US20130266298A1 - Local heat treatment of ibr blade using infrared heating - Google Patents
Local heat treatment of ibr blade using infrared heating Download PDFInfo
- Publication number
- US20130266298A1 US20130266298A1 US13/912,543 US201313912543A US2013266298A1 US 20130266298 A1 US20130266298 A1 US 20130266298A1 US 201313912543 A US201313912543 A US 201313912543A US 2013266298 A1 US2013266298 A1 US 2013266298A1
- Authority
- US
- United States
- Prior art keywords
- heat
- airfoil
- heat source
- housing
- rays
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/04—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering with simultaneous application of supersonic waves, magnetic or electric fields
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
- F01D5/286—Particular treatment of blades, e.g. to increase durability or resistance against corrosion or erosion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/34—Rotor-blade aggregates of unitary construction, e.g. formed of sheet laminae
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/40—Heat treatment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49316—Impeller making
- Y10T29/49336—Blade making
Definitions
- the manufacture, service and/or repair of metal components often times require localized heating of specific areas of the components. This is done, for example, to allow for stress relief, metal forming and/or brazing applications. Localized heating is preferred when processing the entire component could adversely affect the metallurgical properties of the component. Warping and other forms of deformation are also to be avoided.
- Integrally bladed rotors are used in some gas turbine engines and are expected to be used even more as engine designs continue to evolve. Upon original manufacture, all integrally bladed rotor material is heat treated to obtain the desired mechanical properties prior to finish dimension machining.
- the present invention comprises the use of focused infrared heat lamps to locally heat treat and/or stress relieve portions of integrally bladed rotors without adversely impacting other critical areas of the integrally bladed rotors. This is done by the use of infrared heat sources on the individual integral blades in an inert environment which in one form uses parabolic mirrors to focus heat only onto the desired area.
- a fixture is provided that locates the device at the precise location where heat is to be applied to a localized area, such as after a replacement blade has been attached by welding to a rotor.
- the present invention may also be used in the initial manufacture of integrally bladed rotors to locally heat treat areas after details have been attached to the rotor, such as by welding or to locally create alternate material properties.
- FIG. 1 is a perspective view showing the device of this invention.
- FIG. 2 is a plan view showing the device of this invention focused on a single integrally bladed rotor.
- FIG. 3 is a section view taken along line 2 - 2 of FIG. 2 .
- Device 10 is positioned proximate an integrally bladed rotor (IBR) airfoil 11 for heating a portion of the IBR airfoil 11 and thereby eliminate overall part exposure to heat.
- Device 10 includes a pair of infrared (IR) lamp housings 13 and 15 , each with an IR lamp generating IR rays that are reflected off parabolic minors 17 and 19 , respectively, to contact IBR 11 and heat treat that blade without exposing any other part of IBR airfoil 11 to unwanted heat.
- IR infrared
- FIG. 1 illustrates a complete integrally bladed rotor with rotor hub 21 supporting a plurality of other airfoils 23 .
- Device 10 is positioned on airfoil 11 and includes electrical contacts 25 connected to a power source, not shown, for actuation of IR lamps 27 that are held in place by clips 29 .
- Rays from IR lamps 27 are focused by mirrors 17 and 19 as an elongated band of IR radiation on a specific portion of airfoil 11 , in this instance the portion of airfoil 11 attached to rotor hub 21 .
- the width of the band of focused IR radiation may be any width that permits complete heat treatment of the desired portions of the component. Band widths may range from about 6 mm to about 18 mm, and may be about a 12 mm band width. Other widths may also be accommodated depending on, for example, the size of the parts, the material being heat treated
- Device 10 also includes tubes or passages 33 , shown more clearly in FIG. 3 , that are connected to a source of water or other cooling medium, not shown, to cool portions of device 10 to prevent distortion and a resulting uneven heating.
- Other cooling devices such as fans and refrigerants may also be used.
- dashed lines 37 that represent the extent of unfocused IR rays from lamps 27
- dashed lines 39 represent the extent of IR rays focused by minors 17 and 19 onto the portion of airfoil 11 that is to be heat treated, such as to relieve stress in the metal after welding airfoil 11 to rotor hub 21 .
- the present invention was used to heat treat and stress relieve a plurality of IBR blades without adversely heating other critical areas of the IBR.
- replacement blades have been attached to an IBR by focusing the heat only at the desired location, e.g., where the replacement blade is attached to the IBR.
- a complete blade replacement for an IBR using the present invention produced no stress or distortion on the rest of the assembly.
- the device of this invention is suitable for OEM manufacture and for repair of existing IBR systems.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Laser Beam Processing (AREA)
Abstract
A device and method for locally heat treating at least one airfoil in an integrally bladed rotor device. A pair of IR heat sources are positioned to direct IR heat rays in the direction where local heat treatment is required. A pair of parabolic mirrors are positioned to direct the IR heat rays on to the metal component. The heat treating is useful after welding the airfoil on to the rotor device.
Description
- This application is a continuation of U.S. patent application Ser. No. 13/184,733, filed Jul. 18, 2011.
- The manufacture, service and/or repair of metal components, such as gas turbine engines, often times require localized heating of specific areas of the components. This is done, for example, to allow for stress relief, metal forming and/or brazing applications. Localized heating is preferred when processing the entire component could adversely affect the metallurgical properties of the component. Warping and other forms of deformation are also to be avoided.
- Integrally bladed rotors are used in some gas turbine engines and are expected to be used even more as engine designs continue to evolve. Upon original manufacture, all integrally bladed rotor material is heat treated to obtain the desired mechanical properties prior to finish dimension machining.
- During blade repair operations, it may be necessary to locally heat treat the repaired areas of the integrally bladed rotors that have been exposed to elevated temperatures. In the finished machine condition, conventional heat treatment is not always possible due to concerns with distortion. Additionally, conventional heat treatment of a finished machined integrally bladed rotor may create unnecessary risk due to the potential for surface contamination throughout the entire part. Because of these concerns, local heat treatment has been considered to be a desirable option.
- The present invention comprises the use of focused infrared heat lamps to locally heat treat and/or stress relieve portions of integrally bladed rotors without adversely impacting other critical areas of the integrally bladed rotors. This is done by the use of infrared heat sources on the individual integral blades in an inert environment which in one form uses parabolic mirrors to focus heat only onto the desired area. A fixture is provided that locates the device at the precise location where heat is to be applied to a localized area, such as after a replacement blade has been attached by welding to a rotor. The present invention may also be used in the initial manufacture of integrally bladed rotors to locally heat treat areas after details have been attached to the rotor, such as by welding or to locally create alternate material properties.
-
FIG. 1 is a perspective view showing the device of this invention. -
FIG. 2 is a plan view showing the device of this invention focused on a single integrally bladed rotor. -
FIG. 3 is a section view taken along line 2-2 ofFIG. 2 . -
Device 10 is positioned proximate an integrally bladed rotor (IBR)airfoil 11 for heating a portion of theIBR airfoil 11 and thereby eliminate overall part exposure to heat.Device 10 includes a pair of infrared (IR)lamp housings parabolic minors IBR 11 and heat treat that blade without exposing any other part ofIBR airfoil 11 to unwanted heat. -
FIG. 1 illustrates a complete integrally bladed rotor withrotor hub 21 supporting a plurality ofother airfoils 23.Device 10 is positioned onairfoil 11 and includeselectrical contacts 25 connected to a power source, not shown, for actuation ofIR lamps 27 that are held in place byclips 29. Rays fromIR lamps 27 are focused bymirrors airfoil 11, in this instance the portion ofairfoil 11 attached torotor hub 21. The width of the band of focused IR radiation may be any width that permits complete heat treatment of the desired portions of the component. Band widths may range from about 6 mm to about 18 mm, and may be about a 12 mm band width. Other widths may also be accommodated depending on, for example, the size of the parts, the material being heat treated -
Device 10 also includes tubes orpassages 33, shown more clearly inFIG. 3 , that are connected to a source of water or other cooling medium, not shown, to cool portions ofdevice 10 to prevent distortion and a resulting uneven heating. Other cooling devices such as fans and refrigerants may also be used. - Also shown in
FIG. 3 are dottedlines 37 that represent the extent of unfocused IR rays fromlamps 27, and dashedlines 39 represent the extent of IR rays focused byminors airfoil 11 that is to be heat treated, such as to relieve stress in the metal after weldingairfoil 11 torotor hub 21. - It is known that heat treatment in the presence of oxygen can cause titanium alloys to become embrittled if the temperature exceeds 1,000° F. (538° C.). In addition to embrittlement, the material properties of titanium alloys changes if it is exposed to a temperature exceeding 800° F. (427° C.), but as will be understood the actual temperature depends on the specific alloy. Oxygen contamination at referenced temperatures can be avoided by proper protection such as the use of inert shielding gas. The present invention ensures that the portion(s) of the product being treated will receive desired thermal treatment but generally remain below 1,000° F. (538° C.) and even below 800° F. (427° C.).
- The present invention was used to heat treat and stress relieve a plurality of IBR blades without adversely heating other critical areas of the IBR. In addition, replacement blades have been attached to an IBR by focusing the heat only at the desired location, e.g., where the replacement blade is attached to the IBR. A complete blade replacement for an IBR using the present invention produced no stress or distortion on the rest of the assembly. The device of this invention is suitable for OEM manufacture and for repair of existing IBR systems.
- While the invention has been described with reference to an exemplary embodiment(s), it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment(s) disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (15)
1. A device for heat treating a metal component, comprising:
at least one parabolic mirror formed in the axially extending cavity; and
at least one IR heat source for providing IR heat rays in a direction toward the at least one parabolic mirror;
such that the at least one parabolic mirror is positioned to focus a band of the IR heat rays onto the metal component.
2. The device of claim 1 , wherein the metal part is at least one airfoil in an integrally bladed rotor.
3. The device of claim 2 , wherein the IR heat source and parabolic mirror are sized to direct the IR heat rays along the junction between the airfoil and the integrally bladed rotor device.
4. The device of claim 3 , which includes a pair of housings on opposite sides of the entire area of contact between the airfoil and the integrally bladed rotor device, with each housing having an IR heat source and a parabolic minor formed in the housing for each IR heat source.
5. The device of claim 4 , wherein each of the pair of IR heat sources are mounted to its respective housing with a clip.
6. The device of claim 5 wherein the parabolic mirror directs the IR heat rays to a region of the airfoil where it is joined to the integrally bladed rotor device.
7. The device of claim 1 , wherein the IR heat rays are focused into an elongated band having a band width of from about 6 mm to about 18 mm.
8. The device of claim 2 , which further includes a cooling element for each IR heat source for maintaining a desired temperature for the IR heat source.
9. The device of claim 8 , wherein the cooling element is part of the housing having an axial passage adapted to transfer cooling liquid through the passage, and the housing extends along the airfoil.
10. The device of claim 9 , wherein the housing includes a cavity forming a parabolic minor and the IR heat source is mounted in the cavity to focus the IR heat rays on the junction of the airfoil where it is joined to the integrally bladed rotor device.
11. A system for heat treating at least one airfoil in an integrally bladed rotor device, the system comprising:
at least one IR heat source means mounted in a position for directing IR heat rays in a direction; and
at least one parabolic mirror means for reflecting the IR rays on to the at least one portion of an airfoil.
12. The system of claim 11 , which includes a pair of housings each having an axially extending cavity, the cavity forming the parabolic minor, the housings further each positioning an IR heat source, wherein the pair of IR heat sources are facing in opposite directions and each IR heat source is aligned with the parabolic minor.
13. The system of claim 12 , wherein the parabolic minor directs the IR heat rays radially inward to the airfoil where it is joined to the integrally bladed rotor device.
14. The system of claim 13 , which further includes a cooling element for each IR heat source for maintaining a desired temperature for the IR heat source.
15. The system of claim 14 , wherein the cooling element is part of a housing having an axial passage adapted to transfer cooling liquid through the passage, and the housing extends along the width of the airfoil.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/912,543 US20130266298A1 (en) | 2011-07-18 | 2013-06-07 | Local heat treatment of ibr blade using infrared heating |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/184,733 US8611732B2 (en) | 2011-07-18 | 2011-07-18 | Local heat treatment of IBR blade using infrared heating |
US13/912,543 US20130266298A1 (en) | 2011-07-18 | 2013-06-07 | Local heat treatment of ibr blade using infrared heating |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/184,733 Continuation US8611732B2 (en) | 2011-07-18 | 2011-07-18 | Local heat treatment of IBR blade using infrared heating |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130266298A1 true US20130266298A1 (en) | 2013-10-10 |
Family
ID=46125273
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/184,733 Active 2032-01-01 US8611732B2 (en) | 2011-07-18 | 2011-07-18 | Local heat treatment of IBR blade using infrared heating |
US13/912,543 Abandoned US20130266298A1 (en) | 2011-07-18 | 2013-06-07 | Local heat treatment of ibr blade using infrared heating |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/184,733 Active 2032-01-01 US8611732B2 (en) | 2011-07-18 | 2011-07-18 | Local heat treatment of IBR blade using infrared heating |
Country Status (3)
Country | Link |
---|---|
US (2) | US8611732B2 (en) |
EP (1) | EP2548974B1 (en) |
SG (1) | SG187309A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9635566B2 (en) * | 2014-04-25 | 2017-04-25 | At&T Intellectual Property I, L.P. | Enhancement of access points to support heterogeneous networks |
WO2016064389A1 (en) * | 2014-10-23 | 2016-04-28 | Siemens Aktiengesellschaft | Gas turbine clearance control system including electric radiant infrared heater and corresponding method of operating a gas turbine engine |
CN111635989A (en) * | 2020-07-01 | 2020-09-08 | 西安交通大学 | On-site high-precision heat treatment device for turbine blade |
Citations (2)
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US20110013892A1 (en) * | 2006-06-26 | 2011-01-20 | Tp Solar, Inc. | Rapid Thermal Firing IR Conveyor Furnace Having High Intensity Heating Section |
US8314368B2 (en) * | 2008-02-22 | 2012-11-20 | Applied Materials, Inc. | Silver reflectors for semiconductor processing chambers |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
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US3264472A (en) | 1962-09-11 | 1966-08-02 | Cleveland Technical Ct Inc | Track rail snow and ice melter |
SE340257B (en) * | 1968-11-13 | 1971-11-15 | Infraroedteknik Ab | |
JPS6167719A (en) | 1984-09-11 | 1986-04-07 | Nippon Kokan Kk <Nkk> | Method for heat treatment of rail |
US6242717B1 (en) * | 1999-08-30 | 2001-06-05 | Lucent Technologies Inc. | Removable reflector rack for an ultraviolet curing oven |
DE10055877C1 (en) * | 2000-11-08 | 2002-05-02 | Germanflux Noha Gmbh | Radiator system for heat treatment of materials of different states has quartz glass tube with mechanical cleaning devices, and coating on inner surface to control radiated power at heating material |
US6560870B2 (en) | 2001-05-08 | 2003-05-13 | General Electric Company | Method for applying diffusion aluminide coating on a selective area of a turbine engine component |
JP4213717B2 (en) * | 2003-11-20 | 2009-01-21 | パナソニック株式会社 | Infrared bulb and heating device |
US7077547B2 (en) * | 2004-07-29 | 2006-07-18 | Nordson Corporation | Shuttered lamp assembly and method of cooling the lamp assembly |
US20070047932A1 (en) * | 2005-08-31 | 2007-03-01 | Branson Ultrasonics Corporation | Waveguide for plastics welding using an incoherent infrared light source |
JP4160079B2 (en) * | 2006-02-28 | 2008-10-01 | 住友重機械テクノフォート株式会社 | Billet conveyor |
US7977611B2 (en) * | 2007-07-19 | 2011-07-12 | United Technologies Corporation | Systems and methods for providing localized heat treatment of metal components |
US7775690B2 (en) * | 2008-04-30 | 2010-08-17 | Adastra Technologies, Inc. | Gas cooled reflector structure for axial lamp tubes |
US20120279066A1 (en) | 2011-05-06 | 2012-11-08 | United Technologies Corporation | WELDING Ti-6246 INTEGRALLY BLADED ROTOR AIRFOILS |
US8437628B1 (en) * | 2011-07-18 | 2013-05-07 | United Technologies Corporation | Method and apparatus of heat treating an integrally bladed rotor |
-
2011
- 2011-07-18 US US13/184,733 patent/US8611732B2/en active Active
-
2012
- 2012-04-24 SG SG2012029906A patent/SG187309A1/en unknown
- 2012-05-18 EP EP12168583.8A patent/EP2548974B1/en active Active
-
2013
- 2013-06-07 US US13/912,543 patent/US20130266298A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110013892A1 (en) * | 2006-06-26 | 2011-01-20 | Tp Solar, Inc. | Rapid Thermal Firing IR Conveyor Furnace Having High Intensity Heating Section |
US8314368B2 (en) * | 2008-02-22 | 2012-11-20 | Applied Materials, Inc. | Silver reflectors for semiconductor processing chambers |
Also Published As
Publication number | Publication date |
---|---|
EP2548974A1 (en) | 2013-01-23 |
SG187309A1 (en) | 2013-02-28 |
US8611732B2 (en) | 2013-12-17 |
US20130022339A1 (en) | 2013-01-24 |
EP2548974B1 (en) | 2014-02-19 |
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Owner name: UNITED TECHNOLOGIES CORPORATION, CONNECTICUT Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DEMICHAEL, THOMAS;MOOR, JAMES J.;CHIN, HERBERT A.;AND OTHERS;SIGNING DATES FROM 20110624 TO 20110705;REEL/FRAME:030567/0490 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |