JP3656391B2 - Solar cell module - Google Patents

Solar cell module Download PDF

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Publication number
JP3656391B2
JP3656391B2 JP04975598A JP4975598A JP3656391B2 JP 3656391 B2 JP3656391 B2 JP 3656391B2 JP 04975598 A JP04975598 A JP 04975598A JP 4975598 A JP4975598 A JP 4975598A JP 3656391 B2 JP3656391 B2 JP 3656391B2
Authority
JP
Japan
Prior art keywords
terminal box
solar cell
bypass diode
terminal
cell module
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.)
Expired - Fee Related
Application number
JP04975598A
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Japanese (ja)
Other versions
JPH11251614A (en
Inventor
幸雄 篠田
憲秀 袴田
剛 高田
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP04975598A priority Critical patent/JP3656391B2/en
Publication of JPH11251614A publication Critical patent/JPH11251614A/en
Application granted granted Critical
Publication of JP3656391B2 publication Critical patent/JP3656391B2/en
Anticipated expiration legal-status Critical
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-RED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30Electrical components
    • H02S40/34Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
    • H02S40/345Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes with cooling means associated with the electrical connection means, e.g. cooling means associated with or applied to the junction box
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-RED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30Electrical components
    • H02S40/34Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a terminal box that suppresses a temperature increase of a bypass diode for preventing abnormal overheating of a solar cell module and improves reliability.
[0002]
[Prior art]
In general solar cell modules, a plurality of solar cells are electrically connected in series, and for the purpose of electrical insulation and waterproofing, they are adhered to a glass plate with a transparent resin and the back side is made of a weather-resistant film. In order to take out the electrical output, the output tab wire is taken out from the opening hole provided in the weather-resistant film on the back surface and connected to the output cable.
By connecting the output tab wire and the output cable electrically to the conductive terminal board, the connection reliability of the connecting portion is ensured, and the connection portion of the output tab wire and the output cable is electrically insulated, waterproof, etc. For this purpose, it is covered with a terminal box and filled with an insulating resin and sealed.
FIG. 5 is a perspective view of such a solar cell module, and FIG. 6 is a sectional view thereof.
In the figure, a plurality of solar cells 1 are connected in series by a tab wire 2, and transparent heat-bonding adhesives 4, 4 a such as EVA (ethylene vinyl acetate) and a moisture-proof film 5 are connected to a glass plate 3. Are fixed to the mounting frame 7 via an insulating rubber 6.
The output tab wire 8 is connected to one end of the terminal board 10 through the through hole 5 a of the moisture-proof film 5 and the through hole 9 a of the terminal box 9. An output cable 11 is connected to the other end of the terminal board 10.
[0003]
FIG. 7 shows a connection diagram inside the solar cell module of FIG. 5, in which a plurality of solar cells 1 are connected in series. In addition, 13 is a positive output terminal, 14 is a negative output terminal, and 15 is an intermediate output terminal connected to a place where the number of solar cells 1 connected in series is just divided into two.
Two bypass diodes 16 are respectively connected in parallel between the positive output terminal and the intermediate output terminal and between the intermediate output terminal and the negative output terminal.
When all the light hits the solar battery cell 1 and the power is normally generated, the output terminal side of 13 becomes a positive voltage with respect to the output terminal side of 14, and the voltage of the intermediate output terminal of 15 Since the number of sheets is set at a half position, the voltage becomes a positive voltage with respect to the output terminal 14 at an intermediate voltage value between the output terminal 13 and the output terminal 14.
When an external load 18 is connected to the output terminals 13 and 14, a current I1 flows as shown in the figure. In this state, no current flows through all the bypass diodes 16 due to their diode characteristics.
A waterproof connector 12 is attached to the tip of the output cable 11, and a plurality of modules can be easily connected in series.
[0004]
Next, the operation of the bypass diode will be described with reference to FIG.
When one leaf 1a with a solar cell 1 has fallen leaves or the like and no light hits it and no power is generated, and the remaining solar cell hits the light and generates electric power, Although the current I2 flows to the external load 18 as a whole, the shaded solar cell 1a does not generate power, and thus becomes a kind of resistance.
A potential difference between the resistance value and the current flowing therethrough is generated at both ends of the solar cell 1a which is shaded, and the voltage at both ends of the bypass diode 16a, that is, the output terminal 14 and the intermediate output terminal 15 The voltages are reversed and currents I2a / 2 flow in the bypass diodes 16a, respectively. As a result, the currents I2b flowing in the shaded solar cells are reduced.
As a result, the amount of heat generated by the shaded solar cells is reduced to prevent an abnormal temperature rise, and the output of at least half of the shaded solar cells divided by the bypass diode is effective. Can be taken out.
[0005]
[Problems to be solved by the invention]
As described above, since the conventional solar cell module has a large number of solar cells connected in series, any solar cell that is shaded by sunlight due to leaves or the like cannot be shaded from solar cells. The reverse bias voltage is applied due to the heat generation, and an abnormal temperature rise occurs. As the number of series-connected solar cells increases, the abnormal temperature rise of the solar cells that are shaded increases. For this reason, in order to prevent the damage by the abnormal temperature rise of the photovoltaic cell which became the shadow by partial sunlight, the bypass diode is connected for every about 20 or less in series number of photovoltaic cells.
If there is a solar cell that is partially shaded, current flows through the bypass diode, and the bypass diode generates heat. However, since the bypass diode is housed in the terminal box, the heat dissipation is not good and the temperature tends to rise.
The terminal box is molded with resin, and the inside is sealed with insulating resin. Since the terminal box is a resin molded product, heat transfer is poor and the temperature rise of the bypass diode is high.
[0006]
In addition, the size of one conventional solar battery cell was about 100 mm square, but since the size was increased and a 150 mm square was put to practical use, the output current of the solar battery cell was proportional to the area, so the conventional 100 mm square was used. The output current of a 150 mm square solar battery cell is twice or more, and the temperature rise of the diode becomes higher.
Furthermore, the power generation efficiency of a normal solar battery cell is about 15%, and the remaining solar energy heats up as the temperature of the solar battery cell rises. The temperature of the bypass diode is also raised.
In view of the above problems, the present invention has been made to provide a highly reliable terminal box of a solar cell module that suppresses the temperature rise of the bypass diode and has high reliability.
[0007]
[Means for Solving the Problems]
According to the present invention, the lid of the terminal box of the solar cell module is made of metal, and a part of the lid of the terminal box is in direct contact with the surface of the diode or via a filler.
[0008]
Further, a part of the lid of the terminal box becomes a convex portion inside the terminal box, and is in direct contact with the heat dissipation surface of the diode or through a filler.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Embodiments of the present invention will be described below.
FIG. 1 is a front view showing a state in which a terminal box lid fixed to the back surface of the solar cell module of the present invention is removed, FIG. 2 is a cross-sectional view taken along section A in FIG. 1, and FIG. Front view when the terminal box is covered.
In the figure, a plurality of solar cells 1 are connected in series by a tab wire 2, and transparent heat-bonding adhesives 4, 4 a such as EVA (ethylene vinyl acetate) and a moisture-proof film 5 are connected to a glass plate 3. Are laminated and fixed.
The terminal box 9 is bonded and fixed to the moisture-proof film 5 with an adhesive 20, and the output tab wire 8 is connected to the terminal plate 10 through the moisture-proof film 5 and the through hole 9 d of the terminal box 9.
[0010]
The terminal box 9 is a rectangular box composed of a bottom surface portion 9a and a side surface 9c rising from the bottom surface portion, and is integrally formed of synthetic resin. A through hole 9d passing through the output tab wire 8 on the inner bottom surface 9a of the box, a recess 9b having a recess on the solar cell module side for fixing the bypass diode 16, and a boss 9e for tightening the screw 22 Ribs 9f are formed. The through hole 9d is formed in a substantially rectangular shape between the side surface 9c and the recess 9b. The recess 9b is formed so that an air layer is formed on the moisture-proof film 5 side. A mounting surface 9g of the bypass diode 16 in the recess 9b is formed into a flat surface. It is in shape and communicates to facilitate air passage. The bypass diode 16 is fixed to this T-shaped intersection. The width of the recess 9b is equal to or slightly larger than the width of the bypass diode 16.
[0011]
The boss 9e is a pillar for tightening the screw 22 to fix the terminal board 10 and the terminal box lid, and has a pilot hole in the screw.
[0012]
The rib 9f is provided in a circular shape so as to surround the periphery when the terminal plate 10 and the bypass diode 16 are fixed at a predetermined height. A part of the rib 9f is provided so that the edge of the through hole 9d surrounds the through hole 9d, and a plurality of notches for supporting the output cable 11 are provided in a semicircular shape on the other side facing this part. ing. The height of the rib 9f from the bottom surface portion 9a is such that these parts are covered with the insulating resin 22 when the terminal board 10 or the bypass diode 16 is attached and the periphery thereof is filled with the insulating resin 22. The insulating resin 22 is filled inside surrounded by the rib 9f, and a space is formed between the rib 9f and the side surface 9c so that the insulating resin is not filled. Therefore, the insulating resin can be saved correspondingly.
[0013]
On the side surface 9c of the terminal box, a step for attaching a terminal box lid to be described later is provided over the entire circumference. Similarly, a plurality of portions where the output cable exits are provided in a semicircular shape corresponding to the notch portion that supports the output cable provided in the rib 9f.
[0014]
The terminal board 10 is a thin copper plate having a substantially rectangular shape, and has three types of shapes 10a, 10b and 10c. In the shape of 10a, one end forms a plane on which the output tab wire 8 is soldered and connected, and the other side is caulked with a conductor of the output cable 11, and a bypass diode is provided in the vicinity of the approximate center between both ends. It has a tongue portion 10d having a hole for connecting 16 terminals 17 to each other. Further, holes for fastening screws 22 for fixing the terminals to the terminal box 9 are provided so as to be distributed to the two convex portions 10d. 10b is symmetrical with respect to 10a, and is the same except that the direction of the conductor connecting portion of the output cable is reversed.
[0015]
The terminal 10c is shorter than the terminals 10a and 10b, and the end is aligned with the position of the tongue 10d. Two holes for connecting the terminals 17 of the bypass diodes are provided at the ends not connected to the output tab wires 8. A hole for fastening the screw 22 for fixing to the terminal box 9 is provided at approximately the center of the terminal 10c. The output cable 11 is connected by caulking the lead wire portion to the terminal board 10 and then soldering the lead wire portion. The terminal 17 of the terminal board 10 is connected to the terminal 17 connection hole by soldering after the terminal 17 of the bypass diode 16 is passed therethrough.
[0016]
Although there are four bypass diodes 16 shown in FIG. 7 of the conventional example, in FIG. 3 of the present embodiment, four bypass diodes 16 are integrally formed in one package, and terminals 10a, 10b, 10c are formed. 1 is set in an inner portion surrounded by ribs 9f inside the terminal box 9 in the state shown in FIG.
[0017]
The terminal box lid 21 is formed by molding a corrosion-resistant metal such as stainless steel or aluminum or an iron plate material subjected to anticorrosion treatment. The terminal box lid 21 has a substantially square flat plate shape, and is fixed to the terminal box 9 with screws 22. Covering the inside. The terminal box lid 21 has an inwardly protruding portion 21a. The elastic force of the terminal box lid 21 is used to press and contact the bypass diode 16, thereby improving heat transfer and improving the heat dissipation effect of the bypass diode. .
[0018]
Even if the filler of the insulating resin 22 filling the inside of the terminal box 9 is interposed between and in contact with the terminal box lid 21 and the bypass diode, the heat radiation effect from the terminal box lid 21 can be obtained. Even if the terminal box lid 21 and the insulating resin 22 are not in direct contact, since the terminal box lid 22 is made of metal, the heat dissipation effect is improved as compared with the conventional resin. Further, even if the terminal box lid 21 has no projection 21a and is flat, the heat dissipation effect remains unchanged as long as it is in contact with the bypass diode 16.
[0019]
FIG. 4 is a front view of the terminal box 9 as seen from the bonding surface side, and the recess 9b is a groove that extends to the peripheral edges 19a, 19b, and 19c.
The concave portion 9b extends to the peripheral portions 19a, 19b, and 19c of the terminal box around the position of the bypass diode 16 inside the terminal box 9, and extends in three directions in FIG. It may be a single groove shape extending to the 19a, 19b side, a groove shape extending to the four peripheral portions of the cross shape, or any shape that flows out even when water or the like enters from the peripheral portion. Since the recess 9b communicates with the plurality of peripheral portions in this way, it easily flows out even when water enters, and water and dirt do not accumulate in the recess, so that the heat dissipation effect of the bypass diode is not deteriorated. It is possible to prevent the adhesive strength of the terminal box 9 from being lowered.
Further, when the air is warmed, it rises by natural convection and the heat escapes, so that a cooling effect can be obtained.
[0020]
Thus, while providing an air layer on the joint surface side of the terminal box 9 with the back surface of the solar cell module, the heat transfer from the solar cell module is reduced, and the heat dissipation effect of the heat generated from the bypass diode 16 is enhanced. By increasing the heat dissipation effect by making the terminal box lid 21 made of metal, the temperature rise of the entire terminal box can be reduced. For this reason, the size of the bypass diode 16 to be used can be reduced, the thickness of the entire terminal box can be reduced, and the thickness of the solar cell module can be reduced.
[0021]
【The invention's effect】
According to the present invention, the lid of the terminal box is made of metal, so that heat dissipation from the lid surface is good, the temperature rise of the entire terminal box due to heat generated from the bypass diode can be reduced , and the lid of the metal terminal box is made Since it is in contact with the bypass diode, the heat of the bypass diode can be radiated efficiently, the temperature rise of the bypass diode can be kept low, the reliability is improved, and a relatively small capacity diode can be used. Miniaturization is possible.
[0022]
In addition, by pressing the bypass diode with a part of the terminal box lid protruding from the inside of the terminal box, the terminal box lid and the bypass diode can be securely contacted, and the terminal box cover other than the bypass diode can be contacted. An insulation distance can be secured.
[Brief description of the drawings]
FIG. 1 is a front view showing a state in which a terminal box lid of a terminal box fixed to the back surface of a solar cell module of the present invention is removed.
FIG. 2 shows a cross-sectional view of a terminal box fixed to the back surface of the solar cell module of the present invention.
FIG. 3 is a front view of a terminal box fixed to the back surface of the solar cell module of the present invention.
FIG. 4 is a front view of the terminal box fixed to the back surface of the solar cell module of the present invention as viewed from the bonding surface side.
FIG. 5 is a perspective view of a conventional solar cell module.
FIG. 6 shows a cross-sectional view of a conventional solar cell module.
FIG. 7 shows an internal connection diagram of a conventional solar cell module.
FIG. 8 shows an internal connection diagram of a conventional solar cell module.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Solar cell, 3 Glass plate, 4 Transparent heat-fusion adhesive agent, 5 Moisture-proof film, 8 Output tab wire, 9 Terminal box, 9d Through-hole part, 9b Terminal box recessed part, 10 Terminal board, 16 Bypass diode, 20 Adhesive, 21 Terminal box lid.

Claims (2)

  1.   A plurality of solar cells are electrically connected in series, and a terminal box for taking out an output cable for electrical connection of the plurality of solar cells is provided on the back side. In the solar cell module in which the bypass diode is connected between the outputs of the solar cell, the lid of the terminal box is made of metal and a part thereof is in direct contact with the heat radiating surface of the bypass diode or through a filler. A solar cell module characterized by comprising:
  2. 2. The solar cell according to claim 1 , wherein a part of the lid of the terminal box that is in direct contact with the heat radiating surface of the bypass diode or in contact with the filler is convex on the inside of the terminal box. module.
JP04975598A 1998-03-02 1998-03-02 Solar cell module Expired - Fee Related JP3656391B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP04975598A JP3656391B2 (en) 1998-03-02 1998-03-02 Solar cell module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP04975598A JP3656391B2 (en) 1998-03-02 1998-03-02 Solar cell module

Publications (2)

Publication Number Publication Date
JPH11251614A JPH11251614A (en) 1999-09-17
JP3656391B2 true JP3656391B2 (en) 2005-06-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP04975598A Expired - Fee Related JP3656391B2 (en) 1998-03-02 1998-03-02 Solar cell module

Country Status (1)

Country Link
JP (1) JP3656391B2 (en)

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EP3089357A1 (en) 2015-04-30 2016-11-02 Hosiden Corporation Terminal box and solar cell module

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JP3600615B1 (en) * 2003-08-01 2004-12-15 オーナンバ株式会社 Terminal box for solar panel
JP5131562B2 (en) * 2004-05-07 2013-01-30 住友電装株式会社 Terminal box for solar cell module
JP4515817B2 (en) * 2004-05-18 2010-08-04 株式会社三社電機製作所 Solar cell module connector
KR101040335B1 (en) * 2004-05-25 2011-06-10 키타니 덴기 가부시키가이샤 Terminal box for solar cell module
DE112005002898B4 (en) * 2004-11-25 2012-11-22 Sansha Electric Manufacturing Co., Ltd. A solar cell module connector
JP2006351606A (en) * 2005-06-13 2006-12-28 Sumitomo Wiring Syst Ltd Terminal box for solar cell module
JP5048226B2 (en) * 2005-07-12 2012-10-17 オーナンバ株式会社 Terminal box for solar panel
JP4851131B2 (en) * 2005-07-12 2012-01-11 オーナンバ株式会社 Terminal box for solar panel
JP3852711B1 (en) 2005-11-09 2006-12-06 住友電装株式会社 Terminal box for solar cell module
DE102007020843A1 (en) 2007-03-28 2008-10-02 Günther Spelsberg GmbH & Co. KG junction box
CN101647123B (en) * 2007-04-13 2012-08-29 胡贝尔和茹纳股份公司 Receptacles
JP5146406B2 (en) * 2009-05-27 2013-02-20 住友電装株式会社 Terminal box for solar cell module
CN102804396B (en) * 2009-06-25 2015-04-29 三菱电机株式会社 Terminal box for solar cell module
JP5053346B2 (en) * 2009-09-25 2012-10-17 株式会社三社電機製作所 Solar cell module connector
JP2011109029A (en) * 2009-11-20 2011-06-02 Sumitomo Wiring Syst Ltd Terminal box for solar cell module, and method for producing the terminal box for solar cell module
US8563849B2 (en) * 2010-08-03 2013-10-22 Sunpower Corporation Diode and heat spreader for solar module
JP2013048180A (en) * 2011-08-29 2013-03-07 Mitsubishi Electric Corp Connection box for photovoltaic generation
JP2014212137A (en) * 2011-08-31 2014-11-13 三洋電機株式会社 Solar cell module
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US9635783B2 (en) * 2012-03-30 2017-04-25 Sunpower Corporation Electronic component housing with heat sink

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EP3089357A1 (en) 2015-04-30 2016-11-02 Hosiden Corporation Terminal box and solar cell module
US9685905B2 (en) 2015-04-30 2017-06-20 Hosiden Corporation Terminal box and solar cell module

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