EP0563376A1 - Gaz blowing plate brick or nozzle brick for molten metal - Google Patents
Gaz blowing plate brick or nozzle brick for molten metal Download PDFInfo
- Publication number
- EP0563376A1 EP0563376A1 EP89906468A EP89906468A EP0563376A1 EP 0563376 A1 EP0563376 A1 EP 0563376A1 EP 89906468 A EP89906468 A EP 89906468A EP 89906468 A EP89906468 A EP 89906468A EP 0563376 A1 EP0563376 A1 EP 0563376A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- brick
- nozzle
- molten metal
- pipes
- gas
- 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.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
- B22D41/42—Features relating to gas injection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
Definitions
- This invention relates to an inert gas injecting plate brick or nozzle brick for use in a sliding gate valve apparatus (or discharge regulator) of molten metal.
- the molten metal received at a ladle is poured into a mold through a tundish.
- a certain amount of molten metal is kept stored within the tundish before starting the pouring of the molten metal into the mold at the beginning of casting, and after the flowing-up of impurities a nozzle is opened to start a pouring. This procedure is called a closed start, and these days this technique has begun to be introduced.
- a gas injecting ring in which a gas injecting ring is arranged, said ring having a plurality of small radial orifices provided toward the slide plate side from a groove formed along the outer periphery within the opening of a bottom plate brick to the center of the opening.
- the inventors of this invention have made extensive studies and researches to solve the various problems innate in the known systems, and as the result, they have been successful in developing a novel inert gas injecting plate brick or nozzle brick for use in a sliding gate valve apparatus of molten metal, which brick is of quite different idea from the known systems.
- the present invention is technically constituted such that a plate brick or nozzle brick for use in an apparatus of discharging molten metal is split into at least two parts horizontally, and said split surfaces are provided with a number of small diameter pipes (2) in the sealed state, and said pipes are secured to said split surface.
- Fig. 1 shows an embodiment in which the present invention is applied to a bottom plate brick.
- said plate brick is split into bricks 3 and 4, a number of small diameter pipes 2 each having a connecting port 1 to the gas source are involved and arranged in the jointing surfaces of said split bricks 3 and 4, and gas injecting openings 5 of said small diameter pipes 2 in group communicate with the melt passing hole.
- Fig. 2 is similar in construction to Fig. 1, and it is an embodiment in which the gas injecting direction of the small diameter pipe 2 is brought close to the normal direction of the outer periphery of the melt passing hole.
- Fig. 2 is similar to Fig. 1 in other constitution.
- Fig. 3a is a plan view showing an assembling mode of the group of said small diameter pipes 2
- Fig. 3b shows a sectional view of the group of said small diameter pipes 2 in the bound state.
- Fig. 4 is an embodiment in which the present invention is applied to an insert nozzle brick.
- the insert nozzle brick is split into bricks 3 and 4, a group of the small diameter pipes 2 are involved and arranged, similarly to the above, in the split surfaces, and gas injecting openings 5 communicate with the melt passing hole.
- Fig. 5 shows an embodiment in which the invention is applied to an immersion nozle 8.
- a through hole is provided in the nozzle body and the small diameter pipes 2 in group are arranged in said holes.
- Fig. 6 is a sectional view where respective parts in the embodiment of Fig. 1 are separately shown thereby to exemplify their arranging relationship.
- Fig. 7 shows an embodiment in which the insert nozzle brick is split into three parts (3, 3' and 4), and the gas injecting openings 5 are disposed in two rows of upward and horizontal directions in the melt passing hole.
- Fig. 8 shows an embodiment in which similarly, the insert nozzle brick is split into three parts (3, 3' and 4), and the injecting openings 5 are disposed also in two rows up and down.
- a plate brick or a nozzle brick which is used in a sliding gate valve apparatus of molten metal is split into two or more parts, several slender stainless or copper pipes are arranged in the split surfaces toward the nozzle opening, and thereafter the split plate bricks or nozzle bricks are adhered with mortar or the like.
Abstract
Description
- This invention relates to an inert gas injecting plate brick or nozzle brick for use in a sliding gate valve apparatus (or discharge regulator) of molten metal.
- In a continuous casting installation, the molten metal received at a ladle is poured into a mold through a tundish. At such a time, a certain amount of molten metal is kept stored within the tundish before starting the pouring of the molten metal into the mold at the beginning of casting, and after the flowing-up of impurities a nozzle is opened to start a pouring. This procedure is called a closed start, and these days this technique has begun to be introduced.
- In the closed starting of a continuous casting tundish various systems have been proposed for injecting an inert gas to prevent the molten metal from solidification within the nozzle while storing the molten metal in the tundish by closing the nozzle hole of a sliding gate valve. For example, there are known a sliding gate valve apparatus of molten metal (Patent Kokai No. 20659/86) in which a plurality of gas feeding holes communicating with the melt passing hole of the bottom plate brick of the sliding gate valve apparatus are provided and said gas feeding part are made of porous refractory, and a system (shown in Fig. 9 - Patent Kokai No. 177952/85) in which a gas injecting ring is arranged, said ring having a plurality of small radial orifices provided toward the slide plate side from a groove formed along the outer periphery within the opening of a bottom plate brick to the center of the opening.
- Said known systems have the following drawbacks:
- (a) The gas guiding pipe (made of copper or steel) is connected and sealed with the gas feeding holes (made of brick bored with fine orifices) by means of sealing material, mortar or soldering, and in the high temperature condition the gas sometimes leaks (shown with x marks in Fig. 9) from the joints so as not to be injected into the nozzle opening.
Further, practically the gas amount injected into the nozzle opening becomes irregular so that stable casting is often not operated whereby the products and quality are not uniform. - (b) The making process requires additional working such as a cutting processing of brick, a boring processing of brick, and a jointing working of the gas guiding pipe and the gas injecting brick thereby to demand high cost.
- The inventors of this invention have made extensive studies and researches to solve the various problems innate in the known systems, and as the result, they have been successful in developing a novel inert gas injecting plate brick or nozzle brick for use in a sliding gate valve apparatus of molten metal, which brick is of quite different idea from the known systems.
- The present invention is technically constituted such that a plate brick or nozzle brick for use in an apparatus of discharging molten metal is split into at least two parts horizontally, and said split surfaces are provided with a number of small diameter pipes (2) in the sealed state, and said pipes are secured to said split surface. By means of such technical constitution it is possible to achieve the undermentioned function and effect.
- (a) The gas passing route where gas is likely to leak and where the temperature is likely to rise in the vicinity of the nozzle opening, is made in one body without joints so that the gas does not leak out, and therefore, the whole gas as fed is injected into the nozzle opening.
- (b) After the formation of the plate brick or nozzle brick by pressing, the additional working such as cutting processing or boring processing is no longer required, so that cost decreases.
-
- Fig. 1 shows one embodiment of the invention, in which the gas guiding pipes are incorporated in the normal direction of and obliquely downward to the nozzle opening of the plate brick;
- Fig. la is a partly notched plan view;
- Fig. 1b is a vertical sectional view taken along the A-A line of Fig. la;
- Fig. 2a and Fig. 2b are also a plan view and a vertical sectional view, similar to Fig. 1, which show a different embodiment of the invention, in which the gas guiding pipes are incorporated in the normal direction of and obliquely downward to the nozzle opening of the plate brick;
- Fig. 3a and Fig. 3b show an embodiment of the gas guiding pipes (in the case of plurality) which are incorporated in the brick, and Fig. 3b is a sectional view taken along the A-A line of Fig. 3a;
- Fig. 4a and 4b show an embodiment in which the gas guiding pipes are incorporated in an insert nozzle brick, and Fig. 4a is a vertical sectional view while Fig. 4b is a lateral sectional view taken along the A-A line of Fig. 4a;
- Fig. 5 is a vertical sectional view which shows an embodiment where a gas guiding pipe is applied to an immersion nozzle;
- Fig. 6 is a partly sectional side view showing the respective members in the embodiment of Fig. 1;
- Fig. 7a and Fig. 7b are views, similar to Fig. 4, of an example of three-split type, where the present invention is applied to the insert nozzle brick;
- Fig. 8 is a vertical sectional view of an embodiment of three-split type, where the invention is applied to the plate brick; and
- Fig. 9 is a vertical sectional view of a bottom plate brick for the injection of inert gas of known system.
- The invention will now be described more in detail, by way of embodiment, with reference to the accompanying drawings.
- Fig. 1 shows an embodiment in which the present invention is applied to a bottom plate brick. As shown, said plate brick is split into
bricks small diameter pipes 2 each having a connectingport 1 to the gas source are involved and arranged in the jointing surfaces of said splitbricks openings 5 of saidsmall diameter pipes 2 in group communicate with the melt passing hole. - Fig. 2 is similar in construction to Fig. 1, and it is an embodiment in which the gas injecting direction of the
small diameter pipe 2 is brought close to the normal direction of the outer periphery of the melt passing hole. Fig. 2 is similar to Fig. 1 in other constitution. - Fig. 3a is a plan view showing an assembling mode of the group of said
small diameter pipes 2, and Fig. 3b shows a sectional view of the group of saidsmall diameter pipes 2 in the bound state. - Fig. 4 is an embodiment in which the present invention is applied to an insert nozzle brick. In this embodiment, the insert nozzle brick is split into
bricks small diameter pipes 2 are involved and arranged, similarly to the above, in the split surfaces, and gas injectingopenings 5 communicate with the melt passing hole. - Fig. 5 shows an embodiment in which the invention is applied to an
immersion nozle 8. In this embodiment, a through hole is provided in the nozzle body and thesmall diameter pipes 2 in group are arranged in said holes. - Fig. 6 is a sectional view where respective parts in the embodiment of Fig. 1 are separately shown thereby to exemplify their arranging relationship.
- Fig. 7 shows an embodiment in which the insert nozzle brick is split into three parts (3, 3' and 4), and the gas injecting
openings 5 are disposed in two rows of upward and horizontal directions in the melt passing hole. - Fig. 8 shows an embodiment in which similarly, the insert nozzle brick is split into three parts (3, 3' and 4), and the injecting
openings 5 are disposed also in two rows up and down. - A plate brick or a nozzle brick which is used in a sliding gate valve apparatus of molten metal is split into two or more parts, several slender stainless or copper pipes are arranged in the split surfaces toward the nozzle opening, and thereafter the split plate bricks or nozzle bricks are adhered with mortar or the like.
- 1) One of the two split bricks is press formed by providing
grooves 10 for embedding the pipes. The brick material is the high alumina or alumina carbonaceous one which is generally used as plate brick or nozzle brick. Additionally, in the case of pipes the outside diameter of which is more thin than the mortar joint, it is unnecessary particularly to provide grooves for embedding the pipes. - 2) The other of the two split bricks is not provided with the grooves for embedding the pipes, and it consists of a press formed article or a casting material. The material is the same as in 1) above.
- 3) For making a gas guiding pipe, a copper or stainless pipe of about 0.2 - 3.00 mm inside diameter is bend worked in advance to meet the shape of the groove of the brick. In the case of a plurality of pipes, they are assembled in a single pipe by soldering or the like and a nipple for connection is secured to the tip of said assembled pipe.
- 4) In the case of a plurality of pipes, the inside diameter, length and securing position of each of the pipes are varied in consideration of the pressure loss caused by the difference of the lengths of the respective pipes, so that the gas may be injected uniformly into the nozzle hole.
- 5) In order that the pressure loss of the pipes is decreased, the inside diameter of the pipes is made larger except the gas injecting port portions of the pipe. Further, in case the pipes are two or more, they are combined and connected to a single larger pipe whereby the pressure loss is decreased (see Fig. 3).
-
- (1) Since the inert gas fed into the pipes passes through a jointless piping so as to be injected into the nozzle hole, the gas cannot be leaked and it is possible to feed the gas in a certain amount.
In known techniques, for example, a cylindrical brick bored with fine orifices was set to a plate brick and a metallic pipe was connected to the gas reservoir provided therebetween. However, gas leakage could not be prevented being affected by the heat generated from the molten metal when casting. - (2) Since the plate brick itself does not form a part of the gas passing route it is unnecessary that the brick is machine worked to form a gas passage there. Because of this, the brick as press formed can be used as it is to allow the manufacturing process to be simplified. This leads to a cost lowering.
- (3) By varying the size, number, position and angle of the pipes it is possible to easily manufacture bricks of the constructions suited for closed start and blocking prevention respectively.
Claims (5)
- An inert gas injecting plate brick or nozzle brick for use in a sliding gate valve apparatus of molten metal, characterised in that said plate brick or nozzle brick is horizontally split into at least two parts, and a number of small diameter pipes are sealingly arranged and secured in said split surfaces.
- An inert gas injecting plate brick or nozzle brick for use in a sliding gate valve apparatus of molten metal as described in Claim 1 wherein said small diameter pipes are bundled in a plurality of groups, and each group of the pipes is communicated with a gas passing portion.
- An inert gas injecting plate brick or nozzle brick for use in a sliding gate valve apparatus of molten metal as described in Claim 1 or Claim 2 wherein said small diameter pipes are disposed either in the direction between the normal and the tangent to the nozzle opening or obliquely above and down the nozzle opening or in combination of both the disposition.
- An inert gas injecting plate brick or nozzle brick for use in a sliding gate valve apparatus of molten metal as described in any of Claims 1 to 3 wherein said small diameter pipes are made of metal or ceramic.
- An inert gas injecting plate brick or nozzle brick for use in a sliding gate valve apparatus of molten metal as described in any of Claims 1 to 4 wherein said plate brick or said nozzle brick is bored with at least one through hole, and said through hales are provided with small diameter pipes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1989/000551 WO1990014908A1 (en) | 1989-06-01 | 1989-06-01 | Gaz blowing plate brick or nozzle brick for molten metal |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0563376A4 EP0563376A4 (en) | 1993-01-09 |
EP0563376A1 true EP0563376A1 (en) | 1993-10-06 |
EP0563376B1 EP0563376B1 (en) | 1997-03-05 |
Family
ID=13958702
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89906468A Expired - Lifetime EP0563376B1 (en) | 1989-06-01 | 1989-06-01 | Gaz blowing plate brick or nozzle brick for molten metal |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0563376B1 (en) |
KR (1) | KR960005885B1 (en) |
AU (1) | AU652916B2 (en) |
BR (1) | BR8907894A (en) |
DE (1) | DE68927834T2 (en) |
WO (1) | WO1990014908A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2683753A1 (en) * | 1991-11-19 | 1993-05-21 | Stopinc Ag | SHUTTER PLATE FOR A DRAWER SHUTTER OF A TANK CONTAINING A BATH OF MOLTEN METAL. |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019206018A (en) * | 2018-05-29 | 2019-12-05 | 日本製鉄株式会社 | Method for feeding molten steel |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2227073A1 (en) * | 1973-04-27 | 1974-11-22 | Didier Werke Ag | |
FR2334452A1 (en) * | 1975-12-09 | 1977-07-08 | Kloeckner Werke Ag | Bottom pour ladle fitted with porous insulating pipe - surrounding outlet stream of steel and filled with argon |
FR2407772A1 (en) * | 1977-11-04 | 1979-06-01 | Korf Stahl | PROCESS FOR THE CONTINUOUS CASTING OF A METAL, IN PARTICULAR STEEL AND INSTALLATION FOR CARRYING OUT THIS PROCESS |
EP0080997A1 (en) * | 1981-11-27 | 1983-06-08 | Manfred Dipl.-Ing. Haissig | Device for the continuous casting of metals |
AT383529B (en) * | 1985-10-24 | 1987-07-10 | Voest Alpine Ag | Arrangement for pouring melts |
JPS63154247A (en) * | 1986-12-16 | 1988-06-27 | Kawasaki Refract Co Ltd | Sliding nozzle plate |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53123336A (en) * | 1977-04-04 | 1978-10-27 | Nippon Steel Corp | Rectifier method of molten steel pouring |
JPS61195734A (en) * | 1985-02-26 | 1986-08-30 | Nippon Kokan Kk <Nkk> | Nozzle for manufacturing composite matte |
US4756452A (en) * | 1986-11-13 | 1988-07-12 | Shinagawa Refractories Co., Ltd. | Molten metal pouring nozzle |
-
1989
- 1989-06-01 AU AU37468/89A patent/AU652916B2/en not_active Ceased
- 1989-06-01 EP EP89906468A patent/EP0563376B1/en not_active Expired - Lifetime
- 1989-06-01 BR BR898907894A patent/BR8907894A/en not_active IP Right Cessation
- 1989-06-01 WO PCT/JP1989/000551 patent/WO1990014908A1/en active IP Right Grant
- 1989-06-01 DE DE68927834T patent/DE68927834T2/en not_active Expired - Fee Related
- 1989-06-01 KR KR1019910701740A patent/KR960005885B1/en not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2227073A1 (en) * | 1973-04-27 | 1974-11-22 | Didier Werke Ag | |
FR2334452A1 (en) * | 1975-12-09 | 1977-07-08 | Kloeckner Werke Ag | Bottom pour ladle fitted with porous insulating pipe - surrounding outlet stream of steel and filled with argon |
FR2407772A1 (en) * | 1977-11-04 | 1979-06-01 | Korf Stahl | PROCESS FOR THE CONTINUOUS CASTING OF A METAL, IN PARTICULAR STEEL AND INSTALLATION FOR CARRYING OUT THIS PROCESS |
EP0080997A1 (en) * | 1981-11-27 | 1983-06-08 | Manfred Dipl.-Ing. Haissig | Device for the continuous casting of metals |
AT383529B (en) * | 1985-10-24 | 1987-07-10 | Voest Alpine Ag | Arrangement for pouring melts |
JPS63154247A (en) * | 1986-12-16 | 1988-06-27 | Kawasaki Refract Co Ltd | Sliding nozzle plate |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN, vol. 12, no. 416 (M-759)(3263), 4th November 1988; & JP-A-63 154 247 (KAWASAKI) 27-06-1988 * |
See also references of WO9014908A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2683753A1 (en) * | 1991-11-19 | 1993-05-21 | Stopinc Ag | SHUTTER PLATE FOR A DRAWER SHUTTER OF A TANK CONTAINING A BATH OF MOLTEN METAL. |
Also Published As
Publication number | Publication date |
---|---|
DE68927834T2 (en) | 1997-10-02 |
AU652916B2 (en) | 1994-09-15 |
WO1990014908A1 (en) | 1990-12-13 |
AU3746889A (en) | 1991-01-07 |
KR960005885B1 (en) | 1996-05-03 |
EP0563376A4 (en) | 1993-01-09 |
DE68927834D1 (en) | 1997-04-10 |
EP0563376B1 (en) | 1997-03-05 |
BR8907894A (en) | 1992-04-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR960015336B1 (en) | Casting spout for metallurgical vessels | |
US4708327A (en) | Discharge nozzle assembly and methods of formation and operation thereof | |
US4421257A (en) | Metal pouring nozzle with gas inlet | |
KR890002116B1 (en) | Molten metal discharging device | |
US4091971A (en) | Molten metal nozzle having capillary gas feed | |
EP1401600B1 (en) | Stopper for reliable gas injection | |
JPH079097A (en) | Immersion nozzle | |
EP0370095B1 (en) | Ladle shroud with co-pressed gas permeable ring | |
EP0281267B1 (en) | Devices and apparatus for injecting gas into high temperature liquids, e.g. molten metals | |
AU2002315577A1 (en) | Stopper for reliable gas injection | |
EP0563376A1 (en) | Gaz blowing plate brick or nozzle brick for molten metal | |
US5613545A (en) | Inert gas injecting plate brick or insert nozzle brick for use in a sliding gate valve apparatus of molten metal | |
US5284278A (en) | Shut off plate assembly for slide gate | |
EP0509699A1 (en) | Gas permeable well nozzle | |
JPH0744364Y2 (en) | Upper nozzle for gas blowing used in molten metal discharge device | |
EP0712341A1 (en) | Method and device for unplugging a molten metal discharge port | |
CA2245668C (en) | Gas-flushing base for metallurgical vessels | |
JPH0435003Y2 (en) | ||
JP4145164B2 (en) | Sliding gate plate | |
EP0150549A1 (en) | Nozzle for continuous casting | |
JPH11510098A (en) | Gas intrusion control device for continuous casting machine | |
JPS6195757A (en) | Immersion nozzle for continuous casting | |
WO2002047846A2 (en) | Casting nozzle with gas injection means | |
JPH0433772A (en) | Sliding nozzle device having gas blowing mechanism | |
CA2158065A1 (en) | Improvements in molten metal handling vessels |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19911202 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE FR GB IT |
|
17Q | First examination report despatched |
Effective date: 19940503 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE FR GB IT |
|
REF | Corresponds to: |
Ref document number: 68927834 Country of ref document: DE Date of ref document: 19970410 |
|
ET | Fr: translation filed | ||
ITF | It: translation for a ep patent filed |
Owner name: UFFICIO TECNICO ING. A. MANNUCCI |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19980528 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19980617 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19980623 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19980730 Year of fee payment: 10 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990601 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19990630 Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990630 |
|
BERE | Be: lapsed |
Owner name: SHINAGAWA REFRACTORIES CO. LTD Effective date: 19990630 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19990601 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000503 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050601 |