EP1025392B1 - A gas hotplate burner - Google Patents
A gas hotplate burner Download PDFInfo
- Publication number
- EP1025392B1 EP1025392B1 EP97936624A EP97936624A EP1025392B1 EP 1025392 B1 EP1025392 B1 EP 1025392B1 EP 97936624 A EP97936624 A EP 97936624A EP 97936624 A EP97936624 A EP 97936624A EP 1025392 B1 EP1025392 B1 EP 1025392B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- burner
- crown
- gas
- flames
- directed
- 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 - Lifetime
Links
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
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
- F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
- F23D14/06—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with radial outlets at the burner head
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/08—Arrangement or mounting of burners
- F24C3/085—Arrangement or mounting of burners on ranges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/14—Special features of gas burners
- F23D2900/14062—Special features of gas burners for cooking ranges having multiple flame rings
Definitions
- the invention relates to a gas hotplate burner of the kind comprising a gas nozzle fitted into the bottom part of a burner body assembly, a supply passage for primary air, preferably taking the form of a circular slit, a mixing venturi, a crown structure defining a chamber, and a cap structure providing a lid for the same.
- Burners based on the principle of a cap covering a crown being a circular array of openings for the gas mixture burning on the outside of the crown are known as is the use of a short venturi which has the advantage that the mixing takes place in a short vertical distance as opposed to the traditional long venturi. This enables a low profile of a cooker arrangement which is particularly suitable for fitting into existing cupboards without wasted space.
- a larger amount of gas per time unit i.e. a larger diameter nozzle or injector for the same pressure
- This calls for more primary air in order to obtain the correct gas/air mixture.
- This is traditionally obtained by means of a larger supply passage for primary air.
- EP 0 534 301 A discloses a gas hotplate burner comprising a gas nozzle fitted into the bottom part of a burner body assembly, a supply passage for primary air, in the form of a circular slit, a mixing venturi, a crown structure defining a chamber, and a cap structure providing a lid for the same.
- the crown and cap structures define a ring-shaped chamber having flame openings on at least part of the inside perimeter as well as on the outside.
- DE 44 27 953 A discloses a gas hotplate burner of a kind similar to that disclosed in EP 0 534 301 A.
- the object of the invention to further improve the use of the area defined by the burner crown and cap structures.
- the object is achieved by a gas hotplate burner as defined above in which the crown and cap structures further define a central circular chamber, flame openings being available on the outside perimeter of said central circular chamber.
- an outwards directed ring of flames will be present, as known from traditional burners of a particular diameter, and in addition there will be a smaller ring of flames directed towards the centre of the burner.
- These two rings of flames are completed by a further ring of flames from the outer perimeter of the central circular chamber.
- the total flame area may be increased by at least 30 % within the same overall diameter.
- the use of the area will be further increased. This is, however, critically dependent on efficient supply of secondary air, i.e.
- the air needed for burning the gas/air mixture exiting from the inside part of the crown may be obtained by special conduits for outside air leading to the centre area of the cap. In case these are fed from the space below the hotplate, the flow of this secondary air becomes very sensitive to the opening of cupboard doors, etc.
- a further advantageous embodiment is particular in that the crown and cap define a ring-shaped chamber as well as a central circular chamber, flame openings being available on the outside perimeter, on part of the inside perimeter, and on the outside of the central circular chamber.
- the cap will be in two parts, one predominantly ring-shaped, the other a central disc. This construction allows increasing the performance of a burner of a given diameter by about 80%.
- a further advantageous embodiment is particular in that an electric ignition device is fitted in a cut-out in the crown close to the outside perimeter, said cut-out having an outwards directed flame opening directed at an angle towards the ignition device which lights the outwards directed flames and an inwards directed flame opening which lights the inwards directed flames.
- Fig. 1 it is seen how in this embodiment of the invention gas G is provided to an injector i which directs a jet of gas upwards and pulls in fresh air A from peripheral openings.
- the gas is mixed in the venturi structure constituted by the vertical part Vv and a horizontal part Vh which an expanding cross section as the gas/air mixture travels outwards between the cap Ca and the conical surface of the crown Cr.
- the gas/air mixture burns at the outside edge of the crown shown at F1 and F2 as well as at the inside at F3.
- the flames F1, F2 (which in reality is a complete circle of flames surrounding the crown Cr) use the surrounding air as the source of secondary air, and the flames F3 (which in reality form parts of a circle of flame) use air "scooped" up from the indraught of primary air by means of a scoop S.
- Fig. 2 shows the cap Ca having openings H in which the flames burn inwards towards the centre.
- Fig. 3 shows the corresponding crown Cr with e.g. milled bottoms of flame openings Fo for the outwards directed flames and Foi for the inwards directed flames. The flame openings are completely defined when the crown is closed by the cap.
- FIG. 4 is shown how the basic idea of the invention is extended in a different embodiment having an inner ring of outwards directed flames.
- Gas G is provided to an injector i which directs a jet of gas upwards and pulls in fresh air A from peripheral openings.
- the gas is mixed in the venturi structure constituted by the vertical part Vv and a horizontal part Vh which an expanding cross section as the gas/air mixture travels outwards between the cap Ca and the conical surface of the crown Cr.
- the gas/air mixture burns at the outside edge of the crown shown at F1 and F2 as well as at the inside at F3.
- gas/air mixture enters the space beneath the central cap Cac and burns with the flames F4 directed outwards from the central part of the burner.
- the flames F1, F2 (which in reality is a complete circle of flames surrounding the crown Cr) use the surrounding air as the source of secondary air, and the flames F3 (which in reality form parts of a circle of flame) as well as the flames F4 directed into the same space use air "scooped" up from the indraught of primary air by means of a scoop S.
- an electric ignition device is shown at E.
- Fig. 5 is shown the central part of the crown structure, i.e. the openings causing the flames F3 and F4.
- Fig. 6 is shown how the ignition device E functions in the burner according to the invention.
- the gas When the gas is turned on it creates a combustible gas/air mixture in the space M, and it flows out through all the flame openings, both outwards and inwards.
- I1 being directed towards the active part Ea of the ignition device which ignites the exiting gas, creating the ring of flames F1, F2.
- the other particular flame opening I2 is directed towards the inside and the gas is ignited by the first flame at I1, whereafter it ignites the inner ring F3 of flames which in their turn ignite the central ring F4.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Abstract
Description
- The invention relates to a gas hotplate burner of the kind comprising a gas nozzle fitted into the bottom part of a burner body assembly, a supply passage for primary air, preferably taking the form of a circular slit, a mixing venturi, a crown structure defining a chamber, and a cap structure providing a lid for the same.
- Burners based on the principle of a cap covering a crown being a circular array of openings for the gas mixture burning on the outside of the crown are known as is the use of a short venturi which has the advantage that the mixing takes place in a short vertical distance as opposed to the traditional long venturi. This enables a low profile of a cooker arrangement which is particularly suitable for fitting into existing cupboards without wasted space. In order to increase the power of such a burner it is necessary to supply a larger amount of gas per time unit, i.e. a larger diameter nozzle or injector for the same pressure, and this calls for more primary air in order to obtain the correct gas/air mixture. This is traditionally obtained by means of a larger supply passage for primary air. Simultaneously, it is also desirable to provide more flame openings in order to create a larger sheet of flames for heating large-diameter pots placed on the hob and this is traditionally obtained by making the diameter of the crown larger.
- It is the purpose of the invention to obtain a larger power from a gas burner with a reduced outer diameter in comparison with known burners, and in effect this means that it is desirable to utilize the area of the circle rather than the circumference as is known today.
- EP 0 534 301 A discloses a gas hotplate burner comprising a gas nozzle fitted into the bottom part of a burner body assembly, a supply passage for primary air, in the form of a circular slit, a mixing venturi, a crown structure defining a chamber, and a cap structure providing a lid for the same. The crown and cap structures define a ring-shaped chamber having flame openings on at least part of the inside perimeter as well as on the outside.
- DE 44 27 953 A discloses a gas hotplate burner of a kind similar to that disclosed in EP 0 534 301 A.
- More specifically, it is an object of the invention to further improve the use of the area defined by the burner crown and cap structures. The object is achieved by a gas hotplate burner as defined above in which the crown and cap structures further define a central circular chamber, flame openings being available on the outside perimeter of said central circular chamber.
- In a gas hotplate burner according to the invention an outwards directed ring of flames will be present, as known from traditional burners of a particular diameter, and in addition there will be a smaller ring of flames directed towards the centre of the burner. These two rings of flames are completed by a further ring of flames from the outer perimeter of the central circular chamber. By the outwards directed flames and the inwards directed flames, except for the flames from the central circular chamber, the total flame area may be increased by at least 30 % within the same overall diameter. By use of the flames from the central circular chamber the use of the area will be further increased. This is, however, critically dependent on efficient supply of secondary air, i.e. the air needed for burning the gas/air mixture exiting from the inside part of the crown. This may be obtained by special conduits for outside air leading to the centre area of the cap. In case these are fed from the space below the hotplate, the flow of this secondary air becomes very sensitive to the opening of cupboard doors, etc.
- It has turned out that an efficient construction of an improved burner providing avoiding the complication of special conduits is obtained by letting the primary air enter via the circular slit-like passage surrounding each burner and with a lower delimitation being the top surface of the hotplate and an upper delimitation constituted by a circular plate, and in that a scoop plate is provided for extracting secondary air from the stream of mainly primary air entering the slit-like passage. The term scoop plate is used for a thin structure which will divide the primary air flowing into two streams, one of which is the secondary air necessary for the combustion in the inside part of the burner. In this manner a kind of self-regulation in the supply of secondary air is obtained, because a greater pulling-in of primary air by the venturi will also provide a greater supply of secondary air. This construction has the further particular advantage that disassembly of the parts will enable complete cleaning of the top surface with the the burner body in it, without having to disassemble special conduits.
- A further advantageous embodiment is particular in that the crown and cap define a ring-shaped chamber as well as a central circular chamber, flame openings being available on the outside perimeter, on part of the inside perimeter, and on the outside of the central circular chamber. The cap will be in two parts, one predominantly ring-shaped, the other a central disc. This construction allows increasing the performance of a burner of a given diameter by about 80%.
- A further advantageous embodiment is particular in that an electric ignition device is fitted in a cut-out in the crown close to the outside perimeter, said cut-out having an outwards directed flame opening directed at an angle towards the ignition device which lights the outwards directed flames and an inwards directed flame opening which lights the inwards directed flames.
- The invention will be described in greater detail with reference to the drawings, in which
- Fig. 1 shows a cross section of a burner according to an embodiment of the invention fitted into a hotplate,
- Fig. 2 shows a cap for the burner shown in Fig. 1,
- Fig. 3 shows a crown for the burner shown in Fig. 1,
- Fig. 4 shows the cross section of a burner according to another embodiment of the invention fitted into a hotplate,
- Fig. 5 shows the crown structure for the burner shown in Fig. 5, and
- Fig. 6 shows the ignition system for a burner such as that shown in Figs. 4 and 5.
- In Fig. 1 it is seen how in this embodiment of the invention gas G is provided to an injector i which directs a jet of gas upwards and pulls in fresh air A from peripheral openings. The gas is mixed in the venturi structure constituted by the vertical part Vv and a horizontal part Vh which an expanding cross section as the gas/air mixture travels outwards between the cap Ca and the conical surface of the crown Cr. The gas/air mixture burns at the outside edge of the crown shown at F1 and F2 as well as at the inside at F3. The flames F1, F2 (which in reality is a complete circle of flames surrounding the crown Cr) use the surrounding air as the source of secondary air, and the flames F3 (which in reality form parts of a circle of flame) use air "scooped" up from the indraught of primary air by means of a scoop S.
- The components of the gas burner according to this embodiment of the invention are specifically constructed to this purpose, and Fig. 2 shows the cap Ca having openings H in which the flames burn inwards towards the centre. Fig. 3 shows the corresponding crown Cr with e.g. milled bottoms of flame openings Fo for the outwards directed flames and Foi for the inwards directed flames. The flame openings are completely defined when the crown is closed by the cap.
- In Fig. 4 is shown how the basic idea of the invention is extended in a different embodiment having an inner ring of outwards directed flames. Gas G is provided to an injector i which directs a jet of gas upwards and pulls in fresh air A from peripheral openings. The gas is mixed in the venturi structure constituted by the vertical part Vv and a horizontal part Vh which an expanding cross section as the gas/air mixture travels outwards between the cap Ca and the conical surface of the crown Cr. The gas/air mixture burns at the outside edge of the crown shown at F1 and F2 as well as at the inside at F3. Furthermore gas/air mixture enters the space beneath the central cap Cac and burns with the flames F4 directed outwards from the central part of the burner. The flames F1, F2 (which in reality is a complete circle of flames surrounding the crown Cr) use the surrounding air as the source of secondary air, and the flames F3 (which in reality form parts of a circle of flame) as well as the flames F4 directed into the same space use air "scooped" up from the indraught of primary air by means of a scoop S. In order to light the flames of the burner an electric ignition device is shown at E. In Fig. 5 is shown the central part of the crown structure, i.e. the openings causing the flames F3 and F4.
- In Fig. 6 is shown how the ignition device E functions in the burner according to the invention. When the gas is turned on it creates a combustible gas/air mixture in the space M, and it flows out through all the flame openings, both outwards and inwards. Furthermore two particular flame openings are provided, I1 being directed towards the active part Ea of the ignition device which ignites the exiting gas, creating the ring of flames F1, F2. The other particular flame opening I2 is directed towards the inside and the gas is ignited by the first flame at I1, whereafter it ignites the inner ring F3 of flames which in their turn ignite the central ring F4.
Claims (3)
- A gas hotplate burner of the kind comprising a gas nozzle (i) fitted into the bottom part of a burner body assembly, a supply passage for primary air (A), preferably taking the form of a circular slit, a mixing venturi, a crown structure (Cr) defining a chamber, and a cap structure (Ca) providing a lid for the same, wherein the crown and cap structures (Cr, Ca) define a ring-shaped chamber having flame openings on at least part of the inside perimeter as well as on the outside perimeter, characterized in that the crown and cap structures (Cr, Ca) further define a central circular chamber, flame openings being available on the outside perimeter of said central circular chamber.
- A gas hotplate burner according to claim 1, characterized in that the primary air (A) enters via the circular slit-like passage surrounding each burner and with a lower delimitation being the top surface of the hotplate and an upper delimitation constituted by a circular plate, and in that a sccoop plate (S) is provided for extracting secondary air from the stream of mainly primary air entering the slit-like passage.
- A gas hotplate burner according to claim 1, characterized in that an electric ignition device (E) is fitted in a cut-out in the crown close to the outside perimeter, said cut-out having an outwards directed flame opening (I1) directed at an angle towards the ignition device which lights the outwards directed flames and an inwards directed flame opening (I2) which lights the inwards directed flames.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DK1997/000353 WO1999011975A1 (en) | 1997-08-28 | 1997-08-28 | A gas hotplate burner |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1025392A1 EP1025392A1 (en) | 2000-08-09 |
EP1025392B1 true EP1025392B1 (en) | 2003-09-10 |
Family
ID=8156209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97936624A Expired - Lifetime EP1025392B1 (en) | 1997-08-28 | 1997-08-28 | A gas hotplate burner |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1025392B1 (en) |
AU (1) | AU3939497A (en) |
DE (1) | DE69724838D1 (en) |
ES (1) | ES2206744T3 (en) |
WO (1) | WO1999011975A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108266728A (en) * | 2017-01-03 | 2018-07-10 | 广东星立方厨电集团有限公司 | A kind of opposite cooker burner of inner ring and outer rings airintake direction |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1315325B1 (en) * | 2000-04-28 | 2003-02-10 | Paolo Moresco | GAS BURNER FOR HOB |
IT1318126B1 (en) * | 2000-07-06 | 2003-07-23 | Sabaf Spa | BURNER WITH INTERNAL SEPARATOR |
ITVE20010043A1 (en) * | 2001-10-24 | 2003-04-24 | Ohg Defendi S R L | GAS BURNER WITH SEVERAL FLAME SECTORS |
ITPS20030015A1 (en) * | 2003-04-18 | 2004-10-19 | So M I Press Societa Metalli I Niettati Spa | BURNER FOR GAS STOVES, OF THE PERFECT TYPE. |
ITUD20030137A1 (en) * | 2003-06-23 | 2004-12-24 | Sami Srl | TRIPLE CROWN BURNER. |
FR2858393B1 (en) * | 2003-07-31 | 2005-09-30 | Lemdys | RECEPTACLE FOR INTERNAL FLAME GAS BURNER AND COOKING ASSEMBLY COMPRISING SUCH RECEPTACLE AND BURNER |
ES1056041Y (en) * | 2003-11-11 | 2004-06-01 | Fagor S Coop | TRIPLE CROWN GAS BURNER FOR COOKING PLATES. |
ES2375855B1 (en) * | 2009-01-26 | 2012-10-10 | Butsir S.L | DOUBLE GAS BURNER. |
CN102128451B (en) * | 2011-03-28 | 2013-04-24 | 浙江优格厨电有限公司 | Stove burner |
CN104154537B (en) * | 2014-08-07 | 2016-08-24 | 湖南省特种设备检验检测研究院娄底分院 | Oxygen gas swirl combustion device is joined in a kind of front end |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH499751A (en) * | 1967-11-27 | 1970-11-30 | Menalux S A | Process for preventing the external burners of a built-in gas cooker from going out and equipment for carrying out the process |
GB2223302A (en) * | 1988-09-28 | 1990-04-04 | Tiao Ho Yen | Gas burner |
IT1250838B (en) * | 1991-09-26 | 1995-04-21 | Merloni Elettrodomestici Spa | GAS BURNER. |
DE4427953A1 (en) * | 1994-08-06 | 1996-02-08 | Ruhrgas Ag | Gas burner for gas cooker |
-
1997
- 1997-08-28 WO PCT/DK1997/000353 patent/WO1999011975A1/en active IP Right Grant
- 1997-08-28 DE DE69724838T patent/DE69724838D1/en not_active Expired - Lifetime
- 1997-08-28 ES ES97936624T patent/ES2206744T3/en not_active Expired - Lifetime
- 1997-08-28 EP EP97936624A patent/EP1025392B1/en not_active Expired - Lifetime
- 1997-08-28 AU AU39394/97A patent/AU3939497A/en not_active Abandoned
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108266728A (en) * | 2017-01-03 | 2018-07-10 | 广东星立方厨电集团有限公司 | A kind of opposite cooker burner of inner ring and outer rings airintake direction |
CN108266728B (en) * | 2017-01-03 | 2020-06-12 | 广东星立方厨电集团有限公司 | Stove burner with opposite air inlet directions of inner ring and outer ring |
Also Published As
Publication number | Publication date |
---|---|
ES2206744T3 (en) | 2004-05-16 |
DE69724838D1 (en) | 2003-10-16 |
EP1025392A1 (en) | 2000-08-09 |
WO1999011975A1 (en) | 1999-03-11 |
AU3939497A (en) | 1999-03-22 |
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