US20060236729A1 - Plastic suds container for a washing machine - Google Patents

Plastic suds container for a washing machine Download PDF

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Publication number
US20060236729A1
US20060236729A1 US11/409,696 US40969606A US2006236729A1 US 20060236729 A1 US20060236729 A1 US 20060236729A1 US 40969606 A US40969606 A US 40969606A US 2006236729 A1 US2006236729 A1 US 2006236729A1
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US
United States
Prior art keywords
end wall
thickness
relief profiles
area
plastic
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
Application number
US11/409,696
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English (en)
Inventor
Matthias Hollenhorst
Andreas Kratzsch
Thorsten Kuka
Antje Nieder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Miele und Cie KG
Original Assignee
Miele und Cie KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Miele und Cie KG filed Critical Miele und Cie KG
Assigned to MIELE & CIE. KG reassignment MIELE & CIE. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HOLLENHORST, MATTHIAS, KRATZSCH, ANDREAS, KUKA, THORSTEN, NIEDER, ANTJE
Publication of US20060236729A1 publication Critical patent/US20060236729A1/en
Abandoned legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/261—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements
    • D06F37/262—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements made of plastic material, e.g. by injection moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/264—Tubs provided with reinforcing structures, e.g. ribs, inserts, braces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C2045/1486—Details, accessories and auxiliary operations
    • B29C2045/14868—Pretreatment of the insert, e.g. etching, cleaning
    • B29C2045/14877—Pretreatment of the insert, e.g. etching, cleaning preheating or precooling the insert for non-deforming purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts

Definitions

  • the present invention relates to a plastic suds container for a washing machine for receiving a drum rotatable therein, the plastic suds container having cylindrical shell and at least one end wall closing the shell, the shell and/or the end wall being provided with stabilizing means.
  • plastic suds container for washing machines which take the form of a cylindrical container enclosing the drum.
  • a metallic cross-shaped bearing member including a hub for receiving a drive shaft for the drum is incorporated in the molded plastic mass.
  • Injection-molding around the cross-shaped bearing member made of cast iron leads to considerable internal stresses, which result from the fact that the plastic shrinks as it cools from its solidification temperature to ambient temperature.
  • the resulting forces acting on the cross-shaped bearing member are so high that the cross-shaped bearing member may deform.
  • the forces can lead to cracks in the container wall, resulting in leaks and unstable connection of the cross-shaped bearing member.
  • British publication GB 2 333 300 A describes a plastic suds container having a bearing hub embedded in injection-molded plastic.
  • reinforcing ribs formed on and extending from the hub transfer and distribute the forces from the hub to the end wall of the suds container over as large an area as possible.
  • material stresses may be present in the transition regions between the hub and the plastic part.
  • the material accumulations in the area of the ribs may shrink to different extents during cooling, and may therefore lead to unwanted force peaks and/or material stresses in the transition regions. Excessive material stresses may lead to unwanted cracks, resulting in leakage of the suds container.
  • European Patent EP 0 835 729 B1 describes a plastic suds container for a washing machine.
  • Said suds container has circular surface depressions formed in one end wall. These surface depressions are provided with ribs in the manner of a grid. The circular surface depressions have a higher thermal conductivity than the remaining portion of the end wall or container wall.
  • an object of the present invention to provide a plastic suds container for a washing machine, in which is incorporated a cross-shaped bearing member or bearing hub made of metal, and which has improved durability and reduced susceptibility to cracking.
  • the present invention provides a plastic suds container for a washing machine for receiving a drum rotatable therein.
  • the plastic suds container includes a container wall having a cylindrical shell and an end wall at an end of the shell, the end wall defining a plane.
  • the end wall includes a stabilizing device and a plurality of channel-like relief profiles formed therein in limited regions within respective areas bounded by the stabilizing device.
  • Each of the relief profiles includes a hollow, the hollow being at least substantially surrounded by a remaining flat or unprofiled region of the respective area bounding the stabilizing device.
  • Each of the relief profiles is expandable and/or compressible in a respective direction of extension of the plane.
  • the present invention also provides a plastic suds container for a washing machine for receiving a drum rotatable therein.
  • the plastic suds container includes a container wall having a cylindrical shell and an end wall at an end of the shell, the end wall defining a plane.
  • the end wall includes a molded plastic portion, a metallic cross-shaped bearing member being disposed in the molded plastic portion.
  • the bearing member includes a hub configured to receive a drive shaft for the drum and includes at least one brace extending substantially radially outwardly from the hub.
  • the end wall includes a plurality of channel-like relief profiles formed therein in limited regions within respective areas bounded by the stabilizing device.
  • Each of the relief profiles includes a hollow, the hollow being at least substantially surrounded by a remaining flat or unprofiled region of the respective area bounding the stabilizing device.
  • Each of the relief profiles is expandable and/or compressible in a respective direction of extension of the plane.
  • the present invention also provides a plastic suds container for a washing machine for receiving a drum rotatable therein.
  • the plastic suds container includes a container wall having a cylindrical shell and an end wall at an end of the shell, the end wall defining a plane.
  • the end wall includes a stabilizing device and defines a plurality of channel-like relief profiles adjacent to respective flat or unprofiled areas in respective regions bounded by the stabilizing device. Each of the relief profiles is expandable and/or compressible in a respective direction of extension of the plane.
  • Advantages that can be achieved with the present invention are that the internal stresses within the plastic suds container, mainly in the plane of its container wall, are reduced by molding-in channel-like indentations (also referred to as relief profiles), so that the durability and/or load-carrying capacity of the plastic suds container, i.e., of the container wall, are increased.
  • the molded-in indentations are limited to certain regions, whereby partial elasticity is provided only in locations where the highest forces or force peaks occur. These force peaks frequently occur in container wall areas that are surrounded or enclosed by stabilizing means.
  • Possible stabilizing means include, for example, ribs or a cross-shaped bearing member inserted in the plastic material.
  • the molded-in indentations are designed such that the container wall forms a hollow as seen in the cross-sectional profile, said hollow being elastic in the direction of extension of the container wall because of its shape.
  • the remaining areas of the container wall, which are not deformed by indentations molded therein surround the molded-in indentation or relief profile completely or at least substantially completely, thereby providing that the stability is maintained to the extent possible.
  • the geometry of the profile is decisive for the function, because the resilient effect is greatest in the direction transverse to the indentation. In the longitudinal direction, i.e., under bending load, the profile can act as a stiffening rib.
  • the ideal geometry can be found if the internal stresses in the component are known.
  • the profiles are designed such that they are preferably well suited for a plurality of directions in which forces act. Therefore, in accordance with the present invention, the relief profiles provided in the area of the container wall are meander-shaped, star-shaped, oval, circular, or spherical in shape, the spherical relief profile corresponding only to the impression of a sphere that has been pressed in partially.
  • the spherical relief profile takes up internal stresses in nearly all directions in the plane of the container wall, and is therefore well suited for nearly all directions of expansion or shrinkage.
  • the thickness of the container wall in the area of the relief profiles is selected to be equal to the thickness of the remaining unprofiled areas. Because the relief profiles partially change the orientation of the container wall, the forces resulting from internal material stresses are also deflected in a defined manner according to the pattern of the relief profiles. This prevents stresses and/or force peaks from occurring in the material of the container wall.
  • the thickness of the container wall in the area of the relief profiles is selected to be smaller than the thickness of the remaining unprofiled areas. In this manner, any possible deformation caused by the forces resulting from the internal material stresses is mainly limited to the area of the relief profiles. In this area, the deformability is increased due to the reduced wall thickness.
  • the wall thickness in the area of the relief profiles is selected to be one-half to two-thirds of the thickness of the remaining unprofiled areas of the container wall.
  • the above-mentioned relief profiles can be used to advantage in plastic suds containers having components, such as a hub or counterweights, which are embedded in injection-molded plastic, and which are made of other materials and may cause internal stresses in the container wall because of their different cooling characteristic with respect to time.
  • Another reason for internal stresses in the container wall lies in different thicknesses of the plastic, such as reinforcing ribs or integrally connected components. This is primarily the case at locations which have different wall thicknesses and cannot be modified for functional reasons or for reasons of stability, such as rigid connection points. In this case, it is also advantageous to use the relief profiles described above.
  • FIGS. 1 through 6 Exemplary embodiments of the present invention will be explained with reference to the following FIGS. 1 through 6 .
  • FIG. 1 shows a plastic suds container in a perspective view.
  • FIG. 2 shows another embodiment of a plastic suds container according to the present invention.
  • FIG. 3 depicts meander-shaped relief profiles.
  • FIG. 4 shows star-shaped relief profiles.
  • FIG. 5 illustrates oval relief profiles
  • FIG. 6 shows spherical relief profiles.
  • FIG. 1 is a perspective view of a plastic suds container 1 for a washing machine.
  • a drum (not shown in detail) is rotatably mounted in plastic suds container 1 .
  • This is a view looking into the interior of a cut-open plastic suds container 1 .
  • Plastic suds container 1 substantially includes a cylindrical shell 2 and at least one end wall 3 .
  • a metallic cross-shaped bearing member 4 including a hub 5 for receiving a drive shaft for the drum is incorporated in the plastic mass. This is shown especially in FIG. 2 .
  • end wall 3 is provided with relief profiles 6 , which are intended to absorb the internal stresses occurring when the plastic shrinks as it cools from its solidification temperature to ambient temperature.
  • End wall 3 has stabilizing means in the form of ribs integrally formed thereon and a cross-shaped bearing member 4 embedded in the plastic mass, said cross-shaped bearing member having a central hub 5 and braces 14 extending radially outwardly from hub 5 .
  • Relief profiles 6 are each located in areas 8 bounded by stabilizing means 14 , 16 and are completely surrounded by the remaining flat wall within these areas 8 .
  • Relief profile 6 has a bulge directed toward the interior of the container and has a curved pattern of limited length in plane 13 of end wall 3 .
  • Arrows 13 indicate, by way of example, just four directions of extension in the plane of end wall 3 . However, these four directions are not intended to have a limiting effect with respect to other directions of extension of relief profiles 6 .
  • FIG. 5 The function of a relief profile 6 is illustrated in FIG. 5 .
  • the cross-sectional view clearly shows the hollow-shaped relief profile 6 .
  • stresses occurring within container wall 3 lead to forces in direction 13 a and further internal forces in opposite direction 13 b.
  • the hollow-shaped bulge of relief profile 6 allows for partial displacement of container wall 3 in the direction of acting forces 13 a and 13 b, whereby the center or apex 9 of relief profile 6 is moved in direction 15 , and the depth of the hollow is reduced.
  • the resulting forced movement or expansion in the direction of extension of plane 13 in the presence of forces 13 a and 13 b permits internal stresses to be reduced or completely removed.
  • FIG. 2 is an elevation view of the end wall showing cross-shaped bearing member 4 embedded in the plastic. Stresses resulting from the different temperature expansion coefficients of metallic cross-shaped bearing member 4 and of the plastic may occur in areas 8 , which are bounded by arms 14 of cross-shaped bearing member 4 .
  • the patterns of the relief profiles 6 are selected such that they cover as extensive an area as possible for any occurring material stresses or force peaks, and that they are capable of absorbing such force peaks by partial deformation within relief profiles 6 .
  • relief profiles 6 which are formed in the injection mold, are shown in greater detail in FIGS. 3, 4 , 5 and 6 .
  • relief profiles 6 may preferably be provided on the end wall 3 of container 2 , in which is incorporated metallic cross-shaped bearing member 4 .
  • Relief profiles 6 can be meander-shaped, as shown in FIG. 3 .
  • relief profile 6 is star-shaped, while FIG. 5 illustrates a suitable variant of a relief profile 6 whose pattern is oval in plane.
  • FIG. 6 shows a spherical relief profile 6 incorporated in-plane.
  • the wall thickness in the area of apex 9 within relief profile 6 is smaller than the wall thickness in the remaining unprofiled area 10 .
  • the wall thickness decreases steadily, whereby in the event of a partial deformation within relief profile 6 , stress peaks are avoided in this transition region 11 . Due to the shape of relief profile 6 and/or the reduction in wall thickness, increased elasticity is provided in this region compared to the remaining area 12 of the container wall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
US11/409,696 2005-04-25 2006-04-24 Plastic suds container for a washing machine Abandoned US20060236729A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005019414.1 2005-04-25
DE102005019414A DE102005019414B3 (de) 2005-04-25 2005-04-25 Kunststofflaugenbehälter für eine Waschmaschine

Publications (1)

Publication Number Publication Date
US20060236729A1 true US20060236729A1 (en) 2006-10-26

Family

ID=36274061

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/409,696 Abandoned US20060236729A1 (en) 2005-04-25 2006-04-24 Plastic suds container for a washing machine

Country Status (5)

Country Link
US (1) US20060236729A1 (fr)
EP (1) EP1717364B1 (fr)
AT (1) ATE443175T1 (fr)
DE (2) DE102005019414B3 (fr)
ES (1) ES2329394T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8505262B2 (en) 2009-03-17 2013-08-13 Pilkington Italia S.P.A. Vehicle glazing having a trim mounted thereon
US20210198831A1 (en) * 2018-12-28 2021-07-01 Whirlpool Corporation Extended tub for a laundry treating appliance

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005054968B3 (de) * 2005-11-16 2006-11-02 Miele & Cie. Kg Kunststofflaugenbehälter für eine Wäschebehandlungsmaschine und Wäschebehandlungsmaschine
DE102006055419B3 (de) * 2006-11-22 2007-12-13 Miele & Cie. Kg Kunststofflaugenbehälter und Verfahren zur Herstellung eines Kunststofflaugenbehälters für eine Waschmaschine
US20110042848A1 (en) * 2009-08-24 2011-02-24 Ash Charles E Method of making a molded trim assembly
DE102009044574B3 (de) * 2009-11-18 2011-02-17 Miele & Cie. Kg Kunststofflaugenbehälter für eine Waschmaschine

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2620070A (en) * 1950-05-03 1952-12-02 Gen Tire & Rubber Co Washing machine tub and spin basket
US3128121A (en) * 1961-10-10 1964-04-07 Woodall Industries Inc Hollow plastic sun visor having deformed areas
US3335903A (en) * 1964-02-28 1967-08-15 Standard Oil Co Plastic tanks
US3572535A (en) * 1969-01-21 1971-03-30 William W Kinzie Collapsible storage container
US3615974A (en) * 1967-07-06 1971-10-26 Graeff Roderich Wilhelm Plate-shaped structural elements filled with expanded material
US3712614A (en) * 1970-07-17 1973-01-23 Cambridge Res & Dev Group Swing seat
US3935358A (en) * 1973-03-29 1976-01-27 E. I. Du Pont De Nemours & Co. Process for preparing a hollow, rib-reinforced laminated structure
US4886180A (en) * 1988-12-09 1989-12-12 Chrysler Motors Corporation Reinforcement for a plastic fuel tank
US5329791A (en) * 1991-11-27 1994-07-19 Zanussi Elettrodomestici S.P.A. Plastic washtub
US5618607A (en) * 1993-10-21 1997-04-08 Sumitomo Chemical Company, Limited Plastic-made reinforced structure
US7418843B2 (en) * 2002-12-10 2008-09-02 Lg Electronics Inc. Drum type washing machine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1289395B1 (it) * 1996-10-08 1998-10-02 Electrolux Zanussi Elettrodome Procedimento perfezionato per lo stampaggio a iniezione di manufatti in materia plastica
IT245289Y1 (it) * 1998-01-20 2002-03-20 Electrolux Zanussi Elettrodome Vasca in plastica perfezionata per macchina lavabiancheriae simili
GB2338543B (en) * 1998-06-18 2002-08-07 Gen Domestic Appliances Ltd Washer dryer
EP2241666B1 (fr) * 2003-10-29 2011-11-23 Miele & Cie. KG Procédé de fabrication d'un groupe de lavage pour une machine à laver avec une cuve en plastique
EP1538252A1 (fr) * 2003-12-01 2005-06-08 Electrolux Home Products Corporation N.V. Cuve en matière plastique pour machine à laver le linge

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2620070A (en) * 1950-05-03 1952-12-02 Gen Tire & Rubber Co Washing machine tub and spin basket
US3128121A (en) * 1961-10-10 1964-04-07 Woodall Industries Inc Hollow plastic sun visor having deformed areas
US3335903A (en) * 1964-02-28 1967-08-15 Standard Oil Co Plastic tanks
US3615974A (en) * 1967-07-06 1971-10-26 Graeff Roderich Wilhelm Plate-shaped structural elements filled with expanded material
US3572535A (en) * 1969-01-21 1971-03-30 William W Kinzie Collapsible storage container
US3712614A (en) * 1970-07-17 1973-01-23 Cambridge Res & Dev Group Swing seat
US3935358A (en) * 1973-03-29 1976-01-27 E. I. Du Pont De Nemours & Co. Process for preparing a hollow, rib-reinforced laminated structure
US4886180A (en) * 1988-12-09 1989-12-12 Chrysler Motors Corporation Reinforcement for a plastic fuel tank
US5329791A (en) * 1991-11-27 1994-07-19 Zanussi Elettrodomestici S.P.A. Plastic washtub
US5618607A (en) * 1993-10-21 1997-04-08 Sumitomo Chemical Company, Limited Plastic-made reinforced structure
US7418843B2 (en) * 2002-12-10 2008-09-02 Lg Electronics Inc. Drum type washing machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8505262B2 (en) 2009-03-17 2013-08-13 Pilkington Italia S.P.A. Vehicle glazing having a trim mounted thereon
US20210198831A1 (en) * 2018-12-28 2021-07-01 Whirlpool Corporation Extended tub for a laundry treating appliance
US11713530B2 (en) * 2018-12-28 2023-08-01 Whirlpool Corporation Extended tub for a laundry treating appliance

Also Published As

Publication number Publication date
DE102005019414B3 (de) 2006-05-18
EP1717364A1 (fr) 2006-11-02
ATE443175T1 (de) 2009-10-15
ES2329394T3 (es) 2009-11-25
EP1717364B1 (fr) 2009-09-16
DE502006004832D1 (de) 2009-10-29

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AS Assignment

Owner name: MIELE & CIE. KG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HOLLENHORST, MATTHIAS;KRATZSCH, ANDREAS;KUKA, THORSTEN;AND OTHERS;REEL/FRAME:018090/0851

Effective date: 20060406

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION