EP1954509A2 - Dispositif pour tailler les crayons - Google Patents

Dispositif pour tailler les crayons

Info

Publication number
EP1954509A2
EP1954509A2 EP06839775A EP06839775A EP1954509A2 EP 1954509 A2 EP1954509 A2 EP 1954509A2 EP 06839775 A EP06839775 A EP 06839775A EP 06839775 A EP06839775 A EP 06839775A EP 1954509 A2 EP1954509 A2 EP 1954509A2
Authority
EP
European Patent Office
Prior art keywords
blade
coating
percent
weight
pencil
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.)
Withdrawn
Application number
EP06839775A
Other languages
German (de)
English (en)
Inventor
Walter Johnsen
Michael E. Peterson
Stuart David Farnworth
Larry Buchtmann
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.)
Acme United Corp
Original Assignee
Acme United Corp
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 Acme United Corp filed Critical Acme United Corp
Publication of EP1954509A2 publication Critical patent/EP1954509A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L23/00—Sharpeners for pencils or leads
    • B43L23/008—Sharpeners for pencils or leads with rotating cutting bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L23/00—Sharpeners for pencils or leads
    • B43L23/02—Sharpeners for pencils or leads with gearing
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/0641—Nitrides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/34—Sputtering
    • C23C14/3464—Sputtering using more than one target

Definitions

  • the present invention generally relates to writing instrument sharpening devices.
  • the present invention relates to pencil sharpening devices having a coated blade.
  • electric pencil sharpeners have a sharpening assembly including a rotary mechanism, which is rotated by a motor and cutter mechanism, which is operated by the rotary mechanism.
  • the rotary mechanism and cutter mechanism typically rotate in relatively opposite direction.
  • Most pencil sharpeners carry a cutting blade or plurality of cutting blades on the rotary mechanism.
  • Blades in pencil sharpeners are typically used to sharpen pencils with varying hardness.
  • the combination of graphite, wood, and composite materials in pencils wear down the pencil sharpener blades resulting in increasingly dull blades and increased blade surface roughness through normal use.
  • Pencil sharpeners are also often manipulated by young users who may knowingly or unknowingly damage the sharpener by inserting into the pencil-receiving aperture inappropriate objects that are much harder than pencils, such as pens, paperclips and mechanical pencils.
  • the surface roughness and sharpness of the blades may be negatively affected by the insertion of such inappropriate objects. Dulled blades and increased surface roughness often result in deleterious effects to the writing instruments being sharpened.
  • the smoothness of the cut, sharpness of the pencil tip and uniformity of the cut may be deleteriously affected.
  • Pencil shavings and graphite particles often adhere more so to the surface of pencil sharpener blades that have been dulled and have greater surface roughness.
  • pencil sharpeners are heavily used mechanical devices, especially in schooling and drafting environments. Over time, as in the case with most heavily used mechanical devices, the mechanical elements of pencil sharpeners become worn.
  • a pencil sharpener it would be desirable for a pencil sharpener to have a blade with increased durability to regular and inappropriate use. It would be further desirable for a pencil sharpener to have a blade that would stay sharper longer while deterring the adherence of pencil shavings and graphite particles to the blade surface. It would be further desirable for a pencil sharpening blade to resist an increase in surface roughness through normal and abnormal use.
  • the present invention generally provides a pencil sharpening device with a cutting blade that has a cutting edge.
  • a coating is disposed on the cutting blade, in which the coating has about 35 percent by weight of titanium nitride and about
  • the invention generally provides a pencil sharpening device with a cutting blade that has a cutting edge.
  • a coating is disposed on the cutting blade, in which the coating has about 35 percent by weight of titanium nitride and about 65 percent by weight of chromium nitride.
  • the coating has a thickness in a range between about 0.3 and 0.5 microns, and a hardness in a range between about 5.7 to about 9.1 gigapascals.
  • the present invention generally provides a method for coating a pencil sharpening blade.
  • the blade is placed within a coating chamber and then it is cleaned. After cleaning, a coating is deposited on the pencil sharpening blade.
  • the coating has a range of about 25 to 50 percent by weight titanium nitride and a range of about 50 to 75 percent by weight chromium nitride.
  • the present invention generally provides a pencil-sharpening device with a cutting blade that has a cutting edge.
  • a coating is disposed on the cutting blade, in which the coating provides the blade with a satin silver appearance.
  • Figure 1 is a perspective view of the pencil-sharpening device, according to one embodiment of the invention.
  • Figure 2 is a top plan view of the pencil-sharpening device of Figurel.
  • Figure 3 is an exploded view of the pencil-sharpening device of Figure 1.
  • Figure 4 is a cross-sectional view taken along line 4-4 of Figure 2.
  • Figure 5 is an enlarged perspective view of a pencil-sharpening device blade, according to one embodiment of the invention.
  • Figure 6 is a cross-sectional view of the pencil-sharpening device blade taken along line 6-6 of Figure 5.
  • Figure 7 is a partial exploded view of the pencil-sharpening assembly of
  • FIG 4 the assembly is shown with a pencil inserted in the device.
  • the device 10 is an electrical pencil sharpener that has a base 12, a housing assembly 14, a blade assembly 16, an assembly spacer 18, and power cord 20.
  • the device 10 is repositionable based upon the needs of the user and may use a portable power source (not shown) rather than a power cord 20 tethered to a suitable electrical outlet (not shown).
  • the embodiment of the device 10 as shown is preferably positioned upon a level surface 22 (See Figure 4).
  • a suitable mounting apparatus (not shown) may be used for mounting the device 10 to a surface 22 that is not level.
  • the base 12 of the device 10 has a base structure 24, a motor assembly 26, a motor assembly base 28, and a housing spacer 30.
  • the base structure 24 has any desired shape, for example, the conical shape shown and may be composed a semi-conical shape and is composed of a durable and light-weight material such as plastic. Disposed upon an exterior surface 32 of the base structure 24 are two semi-pyramidal-shaped extensions 34. The extensions 34 provide three additional gripping surfaces 36 and edges 38 that aid in the repositioning of the device 10. In addition to the extensions 34 the base structure 24 has a base overlay 40. An aperture is formed in the base 12 and defined by an edge 39. [0023] The motor assembly 26 is secured firmly to the motor assembly base 28.
  • the motor assembly 26 houses an electric motor (not shown) that actuates a shaft 42 of the blade assembly 16. Any low-power electric motor that rotatably actuates a shaft would be suitable for use in the present invention.
  • the housing spacer 30 is a substantially circular piece of molded plastic having an aperture defining edge 44. The spacer 30 provides a means for spacing and connecting the base 12 to the housing assembly 14.
  • the housing assembly 14 has a receptacle 46, a housing cover 48 and a pencil guide 50.
  • the receptacle 46 is vertically spaced above the base 12 and spacer 30.
  • the receptacle 46 has a pencil-shaving receiving chamber 52, an exterior wall 54, an interior wall 56 (see Figure 4), and an edge 58.
  • the chamber 52 is defined by an exterior wall 54 and an interior wall 56.
  • the chamber 52 continuously extends around the interior wall 56.
  • Interior wall 56 has a height less than the exterior wall 54 so as to expose the blade assembly in order to allow shavings to enter chamber 52.
  • Wall 56 should be as high as possible in order to create the largest holding space for the pencil shavings while still permitting substantially all shavings to exit the blade assembly and 16 and be captured by the receptacle 46.
  • the edge 58 defines an aperture 60 in the receptacle 46.
  • the receptacle 46 may be made from a variety of light-weight materials.
  • a translucent plastic material is preferred for cosmetic reasons, which include a visible coated blade 78.
  • a translucent receptacle 46 also allows the consumer to know when the sharpening-device 10 needs to be emptied.
  • the housing cover 48 is semi-saucer shaped and has a sloping surface 62 extending downward from an aperture defining edge 64 to an exterior edge 66. Any other shape suitable to the physical and aesthetic design of the device 10 may be used for a cover 48.
  • the cover 48 is preferably made from a light-weight material such as plastic.
  • the cover 48 may also be a translucent plastic material.
  • a pencil guide 50 Securably attached to the cover 48 is a pencil guide 50.
  • the pencil guide 50 Securably attached to the cover 48 is a pencil guide 50.
  • the guide 50 is a circular-shaped insert for providing a guiding means to pencils 68 (See Figure 7) as the user inserts them into the device 10.
  • the guide 50 has an exterior edge 70, a pencil-guiding aperture 72 defined by an edge 74, and a recessed surface 76. The guide is positioned such that the guide edge 70 and cover edge 64 are in direct contact with each other.
  • the blade assembly 16 has a blade 78, pencil guide edge 80, a pencil support 82, rotation gearing (not shown) and a first and second blade assembly support 84, 86.
  • the blade 78 is positioned with respect to the blade assembly by a blade shaft 88.
  • the blade 78 has a coating 90, which is metallurgically bonded to the underlying blade substrate 92.
  • Blade 78 has a plurality of spiral cutting surfaces 94 formed along the longitudinal periphery of the blade.
  • the long axis of the blade 78 is positioned at an angle with respect to the longitudinal sharpening axis, formed from the shaft 42, about which the blade assembly 16 rotates in a manner such that the blade 78 turns about its own axis counter-rotatively with respect to the blade assembly 16 as the blade rotates about its own axis.
  • the axis of the blade is formed by the shaft 88.
  • the spiral shaped blade 78 is not intended to be a limiting factor, but it is also conceived that alternative embodiments may employ a conical blade, a flat blade, or a pair of blades.
  • the shall 42 is in communication with both the assembly 16 and blade shaft 88 through gearing (not shown). Rotation of the blade assembly 16 and blade 78 can be performed by various known rotation means.
  • the pencil guide edge 80 defines an aperture through which the pencil 68 is inserted when the user intends the pencil 68 to be sharpened.
  • the guide edge 80 and edge 74 (See Figure 3) are substantially the same dimensions, defining substantially the same size apertures through which the pencil 68 is inserted.
  • the edges 74, 80 work in concert as a pencil 68 positioning support along with pencil support 82.
  • Pencil support 82 is a columnular-shaped and extends from first support 84 to second support 86. Support 82 also provides support to the blade assembly 16. Edges 74, 80 and support 82 are disposed in a manner to provide support to an inserted pencil 68 as it is going through the sharpening process.
  • an assembly spacer 18 has a base 96, column 98, and insert 100.
  • the base 96 is circular and slightly larger in diameter to the column 98.
  • Column 98 is integral with the base 96 and insert 100.
  • Insert 100 has a shaft guide 102 and plurality of extensions 104. Insert 100 and has a central shaft guide 102 through which the shaft 42 extends. The plurality of extensions 104 extend from the central shaft guide 102 to a plurality of wall sections 106 of the column 98. Insert 100 is disposed within the hollow column 98.
  • the assembly spacer 18 is preferably manufactured from light-weight plastic or an alternative material known in the art. [0034] A cross-sectional depiction of the device 10 as assembled is shown. The power cord 20 and motor assembly 26 are affixed to the motor assembly base 28. Housing spacer 30 is fitted over the assembly spacer 18 such that housing spacer 30 is in direct contact with assembly spacer base 96.
  • the blade assembly 16 placed in rotationally loose communication with and inside of the assembly spacer column 98.
  • the blade assembly is placed atop the assembly spacer insert 100 as the shaft 42 is inserted within shaft guide 102 until it is placed in communication with the motor assembly 26.
  • the base 12 comes is fixedly attached to the motor assembly base 28 as the assembly spacer 18 extends through an aperture of the base 12 defined by edge 39.
  • the receptacle 46 is placed over the assembly spacer 18 such that the receptacle 46 is placed in tight communication with the housing spacer 30 and such that the inner wall 50 is placed in close contact with assembly spacer column 98.
  • the guide 50 is positioned such that the guide edge 70 and cover edge 64 are in direct contact with each other. Housing cover 48 is then placed in releasably tight communication with receptacle 46. After assembly of the device 10 has been completed the power cord 20 or alternative electric power means is engaged the device is ready to sharpen pencils 68.
  • the device 10 includes a coating 90 disposed on the blade surface 108.
  • Coating 90 provides cutting edges 94 with tough, hard, and wear resistant characteristics. The increased hardness of cutting edges 94 provides blade 78 with substantially increased longevity, while also providing the blade with corrosion resistance, as well as providing a smooth and uniform appearance and color.
  • U.S. Patent No. 6,988,318, titled "Coating for Cutting Implements” is hereby incorporated by reference.
  • An additional co-pending patent application, having a U.S. Application No. 10/695,429, filed on Oct. 28, 2003 is hereby incorporated by reference.
  • Coating 90 provides the blade 78 with a smooth wear-resistant surface 108.
  • coating 90 provides blade 78 with an aesthetically acceptable color or appearance. Specifically, coating 90 differentiates blade 78 having coating 90 from uncoated blades. The blade 78 can be viewed through the translucent receptacle 46 and identified by the consumer as a coated blade 78. However, coating 90 has an appearance sufficient to allow the consumer to recognize that the coating is present on blade 78. [0038] Further, coating 90 increases the ease of use of pencil-sharpening device
  • the device 10 by providing at least one blade 78 with a smooth surface finish, which reduces friction between the blade 78 and pencil 68 during use.
  • blade 78 and pencil 68 have less friction between the two, which provides a smoother cutting action, less cutting effort, and a reduced likelihood of a less than smooth sharpened pencil 68 tip than in coated blades without coating 90.
  • the device 10 includes a pair of coated blades (not shown), which provide a smooth cutting action and have less friction between the blades and a pencil.
  • Coating 90 is selected from the group consisting of titanium nitride (TiN), chromium nitride (CrN), and titanium chromium nitride (TiCrN).
  • the coating 90 is a multiple component barrier of titanium chromium nitride.
  • the coating 90 alternatively comprises titanium nitride, chromium nitride, and titanium chromium nitride.
  • Coating 90 is disposed on blade 78 such that the coating forms a metallurgical bond with the blade 78, which resists flaking, blistering, chipping, and peeling. In fact, coating 90 is adsorbed into the surface layer of the metal of blade 78.
  • Coating 90 is disposed on blade 78 with a thickness in a range between about 0.3 and 0.5 microns, more preferably about 0.4 microns.
  • the coating can be deposed by a first process known as reactive magnetron sputtering with a pulsed dc source.
  • a second process known as a cathode arc plasma (CAP) process.
  • CAP cathode arc plasma
  • the sputtering gas mixture in each process is argon and nitrogen. It is conceived that any physical vapor deposition
  • PVD PVD
  • a four-inch circular target is used with a pulsed dc power supply.
  • the target was a combination target having one or more 90-degree sections of pure titanium and chromium.
  • the target is three 90-degree sections of pure titanium and one 90-degree section of pure chromium.
  • each target is pure titanium and chromium.
  • the partial pressure of argon during the first process was maintained between 0 to 1 millitorr and that of nitrogen was maintained at 1 to 2 millitorr with the total sputtering gas pressure maintained between 2 to 3 millitorr.
  • the stainless steel chamber was evacuated to 2 x 10 "5 Torr prior to the deposition. Cleaning of the target was carried with argon alone.
  • the sputtering current was kept at 0.3 amps during cleaning that was carried out for 3 minutes in all depositions. Deposition of the films on the blades during cleaning was prevented by a shutter that was withdrawn soon after cleaning the target.
  • the sputtering current was chosen at two different values, 0.5 amperes and 0.7 amperes.
  • Depositions were performed for two different total sputtering times, 15 minutes and 30 minutes.
  • the resulting thickness of the films was found to be 0.3 micrometers and 0.6 micrometers, respectively.
  • the deposition temperature has been optimized for the following conditions. Stainless steel blades should not soften and therefore deposition temperature was kept at a temperature of about 150° and 200 0 C.
  • the hardness of the samples was measured using a Vickers microhardness test according to American Society of Testing and Materials (ASTM) E384, last revised March 2001.
  • ASTM American Society of Testing and Materials
  • a diamond indenter is loaded to a desired amount, which causes the indenter to indent the sample.
  • the indentation is measured and converted to a hardness value.
  • the indenter is a four-sided, pyramid-shaped diamond probe tip with angle of 136°.
  • the coated blade 78 is generally harder than an uncoated blade. The hardness tends to increase as the level of chromium is increased. Additionally, the satin silver appearance generally tends to increase as the content of chromium increases. [0047] However, blades 78 having a more balanced amount of titanium to chromium have a satin silver appearance. Here, it has been determined that consumers recognized pencil sharpener blades 78 having a satin silver appearance as being for general household use and as having a coating.
  • Chromium is typically about 2.5 times more expensive than titanium.
  • coating 90 of a majority of chromium leads to a substantial increase in cost, with only minimal gains in hardness.
  • coating 90 having 75% chromium and 25% titanium is about 95% as hard as a coating of 100% chromium.
  • the chromium nitride forms a strong bond to the blade, but does not form a strong bond with itself.
  • chromium nitride can form a strong bond with the chromium oxide of blade 78, but does not form a strong bond with other chromium nitride molecules.
  • the samples having a majority of chromium exhibited a higher tendency to peel than other samples having a minority of chromium.
  • Coating 90 having the desired hardness, smoothness, and diffusion barrier properties preferably is formed of titanium chromium nitride having about 35 percent by weight of titanium nitride and about 65 percent by weight of chromium nitride and with a hardness in a range of about 5.7 to about 9.1 gigapascals. More preferably, coating 90 has about 50 percent by weight of titanium nitride and about 50 percent by weight of chromium nitride and a hardness in a range of about 7.2 to about 7.6 gigapascals.
  • coating 90 having the aforementioned ratios of chromium nitride and titanium nitride provided the pencil-sharpening device blade 78 with a visual indication that the coating had been applied, without affecting the consumer's impression of the target use of the device (i.e., general household use). Moreover, coating 90 having the aforementioned ratios of chromium nitride and titanium nitride provided blade 78 with drastically improved hardness over the uncoated blades (not shown).
  • the surface roughness of blade 78 before and after the application of coating 90 was also measured.
  • the surface roughness of the surface of blade 78 before coating 90 was in a range of about 20 to 25 x 10 "6 inch/inch, but was reduced to about 15 to 20 x 10 "6 inch/inch after the coating was applied. It is believed that the roughness of blade 78 was reduced because the molecules of coating 90 predominantly bond with the valleys and indentations in the blade 78.
  • blade 78 is described above by way of example only as having a coating applied by reactive magnetron sputtering and CAP processes. Any thin film forming method such as chemical vapor deposition, physical vapor deposition, thermal spraying and sintering after a dip coating may be employed for providing coating 90 to blade 78. Preferably, the method of forming coating 90 has a maximum temperature sufficient to not soften or affect the heat-treatment of the uncoated blades.
  • coating 90 has been described above by way of example only as finding use with a pencil-sharpening device blade having a plurality of spiral shaped cutting surfaces.
  • Blade 78 is preferably made of steel, more preferably stainless steel, such as 420 stainless steel.
  • blade 78 can be heat-treated to further increase hardness.
  • the device 10 may be used for sharpening a variety of writing instruments, including but not limited to crayons, pencils, and any other reusable writing instruments that utilizes a volume reducing tip.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Drawing Aids And Blackboards (AREA)
  • Physical Vapour Deposition (AREA)

Abstract

La présente invention concerne un dispositif pour tailler les crayons comportant un revêtement au nitrure de chrome et de titane disposé sur la lame de coupe du dispositif. Le revêtement au nitrure de chrome et de titane est lié de façon métallurgique à la lame d’acier. La lame revêtue permet d’améliorer les propriétés du crayon.
EP06839775A 2005-11-08 2006-11-08 Dispositif pour tailler les crayons Withdrawn EP1954509A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US73449905P 2005-11-08 2005-11-08
PCT/US2006/060677 WO2007056751A2 (fr) 2005-11-08 2006-11-08 Dispositif pour tailler les crayons

Publications (1)

Publication Number Publication Date
EP1954509A2 true EP1954509A2 (fr) 2008-08-13

Family

ID=38024079

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06839775A Withdrawn EP1954509A2 (fr) 2005-11-08 2006-11-08 Dispositif pour tailler les crayons

Country Status (3)

Country Link
EP (1) EP1954509A2 (fr)
CA (1) CA2629198A1 (fr)
WO (1) WO2007056751A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1953004B1 (fr) 2007-01-24 2012-03-07 KUM Limited Lame pour un taille-crayon

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7913402B2 (en) * 2001-11-13 2011-03-29 Acme United Corporation Coating for cutting implements
DE60228482D1 (de) * 2001-11-13 2008-10-02 Acme United Corp Beschichtung für papierschneidevorrichtungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007056751A3 *

Also Published As

Publication number Publication date
WO2007056751A3 (fr) 2008-03-13
WO2007056751A2 (fr) 2007-05-18
CA2629198A1 (fr) 2007-05-18

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