US20090162463A1 - Tire mold - Google Patents
Tire mold Download PDFInfo
- Publication number
- US20090162463A1 US20090162463A1 US12/259,521 US25952108A US2009162463A1 US 20090162463 A1 US20090162463 A1 US 20090162463A1 US 25952108 A US25952108 A US 25952108A US 2009162463 A1 US2009162463 A1 US 2009162463A1
- Authority
- US
- United States
- Prior art keywords
- mold
- segments
- fluid
- segment
- tire
- 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.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
- B29D30/0606—Vulcanising moulds not integral with vulcanising presses
- B29D30/0629—Vulcanising moulds not integral with vulcanising presses with radially movable sectors
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
- B29C33/04—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
Definitions
- the present invention relates to a mold for a pneumatic radial tire, and more particularly, to a segmented tire mold.
- Tire molds for molding pneumatic tires are typically constructed of steel or aluminum, and heated by steam platens or by placing the molds in potheaters.
- Thermal conduction is usually relied upon to transfer the heat from the heat source to the tread and sidewall forming surfaces. It is desirable to maximize the heat conduction to the tread and sidewall forming surfaces. If the thermal conduction is less than optimum, it will require additional cure time and energy costs resulting in reduced production capacity for the mold and higher operating costs. Inefficient thermal conduction can also result in temperature non-uniformity in the mold.
- the time to cure a tire is limited by the point of least cure on the tire, which is typically located on the undertread or in the bead area. Thus if this area could be cured quicker, the entire time of the process may be reduced. Thus an improved mold is desired which can heat the tire more quickly, uniformly and efficiently.
- the invention provides in a first aspect a segmented mold comprising a plurality of segments arranged to form an annular cavity to mold a tire, the segments comprising an inner face for molding the tread, and an outer radial surface; the mold further comprising a plurality of slide blocks located radially outwards of the segments; wherein or more channels are provided between each segment outer surface and the adjacent slide block inner surface forming a fluid passageway, wherein each fluid passageway is joined together by a fluid connector to form a fluid manifold for circulating a fluid medium.
- the invention provides in a second embodiment a segmented mold comprising a plurality of segments arranged to form an annular cavity to mold a tire, the segments comprising an inner face for molding the tread, and an outer radial surface; the mold further comprising a plurality of slide blocks located radially outwards of the segments; wherein or more fluid passageways are provided internally within each segment, wherein each fluid passageway is joined together by a fluid connector to form a fluid manifold for circulating a fluid medium.
- FIG. 1 is a partial cutaway view of a segmented mold assembly showing only the segments, sidewall plates and mold rings;
- FIG. 2 is a partial cutaway view of the mold assembly of FIG. 1 additionally showing the outer container parts.
- FIG. 3 is a perspective view of the entire mold assembly shown in the closed position
- FIG. 4 is a perspective view of the entire assembly of FIG. 3 , shown in the open position;
- FIG. 5 is a cross-sectional view of a segment and slide block
- FIG. 6 is a rear view of two segments showing the channels
- FIG. 7 is a rear view of a plurality of the slide blocks in the open position.
- Axial and “axially” means the lines or directions that are parallel to the axis of rotation of the tire or tire mold.
- “Circumferential” means lines or directions extending along the perimeter of the surface of the annular tread mold perpendicular to the axial direction.
- Ring and radially mean directions radially toward or away from the axis of rotation of the tire or tire mold.
- “Sidewall” means a portion of a tire between the tread and the bead.
- FIG. 1 illustrates a first embodiment of a mold assembly 10 of the present invention.
- the mold assembly 10 comprises a plurality of segments 12 which are arranged to form an annular ring when assembled together.
- the outer tread surface of a tire is formed by the inner molding surface 14 of the segments 12 , which have a plurality of lands and grooves to mold the tread pattern in a green tire.
- the mold segments 12 may be radially movable to allow assembly and disassembly of the mold about a green tire.
- the mold assembly 10 further comprises a first and second sidewall plate 20 , 22 for molding the sidewalls of the tire (not shown).
- Each sidewall plate 20 , 22 has an inner mold surface 24 , 26 for molding the tire sidewall, and joins with the segments 12 to form a smooth continuous surface from the tire tread to the sidewall.
- Each sidewall plate 20 , 22 may comprise an optional radially outer lip 28 , 30 forming an L shaped recess for receiving a first and second flanged end 32 , 34 of the segment therein.
- Each sidewall plate 20 , 22 further comprises an optional radially inner extension or lip forming a second L shaped recess 36 , 38 for receiving a mold bead ring 40 , 42 therein.
- Each bead ring 40 , 42 has a radiused portion 44 , 46 for receiving a bead area of a green tire thereon.
- the upper and lower sidewall plate 20 , 22 together with the plurality of tread segments 12 and the top and bottom bead rings 40 , 42 cooperate to define a mold cavity for molding a green tire.
- the mold assembly 10 is typically housed in an optional container housing 70 as shown in FIG. 2 .
- the container 70 typically includes a top and bottom container plate 49 , 50 having a plurality of optional wear plates 52 thereon.
- the bottom container plate 50 has an inner annulus 54 for supporting the sidewall plate 22 and bead ring 42 thereon as shown in FIG. 2 .
- the segments 12 are shown positioned about the sidewall plate 22 .
- Surrounding the segments 12 are a plurality of slide blocks 60 .
- the slide blocks 60 have flanged ends 62 , 64 for receiving and supporting the segments 12 therein.
- the slide blocks 60 have a top and a bottom surface 63 , 65 for contacting the container plates 49 , 50 and wear plates 52 .
- the slide blocks 60 are slidable in a radial direction.
- the container housing further comprises an annular actuating ring 70 .
- the inner radial surface 72 of the actuating ring 70 is angled for engagement with an outer angled surface 74 of slide blocks 60 .
- the inner surface 72 of the actuating ring engages the outer surface 74 of slide blocks, causing the slide blocks to slide radially inward.
- the camming action of the actuator ring 70 moves the slide blocks 60 radially inward.
- the radially inner surface 76 of the slide block engages the outer surface 78 of the adjacent segment, moving the segment radially inward as the actuating ring is lowered into position.
- FIG. 5 illustrates a cross-sectional view of a tread mold segment 12 and the slide block 60 of the present invention.
- the mold segment 12 may be further subdivided into two components: a radially inner portion 12 a and a radially outer portion 12 b.
- the radially inner portion 12 a has a radially inner mold surface 14 for forming the tread lands and grooves, and an outer surface 82 having flanged projections 84 .
- the radially outer portion 12 b has a radially inner surface 80 that mates with the radially outer surface 82 of the segment inner portion 12 a. As shown in FIG.
- the radially outer portion 12 b has a radially outer surface 78 further comprising one or more channels 84 (hereinafter “channel”).
- the channel 84 cooperates with the inner surface 76 of the slide block 60 to form an enclosed fluid passageway.
- the fluid passageway has a first end 86 and a second end 88 which may function to be an inlet or outlet to the fluid passageway.
- the channel as shown in FIG. 6 extends in a first axial direction from an axially outer end 89 to an axially inner end 91 , and then extends in a second, radial direction and then back in a third, axial direction from the axially inner end 91 to the axially outer end 91 .
- the channel may also traverse the segment from one end 89 to the other 91 in a zigzag or labyrinth manner, or in any pattern as desired.
- the segments 12 a, b may also comprise a unitary piece with the one or more channels located on the outer surface 78 or located within the interior of the segment 12 (not shown).
- Each fluid passageway in a segment 12 which are formed by the one or more channels 84 are connected together with fluid passageways of adjacent segments 12 with a flexible connector 100 .
- the connector has a first and second end 102 , 104 that are received in bores 103 , 105 of slide block 60 .
- the first end 102 of the connector 100 is connected to the outlet port 88 of a first segment channel and the second end 104 of the connector connects to the inlet port of an adjacent, second segment channel.
- the connector 100 comprises flexible tubing which is more preferably insulated.
- the flexible tubing is sized to have a sufficient length to allow the segments to move apart as shown in FIG. 4 .
- Stainless steel braided tubing is one example which may be utilized for the invention.
- Container 70 has slots 110 aligned to receive the connectors therein so that the tubing is not bent when closing the mold assembly.
- the interconnected fluid passageways are in fluid communication with each other, forming a fluid manifold.
- the fluid manifold has an inlet and an outlet (not shown). Steam or other fluid medium may be circulated at the desired temperature in order to heat or cool the mold segments.
- the invention reduces the thermal energy required during tire vulcanization by reducing the cycle time form warmup and cool down cycle.
- the invention provides this benefit by providing the heat source to the tread segments.
- the slide blocks can be made of cheaper materials such as ceramic or plastic instead of steel as there is no need for thermal conductivity between the actuating ring and the slide blocks.
Abstract
Description
- This application claims the benefit of, and incorporates by reference, U.S. Provisional Application No. 61/015,369 filed Dec. 20, 2007.
- The present invention relates to a mold for a pneumatic radial tire, and more particularly, to a segmented tire mold.
- Tire molds for molding pneumatic tires are typically constructed of steel or aluminum, and heated by steam platens or by placing the molds in potheaters. Thermal conduction is usually relied upon to transfer the heat from the heat source to the tread and sidewall forming surfaces. It is desirable to maximize the heat conduction to the tread and sidewall forming surfaces. If the thermal conduction is less than optimum, it will require additional cure time and energy costs resulting in reduced production capacity for the mold and higher operating costs. Inefficient thermal conduction can also result in temperature non-uniformity in the mold. The time to cure a tire is limited by the point of least cure on the tire, which is typically located on the undertread or in the bead area. Thus if this area could be cured quicker, the entire time of the process may be reduced. Thus an improved mold is desired which can heat the tire more quickly, uniformly and efficiently.
- The invention provides in a first aspect a segmented mold comprising a plurality of segments arranged to form an annular cavity to mold a tire, the segments comprising an inner face for molding the tread, and an outer radial surface; the mold further comprising a plurality of slide blocks located radially outwards of the segments; wherein or more channels are provided between each segment outer surface and the adjacent slide block inner surface forming a fluid passageway, wherein each fluid passageway is joined together by a fluid connector to form a fluid manifold for circulating a fluid medium.
- The invention provides in a second embodiment a segmented mold comprising a plurality of segments arranged to form an annular cavity to mold a tire, the segments comprising an inner face for molding the tread, and an outer radial surface; the mold further comprising a plurality of slide blocks located radially outwards of the segments; wherein or more fluid passageways are provided internally within each segment, wherein each fluid passageway is joined together by a fluid connector to form a fluid manifold for circulating a fluid medium.
- The invention will be described by way of example and with reference to the accompanying drawings in which:
-
FIG. 1 is a partial cutaway view of a segmented mold assembly showing only the segments, sidewall plates and mold rings; -
FIG. 2 is a partial cutaway view of the mold assembly ofFIG. 1 additionally showing the outer container parts. -
FIG. 3 is a perspective view of the entire mold assembly shown in the closed position; -
FIG. 4 is a perspective view of the entire assembly ofFIG. 3 , shown in the open position; -
FIG. 5 is a cross-sectional view of a segment and slide block; -
FIG. 6 is a rear view of two segments showing the channels; -
FIG. 7 is a rear view of a plurality of the slide blocks in the open position. - “Axial” and “axially” means the lines or directions that are parallel to the axis of rotation of the tire or tire mold.
- “Circumferential” means lines or directions extending along the perimeter of the surface of the annular tread mold perpendicular to the axial direction.
- “Radial” and “radially” mean directions radially toward or away from the axis of rotation of the tire or tire mold.
- “Sidewall” means a portion of a tire between the tread and the bead.
-
FIG. 1 illustrates a first embodiment of amold assembly 10 of the present invention. Themold assembly 10 comprises a plurality ofsegments 12 which are arranged to form an annular ring when assembled together. The outer tread surface of a tire is formed by theinner molding surface 14 of thesegments 12, which have a plurality of lands and grooves to mold the tread pattern in a green tire. Themold segments 12 may be radially movable to allow assembly and disassembly of the mold about a green tire. - The
mold assembly 10 further comprises a first andsecond sidewall plate sidewall plate inner mold surface segments 12 to form a smooth continuous surface from the tire tread to the sidewall. Eachsidewall plate outer lip end sidewall plate recess mold bead ring bead ring radiused portion lower sidewall plate tread segments 12 and the top andbottom bead rings - The
mold assembly 10 is typically housed in anoptional container housing 70 as shown inFIG. 2 . Thecontainer 70 typically includes a top andbottom container plate optional wear plates 52 thereon. Thebottom container plate 50 has aninner annulus 54 for supporting thesidewall plate 22 andbead ring 42 thereon as shown inFIG. 2 . Thesegments 12 are shown positioned about thesidewall plate 22. Surrounding thesegments 12 are a plurality ofslide blocks 60. Theslide blocks 60 have flangedends segments 12 therein. Theslide blocks 60 have a top and abottom surface container plates wear plates 52. Theslide blocks 60 are slidable in a radial direction. The container housing further comprises an annular actuatingring 70. The innerradial surface 72 of the actuatingring 70 is angled for engagement with an outerangled surface 74 ofslide blocks 60. As the actuatingring 70 is lowered, theinner surface 72 of the actuating ring engages theouter surface 74 of slide blocks, causing the slide blocks to slide radially inward. The camming action of theactuator ring 70 moves theslide blocks 60 radially inward. As the slide blocks move radially inward, the radiallyinner surface 76 of the slide block engages theouter surface 78 of the adjacent segment, moving the segment radially inward as the actuating ring is lowered into position. -
FIG. 5 illustrates a cross-sectional view of atread mold segment 12 and theslide block 60 of the present invention. Themold segment 12 may be further subdivided into two components: a radiallyinner portion 12 a and a radiallyouter portion 12 b. The radiallyinner portion 12 a has a radiallyinner mold surface 14 for forming the tread lands and grooves, and anouter surface 82 having flangedprojections 84. The radiallyouter portion 12 b has a radiallyinner surface 80 that mates with the radiallyouter surface 82 of the segmentinner portion 12 a. As shown inFIG. 6 , the radiallyouter portion 12 b has a radiallyouter surface 78 further comprising one or more channels 84 (hereinafter “channel”). Thechannel 84 cooperates with theinner surface 76 of theslide block 60 to form an enclosed fluid passageway. The fluid passageway has afirst end 86 and asecond end 88 which may function to be an inlet or outlet to the fluid passageway. The channel as shown inFIG. 6 , extends in a first axial direction from an axiallyouter end 89 to an axiallyinner end 91, and then extends in a second, radial direction and then back in a third, axial direction from the axiallyinner end 91 to the axiallyouter end 91. Alternatively, there may be more than one channel. The channel may also traverse the segment from oneend 89 to the other 91 in a zigzag or labyrinth manner, or in any pattern as desired. Thesegments 12 a, b may also comprise a unitary piece with the one or more channels located on theouter surface 78 or located within the interior of the segment 12 (not shown). - Each fluid passageway in a
segment 12 which are formed by the one ormore channels 84 are connected together with fluid passageways ofadjacent segments 12 with aflexible connector 100. The connector has a first andsecond end bores slide block 60. Thefirst end 102 of theconnector 100 is connected to theoutlet port 88 of a first segment channel and thesecond end 104 of the connector connects to the inlet port of an adjacent, second segment channel. Preferably theconnector 100 comprises flexible tubing which is more preferably insulated. The flexible tubing is sized to have a sufficient length to allow the segments to move apart as shown inFIG. 4 . Stainless steel braided tubing is one example which may be utilized for the invention.Container 70 hasslots 110 aligned to receive the connectors therein so that the tubing is not bent when closing the mold assembly. - The interconnected fluid passageways are in fluid communication with each other, forming a fluid manifold. The fluid manifold has an inlet and an outlet (not shown). Steam or other fluid medium may be circulated at the desired temperature in order to heat or cool the mold segments.
- The invention reduces the thermal energy required during tire vulcanization by reducing the cycle time form warmup and cool down cycle. The invention provides this benefit by providing the heat source to the tread segments. As a result of bringing the heat source nearest the segments, the slide blocks can be made of cheaper materials such as ceramic or plastic instead of steel as there is no need for thermal conductivity between the actuating ring and the slide blocks.
- While a certain representative embodiment and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit or scope of the invention.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/259,521 US7540730B1 (en) | 2007-12-20 | 2008-10-28 | Tire mold |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1536907P | 2007-12-20 | 2007-12-20 | |
US12/259,521 US7540730B1 (en) | 2007-12-20 | 2008-10-28 | Tire mold |
Publications (2)
Publication Number | Publication Date |
---|---|
US7540730B1 US7540730B1 (en) | 2009-06-02 |
US20090162463A1 true US20090162463A1 (en) | 2009-06-25 |
Family
ID=40379835
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/259,521 Expired - Fee Related US7540730B1 (en) | 2007-12-20 | 2008-10-28 | Tire mold |
Country Status (6)
Country | Link |
---|---|
US (1) | US7540730B1 (en) |
EP (1) | EP2072234B1 (en) |
JP (1) | JP2009149078A (en) |
KR (1) | KR20090067087A (en) |
CN (1) | CN101462322B (en) |
BR (1) | BRPI0805372A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102022100504A1 (en) | 2022-01-11 | 2023-07-13 | Arntz Beteiligungs Gmbh & Co. Kg | Device and method for producing at least one drive belt |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2929878B1 (en) * | 2008-04-11 | 2010-06-11 | Michelin Soc Tech | VULCANIZATION MOLD OF A TIRE, INSTALLATION AND METHOD FOR THERMAL REGULATION OF THE MOLD |
JP4814362B2 (en) * | 2009-08-17 | 2011-11-16 | 住友ゴム工業株式会社 | Mold for tire |
CN102990814B (en) * | 2012-12-04 | 2014-12-17 | 云南震安减震技术有限公司 | Assembling mould of shock-isolation rubber bearing |
JP5913266B2 (en) * | 2013-11-27 | 2016-04-27 | 住友ゴム工業株式会社 | Tire manufacturing method |
JP6253516B2 (en) * | 2014-05-27 | 2017-12-27 | 株式会社ブリヂストン | Tire mold |
DE202014007191U1 (en) * | 2014-09-09 | 2014-09-29 | Klaus-Dieter Nies | Device for isolating a container containing a tire mold or vulcanizing mold |
US10766215B2 (en) | 2016-01-21 | 2020-09-08 | Bridgestone Americas Tire Operations, Llc | Adjustable tire mold |
FI129386B (en) * | 2016-02-12 | 2022-01-31 | Wd Racing Oy | Vulcanisation apparatus for vehicle tyres |
CN108000913B (en) * | 2017-12-29 | 2020-06-05 | 山东豪迈机械科技股份有限公司 | Segmented heating tire mold |
US10821688B2 (en) | 2018-12-20 | 2020-11-03 | The Goodyear Tire & Rubber Company | Tire clamping device |
JP2020179562A (en) * | 2019-04-24 | 2020-11-05 | 住友ゴム工業株式会社 | Tire vulcanizer |
US20230061660A1 (en) | 2021-08-26 | 2023-03-02 | The Goodyear Tire & Rubber Company | Mold segment and segmented tire mold with fluid-permeable infill |
CN116728859B (en) * | 2023-08-14 | 2023-12-26 | 山东力创模具股份有限公司 | Tire mold, and cooling system and method thereof |
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2008
- 2008-10-28 US US12/259,521 patent/US7540730B1/en not_active Expired - Fee Related
- 2008-12-09 EP EP08171060A patent/EP2072234B1/en not_active Expired - Fee Related
- 2008-12-16 BR BRPI0805372-3A patent/BRPI0805372A2/en not_active IP Right Cessation
- 2008-12-18 JP JP2008321875A patent/JP2009149078A/en active Pending
- 2008-12-18 KR KR1020080129439A patent/KR20090067087A/en not_active Application Discontinuation
- 2008-12-19 CN CN200810183987XA patent/CN101462322B/en not_active Expired - Fee Related
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102022100504A1 (en) | 2022-01-11 | 2023-07-13 | Arntz Beteiligungs Gmbh & Co. Kg | Device and method for producing at least one drive belt |
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CN101462322B (en) | 2012-06-27 |
CN101462322A (en) | 2009-06-24 |
JP2009149078A (en) | 2009-07-09 |
EP2072234A1 (en) | 2009-06-24 |
BRPI0805372A2 (en) | 2009-08-18 |
US7540730B1 (en) | 2009-06-02 |
EP2072234B1 (en) | 2011-06-22 |
KR20090067087A (en) | 2009-06-24 |
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