US20110217664A1 - gas burner apparatus with pre-mixing - Google Patents
gas burner apparatus with pre-mixing Download PDFInfo
- Publication number
- US20110217664A1 US20110217664A1 US13/127,153 US200913127153A US2011217664A1 US 20110217664 A1 US20110217664 A1 US 20110217664A1 US 200913127153 A US200913127153 A US 200913127153A US 2011217664 A1 US2011217664 A1 US 2011217664A1
- Authority
- US
- United States
- Prior art keywords
- burner
- sealing element
- holes
- section
- ducts
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
- F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
Abstract
A gas burner apparatus with pre-mixing includes a mixing device for mixing an air/gas mixture which is intended to be conveyed to the intake section of a fan unit whose delivery is conveyed to a combustion head of the burner. The mixing device including a plurality of ducts, each of which has a region in the form of a Venturi duct with contiguous portions which are convergent/divergent, with respect to the direction of flow, and with a restricted duct cross-section defined between the convergent portion and the divergent portion, there being conveyed in each convergent portion an air flow which is intended to be mixed with a gas flow which is introduced into the duct at the restricted cross-section, the air/gas mixture being conveyed through the divergent portion of the duct to the intake section of the fan unit. Each duct of the plurality is defined by the engagement of at least a first and a second mutually separate burner region along a mutual engagement profile, there being carried on each of the burner regions corresponding, separate portions of each of the ducts, at least a first fluid-tight sealing element being provided between the burner regions along the engagement profile in order to prevent gas and/or air from being drawn in with respect to the ducts. The at least first sealing element is interposed between the burner regions at the restricted cross-section of each of the Venturi ducts of the plurality of ducts; the at least first sealing element has through-holes which define the restricted cross-section of the corresponding Venturi duct in at least some of the plurality of ducts, as a result of the engagement of the burner regions along the engagement profile and is interchangeable with at least a second sealing element which has corresponding through-holes, whose overall size for the relevant cross-sections is different from the overall size for the cross-sections relating to the corresponding holes of the first sealing element, so as to vary the overall cross-section defined by the plurality of holes of the ducts, with at least the first element being interchanged with at least the second sealing element, and consequently to control the burner in accordance with the thermal power required and/or the flow resistances which exist in the ducts for supplying the air/gas mixture to the burner.
Description
- The present invention relates to a gas burner apparatus with pre-mixing having the features set out in the preamble of claim 1.
- In the specific technical sector, it is known to construct gas burners of the pre-mixing type, for example, for condensation boilers, whose combustion head is intended to be received in a combustion chamber, to which the air/gas mixture is supplied by means of the delivery of a fan unit. An example of such a burner apparatus is known from Italian Patent Application No. PD2007A000413, in which there is described a burner which is connected to a cover or another similar closure element of the combustion chamber and in which there are coaxially mounted a fan unit and a cap-like combustion head. In such an application, the air/gas mixture which is burnt is at the surface of the combustion head of the burner is in the form of a plurality of mixing ducts which are open towards the outer side of the burner in order to draw in air and through which the air, once mixed with the gas, is directed towards the intake section of the fan. Each of those ducts generally functions under reduced pressure, with the fan positioned downstream and is in the form of a Venturi duct, that is to say, which is formed by a convergent portion which is contiguous relative to a divergent portion, between which there is defined a minimum cross-section of the Venturi duct, a reduction in the pressure signal (pressure reduction) being produced in that cross-section. That signal is typically used to draw in from the valve the combustible gas which is then introduced into the mixing duct in order to then become mixed with the air drawn in by the reduced pressure.
- The pressure signal which is generated in the minimum cross-section of the Venturi duct is further a function of various parameters. For example, if the number of revolutions of the fan increases, for a given geometry, a greater flow of air is drawn in with a greater velocity through the minimum cross-section and therefore a greater pressure reduction is consequently generated. Furthermore, if the flow resistances downstream of the fan change, the signal changes as a result. For example, if the flow resistances increase, the signal decreases and, in order to be able to maintain it at the levels before the increase in the flow resistances, it is normally necessary to use another Venturi duct having a smaller minimum cross-section. However, this results in a cost increase because it requires the production and control of additional components in the burner. That problem is particularly apparent in applications in which the range of adjustment of the thermal output means that such components have to be replaced for correct adjustment of the burner.
- The problem addressed by the present invention is to provide a burner apparatus which is structurally and functionally configured so as to allow the limitations set out with regard to the cited prior art to be overcome. This problem is solved by the invention by means of a burner apparatus constructed in accordance with the appended claims.
- Further features and advantages of the invention will be better appreciated from the following detailed description of one preferred embodiment thereof which is illustrated by way of non-limiting example with reference to the appended drawings, in which:
-
FIG. 1 is a partially sectioned, perspective view of a burner apparatus constructed in accordance with the present invention, -
FIG. 2 is a schematic view of a detail of the burner ofFIG. 1 , -
FIG. 2A is a schematic view of another detail ofFIG. 1 , -
FIGS. 3 and 4 are partially sectioned, perspective views of a detail of the preceding Figures in separate assembly steps, -
FIGS. 5 and 6 are front elevation views of a detail ofFIG. 4 in two separate construction forms, -
FIG. 7 is another front elevation view of another construction variant of the detail ofFIGS. 5 and 6 . - With reference to the Figures set out, a gas burner apparatus with pre-mixing constructed in accordance with the present invention is generally designated 1.
- The burner comprises a
combustion head 2, preferably having a cap-like construction whose base is advantageously secured to acover 3 which constitutes a closure element of a combustion chamber (not illustrated) which is associated with the burner. - A
fan unit 4, whoseimpeller 5 of the centrifugal type is coaxial with the combustion head, is further rotatably supported on the cover. The axis of rotation of the impeller, which is actuated by anelectric motor 6, is designated X. - Behind the
combustion head 2 and internally with respect thereto, there is provided a distribution element which is designated 7 and which is also substantially of cap-like form and is provided with through-holes for distributing the air/gas mixture to the combustion head. - There remains defined in the body of the burner, between the
distribution element 7 and theimpeller 5 facing it, an internal space or volume which is generally designated 8 and in which there are conveyed, in a separate and distinct manner, the mixture which is from thedelivery cross-section 9 of the fan and which is directed to thedistributor 7, and the flow of the air/gas mixture which is directed to theintake section 10 of the fan. Such a burner structure is described in detail in the Italian patent application which is referred to above and filed under number PD2007A000413, to which reference is made here concerning any details which are not expressly set out below. - More specifically, there are provided a first plurality of conveying ducts which are designated 11 and which are capable of conveying the combustible air/gas mixture to the
combustion head 2 which is supplied by way of thedelivery side 9 of the fan and a second plurality of conveyingducts 12 which are suitable for conveying the flow of air and/or gas which is taken from outside the burner body in the direction of theintake section 10 of the fan. That intake section is arranged at the same side of thehead 2 and is in communication with afirst chamber 13 which is defined in the volume space 8 which remains between thehead 2 and theimpeller 5. The pluralities ofducts 11 and 12 are further selected in terms of size and structure so that the flow of the air/gas mixture to the delivery side of the fan intersects with the flow of air and/or gas which is directed to the intake section, as schematically illustrated inFIG. 2 , in which the above-mentioned flows are conveyed so as to be separate and distinct from each other by theducts 11 and 12, respectively. - The ducts 11 of the corresponding plurality extend in the region of the
delivery section 9 of the fan, outside the outer diameter of theimpeller 5, in order to connect that delivery section to asecond chamber 14 for distributing the mixture, whichchamber 14 is also defined in the space 8 between thedistributor 7 and the impeller and is separated from thechamber 13 by means of awall 15. - The ducts 11 are distributed circumferentially, downstream of the
delivery section 9, with a pre-selected angular interval, in particular with a regular angular interval. Each of the ducts 11 further has, with respect to the direction of flow, an inlet opening 11 a for the mixture (provided from the delivery side of the fan), in which the flow has a prevailing radial component, and a discharge opening 11 b, at the opposite end, in which the flow has a prevailing axial component. Downstream of the discharge opening, thechamber 14 is configured so as to further deviate the flow in order to convey it along thedistributor 7 in order to efficiently supply thecombustion head 2. - The second plurality of conveying
ducts 12 is configured in order to generate pre-mixing of the air, taken from outside, with the gas which is introduced into the duct and thereby to convey a pre-mixed air/gas flow to theintake section 10 of the fan. - The
ducts 12 are arranged in an alternating position with respect to the ducts 11 in such a manner that, in the region of intersection of the flows, designated M inFIG. 2 , eachduct 12 is interposed between a pair of ducts 11 which are adjacent to each other. - Each
duct 12 is open at the outer side of the burner, at theintake section 12 a of the duct, by way of which a flow of air is drawn in and extends as far as anopposite discharge section 12 b which is placed in communication with theintake section 10 of the fan. Only one of theducts 12 will be described in detail below, because they are of identical construction. - Each
duct 12 is provided with mixing means, which comprise a portion of the duct itself that is configured as a Venturi duct, that is to say, comprising aconvergent portion 16 a which extends into a contiguous,divergent portion 16 b, there remaining defined between the portions a restricted section (minimum section) of the Venturi duct, designated 16 c. At thatminimum section 16 c, there is introduced a flow of gas into the Venturi duct, drawn in by the reduced pressure brought about in the minimum section. The duct is designated 17 and continues in the form of avalve 18, which is only schematically illustrated and which is capable of conveying the combustible gas into thecorresponding duct 12, at thatminimum section 16 c.FIG. 2A is a purely schematic view of the pre-selected configuration in relation to the Venturi duct. - Each
duct 12 is further formed following the engagement of a first region and a second region of the burner, which are separate from each other, along a surface engagement profile, the first region which is generally designated A being defined in the base structure of thecover 3 which extends axially upstream of the impeller, the second region which is generally designated B being arranged downstream of the impeller and in which thewall 15 is arranged in the delivery zone of the burner. There is interposed between the burner regions A and B a fluid-tight sealing element which is designated 20 and which has the main function of preventing gas and/or air from being drawn in between theducts 11 and 12 in a relative manner. - The
sealing element 20 is advantageously of planar annular form with reduced transverse thickness, as clearly shown inFIG. 4 . According to a main feature of the invention, that sealing element is positioned at the restrictedsections 16 c of the ducts 12 (minimum section of the Venturi duct). Thesealing element 20 is further provided, in the annular wall thereof, with a plurality of through-holes which are all designated 21 and which define the restricted section of the corresponding Venturi duct at least in some of the plurality ofducts 12, once the regions A and B of the burner have been engaged along the engagement profile thereof, with theseal 20 being interposed. - With reference to
FIG. 5 , the through-holes 21 are arranged circumferentially with a regular angular interval along the annular wall of theseal 20. They have, when viewed in cross-section, a substantially drop-like shape. A corresponding through-hole 22 having the shape of the cross-section extending in a prevailing direction, as clearly shown inFIG. 5 , is provided and is associated in an adjacent position with respect to eachhole 21. Thoseholes 22 define the sections of passage of the gas flow, for each of theducts 17, at the restricted section of the Venturi duct, where there occurs the introduction of the combustible gas into the air flow which is conveyed by theducts 12. - In greater detail, each
duct 17 is, upstream of theseal 20, in communication with achannel 17 a which extends in an annular manner in the burner region A, concentrically relative to the axis X, which serves to distribute and convey the gas from the valve in each of theducts 17. Thechannel 17 a is jointly defined by the burner region A and theseal 20 which is contiguous therewith. - There is further defined in the sealing
element 20 another plurality of through-holes which are all designated 23 and which delimit the cross-section of passage of the flow of the air/gas mixture which is supplied by thedelivery 9 of the fan and which is directed to thedistributor 7 of the combustion head. In other words, thoseholes 23 define the cross-section of each of the ducts 11, in the region of theseal 20, and are positioned along the circumferential profile of the seal, in alignment with theholes 21 with a pre-selected, regular, angular interval. In the preferred embodiment ofFIG. 5 , there is provision for theholes 23 to be provided in an alternating manner with respect to theholes 21, along a common circular profile which is concentric relative to the axis X so that eachhole 23 is interposed between a pair of mutuallyadjacent holes 21, as clearly illustrated inFIG. 5 . - In accordance with a main feature of the invention, the sealing
element 20 is configured so as to be interchangeable with at least a second sealing element which is designated 20′ (illustrated inFIGS. 4 and 6 ) and which is provided with a plurality of through-holes 21′ having the same function as the correspondingholes 21 of theseal 20, the overall size of the cross-sections of thoseholes 21′ being different (greater or smaller than) from the overall size of the cross-sections relating to theholes 21′. In that manner, by theseal 20 being interchanged with theseal 20′, it is possible to vary the overall section relating to the flow of air which is drawn into the burner in order to consequently adjust the burner in accordance with the thermal output required and/or the flow resistances which exist in the supply ducts of the air/gas mixture. - It will be appreciated that the invention allows the provision of a plurality of sealing elements with the number and shape of the
holes 21 which are advantageously pre-selected in accordance with the requirements for adjustment and the power intervals required for the operation of the burner. Reference will be made below only to a second interchangeable sealing element, it being possible to provide a plurality of mutually interchangeable seals. - In a first preferred embodiment, there is provision for there to be the same number of
holes seal FIGS. 5 and 6 , respectively. Theholes 21 are further equally spaced apart from each other, as are theholes 21′, 23 and 23′. - The
second sealing element 20′ differs from theseal 20 in that there are providedholes 21′ each having a cross-section of greater size than the size of each correspondinghole 21 of theseal 20. - In a variant of the
seal 20′, generally designated 20″, there can instead be provision for the number ofholes 21″ to be different from the number ofholes 21′, but with theholes 21′ and 21″ having the same cross-section. InFIG. 7 , which illustrates that variant, it is clearly shown how there are provided only sixholes 21″, unlike theseal 20′ which has ninecorresponding holes 21′. As a result, for a given cross-section of theholes 21′ and 21″, the overall section varies when theseal 20′ is interchanged with theseal 20″. - Naturally, other construction variants are possible, all directed towards the provision of different configurations of calibrated holes for the passage of intake air, in the restricted section of the Venturi duct, for each of the seals which are provided and which are mutually interchangeable, in such a manner as to generate the desired pressure signal and in order to control the gas valve. Advantageously, it is possible in that manner to ensure wide modulation in accordance with the thermal power required, for each power range, simply by the sealing element being interchanged, without any other additional components and without any modification of the other structural components of the burner both at the side of the cover and at the delivery side. As a result, therefore, control of the burner apparatus is simplified and facilitated, even in the presence of broad modulation ranges that are required for the thermal power of the apparatus.
- It is further possible, if considered advantageous, to provide for throttling of the passage sections of the gas in the
ducts 17, by way of different provision (concerning the number and size of the section) of theholes 22 in each of the sealing elements which may be provided and which can be mutually interchanged. - The invention thereby solves the problem set out, resulting in the advantages set out above in relation to known solutions.
Claims (10)
1. A gas burner apparatus with pre-mixing comprising mixing device for mixing an air/gas mixture which is intended to be conveyed to the intake section of a fan unit, whose delivery is conveyed to a combustion head of the burner, the mixing device comprising a plurality of ducts, each of which has a region in the form of a Venturi duct with contiguous portions which are convergent/divergent, with respect to the direction of flow, and with a restricted duct cross-section defined between the convergent portion and the divergent portion, there being conveyed in each convergent portion an air flow which is intended to be mixed with a gas flow which is introduced into the duct at the restricted cross-section, the air/gas mixture being conveyed through the divergent portion of the duct to the intake section of the fan unit, each duct of the plurality being defined by the engagement of at least a first and a second mutually separate burner region, along a mutual engagement profile, there being carried on each of the burner regions corresponding, separate portions of each of the ducts, at least a first fluid-tight sealing element being provided between the burner regions along the engagement profile in order to prevent gas and/or air from being drawn in with respect to the ducts, the at least first sealing element is interposed between the burner regions at the restricted cross-section of each of the Venturi ducts of the plurality of ducts,
in that the at least first sealing element has through-holes which define the restricted cross-section of the corresponding Venturi duct in at least some of the plurality of ducts, as a result of the engagement of the burner regions along the engagement profile,
and in that at least the first sealing element is interchangeable with at least a second sealing element which has corresponding through-holes, whose overall size for the relevant cross-sections is different from the overall size for the cross-sections relating to the corresponding holes of the first sealing element (20), so as to vary the overall cross-section defined by the plurality of holes of the ducts, with at least the first element being interchanged with at least the second sealing element, and consequently to control the burner in accordance with the thermal power required and/or the flow resistances which exist in the ducts for supplying the air/gas mixture to the burner.
2. A burner apparatus according to claim 1 , wherein at least the first sealing element and second sealing elements which are mutually interchangeable are of annular shape and the through-holes which are provided in each corresponding sealing element are provided so as to be circumferentially and angularly spaced apart from each other.
3. A burner apparatus according to claim 1 , wherein the holes which are provided in the first sealing element all have the same predetermined size for the cross-section and the holes which are provided in the second sealing element all have the same predetermined size for the cross-section, which is different from that provided in the first sealing element.
4. A burner apparatus according to claim 3 , wherein the holes in the first sealing element are provided so as to be equal in number to the holes of the second sealing element.
5. A burner apparatus according to claim 1 , wherein each hole of the first element has a size for the cross-section that is equal to that of the cross-section of each hole of the second sealing element, and the total number of holes of the first element is different from the total number of holes of the second sealing element.
6. A burner apparatus according to claim 1 , wherein the holes which are provided in the first sealing element and second sealing element are regularly spaced apart from each other with a predetermined angular interval.
7. A burner apparatus according to claim 1 , wherein there is provided, by means of the holes of the corresponding sealing element, the passage for the flow of air which is drawn into the burner, with corresponding second, separate holes being provided in the sealing elements and defining the cross-section of passage of the gas flow which is introduced into the restricted cross-section of each Venturi duct.
8. A burner apparatus according to claim 7 , wherein there is provided, for each sealing element, a hole for the passage of gas in a position adjacent to a corresponding hole for the passage of intake air.
9. A burner apparatus according to claim 1 , wherein there are provided, in each of the sealing elements, a plurality of third through-holes which define the cross-section of passage, at the engagement profile of the burner regions, of ducts which are capable of conveying flows of the air/gas mixture which are supplied from the delivery side of the fan unit in the direction of the burner head.
10. A burner apparatus according to claim 9 , wherein the third holes are circumferentially arranged in each of the sealing elements, alternating with the holes for the passage of the intake air.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITPD2008A000324 | 2008-11-07 | ||
ITPD2008A000324A IT1391676B1 (en) | 2008-11-07 | 2008-11-07 | GAS BURNER UNIT WITH PRE-MIXING |
PCT/IT2009/000487 WO2010052746A2 (en) | 2008-11-07 | 2009-10-27 | A gas burner apparatus with pre-mixing |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110217664A1 true US20110217664A1 (en) | 2011-09-08 |
Family
ID=41128215
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/127,153 Abandoned US20110217664A1 (en) | 2008-11-07 | 2009-10-27 | gas burner apparatus with pre-mixing |
Country Status (8)
Country | Link |
---|---|
US (1) | US20110217664A1 (en) |
EP (1) | EP2342496B8 (en) |
CN (1) | CN102209869B (en) |
CA (1) | CA2742758C (en) |
IT (1) | IT1391676B1 (en) |
RU (1) | RU2511820C2 (en) |
UA (1) | UA101997C2 (en) |
WO (1) | WO2010052746A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9062881B2 (en) | 2012-02-16 | 2015-06-23 | Empire Comfort Systems, Inc. | Control system for space heater/hearth |
EP2921777A1 (en) * | 2014-03-19 | 2015-09-23 | Yahtec | Burner device with gas premix |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITPD20130189A1 (en) * | 2013-07-05 | 2015-01-06 | Sit La Precisa S P A Con Socio Uni Co | AIR-GAS MIXER DEVICE FOR PRE-MIXING BURNER EQUIPMENT |
CN110748887B (en) * | 2017-06-27 | 2021-11-09 | 珠海优特智厨科技有限公司 | Gas equipment |
CN113680224A (en) * | 2020-05-19 | 2021-11-23 | 彼特威有限责任公司 | Gas/air mixing device for gas burner |
IT202100025352A1 (en) * | 2021-10-04 | 2023-04-04 | Raffaele Antonio Spezia | APPLICATIONS OF A MICRO NOZZLE ELEMENT |
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- 2009-10-27 CA CA2742758A patent/CA2742758C/en not_active Expired - Fee Related
- 2009-10-27 WO PCT/IT2009/000487 patent/WO2010052746A2/en active Application Filing
- 2009-10-27 UA UAA201107242A patent/UA101997C2/en unknown
- 2009-10-27 CN CN2009801448313A patent/CN102209869B/en not_active Expired - Fee Related
- 2009-10-27 US US13/127,153 patent/US20110217664A1/en not_active Abandoned
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WO2009077426A1 (en) * | 2007-12-19 | 2009-06-25 | Ln 2 S.R.L. A Socio Unico | A centrifugal fan |
WO2009077455A1 (en) * | 2007-12-19 | 2009-06-25 | Ln 2 S.R.L. A Socio Unico | A fluid-mechanical machine, in particular a centrifugal fan |
WO2009080527A2 (en) * | 2007-12-19 | 2009-07-02 | Ln 2 S.R.L. A Socio Unico | Fan unit for gas-burners with pre-mixing and burner apparatus including said fan |
WO2009087050A2 (en) * | 2008-01-08 | 2009-07-16 | Ln 2 S.R.L. A Socio Unico | Air/gas mixing device, particularly for pre-mixing burner apparatuses |
WO2009087041A2 (en) * | 2008-01-08 | 2009-07-16 | Ln 2 S.R.L. A Socio Unico | Inlet device for an air/gas flow in a fan unit, particularly for gas burners with pre-mixing |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9062881B2 (en) | 2012-02-16 | 2015-06-23 | Empire Comfort Systems, Inc. | Control system for space heater/hearth |
EP2921777A1 (en) * | 2014-03-19 | 2015-09-23 | Yahtec | Burner device with gas premix |
FR3018900A1 (en) * | 2014-03-19 | 2015-09-25 | Yahtec | BURNER DEVICE WITH PRE GAS MIXTURE |
Also Published As
Publication number | Publication date |
---|---|
CA2742758C (en) | 2017-03-07 |
EP2342496B1 (en) | 2015-02-25 |
EP2342496A2 (en) | 2011-07-13 |
CN102209869A (en) | 2011-10-05 |
IT1391676B1 (en) | 2012-01-17 |
RU2511820C2 (en) | 2014-04-10 |
UA101997C2 (en) | 2013-05-27 |
CA2742758A1 (en) | 2010-05-14 |
EP2342496B8 (en) | 2015-04-22 |
CN102209869B (en) | 2013-09-04 |
WO2010052746A2 (en) | 2010-05-14 |
RU2011122829A (en) | 2012-12-20 |
ITPD20080324A1 (en) | 2010-05-08 |
WO2010052746A8 (en) | 2010-07-08 |
WO2010052746A3 (en) | 2011-04-07 |
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