US20080073310A1 - Closure system - Google Patents

Closure system Download PDF

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Publication number
US20080073310A1
US20080073310A1 US11/516,314 US51631406A US2008073310A1 US 20080073310 A1 US20080073310 A1 US 20080073310A1 US 51631406 A US51631406 A US 51631406A US 2008073310 A1 US2008073310 A1 US 2008073310A1
Authority
US
United States
Prior art keywords
container
band
land
closure
closure system
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
US11/516,314
Other languages
English (en)
Inventor
Thomas C. Horton
Patrick E. McCallister
Thomas W. Osip
Marc S. Velmer
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.)
Mead Johnson Nutrition Co
Original Assignee
Bristol Myers Squibb Co
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 Bristol Myers Squibb Co filed Critical Bristol Myers Squibb Co
Priority to US11/516,314 priority Critical patent/US20080073310A1/en
Assigned to BRISTOL-MYERS SQUIBB COMPANY reassignment BRISTOL-MYERS SQUIBB COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OSIP, THOMAS W., HORTON, THOMAS C., MCCALLISTER, PATRICK E., VELMER, MARC S.
Priority to MX2008012562A priority patent/MX2008012562A/es
Priority to PL07783854T priority patent/PL2059451T3/pl
Priority to KR1020097000462A priority patent/KR101413817B1/ko
Priority to ES07783854.8T priority patent/ES2539279T3/es
Priority to EP07783854.8A priority patent/EP2059451B1/en
Priority to CA2653435A priority patent/CA2653435C/en
Priority to PCT/US2007/069096 priority patent/WO2008030640A1/en
Priority to CNA2007800205692A priority patent/CN101460371A/zh
Priority to BRPI0712803-7A priority patent/BRPI0712803A2/pt
Priority to RU2009108000/12A priority patent/RU2435719C2/ru
Priority to TW096126373A priority patent/TWI406792B/zh
Publication of US20080073310A1 publication Critical patent/US20080073310A1/en
Assigned to MJN RESTRUCTURING HOLDCO, INC. reassignment MJN RESTRUCTURING HOLDCO, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRISTOL-MYERS SQUIBB COMPANY
Assigned to MEAD JOHNSON NUTRITION COMPANY reassignment MEAD JOHNSON NUTRITION COMPANY MERGER (SEE DOCUMENT FOR DETAILS). Assignors: MJN RESTRUCTURING HOLDCO, INC.
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D51/00—Closures not otherwise provided for
    • B65D51/14—Rigid discs or spherical members adapted to be held in sealing engagement with mouth of container, e.g. closure plates for preserving jars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D51/00—Closures not otherwise provided for
    • B65D51/14—Rigid discs or spherical members adapted to be held in sealing engagement with mouth of container, e.g. closure plates for preserving jars
    • B65D51/145—Rigid discs or spherical members adapted to be held in sealing engagement with mouth of container, e.g. closure plates for preserving jars by means of an additional element connected directly to the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/62—Secondary protective cap-like outer covers for closure members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D51/00—Closures not otherwise provided for
    • B65D51/18—Arrangements of closures with protective outer cap-like covers or of two or more co-operating closures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D53/00—Sealing or packing elements; Sealings formed by liquid or plastics material
    • B65D53/04—Discs

Definitions

  • the present invention relates generally to closure systems for containers.
  • Container closures are devices that seal the contents of a container, thereby protecting the container contents from contamination, oxygen, moisture, spillage and evaporation.
  • Many types of closure systems have emerged to serve these functions.
  • a two-piece closure system also known as a composite closure, is typically made up of a screw band and a disk.
  • the disk fits inside the band, between the band and the container.
  • the disk often has a peripheral raised bead with an underside adapted to contact the land of the container.
  • the disk may also have an annular ring of heat-sensitive adhesive or sealant disposed on the underside of the peripheral raised bead. This sealant provides a sealing contact between the disk and the land of the container and can prevent lateral movement of the disk.
  • the container is typically filled with a food or beverage product before sealing the closure system.
  • the food or beverage product may be commercially sterile.
  • the closure system can then be applied to the container.
  • the disk is typically placed upon the container to be sealed and a screw band is loosely screwed over the disk onto the finish of the container.
  • the screw band often remains loose enough so that as the container is heated and sterilized, venting of gases may take place under the disk. After heat-processing, the screw band is tightened and the sealed container is cooled. By virtue of the slow cooling of the container and its contents, the pressure within the container is reduced.
  • This type of closure is beneficial because it can maintain product seal integrity during sterilization and allows the container to be resealable by the consumer without the need for a secondary inner seal.
  • the present invention is directed to a novel closure system comprising a container having a finish and a land located at the top of the finish.
  • the outer wall of the finish, just below the land, is vertical and the land slopes downwardly, toward the outside of the container, at an angle of between about 1° and 10°.
  • a band adapted to be received onto the finish of the container.
  • the band has a top portion and an annular lip extending inwardly from the top portion.
  • a disk adapted to be received between the band and the container land.
  • the disk has a raised peripheral bead, the underside of the raised peripheral bead presenting a downwardly facing channel which contains a gasket material.
  • the ratio of the width of the channel to the width of the container land is in the range of about 2:1 to 1:1.
  • FIG. 1 illustrates a cross-sectional view of a closure system of an embodiment of the present invention in which the band is engaged with the disk and container land but not tightened onto the disk and container land.
  • FIG. 2 illustrates an exaggerated cross-sectional view of an embodiment of a closure system of the present invention in which the band is engaged with the disk and container land but not tightened onto the disk and container land.
  • FIG. 3 illustrates an exaggerated cross-sectional view of an embodiment of a closure system of the present invention in which the band is engaged with the disk and container land but not tightened onto the disk and container land.
  • exemplary angles of the land, channel, and top portion of the band are illustrated.
  • FIG. 4 illustrates an exaggerated cross-sectional view of an embodiment of a closure system of the present invention in which the band is tightened onto the disk and container land, forcing the container land into sealing contact with the gasket material.
  • finish means the top portion of a container which surrounds the opening of the container and is configured to accommodate a closure.
  • a finish is shown as 22 in the Figures.
  • land means the lip portion of the finish which makes contact with the gasket material of the disk and forms a seal.
  • a land is shown as 21 in the Figures.
  • skirt refers to the vertical wall of the band, extending downwardly from the top portion of the band. For example, a skirt is shown as 14 in the Figures.
  • raised peripheral bead refer to a raised ring around the circumference of the disk.
  • a raised peripheral bead is shown as 32 in the Figures.
  • gasket material means any type of sealing material that can be placed between the disk and container land in order to prevent the escape of substances such as gas or fluid.
  • a gasket material is shown as 34 in the Figures.
  • the present invention is directed to a novel closure system 10 comprising a container 20 and a closure engageable with that container 20 .
  • the closure of the invention can comprise a two-piece composite closure.
  • a disk 30 fits inside a band 11 , between the band 11 and the container 20 .
  • the band 11 has a top portion 12 , an annular lip 13 extending inwardly from the top portion 12 , and a skirt 14 extending downwardly from the top portion 12 .
  • the disk 30 has a center portion 31 and a raised peripheral bead 32 circumnavigating the center portion 31 .
  • the underside of the bead 32 can present a downwardly facing channel 33 which can contain a gasket material 34 . Under pressure, the gasket material 34 is designed to seal the disk 30 to the container land 21 .
  • the band 11 can be screwed onto the container via annular threads 16 and 23 , located on the outer surface of the container finish 22 and the inner surface of the band skirt 14 , respectively.
  • the annular threads 16 and 23 are adapted to receive one another and provide a tight fit between the band 11 and the container 20 , thereby sealing the gasket material 34 of the disk 30 against the land 21 of the container 20 .
  • the annular threads 16 and 23 are continuous annular threads.
  • a continuous annular thread may be comprised of an uninterrupted protruding helix.
  • the annular threads 16 and 23 are interrupted threads or lugs.
  • a lug thread may be designed so the thread segments are disposed equidistantly around the container finish.
  • the closure has matching portions that engage each of the thread segments.
  • At least one annular bead 40 is present on the upper surface of the top portion 12 of the band 11 .
  • two or three annular beads 40 may be located on the upper surface of the top portion 12 of the band 11 .
  • the annular bead(s) 40 can be rounded, squared, or any other shape.
  • the annular beads provide the band 11 with additional structure and stability during the tightening of the band onto the container. When the band of a typical two-piece closure is screwed onto a container, uneven force may cause the band to flex.
  • the annular beads 40 located on the upper surface of the top portion 12 of the band 11 provide the band with stability and reduce unwanted flexing of the band.
  • the container land 21 slopes downwardly, toward the outside of the container, at an angle A of between about 10 and 100 (shown in FIG. 3 ). In certain embodiments, the container land 21 slopes downwardly, toward the outside of the container, at an angle A of between about 3° and 7°. In still other embodiments, the container land 21 slopes downwardly, toward the outside of the container, at an angle A of about 5° so that the inside edge of the container land is about 5° higher than the outside edge of the container land.
  • the underside 19 of the top portion 12 of the band 11 and the channel 33 can also slope downwardly, toward the outside of the closure system, at angles B and C, respectively, which can correspond generally to the angle A of the container land.
  • the container land 21 , disk channel 33 and top portion 12 each slope downwardly, toward the outside of the container, at an angle of about 5°.
  • the land area has a downwardly sloping angle of about 15°.
  • a nearly flat land area between about 1° and 10°, allows thorough coverage of the gasket material 34 over the container land 21 as the disk 30 is tightened onto the container 20 . Additionally, if the angle of the disk and band corresponds with the angle of the container land, the seal area is further maximized.
  • the container 20 can be extrusion molded and removed from the rotation wheel, with excess plastic remaining on the finish as a moil.
  • This material can then be removed using a rotating knife blade.
  • the knife blade can be set at any angle, for example at 5° below flat surface.
  • the knife blade then separates the container from the moil at a 5° angle. This creates an angle where the inside edge of the container land is slightly higher than the outside edge of the container land.
  • the nearly flat land area places a more even distribution of the gasket material 34 onto the container land 21 .
  • the disk and band can be manufactured to provide corresponding angles.
  • the band 11 has a top-centered opening 18 .
  • the annular lip 13 defines a peripheral edge 17 of a top opening 18 .
  • the disk 30 of the closure system 10 is inserted between the band 11 and the container land 21 . It can be received into the band 11 just below the inwardly extending annular lip 13 of the band 11 .
  • the disk 30 can be rotatably movable within the band 11 .
  • the band 11 can be rotatable while the disk 30 can be frictionally held in place by the gasket material 34 and container land 21 .
  • the disk 30 provides a seal for the container 20 (shown in FIG. 4 ).
  • the gasket material-containing channel 33 is designed to form a seal with the land 21 of the container 20 .
  • the gasket material 34 can be plastisol.
  • Plastisol is a liquid mixture of resins and plasticizers that is solidified with the application of heat.
  • a plastisol-lined disk forms an airtight seal against the container land to prevent the ingress of oxygen or other contaminants.
  • the annular lip 13 of the band 11 when the disk 30 is inserted into the band 11 , the annular lip 13 of the band 11 extends inwardly beyond the raised bead 32 of the disk 30 and has a hook portion 15 that engages the top and inside edge of the bead 32 .
  • the hook portion 15 of the lip 13 applies force downwardly on the top and inner edge of the bead 32 , thereby creating an equal downward force on the top, outer and inner surface of the land 21 of the container.
  • the container land can then create a channel in the gasket material, forcing the gasket material to be distributed evenly across the inside, top and outside of the container land. This provides a better seal for the gasket material on the container land and prevents the ingress or egress of gaseous or liquid substances.
  • the ratio of the width of the channel 33 to the width of the container land 21 is in the range of about 2:1 to 1:1. In particular embodiments the ratio of the width of the channel 33 to the width of the container land 21 is in the range of about 1.75:1 to 1:1. In further embodiments the ratio of the width of the channel 33 to the width of the container land 21 is in the range of about 1.5:1 to 1:1. In yet another embodiment the ratio of the width of the channel 33 to the width of the container land 21 is about 1.48:1. In these embodiments, the width of the channel 33 is slightly larger than the width of the land 21 of the container with which it engages. A relatively narrow channel 33 is beneficial because as the disk 30 is pushed downwardly onto the container land 21 , the coverage area of the gasket material 34 in the channel 33 is thoroughly distributed on the top, inside, and outside of the container land 21 .
  • the outer wall 24 of the container finish 22 is vertical. Oftentimes, the outer wall of the container finish on containers will angle slightly inwardly. This does not provide as a large a contact area for the gasket material seal. Molding the outer wall 24 of the finish 22 as a completely straight vertical wall increases the area of the container land 21 in contact with and covered by the gasket material 34 in the disk 30 . This maximizes the seal contact area and creates a center clamping force by the closure band 11 of equal amount over the top, inside edge and outside edge of the container land 21 .
  • the container 20 of the present invention can be filled with a food or beverage product before sealing the closure system 10 .
  • the closure system 10 can then be applied to the container 20 .
  • the disk 30 can be placed upon the container 20 and the band 11 screwed tightly onto the container 20 .
  • the container 20 can then be heated and sterilized.
  • the closure system 10 of the invention beneficially maintains product seal integrity during sterilization and allows the container 20 to be resealable by the consumer without the need for a secondary inner seal.
  • each of the container, disk and band may each be made of the same material, such as plastic.
  • the container, disk and band may all be made of different materials, such as a glass container, metal disk and plastic band.
  • the container and band may be plastic and the disk may be metal.
  • the band is plastic.
  • the band can be prepared from any plastic material, including one or more selected from the group consisting of polyethylene, polypropylene, polystyrene, cycloolefin copolymer, polyethylene terephthalate, polyethylene naphthalate, ethylene-(vinyl alcohol) copolymer, poly-4-methylpentene-1, poly(methyl methacrylate), acrylonitrile, polyvinyl chloride, polyvinylidene chloride, styrene-acrylonitrile, acrylonitrile-butadiene-styrene, polyamide, polyacetal, polycarbonate, polybutylene terephthalate, ionomer, polysulfone, polytetra-fluoroethylene, polyester, vinyl ester, polyurethane and polyurea.
  • the band is prepared from polypropylene.
  • a plastic band offers advantages in that a plastic band does not rust or corrode and can be reused many times without any deterioration of its appearance.
  • the outside of the skirt may have a plurality of vertical ribs or other gripping mechanisms designed to aid in the grasping and turning of the band.
  • the band can be provided with tamper indicating means.
  • the band can have a detachable ring and, hinged to the detachable ring along its lower end, a series of upwardly and inwardly projecting ratchet fingers or tabs.
  • the band may be injection molded.
  • the disk is metal.
  • the disk is made from stainless steel.
  • the disk can be semi-rigid.
  • the disk can have a central portion sufficiently flexible to be drawn partially inward into the open mouth of the container when the pressure within the container is less than the pressure outside the container. The deflection of the central portion of the disk provides a visual indication of the existence of a hermetic seal.
  • the container of the present invention can be extrusion blow molded and can comprise any suitable plastic material known in the art.
  • the container can be of any size and should be adapted to receive the corresponding two-piece closure system.
  • the container may comprise a jar.
  • the container may comprise a bottle, such as an infant or baby bottle.
  • the bottle may be filled with cow's milk, human breast milk or infant formula. Once the closure of the present invention is applied to the bottle, the system may be sterilized or otherwise processed.
  • the bottle may be filled and the disk of the system replaced with a nipple.
  • the band can then be tightened onto the nipple and container, securing the nipple in place.
  • the container and closure system can then be used to feed an infant.
  • the closure system of the present invention is suitable for multiple filling processes, including hot fill, cold fill, dry seal, pasteurization and retort.
  • the closure can be produced in a variety of sizes for a wide range of food and beverage applications, such as pickled products, sauces, jams, jellies, nuts, juices, milk-based beverages, and infant formulas.
  • the disk and band may be made of different colors improving the esthetics of the product package. Additionally, the disk and/or band may be produced in a manner so that they can be labeled for commercial purposes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Sealing Of Jars (AREA)
US11/516,314 2006-09-06 2006-09-06 Closure system Abandoned US20080073310A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US11/516,314 US20080073310A1 (en) 2006-09-06 2006-09-06 Closure system
RU2009108000/12A RU2435719C2 (ru) 2006-09-06 2007-05-17 Укупорочная система
CA2653435A CA2653435C (en) 2006-09-06 2007-05-17 Closure system
CNA2007800205692A CN101460371A (zh) 2006-09-06 2007-05-17 封闭系统
KR1020097000462A KR101413817B1 (ko) 2006-09-06 2007-05-17 밀폐장치 시스템
ES07783854.8T ES2539279T3 (es) 2006-09-06 2007-05-17 Sistema de cierre
EP07783854.8A EP2059451B1 (en) 2006-09-06 2007-05-17 Closure system
MX2008012562A MX2008012562A (es) 2006-09-06 2007-05-17 Sistema de cierre.
PCT/US2007/069096 WO2008030640A1 (en) 2006-09-06 2007-05-17 Closure system
PL07783854T PL2059451T3 (pl) 2006-09-06 2007-05-17 System zamykania
BRPI0712803-7A BRPI0712803A2 (pt) 2006-09-06 2007-05-17 sistema de fechamento
TW096126373A TWI406792B (zh) 2006-09-06 2007-07-19 蓋合系統

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/516,314 US20080073310A1 (en) 2006-09-06 2006-09-06 Closure system

Publications (1)

Publication Number Publication Date
US20080073310A1 true US20080073310A1 (en) 2008-03-27

Family

ID=38566923

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/516,314 Abandoned US20080073310A1 (en) 2006-09-06 2006-09-06 Closure system

Country Status (12)

Country Link
US (1) US20080073310A1 (es)
EP (1) EP2059451B1 (es)
KR (1) KR101413817B1 (es)
CN (1) CN101460371A (es)
BR (1) BRPI0712803A2 (es)
CA (1) CA2653435C (es)
ES (1) ES2539279T3 (es)
MX (1) MX2008012562A (es)
PL (1) PL2059451T3 (es)
RU (1) RU2435719C2 (es)
TW (1) TWI406792B (es)
WO (1) WO2008030640A1 (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8544666B2 (en) 2010-09-20 2013-10-01 Mead Johnson Nutrition Company Tamper-evident container system
US20190031410A1 (en) * 2017-07-26 2019-01-31 Erik Vazquez Markable Bottle Cap
US11338970B2 (en) * 2009-05-29 2022-05-24 Crown Packaging Technology, Inc. Closure assembly

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140027456A1 (en) * 2012-07-26 2014-01-30 Dedoes Industries, Inc. Lid for a can with an improved seal
KR101450574B1 (ko) * 2013-07-17 2014-10-15 이기준 음식물 저장용기
CN103466186B (zh) * 2013-09-17 2016-04-27 贵州千叶塑胶有限公司 密封瓶盖
US10351309B2 (en) * 2015-09-16 2019-07-16 Owens-Brockway Glass Container Inc. Vacuum release seal for a closure and container package
RU167480U1 (ru) * 2016-07-18 2017-01-10 Иностранное производственное унитарное предприятие "АЛКОПАК" Венчик горловины бутылки
GB201809831D0 (en) * 2018-06-15 2018-08-01 Douwe Egberts Bv Container lids and methods of manufacturing the same

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US11338970B2 (en) * 2009-05-29 2022-05-24 Crown Packaging Technology, Inc. Closure assembly
US8544666B2 (en) 2010-09-20 2013-10-01 Mead Johnson Nutrition Company Tamper-evident container system
US20190031410A1 (en) * 2017-07-26 2019-01-31 Erik Vazquez Markable Bottle Cap

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CA2653435A1 (en) 2008-03-13
CN101460371A (zh) 2009-06-17
RU2009108000A (ru) 2010-10-20
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ES2539279T3 (es) 2015-06-29
EP2059451A1 (en) 2009-05-20
KR101413817B1 (ko) 2014-06-30
PL2059451T3 (pl) 2015-09-30
EP2059451B1 (en) 2015-04-08
MX2008012562A (es) 2008-10-10
CA2653435C (en) 2014-09-30
KR20090060258A (ko) 2009-06-11
BRPI0712803A2 (pt) 2012-10-23
TWI406792B (zh) 2013-09-01
WO2008030640A1 (en) 2008-03-13

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