CN102598849B - Cook top comprising at least two heating inductors - Google Patents
Cook top comprising at least two heating inductors Download PDFInfo
- Publication number
- CN102598849B CN102598849B CN201080050025.2A CN201080050025A CN102598849B CN 102598849 B CN102598849 B CN 102598849B CN 201080050025 A CN201080050025 A CN 201080050025A CN 102598849 B CN102598849 B CN 102598849B
- Authority
- CN
- China
- Prior art keywords
- heating
- kitchen range
- range top
- inverter
- inductor
- 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
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 128
- 239000003990 capacitor Substances 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims description 13
- 230000010355 oscillation Effects 0.000 claims description 11
- 230000010363 phase shift Effects 0.000 claims description 7
- 238000013508 migration Methods 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 244000144992 flock Species 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
- H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Induction Heating Cooking Devices (AREA)
- General Induction Heating (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a cook top comprising at least two heating inductors (10a, 10b), each of which is connected to at least one resonant circuit capacitor (26a, 26b) to form a resonant circuit. In order to provide a cost-saving cook top, at least one common resonant circuit capacitor (26a, 26b) is connected to the two heating inductors (10a, 10b).
Description
Technical field
The present invention relates to a kind of kitchen range top with at least two heating inductors as described in the preamble according to claim 1 and a kind of for the method for running this kitchen range top as described in the preamble according to claim 10.
Background technology
Known a kind of kitchen range top with two heating inductors from EP 0 986 287 A2, described heating inductor is connected with independent tank capacitor respectively.In traditional kitchen range top, usually irrelevant oscillation circuit is formed for each induction heating body that will run.Can be frequency and/or the amplitude that involved induction heating body selects heating current thus in a straightforward manner independently of each other, to adjust heating power independently of each other.
But, in order to meet relevant flickering (Flicker) criterion and in order to avoid interference hum, heating inductor adjacent under many circumstances runs with the heating current of same frequency.But in order to different heating powers can be realized, partly run heating element with time division multiplexing method.So different frequencies can be selected in time window that is different, that periodically repeat in this time division multiplexing method.But the method be expend and may owing to changing between time window time voltage jump and cause having the problem of flickering.
Summary of the invention
The present invention based on task especially, the low kitchen range top of a kind of cost and a kind of method for running this kitchen range top are provided.
This task especially by have independent claims 1 feature the kitchen range top and solved by the method for the feature with independent claims 10.Other favourable expansion scheme of the present invention and improvement project are drawn by dependent claims.
The present invention relates to a kind of kitchen range top with at least two heating inductors, described heating inductor is connected into oscillation circuit with at least one tank capacitor respectively.
Especially advise, at least one common tank capacitor is connected with two heating inductors.Can reduce the number of tank capacitor thus and the new-type regulation strategy can implemented for controlling the kitchen range top, described regulation strategy avoids the time division multiplexing method of the heating power for independently adjusting different heating inductors.Finally, the problem hum because the interference between irrelevant oscillation circuit causes can avoided and avoid having flickering.
Thus, the capacitor of connecting with heating inductor be called as tank capacitor, and described capacitor arrangement is in serial oscillation loop.Connection between tank capacitor and heating inductor especially can be the connection of link.High-frequency heating electric current is supplied by inverter in serial oscillation loop.The heating power of the frequency determination heating inductor of heating current, described heating inductor produces high-frequency alternating magnetic field.Alternating magnetic field produces eddy current in the bottom being placed in the cooker element on the kitchen range top, bottom described in described eddy heating for heating.
By using common tank capacitor, form the system be coupled by heating inductor and tank capacitor, described system needs new-type control strategy, can adjust different heating powers.If the kitchen range top comprises two inverters for supplying heating current respectively to one of heating inductor, then these new control strategies especially can be implemented simply.Especially, each in heating inductor should be connected on the output of independent inverter.
Advise in addition, to kitchen range top equipment control unit, described control unit can implement new-type control method.For this reason, control unit can be designed under at least one operational mode, with identical frequency operated inverter, make to avoid interference.In addition, the control unit phase in-migration that can be designed to by adjusting two inverters between switching signal controls the ratio of the heating power of two heating inductors.
Therefore give the heating current of two heating inductor supply same frequencys, but described heating current can have different phase places.Symmetry between the subsystem that two comprise a heating inductor is respectively broken thus, and occurs the heating current with different amplitude, and described subsystem is coupled via common tank capacitor.The ratio of described amplitude and thus therefore the ratio of heating power depends on selected phase shift, described phase shift can be adjusted by the hope of control unit according to operator.Total heating power therefore can adjust by selecting the frequency of heating current and the ratio of heating power by selecting the adjustment of phase in-migration, can make the heating power that at least can adjust at least two heating inductors in a word in large codomain independently of each other.
If control unit at least can control the ratio of heating power in the scope of parameter by the pulse length adjusting the heating current pulse produced by inverter, then the additional degree of freedom can be unlocked.
If the pulse length of two inverters is adjusted to identical value and this value ground relevant to the ratio of desired heating power when frequency given in advance is selected, then the DC component in heating current can be avoided in this case.
If the kitchen range top comprises the memory cell of the characterisitic family for storing at least bidimensional, then heating power can with user default about ground when without expend calculating adjusted.Characterisitic family and the ratio of the heating power that will handle and total heating power of two heating inductors about store the phase shift and/or pulse length that will adjust.
By using two common tank capacitors, described tank capacitor is connected with two heating inductors, each wherein in two tank capacitors is connected with the pole of current supply unit and inverter forms half-bridge circuit between two pole respectively, can improve the electromagnetic radiation characteristic of the kitchen range top.
If common tank capacitor is the part of the common tank capacitor device with variable total capacitance, then the resonance frequency of oscillation circuit or total system can be changed.For this reason, such as common tank capacitor can be connected or separate from described system.
Invention thought can be generalized to the kitchen range top with three or more heating inductor without scruple, and described heating inductor and one or more common capacitor are connected into oscillation circuit.
Another aspect of the present invention relates to a kind of method for running the kitchen range top with at least two heating inductors, and described heating inductor and at least one capacitor are connected into oscillation circuit.The kitchen range top comprises two in addition for producing the inverter of heating current for heating inductor.
Suggestion, common capacitor is connected with two heating inductors, and passes through the phase shift adjusted between the switching signal of two inverters and/or the ratio being controlled the heating power of two heating inductors by the pulse length adjusting heating current in cycle duration situation given in advance.
Accompanying drawing explanation
Other advantage is described by accompanying drawing below and draws.In the drawing, embodiments of the invention are shown.Accompanying drawing, specification and claims comprise large measure feature in combination.Technical staff also will consider described feature individually aptly and be summarized in other combinations significant.
Fig. 1 illustrates the schematic configuration of the kitchen range top with two heating inductors and a pair common tank capacitor used,
Fig. 2 illustrates the pulse shape of the heating current produced by two inverters of the kitchen range top of Fig. 1 according to control method of the present invention,
Fig. 3 illustrates the two dimensional nature family of curves of the ratio of the heating power of two heating inductors of the kitchen range top according to Fig. 1 and Fig. 2,
Fig. 4 illustrates the two dimensional nature family of curves of the total heating power for two heating inductors determining the kitchen range top of the present invention, and
Fig. 5 illustrates the schematic configuration of the kitchen range top of the present invention according to alternative expansion scheme of the present invention of the tank capacitor device had with variable total capacitance.
Embodiment
Fig. 1 schematically shows the structure of the induction kitchen range top with two heating inductors 10a, 10b, and described heating inductor is connected respectively on the output of inverter 12a, 12b.Inverter 12a, 12b supply direct current by current supply unit.Current supply unit comprises filter 14 and rectifier 16.The 50 Hz alternating voltages that filter 14 smoothly obtains from the phase 18 of family expenses electrical network, described alternating voltage is rectified device 16 and converts direct current to.
Rectifier 16 and inverter 12a, 12b each between arrange damped capacitor 20a, 20b respectively, described damped capacitor works as low pass filter and prevents the high-frequency heating current feedback produced by inverter 12a, 12b in household electric net.
Inverter 12a, 12b are arranged between two poles of the supply voltage of rectification in half-bridge circuit.Inverter 12a, 12b are formed by IGBT or MOSFET a pair with the free wheeling diode that inverse parallel is arranged and are run the high-frequency heating electric current for generation of having the frequency typically being 20 to 200 kHz respectively.For this reason, control unit alternately turns on and off two semiconductor switchs of inverter 12a, 12b.At this, control unit 22 not only can be determined the cycle T of the process that turns on and off independently of each other but also can determine to turn on and off relative duration and thus its pulse length Pa, the Pb in stage independently of each other.
According to the present invention, the output of heating inductor 10a, 10b flocks together and is connected with common tank capacitor device 24, and described tank capacitor device comprises two tank capacitor 26a, 26b of being connected with two heating inductors 10a, 10b respectively.Tank capacitor 26a, 26b connect with two heating inductors 10a, 10b and are connected with the pole of the current supply unit comprising filter 14 and rectifier 16 respectively on the other hand.Two tank capacitors 26a, 26b are equivalent to the common capacitor arranged in connection line 28, so described common capacitor must have the electric capacity of twice and its electric capacity will determine the resonance frequency of oscillation circuit together with the inductance of heating inductor one of 10a, 10b.
Diagram in FIG is especially simplified, because the kitchen range top also can comprise the inductor more than two, described inductor or can be connected with common tank capacitor device 24 in couples or also can be assigned to common tank capacitor device 24 with the group of three or more heating inductors.
Fig. 2 illustrates switching signal, and wherein described switching signal is transferred to the semiconductor switch of inverter 12a, 12b by control unit 22 via unshowned control circuit here.Curve Q1 in fig. 2 corresponds to the signal of the switch above the inverter 12a in FIG, second curve Q2 illustrates the switching signal of the switch below inverter 12a above, and curve Q3 and Q4 illustrates two one poles of inverter 12b below, the switching signal of ovonic switch.
Control unit 22 alternation ground turns on and off each in switch with cycle T.Cycle T and thus the frequency of heating current produced by inverter 12a, 12b is identical for two inverters 12a, 12b.Can not disturb thus.But switch pulse is postponed d by phase shift toward each other, pulse length Pa, the Pb of two inverters are different, and especially may selection Pa=T/2 or Pb=T/2 also from common different.By selecting to postpone d and pulse length Pa, Pb, control unit 22 can adjust the amplitude of the heating current flowing through heating inductor 10a, 10b neatly and thus determine the heating power of heating inductor 10a, 10b.
Fig. 3 schematically shows two dimensional nature family of curves, and it to be stored in the memory cell 30 of control unit 22 and to use the ratio for determining heating power by control unit 22.The frequency of characterisitic family and heating current and postpones d about the ratio of heating power is described, wherein delay d is illustrated as the sub-fraction of cycle T.Line shown in Figure 3 is the line with constant heating power ratio.
Fig. 4 illustrates another two dimensional nature family of curves from memory cell 30, and it is according to frequency and postpone total heating power that the component d/T of d to cycle T illustrates heating inductor 10a, 10b.The line with constant total heating power is shown in the diagram equally.
Fig. 3 and 4 relates to the situation Pa=Pb=T/2 of simplification, wherein dead time t1 to t4(Fig. 2) be considered by rights.Dead time t1 to t4 corresponds to the following time: although namely in the described time corresponding semiconductor switch open, electric current flows on the self-oscillation direction of the free wheeling diode arranged with this semiconductor switch inverse parallel.The semiconductor switch of inverter 12a, 12b is generally opened during the described stage, to avoid connecting loss.But this is only possible in the parameter area determined, this parameter area is in outside the region B forbidden shown in oblique line in figures 3 and 4.Within the region B that this is forbidden, occur direct-cut operation, wherein electric current is interrupted suddenly and causes handoff loss.
Total heating power desired by first control unit 22 calculates when the specified heating power given in advance of heating inductor 10a, 10b and this total heating power is distributed to have constant total heating power in the diagram shown in one of isopleth.Then, control unit 22 is determined the ratio of two specified heating powers of heating inductor 10a, 10b and is determined corresponding isopleth in characterisitic family in figure 3.The intersection point of described two isopleth is determined and its coordinate is determined, thus to determine the frequency that will be handled by control unit 22 and to postpone d.This process can certainly all to execution in advance for desired heating power, make it possible to from characterisitic family, directly determine frequency respectively and postpone d.
If intersection point is within the region B that forbids, then change pulse length Pa, Pb, thus to determine suitable delay d when pulse length Pa given in advance, Pb for suitable heating frequency.In memory cell 30, characterisitic family is deposited for the different ratio of pulse length Pa, Pb for this reason.
Fig. 5 illustrates another alternate embodiments of the present invention with switchable tank capacitor device 24, and described tank capacitor device amounts to and comprises four tank capacitors 26a, 26b, 26c, 26d.Tank capacitor 26c, 26d can be switched on by means of switch 32 or cut off in ground relevant to desired resonance frequency, can avoid handoff loss thus and can pass the region B forbidden with high handoff loss.Self-evident, also it is contemplated that the capacitor with continuously adjustabe joint or the tank capacitor device 24 more than the different probable value of two with total capacitance.
Reference numeral
10 heating inductors
12 inverters
14 filters
16 rectifiers
18 phases
20 damped capacitors
22 control units
24 tank capacitor devices
26 tank capacitors
28 connection lines
30 memory cell
32 switches
B region
D postpones
Q1 curve
Q2 curve
Q3 curve
Q4 curve
Pa pulse length
Pb pulse length
The T cycle
Claims (9)
1. there is the current supply unit of band two poles, at least two heating inductor (10a, 10b) and at least two for being respectively described heating inductor (10a, one of the 10b) inverter (12a of supply heating current, kitchen range top 12b), described heating inductor respectively with at least one tank capacitor (26a, 26b) be connected into oscillation circuit, wherein said inverter (12a, half-bridge circuit between two poles 12b) forming described current supply unit respectively, it is characterized in that, at least one common tank capacitor and two heating inductor (10a, 10b) and with at least one pole of described current supply unit be connected, and the described kitchen range top also has control unit, described control unit is designed to by adjustment at two inverter (12a, phase shift (d) between switching signal (Q1-Q4) 12b) controls two heating inductor (10a, the ratio of heating power 10b).
2. the kitchen range top according to claim 1, is characterized in that described control unit is designed to identical frequency operated inverter (12a, 12b).
3. the kitchen range top according to claim 2, it is characterized in that, described control unit (22) is designed to the pulse length (Pa by adjusting the heating current pulse produced by inverter (12a, 12b), Pb) ratio of the heating power of heating inductor (10a, 10b) is controlled.
4. the kitchen range top according to claim 3, it is characterized in that, described control unit (22) is designed to two inverter (12a, pulse length (Pa 12b), Pb) identical value is adjusted to, and select described value when frequency given in advance relevantly with the ratio of the specified heating power of heating inductor (10a, 10b).
5. according to the kitchen range top one of claim 2 to 4 Suo Shu, it is characterized in that memory cell (30), for storing the characterisitic family of at least one at least bidimensional, described characterisitic family comprises the phase shift (d) that will adjust about ground with the ratio of the heating power that will handle of two heating inductors (10a, 10b) and total heating power.
6. according to the kitchen range top one of Claims 1-4 Suo Shu, it is characterized in that at least two common tank capacitors, described tank capacitor and two heating inductor (10a, 10b) connect, each wherein in two tank capacitors is connected with the pole of current supply unit.
7. according to the kitchen range top one of aforementioned claim 1-4 Suo Shu, it is characterized in that, common tank capacitor is the part of the common tank capacitor device (24) with variable total capacitance.
8. according to the kitchen range top one of aforementioned claim 1-4 Suo Shu, it is characterized in that three or more heating inductor, described heating inductor is connected with common tank capacitor.
9. for running the current supply unit with band two poles, at least two heating inductor (10a, 10b) and at least two for being described heating inductor (10a, 10b) produce the inverter (12a of heating current, the method of kitchen range top 12b), described heating inductor and at least one tank capacitor (26a, 26b) be connected into oscillation circuit, wherein said inverter (12a, half-bridge circuit between two poles 12b) forming described current supply unit respectively, it is characterized in that, at least one common tank capacitor (26a, 26b) with two heating inductor (10a, 10b) and with at least one pole of described current supply unit be connected, and by adjustment at two inverter (12a, phase in-migration between switching signal 12b) controls two heating inductor (10a, the ratio of heating power 10b).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES200930959A ES2378607B1 (en) | 2009-11-05 | 2009-11-05 | COOKING FIELD WITH AT LEAST TWO HEATING INDUCTORS. |
| ESP200930959 | 2009-11-05 | ||
| PCT/IB2010/054907 WO2011055283A1 (en) | 2009-11-05 | 2010-10-29 | Cook top comprising at least two heating inductors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102598849A CN102598849A (en) | 2012-07-18 |
| CN102598849B true CN102598849B (en) | 2014-12-31 |
Family
ID=43432130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080050025.2A Expired - Fee Related CN102598849B (en) | 2009-11-05 | 2010-10-29 | Cook top comprising at least two heating inductors |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2497332B1 (en) |
| CN (1) | CN102598849B (en) |
| ES (2) | ES2378607B1 (en) |
| PL (1) | PL2497332T3 (en) |
| WO (1) | WO2011055283A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2453714A1 (en) * | 2010-11-10 | 2012-05-16 | BSH Bosch und Siemens Hausgeräte GmbH | Induction heating device |
| CN103836682B (en) * | 2012-11-26 | 2016-12-21 | 美的集团股份有限公司 | A kind of electromagnetic oven with multiple kitchen range |
| CN103307646B (en) * | 2013-05-14 | 2015-10-21 | 广东鼎燊科技有限公司 | A kind of commercial induction cooker unloading pick-up unit and method |
| US10993292B2 (en) | 2017-10-23 | 2021-04-27 | Whirlpool Corporation | System and method for tuning an induction circuit |
| WO2021115871A1 (en) * | 2019-12-13 | 2021-06-17 | BSH Hausgeräte GmbH | Induction device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1868417A1 (en) * | 2006-06-14 | 2007-12-19 | Brandt Industries | Induction system, method for powering an inductor and cooktop comprising same |
| CN201178498Y (en) * | 2008-04-03 | 2009-01-07 | 深圳和而泰智能控制股份有限公司 | Surge protection circuit for electromagentic furnace |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4390769A (en) * | 1980-05-29 | 1983-06-28 | General Electric Company | Induction heating apparatus providing smooth power control |
| IT1281843B1 (en) * | 1995-01-25 | 1998-03-03 | Meneghetti Ampelio & C S N C | CONTROL DEVICE ESPECIALLY FOR MULTI-PLATE INDUCTION COOKERS |
| ES2143430B1 (en) | 1998-09-08 | 2000-12-16 | Balay Sa | TWO OUTPUTS INVERTER CIRCUIT, AND CIRCUIT AND PROCEDURE FOR CONTROLLING THE POWER DELIVERED IN THE INVERTER OUTPUTS. |
| ES2265758B1 (en) * | 2005-03-01 | 2007-11-16 | Bsh Electrodomesticos España, S.A. | HEATING DEVICE FOR AN INDUCTION KITCHEN. |
| ES2330496B1 (en) * | 2007-10-31 | 2010-09-08 | Bsh Electrodomesticos España, S.A. | COOKING DEVICE. |
-
2009
- 2009-11-05 ES ES200930959A patent/ES2378607B1/en not_active Revoked
-
2010
- 2010-10-29 PL PL10778726T patent/PL2497332T3/en unknown
- 2010-10-29 EP EP10778726.9A patent/EP2497332B1/en active Active
- 2010-10-29 ES ES10778726.9T patent/ES2589044T3/en active Active
- 2010-10-29 CN CN201080050025.2A patent/CN102598849B/en not_active Expired - Fee Related
- 2010-10-29 WO PCT/IB2010/054907 patent/WO2011055283A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1868417A1 (en) * | 2006-06-14 | 2007-12-19 | Brandt Industries | Induction system, method for powering an inductor and cooktop comprising same |
| CN201178498Y (en) * | 2008-04-03 | 2009-01-07 | 深圳和而泰智能控制股份有限公司 | Surge protection circuit for electromagentic furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2589044T3 (en) | 2016-11-08 |
| EP2497332A1 (en) | 2012-09-12 |
| CN102598849A (en) | 2012-07-18 |
| EP2497332B1 (en) | 2016-08-17 |
| PL2497332T3 (en) | 2017-01-31 |
| ES2378607B1 (en) | 2013-03-14 |
| WO2011055283A1 (en) | 2011-05-12 |
| ES2378607A1 (en) | 2012-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BSH HOME APPLIANCES CO., LTD. Free format text: FORMER NAME: BOSCH UND SIEMENS HAUSGERATE GMBH |
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| CP01 | Change in the name or title of a patent holder |
Address after: Munich, Germany Patentee after: BSH Household Electrical Appliance Co., Ltd Address before: Munich, Germany Patentee before: BSH Bosch and Siemens Household Appliances Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141231 Termination date: 20201029 |