CN101522085B - 受控地分配片材产品的分配器 - Google Patents
受控地分配片材产品的分配器 Download PDFInfo
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- A47K10/36—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means with mechanical dispensing, roll switching or cutting devices
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- A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
- A47K10/32—Dispensers for paper towels or toilet-paper
- A47K10/34—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means
- A47K10/36—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means with mechanical dispensing, roll switching or cutting devices
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- A47K10/00—Body-drying implements; Toilet paper; Holders therefor
- A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
- A47K10/32—Dispensers for paper towels or toilet-paper
- A47K10/34—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means
- A47K10/36—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means with mechanical dispensing, roll switching or cutting devices
- A47K10/3606—The cutting devices being motor driven
- A47K10/3625—The cutting devices being motor driven with electronic control means
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K10/00—Body-drying implements; Toilet paper; Holders therefor
- A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
- A47K10/32—Dispensers for paper towels or toilet-paper
- A47K10/34—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means
- A47K10/36—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means with mechanical dispensing, roll switching or cutting devices
- A47K2010/3668—Detection of the presence of a user
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K10/00—Body-drying implements; Toilet paper; Holders therefor
- A47K10/24—Towel dispensers, e.g. for piled-up or folded textile towels; Toilet-paper dispensers; Dispensers for piled-up or folded textile towels provided or not with devices for taking-up soiled towels as far as not mechanically driven
- A47K10/32—Dispensers for paper towels or toilet-paper
- A47K10/34—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means
- A47K10/38—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means the web being rolled up with or without tearing edge
- A47K2010/3881—Dispensers for paper towels or toilet-paper dispensing from a web, e.g. with mechanical dispensing means the web being rolled up with or without tearing edge with tearing edges having movable parts
Abstract
一种片材产品分配器,包括:连接到电动机的片材产品进给机构,所述片材产品进给机构在分配周期期间将片材产品移出分配器;和控制单元,所述控制单元在一部分分配周期期间控制片材产品进给机构或电动机、或者控制片材产品进给机构和电动机,以便以逐渐增大的速度或加速度、或者以逐渐增大的速度和加速度移动片材产品。
Description
相关申请的交叉引用
本申请要求2006年10月3日提交的美国临时专利申请No.60/849,194和2006年10月3日提交的美国临时专利申请No.60/849,209的权益,上述美国临时专利申请以引用的方式整体结合到本文中。
技术领域
本公开总体涉及片材产品分配器,更具体地涉及具有受控分配机构的片材产品分配器。
背景技术
纸产品的电子分配器在本领域是公知的,包括在感应到使用者的存在后自动分配计量(metered)长度的纸材料的分配器。这种类型的分配器已经在本领域中被称为“不用手”的分配器,因为它不需要使用者用手致动或操纵分配器来启动分配周期。传统的不用手的分配器的控制系统和机械特点很广并且各式各样。驱动电动机通常用于给分配机构提供动力。已知的控制系统在分配周期期间给这些驱动电动机提供突然的致动和停止。电动机速度或加速度的这种突然变化会导致冲击,这些冲击在分配周期期间传递到系统构件和纸产品。可能导致卡纸和部件过度磨损。
因此,存在对改进的受控地分配片材产品的分配器的不断需求。
发明内容
本文公开的是片材产品分配器和分配片材产品的方法。
在一个实施例中,一种片材产品分配器,包括:片材产品进给机构,其连接到电动机,所述片材产品进给机构在分配周期期间将片材产品移出分配器;和控制单元,其在一部分分配周期期间控制片材产品进给机构或电动机、或者控制片材产品进给机构和电动机,以便以逐渐增大的速度或加速度、或者以逐渐增大的速度和加速度移动片材产品。
在一个实施例中,一种分配片材产品的方法,包括:响应使用者的致动而致动变速分配机构,所述分配机构在分配周期期间逐渐增大被分配的片材产品的速度。
在一个实施例中,一种片材产品分配器,包括:电动机,其驱动分配机构以便移动片材产品;电池,其电压随时间减小;和电子控制器,其用于控制电动机和电池之间的连接,所述控制器确定电动机的运转时间,所述运转时间取决于电压,其中当电压随时间减小时,运转时间增长。
在一个实施例中,一种用于片材产品的分配器,包括:电动机,其驱动分配机构以便移动片材产品;和电子控制器,其用于操作地连接电动机和电池,其中根据电池电压电动机被驱动持续可变的时间段,当电池电压随时间减小时,通过增长电动机运转时间分配器将大体相等长度的片材产品移出分配器。
在一个实施例中,一种片材产品分配器,包括:电动机,其驱动分配机构以便移动片材产品;电池,其电压随时间减小;和电动机控制器,其确定电动机运转时间,所述运转时间由于电池电压的减小进行了校正。
上述特征和其它特征将通过下列附图和详细描述举例说明。
附图说明
参见示例性附图,其中在多个附图中相同的元件用相同的标记表示,附图中:
图1示出一个示例性片材产品分配器的一部分;
图2是图1分配器的一部分的视图;
图3是电动机运转时间和电池电压之间的关系图;
图4是示例性片材产品分配器的电动机速度或片材产品分配速度的速度和加速度曲线图;
图5是另一个分配器实施例的电动机速度或片材产品分配速度的速度曲线图;
图6是一个示例性片材产品分配器中使用的控制系统的状态图;
图7是备用操作模式中的控制系统操作的流程图;
图8是加速操作模式中的控制系统操作的流程图;
图9是电动机运转操作模式中的控制系统操作的流程图;
图10是减速操作模式中的控制系统操作的流程图;
图11是连续操作模式中的控制系统操作的流程图;以及
图12是停止运转操作模式中的控制系统操作的流程图。
具体实施方式
本文公开的是受控地分配片材产品的分配器。本文公开的控制机构可以有利地适用于各种片材产品分配器。例如,所述片材产品分配器可以使用一个或多个卷。术语“片材产品”包括天然和/或人造布或纸张。进一步地,片材产品可以包括织造制品和非织造制品。片材产品的例子包括但不限于揩布(wipers)、餐巾纸(napkins)、手巾纸(tissues)和纸巾(towels)。
现在参见图1,提供了整体用10表示的片材产品分配器的一部分,用以示意性地示出示例性自动片材产品分配器中使用的各个机械构件,同时应当理解的是,本文公开的机械构件不限制本发明。分配器的示例性机械特点包括但不限于在美国专利Nos.6,592,067、6,793,170、6,838,887、6,871,815、7,017,856、7,102,366、7,161,359、7,182,288、7,182,289和公开号为No.2007/0194166的美国专利中公开的那些机械特点,每个专利和专利申请都以引用的方式整体结合到本文中。
在一个实施例中,片材产品分配器10包括片材产品供应件(例如片材产品(例如手巾纸)卷11)和用于在分配器10内移动片材产品并将片材产品移出分配器10的进给机构。所述进给机构可以包括进给辊20、压紧辊21和片材产品滑槽22。分配器10可以适于不用手操作来分配一个或多个片材产品卷11。分配器10可以进一步包括可选的撕裂杆组件13,用于允许从片材产品卷11上分离一片片材产品。
如图1-2中所示,可选的撕裂杆组件13包括撕裂杆30和与微处理器(也可替换地称作控制器16)连通的撕裂杆开关31,所述微处理器将在下文作更详细地描述。操作中,为了取下片材产品卷11的一部分32,使用者抵靠固定的撕裂杆30向下拉动所述部分32。当抵靠撕裂杆30拉动片材部分32时,在片材和可运动臂34之间形成接触,这导致臂34转动成接触撕裂杆开关31。撕裂杆开关31在与臂34接合时发出撕裂操作已经进行的信号给控制器16。
再次参见图1,进给机构可以由电动机14(用虚线示出)驱动运转。电动机的类型根据应用而变化。例如,适合的电动机包括有电刷电动机和无电刷电动机(例如步进电动机)。电动机14由电源(未示出)供电,所述电源例如电池组或外部交流电(例如带有适当的变压器和适配器)或直流电源。此外应当理解的是,分配器10可以构造成在电池电源和交流电源之间切换。在一个实施例中,电动机14可以是由控制器16控制的变速直流电动机。
在一个实施例中,控制器16是在不直接测量片材产品分配长度的情况下进行操作的非反馈式控制器(non-feedback-based controller)。更特别的是,已经发现片材产品分配长度可以根据电动机的速度估计出,即电动机的速度与片材产品分配速度成比例。一旦选定用于分配器10的电动机14,就可以确定分配给定长度的片材产品所需要的时间。换句话说,控制器16可以编程为根据电动机的速度而运行预定的时间。应当进一步理解的是,控制器16可以设定为不同的片材长度设定值(例如4英寸、6英寸等)。
在一个实施例中,在分配周期的末期期间,控制器16减小电动机14和片材产品分配加速度和/或速度。在分配周期的中期期间,进给机构以可以是大体恒定的中间速度分配片材产品。在分配周期的初期期间,分配器10可以以受控的加速度移动片材产品。所述加速度可以根据片材产品的特性改变。加速度变化率可以与片材产品的强度相关。例如,手巾纸与纸巾相比可以以较小的加速度移动。
当分配器10由电池供电时,电池电压随时间减小。提供给驱动电动机的较小的电压导致较小的电动机速度。在一个实施例中,控制器16可以编程为增加分配周期的长度以校正电池电压的减小。因为这种校正,可以在整个电池使用寿命期间提供相对一致的片材产品分配长度。可以在分配周期期间测量电池电压。相比较而言,典型的分配机构通过不同的装置(例如在预定时间之后使驱动辊停止的定时电路或例如使用光学编码器或机械计数器测量驱动辊的旋转的旋转计数器)来测量被分配的片材长度。这种反馈式控制系统的局限性包括各种机械和电故障。
图3在周期地参考图1的情况下示出相关电动机14的运转时间与测得的电池电压的概念。图3示出电动机14的运转时间随着电池电压的减小而增加。在一个实施例中,控制器16利用电池电压信息而不是片材产品分配速度或长度来控制电动机14的接通时间,并因此控制片材产品分配长度。更特别的是,在一个实施例中,控制器16与电池电压传感器连通。因此,所有电路可以利用合理数量的连接器而结合在单个电路板上。
电动机14的转速和/或加速度由控制器16控制。电动机14可以是变速直流电动机,而控制器16可以给电动机14提供脉宽调制(PWM)速度控制。当电动机14的速度被控制器16改变时,片材产品在分配器10内移动并从分配器10中分配出的速度也发生改变。在一个实施例中,由于电动机14与分配机构的驱动辊直接连接,电动机14的速度和片材产品分配速度之间呈现出直接关系。
图4在周期地参考图1的情况下示出在分配器10的整个分配周期中片材产品分配速度、加速度和时间之间的关系。当电动机14的速度与片材产品分配速度成比例时,图4也示出电动机14在分配周期期间所呈现出的速度和加速度曲线。分配周期开始于接通开关的致动(即使用者的分配要求)。接通开关的信号可以例如由按钮开关、I/R(红外)接近传感器、电容式接近传感器或其它电子接近传感器提供。响应接通开关的致动,一定长度的片材产品在分配周期期间被分配。
图4示出在分配周期的初期、中期和末期期间电动机14的速度和加速度的可能的曲线。在分配周期的初期期间,电动机14的速度增大至最大电动机速度。在分配周期的中期期间,电动机14的速度大体恒定。中期的长度可以是固定的或是变化的,这由控制器16确定。在分配周期的末期期间,电动机14的速度逐渐减小为零。在一个实施例中,分配周期具有5秒至10秒的长度用于间断的操作模式。
在分配片材产品时,通过控制片材产品的加速度和减速度可以最小化产品的损坏和卡纸(jamming)。这对于轻质手巾纸产品是尤其重要的。片材产品的受控加速度也可以减小施加在传动和分配机构上的冲击载荷。
尽管图4示出分配周期期间速度和加速度的特殊曲线,但是分配周期期间的速度和加速度曲线可以变化。例如,在分配周期的初期期间电动机速度可以线性增加,或者可以根据特殊应用或产品以及根据在本周期或在先周期测得的电压缩短或加长中期的长度。可以想到的是,在分配周期期间可以利用各种不同的曲线实现产品的受控的速度和/或加速度的概念。在另一个实施例中,分配器10可以使用开关式电源而不再需要测量电压。换句话说,开关式电源提供恒定的电压输出。可以使用其它电动机控制技术来控制电动机14的速度。
图5示出在分配周期和随后的预先分配周期期间的另一个速度曲线。在预先分配周期期间,一段短长度的片材产品被分配。片材产品的长度可以由控制器16(图1)所限定的预先分配周期的特性确定。
在一个实施例中,再次参见图1-2,分配器10的控制系统包括具有多个输入和输出的电子控制器16。控制器16的输入可以包括但不限于电池电压信号、撕裂杆致动信号、连续模式开关信号、门开关信号、片材产品长度开关信号、前进开关信号和接通开关信号。控制器16的输出可以包括但不限于电动机控制信号以及用于运转、转出和低压电池的发光二级管信号。电动机控制信号用于控制电动机14的速度,并因此控制由本文所述的进给机构移动的片材产品的速度。电池电压信号由与电池组电源连通的电压传感器提供。在长度正被确定的周期期间可以测量所使用的电压信号。在一些实施例中,来自在先周期或本周期的测量值可以被存储和使用,如在以引用的方式整体结合到本文中的美国专利Nos.6,903,654和6,977,588中所讨论的。撕裂杆致动信号由撕裂杆开关31提供。门开关例如由选择性地接触外壳门的限位开关提供。片材产品长度开关信号例如由位置与不同的片材产品长度对应的三通开关提供。
现在参见图6,示出用于分配器控制器16的一个实施例的状态图。所述状态图示出控制器16和分配器10条件的相互排斥的操作状态。当一个或多个基础条件变化时状态之间发生变动。在分配周期期间,例如图4中所示,控制器16在图6的至少一些操作状态之间操作。
在备用状态期间,控制器周期性地确定是否应当进入分配操作。在备用状态中,电动机保持停止运转。图7示出一个实施例的流程图,该流程图示出处于备用状态的控制器的功能。例如,控制器在步骤1110、1112、1114通过接近传感器或运动传感器的操作来确定是否要求使用。在步骤1114确定使用要求时,在步骤1116控制器转换至加速状态。
图8示出一个实施例的流程图,该流程图示出处于加速状态时控制器的功能。在加速状态期间,控制器致动电动机,并且电动机的速度增大直到达到最大速度。加速状态与图4的分配周期的初期内的操作对应。如果可选的撕裂杆开关在进入加速状态时被致动,则在步骤1210控制器转换至制动(JAM)状态。否则,如步骤1212和1214所指示的,控制器经由电动机的脉宽调制而逐渐增大片材产品分配速度。如果可选的撕裂杆开关在这期间被致动,则在步骤1216、1218、1220控制器关闭电动机并转换回备用状态。一旦电动机驱动信号达到最大水平,则在步骤1222控制器转换至电动机运转状态。驱动信号的最大水平可以是可变的。在一个例子中,电动机驱动信号是在约20%至100%工作周期范围内的脉宽调制信号。
图9示出一个实施例的流程图,该流程图示出处于电动机运转状态时控制器的功能。电动机运转状态与图4的分配周期的中期内的操作对应。参见图9,在步骤1310读取片材产品长度开关,在步骤1312做出连续模式的选择决定。如果选择连续模式,则在步骤1313控制器转换至连续运转状态。如果没有选择连续模式,则在步骤1314控制器读取电池电压,在步骤1316计算对电池电压减小进行了校正的电动机运转时间。随后在步骤1318、1319、1320使电动机运转所计算出的运转时间。同时在电动机运转时,在步骤1321检测到撕裂杆开关的致动导致在步骤1322关闭电动机并且在步骤1323控制器转换至备用状态。运转时间结束时,在步骤1324控制器转换至减速状态。
图10示出一个实施例的流程图,该流程图示出处于减速状态时控制器的功能。该状态与图4的分配周期的末期对应。参见图10,在步骤1410、1412、1414控制器通过减少应用于电动机的脉宽调制工作周期而逐渐减小电动机的速度。撕裂杆开关在这期间的致动导致在步骤1416关闭电动机并且在步骤1418控制器转换至备用状态。一旦电动机的速度减至最小水平并停止,则在步骤1420控制器转换至停止运转状态。
图11示出一个实施例的流程图,该流程图示出处于连续状态时控制器的功能。在该操作模式中,只要接通开关被致动,控制器就提供连续的片材产品流动。在步骤1510设定连续超时计时器。在步骤1512查询时间是否剩余。如果在步骤1514接通开关(运动传感器)没有处于运转状态,则在步骤1516控制器转换至减速状态。在步骤1518撕裂杆开关的致动导致在步骤1520控制器关闭电动机并转换至备用状态。
图12示出一个实施例的流程图,该流程图示出处于停止状态时控制器的功能。参见图12,在步骤1610为停止运转状态限定计时器数值TIME以及超时数值TIMEOUT。例如,TIME=2秒,TIMEOUT=0秒。如在步骤1612所示,随后停用全部电动机、分配器发光二级管和接通开关/IR运动传感器。在步骤1614计时器数值TIME减少。在步骤1616查询撕裂杆开关的致动和/或TIME=TIMEOUT。如果撕裂杆开关已经致动或TIME=TIMEOUT,随后在步骤1618控制器转换至备用状态。否则,控制器返回步骤1612。
在一个实施例中,一种分配片材产品的方法,包括:在初期期间致动变速分配机构以第一加速度变化率移动片材产品;以及在中期期间致动分配机构以第二速度或第二加速度变化率移动片材产品。第二速度可以是大体恒定的。所述方法还包括在分配周期的末期期间致动分配机构以减小的速度或减速度变化率移动片材产品。分配机构包括电动机,所述电动机为进给辊提供移动片材产品的动力。
有利的是,与现有技术的驱动电动机的突然致动和停止运转相比,本文公开的实施例在分配周期期间提供了逐渐增大和逐渐减小的驱动电动机和/或片材产品加速度。因此,驱动电动机速度的这种受控的应用可以减小在分配周期期间施加给片材产品的力。益处包括但不限于分配机构中部件数量和尺寸的减小、较小频率的卡纸以及提高的产品可靠性。
尽管已经参考示例性实施例对本公开进行了描述,但是本领域技术人员将理解的是,可以在不脱离本公开范围的情况下进行各种改变以及用等价物替代本公开的元件。此外,可以在不脱离本公开实质范围的情况下作出很多修改以使特殊情况或材料适应本公开的教导。因此,希望本公开不局限于作为企图实现本公开的最佳模式而公开的特殊实施例,但是本公开将包括落入所附权利要求的范围内的所有实施例。
Claims (9)
1.一种片材产品分配器,包括:
片材产品进给机构,其连接到电动机,所述片材产品进给机构在分配周期期间将片材产品移出分配器;和
控制单元,其在一部分分配周期期间控制片材产品进给机构或电动机、或者控制片材产品进给机构和电动机,以便以逐渐增大的速度或加速度、或者以逐渐增大的速度和加速度移动片材产品;并且,在另一部分分配周期期间,片材产品进给机构以逐渐减小的速度或加速度、或者以逐渐减小的速度和加速度分配片材产品。
2.根据权利要求1所述的分配器,其中在又一部分分配周期期间,片材产品进给机构以大体恒定的速度分配片材产品。
3.根据权利要求1所述的分配器,其中电动机是直流电动机,并且其中控制单元利用脉宽调制方案来控制电动机速度。
4.根据权利要求1所述的分配器,其中分配器由电池供电,并且其中控制单元确定由于电池电压的减小进行了校正的电动机运转时间。
5.根据权利要求1所述的分配器,其中分配器由电池供电,并且其中控制单元随着电池电压的减小而增长分配周期。
6.根据权利要求1所述的分配器,其中分配器以连续模式操作,其中分配周期的长度没有被预先确定。
7.根据权利要求1所述的分配器,其中片材产品是手巾纸,受控的加速度能根据片材产品特性变化,并且受控的加速度与片材产品的强度相关。
8.一种分配片材产品的方法,包括:
响应使用者的致动而致动变速分配机构,所述分配机构在分配周期的初期期间逐渐增大被分配的片材产品的速度,并且,在另一部分分配周期期间,所述分配机构以逐渐减小的速度或加速度、或者以逐渐减小的速度和加速度分配片材产品。
9.根据权利要求8所述的方法,其中片材产品的速度在又一部分分配周期期间大体恒定。
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- 2007-10-03 CA CA2664846A patent/CA2664846C/en not_active Expired - Fee Related
- 2007-10-03 RU RU2009116633/12A patent/RU2425617C2/ru not_active IP Right Cessation
- 2007-10-03 CA CA2664853A patent/CA2664853C/en active Active
- 2007-10-03 WO PCT/US2007/080311 patent/WO2008042962A2/en active Application Filing
- 2007-10-03 EP EP07853747A patent/EP2066210A2/en not_active Withdrawn
- 2007-10-03 EP EP07853751A patent/EP2066211A2/en not_active Withdrawn
- 2007-10-03 MX MX2009003432A patent/MX2009003432A/es active IP Right Grant
- 2007-10-03 WO PCT/US2007/080316 patent/WO2008042964A2/en active Application Filing
- 2007-10-03 US US11/866,515 patent/US9144352B2/en active Active
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2011
- 2011-06-27 US US13/169,683 patent/US20110253828A1/en not_active Abandoned
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2013
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- 2013-07-26 US US13/951,711 patent/US9027871B2/en active Active
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Also Published As
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US20080128446A1 (en) | 2008-06-05 |
EP2066211A2 (en) | 2009-06-10 |
US9027871B2 (en) | 2015-05-12 |
US9144352B2 (en) | 2015-09-29 |
RU2009116633A (ru) | 2010-11-10 |
CN101522085A (zh) | 2009-09-02 |
RU2425617C2 (ru) | 2011-08-10 |
US20130306786A1 (en) | 2013-11-21 |
WO2008042964A2 (en) | 2008-04-10 |
WO2008042962A3 (en) | 2008-07-17 |
US8919688B2 (en) | 2014-12-30 |
WO2008042964A3 (en) | 2008-07-24 |
CA2664846C (en) | 2014-12-23 |
CA2664853C (en) | 2016-10-18 |
US7984872B2 (en) | 2011-07-26 |
EP2066210A2 (en) | 2009-06-10 |
US20080078777A1 (en) | 2008-04-03 |
CA2664853A1 (en) | 2008-04-10 |
MX2009003432A (es) | 2009-04-14 |
WO2008042962A2 (en) | 2008-04-10 |
US20130306785A1 (en) | 2013-11-21 |
US20110253828A1 (en) | 2011-10-20 |
CA2664846A1 (en) | 2008-04-10 |
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