having cooling arrangements

Industry

CPC
F02K9/64

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Parent Industries

FMECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING ENGINES OR PUMPS F02Combustion engines F02KJET-PROPULSION PLANTS F02K9/00Rocket- engine plants

Current Industry

F02K9/64having cooling arrangements

Industries

Patents Grantslast 30 patents

Information Patent Grant
Single stage to orbit rocket engine
- Patent number 12,173,671
- Issue date Dec 24, 2024
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Transpiration-cooled systems having permeable and non-permeable por...
- Patent number 12,140,109
- Issue date Nov 12, 2024
- Blue Origin, LLC
- Weidong Song
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Rocket motor and components thereof
- Patent number 12,116,958
- Issue date Oct 15, 2024
- Dawn Aerospace Limited
- Stefan Johannes Powell
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Combustor for rocket engine and method for manufacturing it
- Patent number 12,098,691
- Issue date Sep 24, 2024
- Interstellar Technologies Inc.
- Hiroshi Tamemasa
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Upper stage rocket including aerospike nozzle defining actively-coo...
- Patent number 12,085,044
- Issue date Sep 10, 2024
- Andrew Lapsa
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Scaleable acoustically-stable combustion chamber and design methods
- Patent number 12,086,517
- Issue date Sep 10, 2024
- GLOYER-TAYLOR LABORATORIES LLC
- Paul Gloyer
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Rocket engine systems with a supercritical coolant
- Patent number 12,071,914
- Issue date Aug 27, 2024
- Venus Aerospace Corp.
- Andrew Thomas Duggleby
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Augmented aerospike nozzle, engine including the augmented aerospik...
- Patent number 12,031,507
- Issue date Jul 9, 2024
- Andrew Lapsa
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Omnivorous solar thermal thruster, cooling systems, and thermal ene...
- Patent number 12,025,078
- Issue date Jul 2, 2024
- Trans Astronautica Corporation
- Joel C. Sercel
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Combustor including heat exchange structure and rocket comprising same
- Patent number 12,025,077
- Issue date Jul 2, 2024
- Korea Aerospace Research Institute
- Keum-Oh Lee
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Rocket engine section having a porous inner wall portion and method...
- Patent number 11,988,171
- Issue date May 21, 2024
- ARIANEGROUP GMBH
- Dietmar Wiedmann
- B33 - ADDITIVE MANUFACTURING TECHNOLOGY
Information Patent Grant
Thrust chamber integrated with igniter of rocket engine using cryog...
- Patent number 11,988,174
- Issue date May 21, 2024
- Korea Aerospace Research Institute
- Byoung Jik Lim
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Tripropellant rotating detonation rocket engine systems
- Patent number 11,982,250
- Issue date May 14, 2024
- Venus Aerospace Corp.
- Andrew Thomas Duggleby
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Dual mode rocket engine with bipropellant injection in the nozzle
- Patent number 11,976,613
- Issue date May 7, 2024
- Pivotal Space, Inc.
- Lloyd J. Droppers
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Afterburning turbine exhaust cycle (ABTEC)
- Patent number 11,976,614
- Issue date May 7, 2024
- Pivotal Space, Inc.
- Lloyd J. Droppers
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Nuclear thermal propulsion system with reactor direct drive of cryo...
- Patent number 11,975,870
- Issue date May 7, 2024
- Blue Origin, LLC
- Zachary Reid Tolley
- G21 - NUCLEAR PHYSICS NUCLEAR ENGINEERING
Information Patent Grant
Staged combustion liquid rocket engine cycle with the turbopump uni...
- Patent number 11,970,996
- Issue date Apr 30, 2024
- Special Aerospace Services, LLC
- Timothy Bulk
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Multi-part fluid chamber and method of manufacturing
- Patent number 11,939,935
- Issue date Mar 26, 2024
- ABL Space Systems
- Harrison O'Hanley
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Reusable upper stage rocket with aerospike engine
- Patent number 11,933,249
- Issue date Mar 19, 2024
- Blue Origin, LLC
- James R. French
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Jet nozzle equipped with a thermally regulated ring
- Patent number 11,852,105
- Issue date Dec 26, 2023
- ARIANEGROUP SAS
- Xavier Zorrilla
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Reactor rocket engine
- Patent number 11,846,273
- Issue date Dec 19, 2023
- Venus Aerospace Corp.
- Andrew Thomas Duggleby
- G21 - NUCLEAR PHYSICS NUCLEAR ENGINEERING
Information Patent Grant
Liquid rocket engine booster engine with combustion gas fuel source
- Patent number 11,846,251
- Issue date Dec 19, 2023
- Firefly Aerospace Inc.
- Anatoli Alimpievich Borissov
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Integrated propulsion system for hybrid rockets
- Patent number 11,846,254
- Issue date Dec 19, 2023
- AT SPACE PTY LTD
- Yen-Sen Chen
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Combustion chamber section with integral baffle and method of makin...
- Patent number 11,846,255
- Issue date Dec 19, 2023
- ARIANEGROUP GMBH
- Chris Udo Maeding
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Film cooling with rotating detonation engine to secondary combustion
- Patent number 11,840,988
- Issue date Dec 12, 2023
- Venus Aerospace Corp.
- Aaron Ezekiel Smith
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Swirl preburner system and method
- Patent number 11,815,049
- Issue date Nov 14, 2023
- Stratolaunch, LLC
- Jeffery Tyler Thornburg
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Detonation rocket engine comprising an aerospike nozzle and centrin...
- Patent number 11,795,891
- Issue date Oct 24, 2023
- SIEC BADAWCZA LUKASIEWICZ-INSTYTUT LOTNICTWA
- Piotr Wolański
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Heater apparatus and method for heating a component of a spacecraft...
- Patent number 11,753,189
- Issue date Sep 12, 2023
- ARIANEGROUP GMBH
- Erich Werth
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Liquid rocket engine cooling channels
- Patent number 11,746,729
- Issue date Sep 5, 2023
- Firefly Aerospace Inc.
- Anatoli Alimpievich Borissov
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Combustion chamber with vibration damping inner wall shape and meth...
- Patent number 11,719,194
- Issue date Aug 8, 2023
- ARIANEGROUP GMBH
- Chris Udo Maeding
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS

Patents Applicationslast 30 patents

Information Patent Application
SCALEABLE ACOUSTICALLY-STABLE COMBUSTION CHAMBER AND DESIGN METHODS
- Publication number 20240411966
- Publication date Dec 12, 2024
- GTL Company
- Paul Gloyer
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Application
REUSABLE UPPER STAGE ROCKET
- Publication number 20240401548
- Publication date Dec 5, 2024
- STOKE Space Technologies, Inc.
- Andrew Lapsa
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
SINGLE STAGE TO ORBIT ROCKET ENGINE
- Publication number 20240369028
- Publication date Nov 7, 2024
- Atharva Undire
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
TRANSPIRATION-COOLED SYSTEMS HAVING PERMEABLE AND NON-PERMEABLE POR...
- Publication number 20240328373
- Publication date Oct 3, 2024
- Blue Origin, LLC
- Weidong Song
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
FILM COOLING WITH ROTATING DETONATION ENGINE TO SECONDARY COMBUSTION
- Publication number 20240295199
- Publication date Sep 5, 2024
- Venus Aerospace Corp.
- Aaron Ezekiel SMITH
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
NUCLEAR THERMAL PROPULSION SYSTEM WITH REACTOR DIRECT DRIVE OF CRYO...
- Publication number 20240278938
- Publication date Aug 22, 2024
- Blue Origin, LLC
- Zachary Reid Tolley
- G21 - NUCLEAR PHYSICS NUCLEAR ENGINEERING
Information Patent Application
PROPULSION SYSTEM FOR A VEHICLE USING HEAT ENERGY ABSORBED IN AN AC...
- Publication number 20240229746
- Publication date Jul 11, 2024
- Mikhail KOKORICH
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
ROCKET INJECTOR SUBSCALE STABILITY ASSESSMENT WITH TELESCOPING THRO...
- Publication number 20240218846
- Publication date Jul 4, 2024
- Blue Origin, LLC
- Owen Graham
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
PLASMA-FACING COMPONENT COOLING
- Publication number 20240127972
- Publication date Apr 18, 2024
- Tokamak Energy Ltd.
- Rob Bamber
- G21 - NUCLEAR PHYSICS NUCLEAR ENGINEERING
Information Patent Application
AEROSPIKE ENGINES, LAUNCH VEHICLES INCORPORATING SUCH ENGINES AND M...
- Publication number 20240067362
- Publication date Feb 29, 2024
- PANGEA AEROSPACE, S.L.
- Federico ROSSI
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
NUCLEAR THERMAL PROPULSION SYSTEM WITH REACTOR DIRECT DRIVE OF CRYO...
- Publication number 20230415926
- Publication date Dec 28, 2023
- Blue Origin, LLC
- Zachary Reid Tolley
- G21 - NUCLEAR PHYSICS NUCLEAR ENGINEERING
Information Patent Application
DESIGN AND MANUFACTURING OF A SINGLE PIECE ROCKET ENGINE
- Publication number 20230407821
- Publication date Dec 21, 2023
- AGNIKUL COSMOS PRIVATE LIMITED
- Syed Peer Mohamed SHAH KHADRI
- B22 - CASTING POWDER METALLURGY
Information Patent Application
STAGED COMBUSTION LIQUID ROCKET ENGINE CYCLE WITH THE TURBOPUMP UNI...
- Publication number 20230332562
- Publication date Oct 19, 2023
- Special Aerospace Services, LLC
- Timothy Bulk
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
FEED SYSTEM FOR ROCKET ENGINE
- Publication number 20230313758
- Publication date Oct 5, 2023
- ATLANTIS RESEARCH LABS INC.
- Troy Leonard Messinger
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
THRUST CHAMBER DEVICE AND METHOD FOR OPERATING A THRUST CHAMBER DEVICE
- Publication number 20230279827
- Publication date Sep 7, 2023
- Deutsches Zentrum fuer Luft-und Raumfahrt e.V.
- Markus Ortelt
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
Rocket Engine Systems with a Supercritical Coolant
- Publication number 20230220817
- Publication date Jul 13, 2023
- Andrew Thomas Duggleby
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
MULTI-PART FLUID CHAMBER AND METHOD OF MANUFACTURING
- Publication number 20230184196
- Publication date Jun 15, 2023
- ABL Space Systems
- Harrison O'Hanley
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Application
OMNIVOROUS SOLAR THERMAL THRUSTER, COOLING SYSTEMS, AND THERMAL ENE...
- Publication number 20230130545
- Publication date Apr 27, 2023
- Trans Astronautica Corporation
- Joel C. Sercel
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
COMBUSTOR FOR ROCKET ENGINE AND METHOD FOR MANUFACTURING IT
- Publication number 20230125860
- Publication date Apr 27, 2023
- Interstellar Technologies Inc.
- Hiroshi TAMEMASA
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
ROCKET ENGINE SECTION HAVING A POROUS INNER WALL PORTION AND METHOD...
- Publication number 20230044769
- Publication date Feb 9, 2023
- ArianeGroup GmbH
- Dietmar Wiedmann
- B33 - ADDITIVE MANUFACTURING TECHNOLOGY
Information Patent Application
COMBUSTOR OF LIQUID ROCKET ENGINE
- Publication number 20230003178
- Publication date Jan 5, 2023
- KOREA AEROSPACE RESEARCH INSTITUTE
- Keum Oh LEE
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
HYBRID SOLAR THERMAL AND CHEMICAL VEHICLE CONFIGURATIONS FOR SPACE...
- Publication number 20220290635
- Publication date Sep 15, 2022
- Trans Astronautica Corporation
- Joel C. Sercel
- E21 - EARTH DRILLING MINING
Information Patent Application
LIQUID ROCKET ENGINE TAP-OFF POWER SOURCE
- Publication number 20220268239
- Publication date Aug 25, 2022
- FireFly Aerospace Inc.
- Thomas Edward Markusic
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
JET NOZZLE EQUIPPED WITH A THERMALLY REGULATED RING
- Publication number 20220220926
- Publication date Jul 14, 2022
- ARIANEGROUP SAS
- Xavier ZORRILLA
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
STAGED COMBUSTION LIQUID ROCKET ENGINE CYCLE WITH THE TURBOPUMP UNI...
- Publication number 20220205411
- Publication date Jun 30, 2022
- Special Aerospace Services, LLC
- Timothy Bulk
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
Tripropellant Rotating Detonation Rocket Engine Systems
- Publication number 20220205412
- Publication date Jun 30, 2022
- Venus Aerospace Corp.
- Andrew Thomas Duggleby
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
LIQUID-COOLED AIR-BREATHING ROCKET ENGINE
- Publication number 20220145831
- Publication date May 12, 2022
- Mountain Aerospace Research Solutions, Inc.
- Aaron Davis
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
THRUST CHAMBER INTEGRATED WITH IGNITER OF ROCKET ENGINE USING CRYOG...
- Publication number 20220120242
- Publication date Apr 21, 2022
- KOREA AEROSPACE RESEARCH INSTITUTE
- Byoung Jik LIM
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
COMBUSTION CHAMBER SECTION WITH INTEGRAL BAFFLE AND METHOD OF MAKIN...
- Publication number 20220090562
- Publication date Mar 24, 2022
- ArianeGroup GmbH
- Chris Udo Maeding
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
COMBUSTION CHAMBER WITH VIBRATION DAMPING INNER WALL SHAPE AND METH...
- Publication number 20220090563
- Publication date Mar 24, 2022
- ArianeGroup GmbH
- Chris Udo Maeding
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS

having cooling arrangements

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Single stage to orbit rocket engine

Transpiration-cooled systems having permeable and non-permeable por...

Rocket motor and components thereof

Combustor for rocket engine and method for manufacturing it

Upper stage rocket including aerospike nozzle defining actively-coo...

Scaleable acoustically-stable combustion chamber and design methods

Rocket engine systems with a supercritical coolant

Augmented aerospike nozzle, engine including the augmented aerospik...

Omnivorous solar thermal thruster, cooling systems, and thermal ene...

Combustor including heat exchange structure and rocket comprising same

Rocket engine section having a porous inner wall portion and method...

Thrust chamber integrated with igniter of rocket engine using cryog...

Tripropellant rotating detonation rocket engine systems

Dual mode rocket engine with bipropellant injection in the nozzle

Afterburning turbine exhaust cycle (ABTEC)

Nuclear thermal propulsion system with reactor direct drive of cryo...

Staged combustion liquid rocket engine cycle with the turbopump uni...

Multi-part fluid chamber and method of manufacturing

Reusable upper stage rocket with aerospike engine

Jet nozzle equipped with a thermally regulated ring

Reactor rocket engine

Liquid rocket engine booster engine with combustion gas fuel source

Integrated propulsion system for hybrid rockets

Combustion chamber section with integral baffle and method of makin...

Film cooling with rotating detonation engine to secondary combustion

Swirl preburner system and method

Detonation rocket engine comprising an aerospike nozzle and centrin...

Heater apparatus and method for heating a component of a spacecraft...

Liquid rocket engine cooling channels

Combustion chamber with vibration damping inner wall shape and meth...

Patents Applicationslast 30 patents

SCALEABLE ACOUSTICALLY-STABLE COMBUSTION CHAMBER AND DESIGN METHODS

REUSABLE UPPER STAGE ROCKET

SINGLE STAGE TO ORBIT ROCKET ENGINE

TRANSPIRATION-COOLED SYSTEMS HAVING PERMEABLE AND NON-PERMEABLE POR...

FILM COOLING WITH ROTATING DETONATION ENGINE TO SECONDARY COMBUSTION

NUCLEAR THERMAL PROPULSION SYSTEM WITH REACTOR DIRECT DRIVE OF CRYO...

PROPULSION SYSTEM FOR A VEHICLE USING HEAT ENERGY ABSORBED IN AN AC...

ROCKET INJECTOR SUBSCALE STABILITY ASSESSMENT WITH TELESCOPING THRO...

PLASMA-FACING COMPONENT COOLING

AEROSPIKE ENGINES, LAUNCH VEHICLES INCORPORATING SUCH ENGINES AND M...

NUCLEAR THERMAL PROPULSION SYSTEM WITH REACTOR DIRECT DRIVE OF CRYO...

DESIGN AND MANUFACTURING OF A SINGLE PIECE ROCKET ENGINE

STAGED COMBUSTION LIQUID ROCKET ENGINE CYCLE WITH THE TURBOPUMP UNI...

FEED SYSTEM FOR ROCKET ENGINE

THRUST CHAMBER DEVICE AND METHOD FOR OPERATING A THRUST CHAMBER DEVICE

Rocket Engine Systems with a Supercritical Coolant

MULTI-PART FLUID CHAMBER AND METHOD OF MANUFACTURING

OMNIVOROUS SOLAR THERMAL THRUSTER, COOLING SYSTEMS, AND THERMAL ENE...

COMBUSTOR FOR ROCKET ENGINE AND METHOD FOR MANUFACTURING IT

ROCKET ENGINE SECTION HAVING A POROUS INNER WALL PORTION AND METHOD...

COMBUSTOR OF LIQUID ROCKET ENGINE

HYBRID SOLAR THERMAL AND CHEMICAL VEHICLE CONFIGURATIONS FOR SPACE...

LIQUID ROCKET ENGINE TAP-OFF POWER SOURCE

JET NOZZLE EQUIPPED WITH A THERMALLY REGULATED RING

STAGED COMBUSTION LIQUID ROCKET ENGINE CYCLE WITH THE TURBOPUMP UNI...

Tripropellant Rotating Detonation Rocket Engine Systems

LIQUID-COOLED AIR-BREATHING ROCKET ENGINE

THRUST CHAMBER INTEGRATED WITH IGNITER OF ROCKET ENGINE USING CRYOG...

COMBUSTION CHAMBER SECTION WITH INTEGRAL BAFFLE AND METHOD OF MAKIN...

COMBUSTION CHAMBER WITH VIBRATION DAMPING INNER WALL SHAPE AND METH...