US20090314456A1 - Device for Producing a Metal Strip by Continuous Casting - Google Patents
Device for Producing a Metal Strip by Continuous Casting Download PDFInfo
- Publication number
- US20090314456A1 US20090314456A1 US12/227,538 US22753807A US2009314456A1 US 20090314456 A1 US20090314456 A1 US 20090314456A1 US 22753807 A US22753807 A US 22753807A US 2009314456 A1 US2009314456 A1 US 2009314456A1
- Authority
- US
- United States
- Prior art keywords
- milling
- slab
- descaling
- accordance
- machine
- 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
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 12
- 239000002184 metal Substances 0.000 title claims abstract description 12
- 238000009749 continuous casting Methods 0.000 title claims abstract description 11
- 238000003801 milling Methods 0.000 claims abstract description 68
- 238000005266 casting Methods 0.000 claims abstract description 19
- 238000003754 machining Methods 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims description 13
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/026—Rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
Definitions
- the in-line milling machine requires building space.
- the slab temperature loss in the vicinity of the machine is an interfering factor. This applies to installation after the casting machine, since the casting speed (mass flow) is usually low.
- the temperature loss is disadvantageous, because, especially in the case of relatively thin strip, a high final rolling temperature, combined with an acceptable strip runout speed from the finishing train, is actively sought.
- the descaling system and the milling machine can thus be activated simultaneously.
- it can generally be advantageously provided, when the surface quality is good, that either the milling machine or the descaling system is used.
- FIG. 1 is a schematic side view of a device for producing a metal strip by continuous casting, in which a milling machine and a descaling system are used.
- high-pressure nozzles 10 are installed in the housing 7 in the form of nozzle spray bars, which extend over the entire length of the slab 3 (i.e., in the direction normal to the plane of the drawing in FIG. 2 ).
- the high-pressure nozzles 10 deliver water in a well-known way to the surface of the strip to remove scale from the surface.
- the proposed idea is thus aimed at completely integrating the milling machine in the vicinity of the descaling sprayer.
- the two surface-controlling devices (descaling sprayer, milling machine) can thus be selectively used in a flexible way.
- the water from the descaling sprayer can simultaneously be used to flush away the milled cuttings.
Abstract
Description
- The invention concerns a device for producing a metal strip by continuous casting with a casting machine in which a slab is cast, preferably a thin slab, where at least one milling machine is installed downstream of the casting machine in the direction of conveyance of the slab, at least one surface of which and preferably two opposite surfaces of which can be milled down in the one or more milling machines, and where at least one descaling system is installed downstream of the casting machine in the direction of conveyance of the slab.
- In the continuous casting of slabs in a continuous casting installation, surface defects can develop, for example, oscillation marks, casting flux defects, or longitudinal and transverse surface cracks. These occur in both conventional and thin-slab casting machines. Therefore, the conventional slabs are subjected to flame descaling in some cases, depending on the intended use of the finished strip. Many slabs are subjected to flame descaling as a general rule at the customer's request. In this connection, the requirements on surface quality have been continuously increasing in thin-slab installations.
- Flame descaling, grinding, and milling are available methods of surface treatment.
- Flame descaling has the disadvantage that the material that has been flashed off cannot be melted down again without processing due to the high oxygen content. In the case of grinding, slivers of metal become mixed with the grinding wheel dust, so that the abraded material must be disposed of. Both methods are difficult to adapt to the given conveyance speed.
- Therefore, surface treatment by milling must be considered. The hot millings are collected during the milling operation. They can then be briquetted and melted down again without processing and without any problems and thus returned to the production process. Furthermore, the miller speed can be easily adjusted to the conveyance speed (casting speed, feeding speed into the finishing train). The device of the aforesaid type that constitutes the object of the invention thus involves the use of milling.
- A device for producing a metal strip by continuous casting, in which a milling machine is used for milling down the surface of a slab, is already known, for example, from CH 584 085 and DE 199-50 886 A1.
- A similar device is also disclosed by DE 71 11 221 U1. This document discloses the processing of aluminum strip with utilization of the casting heat, in which the machine is connected with the casting installation.
- In-line removal of material from the surface of a thin slab (flame descaling, milling, etc.) shortly before a rolling train on the upper side and underside or on only one side has also already been proposed. EP 1 093 866 A2 is cited in this connection.
- DE 197 17 200 A1 discloses another embodiment of a surface milling machine. This document describes, among other things, the adjustability of the milling contour of the milling device, which is installed downstream of the continuous casting installation or upstream of a rolling train.
- Another embodiment and arrangement of an in-line milling machine in a conventional hot strip mill for treating a near-net strip are proposed by EP 0 790 093 B1, EP 1 213 076 B1, and EP 1 213 077 B1.
- In the surface treatment of thin slabs in a so-called CSP plant, about 0.1-2.5 mm should be removed from the surface on one or both sides of the hot slab in the processing line (“in line”), depending on the surface defects that are detected. A thin slab that is as thick as possible is advisable (H=60-120 mm) so as not to diminish the output too much.
- The in-line milling machine is not generally used for all products of a rolling program but rather only for those that have relatively high surface requirements. This is advantageous from the standpoint of output, reduces milling machine wear, and therefore is useful.
- The in-line milling machine requires building space. The slab temperature loss in the vicinity of the machine is an interfering factor. This applies to installation after the casting machine, since the casting speed (mass flow) is usually low. However, even before the finishing train, the temperature loss is disadvantageous, because, especially in the case of relatively thin strip, a high final rolling temperature, combined with an acceptable strip runout speed from the finishing train, is actively sought.
- Therefore, the objective of the present invention is to improve a device for producing a metal strip by continuous casting with the use of a milling machine in such a way that optimum slab machining is possible, even with different process-engineering requirements. In particular, temperature losses during slab processing and machining are to be kept small.
- The solution to this problem in accordance with the invention is characterized by the fact that the milling machine and the descaling system are realized as an integral unit.
- In this regard, the milling machine and the descaling system are preferably housed in a common housing.
- The milling machine can comprise two milling cutters. The descaling system preferably comprises high-pressure nozzles for descaling fluid. However, it is also possible to use other types of descaling elements which in themselves are already known from the prior art (e.g., ultrasonic descaling elements).
- A modification of the invention provides that a plurality of high-pressure nozzles is arranged in the milling and descaling unit in the direction of conveyance.
- In addition, it can be provided that a furnace is installed upstream of the milling and descaling unit with respect to the direction of conveyance. One milling cutter each can be installed for machining the upper side and the underside of the slab. The two milling cutters can be spaced some distance apart in the direction of conveyance. In addition, it can be provided that each milling cutter cooperates with a support roll arranged on the other side of the slab.
- A rolling stand or a rolling train is usually installed downstream of the milling and descaling unit with respect to the direction of conveyance.
- The device is preferably designed in such a way that two different operating modes can be used. In accordance with a first possibility, it is provided that the device is designed in such a way that the descaling system and the milling machine can be alternatively used at one's option. In a second alternative, it is provided that the device is designed in such a way that the descaling system and the milling machine can be operated at the same time.
- The descaling system and the milling machine can thus be activated simultaneously. However, in order to produce a high run-in temperature into the rolling train, it can generally be advantageously provided, when the surface quality is good, that either the milling machine or the descaling system is used.
- The proposed solution makes it possible to keep temperature losses low during slab processing and machining. This results in the qualitatively improved production of slabs, especially thin slabs.
- Furthermore, it is a considerable advantage that the slab production can be carried out much more economically and ecologically as far as the milling of the slab surface and the descaling are concerned. Specifically, it becomes possible in a very advantageous way to use the fluid (water) needed for the descaling also to support the milling process, so that the fluid requirement for this is significantly reduced.
- A specific embodiment of the invention is illustrated in the drawings.
-
FIG. 1 is a schematic side view of a device for producing a metal strip by continuous casting, in which a milling machine and a descaling system are used. -
FIG. 2 is an enlarged section ofFIG. 1 showing the milling and descaling unit. -
FIG. 1 shows a device for producing a metal strip 1 by continuous casting. The metal strip 1 or thecorresponding slab 3 is continuously cast by well-known means in acasting machine 2. Theslab 3 is preferably a thin slab. Immediately downstream of thecasting machine 2, theslab 3 is cleaned in acleaning installation 15. A surface inspection is then performed by means of a surface measuring device 16. Theslab 3 then enters afurnace 11 for the purpose of holding it at a desired process temperature. The furnace is followed by atransverse conveyor 17. - Downstream of the
furnace 11 and thetransverse conveyor 17, theslab 3 enters an integratedunit 6 that consists of a combinedmilling machine 4 anddescaling system 5. Themilling machine 4 and thedescaling system 5 have acommon housing 7 or at least are arranged very close together. In theintegrated unit 8, theslab 3 is subjected to a combined milling and/or descaling process. Following this operation—as viewed in the direction of conveyance F of the strip 1 orslab 3—the metal strip 1 enters a single-stand or multiple-stand rolling train. A rollingstand 13 and a rollingstand 14 are indicated inFIG. 1 . - Details of the
integrated unit 6, which consists of the combined milling machine and descaling system, are shown inFIG. 2 . - Two
milling cutters housing 7 some distance apart in the direction of conveyance F. Themilling cutter 8 that is on the upstream side with respect to the direction of conveyance F mills the underside of theslab 3 in a way that in itself is already well known. Themilling cutter 9 that is on the downstream side with respect to the direction of conveyance F mills the upper side of theslab 3. Bothmilling cutters slab 3 from eachmilling cutter - As the drawing also shows, high-
pressure nozzles 10 are installed in thehousing 7 in the form of nozzle spray bars, which extend over the entire length of the slab 3 (i.e., in the direction normal to the plane of the drawing inFIG. 2 ). The high-pressure nozzles 10 deliver water in a well-known way to the surface of the strip to remove scale from the surface. Naturally, it is also basically possible to use other types of descaling elements. - It is advantageous that the water delivered by the
nozzles 10 can simultaneously be used to cool themilling cutters - A collecting tank 18 for milled material or for scale is arranged below the
integral unit 6. Devices for removing milled cuttings and/or scale can also be provided there. - A
surface inspection 20 can be performed upstream of theintegral unit 6. In addition, in the illustrated specific embodiment, a profile measurement 19 is provided. - The proposed
integral unit 6 with amilling machine 4 and adescaling system 5 can thus be optimally adapted to the specific application and has the task of optimizing temperature control at high temperature or with low temperature loss. - The proposed idea is thus aimed at completely integrating the milling machine in the vicinity of the descaling sprayer. The two surface-controlling devices (descaling sprayer, milling machine) can thus be selectively used in a flexible way. The water from the descaling sprayer can simultaneously be used to flush away the milled cuttings.
-
- 1 metal strip
- 2 casting machine
- 3 slab
- 4 milling machine
- 5 descaling system
- 6 integral unit
- 7 housing
- 8 milling cutter
- 9 milling cutter
- 10 high-pressure nozzle
- 11 furnace
- 12 support roll
- 13 rolling stand
- 14 rolling stand
- 15 cleaning installation
- 16 surface measuring device
- 17 transverse conveyor
- 18 collecting tank
- 19 profile measurement
- 20 surface inspection
- F direction of conveyance
Claims (11)
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006024586 | 2006-05-26 | ||
DE102006024586.5 | 2006-06-26 | ||
DE102007022928.5 | 2007-05-14 | ||
DE102007022928A DE102007022928A1 (en) | 2006-05-26 | 2007-05-14 | Apparatus for producing a metal strip by continuous casting |
PCT/EP2007/004578 WO2007137747A1 (en) | 2006-05-26 | 2007-05-23 | Device for producing a metal strip by continuous casting |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090314456A1 true US20090314456A1 (en) | 2009-12-24 |
Family
ID=38438670
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/227,538 Abandoned US20090314456A1 (en) | 2006-05-26 | 2007-05-23 | Device for Producing a Metal Strip by Continuous Casting |
Country Status (16)
Country | Link |
---|---|
US (1) | US20090314456A1 (en) |
EP (1) | EP2032286B1 (en) |
JP (1) | JP4966372B2 (en) |
KR (1) | KR101037076B1 (en) |
AR (1) | AR061189A1 (en) |
AT (1) | ATE541657T1 (en) |
AU (1) | AU2007267401B2 (en) |
BR (1) | BRPI0712470A2 (en) |
CA (1) | CA2651744C (en) |
DE (1) | DE102007022928A1 (en) |
EG (1) | EG24981A (en) |
ES (1) | ES2376763T3 (en) |
MX (1) | MX2008015060A (en) |
RU (1) | RU2396143C1 (en) |
TW (1) | TW200819223A (en) |
WO (1) | WO2007137747A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3791258A (en) * | 1972-03-15 | 1974-02-12 | Technica Guss Gmbh | Strand milling machine |
US3983889A (en) * | 1974-05-20 | 1976-10-05 | Leichtmetall-Gesellschaft Mbh | Process for cleaning the surface of continuously cast strip |
US4197043A (en) * | 1977-06-28 | 1980-04-08 | Loewy Robertson Engineering Company Limited | Slab milling machine |
US5634257A (en) * | 1994-05-17 | 1997-06-03 | Hitachi, Ltd. | Hot strip rolling plant and method directly combined with continuous casting |
US6436205B1 (en) * | 1999-11-04 | 2002-08-20 | Sms Demag Ag | Method for surface processing of a continuously cast steel product and device therefor |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7111221U (en) | Prolizenz Ag | Device for the continuous processing of the surfaces of cast metal strips | ||
DE2401732C2 (en) | 1974-01-15 | 1975-12-18 | Technica-Guss Gmbh, 8700 Wuerzburg | Strand milling machine |
JPH0673694B2 (en) * | 1988-09-20 | 1994-09-21 | 株式会社日立製作所 | Descaling device for rolled material, hot rolling equipment, and rolled material |
DE4118960A1 (en) | 1991-06-08 | 1992-12-10 | Thaelmann Schwermaschbau Veb | Prodn. of billets for hot-rolling installations - by cutting a cast pipe-length into a helical ribbon and then straightening |
IT1259487B (en) * | 1992-08-26 | 1996-03-20 | Danieli Off Mecc | PROCESS FOR THE PRODUCTION OF THIN SHEETS AND COMPACT LAMINATION PLANT ADOPTING SUCH PROCEDURE |
JPH08103812A (en) * | 1994-10-05 | 1996-04-23 | Sumitomo Metal Ind Ltd | Rotary cutting tool for scale removing of hot steel stock and scale removing method |
CA2200740C (en) | 1995-07-24 | 2004-02-24 | Kawasaki Steel Corporation | Surface cutting method and apparatus for hot-rolled steel products |
JPH10137801A (en) * | 1996-11-05 | 1998-05-26 | Hitachi Cable Ltd | Method for improving surface quality of rough drawn wire and device therefor |
DE19717200B4 (en) | 1997-04-24 | 2005-05-25 | Sms Demag Ag | Device for processing the surface of hot slabs or strips |
DE19950886A1 (en) | 1999-10-22 | 2001-04-26 | Sms Demag Ag | Method and device for improving the quality of the surface of the cast strand of a continuous caster |
DE10023480A1 (en) | 2000-05-10 | 2001-11-15 | Sms Demag Ag | Process for skimming oxidic rolled copper bars after casting in a continuous casting machine comprises wetting the casting with an emulsion mixed with reductant, and injecting a diluted aqueous hydrocarbon-containing solution as reductant |
JP3951889B2 (en) * | 2002-10-30 | 2007-08-01 | Jfeスチール株式会社 | Manufacturing method and equipment for hot-rolled steel |
-
2007
- 2007-05-14 DE DE102007022928A patent/DE102007022928A1/en not_active Withdrawn
- 2007-05-22 TW TW096118119A patent/TW200819223A/en unknown
- 2007-05-23 ES ES07725478T patent/ES2376763T3/en active Active
- 2007-05-23 WO PCT/EP2007/004578 patent/WO2007137747A1/en active Application Filing
- 2007-05-23 RU RU2008151783/02A patent/RU2396143C1/en not_active IP Right Cessation
- 2007-05-23 EP EP07725478A patent/EP2032286B1/en not_active Not-in-force
- 2007-05-23 MX MX2008015060A patent/MX2008015060A/en unknown
- 2007-05-23 JP JP2009511405A patent/JP4966372B2/en not_active Expired - Fee Related
- 2007-05-23 KR KR1020087026581A patent/KR101037076B1/en not_active IP Right Cessation
- 2007-05-23 US US12/227,538 patent/US20090314456A1/en not_active Abandoned
- 2007-05-23 CA CA2651744A patent/CA2651744C/en not_active Expired - Fee Related
- 2007-05-23 AU AU2007267401A patent/AU2007267401B2/en not_active Ceased
- 2007-05-23 BR BRPI0712470-8A patent/BRPI0712470A2/en not_active IP Right Cessation
- 2007-05-23 AT AT07725478T patent/ATE541657T1/en active
- 2007-05-24 AR ARP070102273A patent/AR061189A1/en not_active Application Discontinuation
-
2008
- 2008-11-06 EG EG2008111805A patent/EG24981A/en active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3791258A (en) * | 1972-03-15 | 1974-02-12 | Technica Guss Gmbh | Strand milling machine |
US3983889A (en) * | 1974-05-20 | 1976-10-05 | Leichtmetall-Gesellschaft Mbh | Process for cleaning the surface of continuously cast strip |
US4197043A (en) * | 1977-06-28 | 1980-04-08 | Loewy Robertson Engineering Company Limited | Slab milling machine |
US5634257A (en) * | 1994-05-17 | 1997-06-03 | Hitachi, Ltd. | Hot strip rolling plant and method directly combined with continuous casting |
US6436205B1 (en) * | 1999-11-04 | 2002-08-20 | Sms Demag Ag | Method for surface processing of a continuously cast steel product and device therefor |
Also Published As
Publication number | Publication date |
---|---|
AR061189A1 (en) | 2008-08-13 |
CA2651744C (en) | 2010-07-20 |
TW200819223A (en) | 2008-05-01 |
KR20080108323A (en) | 2008-12-12 |
EG24981A (en) | 2011-04-10 |
MX2008015060A (en) | 2009-02-10 |
EP2032286A1 (en) | 2009-03-11 |
KR101037076B1 (en) | 2011-05-26 |
CA2651744A1 (en) | 2007-12-06 |
DE102007022928A1 (en) | 2007-12-13 |
JP2009538229A (en) | 2009-11-05 |
EP2032286B1 (en) | 2012-01-18 |
ES2376763T3 (en) | 2012-03-16 |
WO2007137747A1 (en) | 2007-12-06 |
BRPI0712470A2 (en) | 2012-07-31 |
ATE541657T1 (en) | 2012-02-15 |
RU2396143C1 (en) | 2010-08-10 |
AU2007267401B2 (en) | 2010-03-18 |
AU2007267401A1 (en) | 2007-12-06 |
JP4966372B2 (en) | 2012-07-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SMS DEMAG AKTIENGESELLSCHAFT, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SEIDEL, JURGEN;SUDAU, PETER;REEL/FRAME:021902/0765;SIGNING DATES FROM 20081027 TO 20081104 |
|
AS | Assignment |
Owner name: SMS SIEMAG AKTIENGESELLSCHAFT, GERMANY Free format text: CHANGE OF NAME;ASSIGNOR:SMS DEMAG AG;REEL/FRAME:023725/0342 Effective date: 20090325 Owner name: SMS SIEMAG AKTIENGESELLSCHAFT,GERMANY Free format text: CHANGE OF NAME;ASSIGNOR:SMS DEMAG AG;REEL/FRAME:023725/0342 Effective date: 20090325 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |