Pantcho P. Stoyanov, Michael D. Greenberg
  • Seal assembly for gas turbine engine
    Patent number: 11560808
    Abstract: A seal assembly for a gas turbine engine having a seal formed of a carbon material; and a seal seat positioned for rotation relative to the seal, wherein the seal and the seal seat each have a sealing surface which together define a sliding seal, and further having a carbon film on the sealing surface of the seal seat.
    Type: Grant
    Filed: September 18, 2019
    Date of Patent: January 24, 2023
    Assignee: Raytheon Technologies Corporation
    Inventor: Pantcho P. Stoyanov
  • SEAL SEAT INSERT FOR GAS TURBINE ENGINES
    Publication number: 20220412223
    Abstract: A seal assembly for a gas turbine engine may include a seal body coupled to an engine static structure of the gas turbine engine and a seal seat insert coupled to a radially extending portion of a shaft of the gas turbine engine. The seal body may be generally configured to be biased into contact with the seal seat insert to provide a sealing pressure between the seal body and the seal seat insert. In various embodiments, the seal seat insert is made from a ceramic material or a ceramic matrix composite.
    Type: Application
    Filed: March 28, 2022
    Publication date: December 29, 2022
    Applicant: RAYTHEON TECHNOLOGIES CORPORATION
    Inventors: Pantcho P. Stoyanov, Eli N. Ross
  • LOW FRICTION, WEAR RESISTANT PISTON SEAL
    Publication number: 20220325797
    Abstract: A piston seal assembly for a gas turbine engine includes a seal composed of a nickel-based superalloy; a component in contact with the seal and defining a seal-counterface; and a coating on the seal at the seal-counterface, wherein the coating is a metal alloy binder phase and a hard particle phase distributed through the binder phase.
    Type: Application
    Filed: February 21, 2022
    Publication date: October 13, 2022
    Applicant: Raytheon Technologies Corporation
    Inventors: Pantcho P. Stoyanov, Kelly M. Harrington
  • Wear resistant, self-lubricating static seal
    Patent number: 11448082
    Abstract: A seal assembly for a gas turbine engine includes a seal composed of a nickel-based superalloy; a component in contact with the seal and defining a seal-counterface; and a coating on the seal at the seal-counterface, wherein the coating is a ternary oxide.
    Type: Grant
    Filed: July 1, 2020
    Date of Patent: September 20, 2022
    Assignee: Raytheon Technologies Corporation
    Inventors: Pantcho P. Stoyanov, Kelly M. Harrington
  • BUSHING FOR VARIABLE VANE IN A GAS TURBINE ENGINE
    Publication number: 20220282629
    Abstract: A method of operating a variable vane for a gas turbine engine includes the step of locating a first bushing adjacent a first trunnion on a variable vane. At least one of the first bushing or the first trunnion include a first plurality of surface irregularities. Relative movement is produced between the first bushing and the first trunnion to form a carbon transfer film between the first bushing and the first trunnion.
    Type: Application
    Filed: May 27, 2022
    Publication date: September 8, 2022
    Inventors: Pantcho P. Stoyanov, Mary E. Makowiec
  • Bushing for variable vane in a gas turbine engine
    Patent number: 11346235
    Abstract: A component for a gas turbine engine includes an airfoil. A first trunnion has an outer surface and extends from a first end of the airfoil. A first bushing at least partially surrounds the outer surface. At least one of the first bushing or the first trunnion includes a plurality of surface irregularities.
    Type: Grant
    Filed: June 4, 2019
    Date of Patent: May 31, 2022
    Assignee: RAYTHEON TECHNOLOGIES CORPORATION
    Inventors: Pantcho P. Stoyanov, Mary E. Makowiec
  • Seal seat insert for gas turbine engines
    Patent number: 11339675
    Abstract: A seal assembly for a gas turbine engine may include a seal body coupled to an engine static structure of the gas turbine engine and a seal seat insert coupled to a radially extending portion of a shaft of the gas turbine engine. The seal body may be generally configured to be biased into contact with the seal seat insert to provide a sealing pressure between the seal body and the seal seat insert. In various embodiments, the seal seat insert is made from a ceramic material or a ceramic matrix composite.
    Type: Grant
    Filed: September 13, 2019
    Date of Patent: May 24, 2022
    Assignee: Raytheon Technologies Corporation
    Inventors: Pantcho P. Stoyanov, Eli N. Ross