EP0150755B1 - Verfahren und Vorrichtung zur Herstellung von Metallpulver - Google Patents

Verfahren und Vorrichtung zur Herstellung von Metallpulver Download PDF

Info

Publication number
EP0150755B1
EP0150755B1 EP85100339A EP85100339A EP0150755B1 EP 0150755 B1 EP0150755 B1 EP 0150755B1 EP 85100339 A EP85100339 A EP 85100339A EP 85100339 A EP85100339 A EP 85100339A EP 0150755 B1 EP0150755 B1 EP 0150755B1
Authority
EP
European Patent Office
Prior art keywords
metal
gas
passage
riser
molten metal
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
Application number
EP85100339A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0150755A3 (en
EP0150755A2 (de
Inventor
Joseph M. Wentzell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nyby Uddeholm Powder AB
Original Assignee
Nyby Uddeholm Powder AB
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 Nyby Uddeholm Powder AB filed Critical Nyby Uddeholm Powder AB
Publication of EP0150755A2 publication Critical patent/EP0150755A2/de
Publication of EP0150755A3 publication Critical patent/EP0150755A3/de
Application granted granted Critical
Publication of EP0150755B1 publication Critical patent/EP0150755B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid

Definitions

  • the invention relates to a method and a device for producing metal powder by atomizing a molten metal from a riser pipe according to the preamble of claim 1 and claim 6, respectively.
  • the present invention is therefore based on the object of creating a method and a device of the type mentioned or described in GB-A 1 194 444, by means of which the finest metal powder of high uniformity with minimal construction, process engineering and energy expenditure Quality can be produced.
  • the starting point for the production of metal powder is a metal or metal-alloy melt, the entire production process taking place in a closed space, preferably in an inert gas environment, in particular in an argon environment.
  • the metal powder produced by the method according to the invention or by the device according to the invention is characterized by the highest degree of homogeneity, both with regard to the composition, the structure and the shape and size of the metal particles.
  • the molten metal is preferably mixed with inert gas to form a metal foam which is “blasted” or divided into fine metal droplets in a pulverization chamber by exposure to likewise inert compressed gas.
  • the inert pressurized gas preferably argon, also serves to press the metal droplets out of the pulverization chamber into a closed expansion space, namely a collecting container, through a mouthpiece that preferably converges in the flow direction, so that a so-called secondary division of the metal droplets into even finer, full-density particles takes place.
  • the possibly existing hollow or hollowed-out metal droplets burst during the secondary distribution.
  • the metal droplets are torn apart by the high acceleration in the converging mouthpiece. The finest, fully dense metal powder settles in the expansion space or collection container, in which the pressure is much lower than in the upstream pulverization chamber. Objects of the highest dimensional stability can be produced from this metal powder.
  • metal also includes metal alloys, in particular stainless steel alloys and super alloys.
  • the external compressed gas flow in the area of the passage from the pulverizing chamber to the expansion space or collecting container causes the metal particles to experience a high acceleration similar to that caused by the converging mouthpiece Claim 7, wherein both measures can be combined with the advantage that the acceleration in the area of the passage mentioned by the external "acceleration flow” can be varied depending on the desired degree of secondary division.
  • the external pressure gas flow in the region of the passage from the pulverization chamber to the collecting container is preferably a flow which is approximately uniform across the circumference of the passage and is approximately parallel to the wall.
  • Inert gas, in particular argon preferably also serves as the compressed gas.
  • a crucible 3 for receiving a metal or metal-alloy melt is arranged in a gas-tight, closed receiving container 2, which stands on a stable base. Above the crucible 3 there is a riser pipe 7 led out of the receptacle 2.
  • the crucible 3 can be raised within the receptacle 2 by means of a hydraulically or hydro-pneumatically or mechanically driven device so that the riser pipe 7 is immersed in the molten metal.
  • the lifting device 5 is connected to a lifting table 4 on which the crucible 3 is fastened.
  • the riser pipe 7 is closed with a cap-like cover 7a, which is when the riser pipe is immersed res 7 is destroyed in the molten metal.
  • a device 6 for generating the required heat of fusion is assigned to the crucible 3; in the illustrated embodiment, an induction coil of known type, the electrical connections of which are led out of the receptacle 2 (plug connection 21).
  • a gas pressure line 11 opens into the receptacle 2, the mouth opening being identified by the reference number 12.
  • Gas, in particular inert gas, for example argon can be introduced into the receiving container through the gas pressure line 11, with the formation of an internal container pressure which pushes the molten metal in the riser pipe 7 upwards when it is immersed in the molten metal.
  • the gas pressure in the interior of the receptacle 2 acts on the free surface of the molten metal.
  • the receptacle 2 is provided with a safety valve 19.
  • the riser pipe 7 is led out of the receptacle 2 through a sleeve 14 arranged in the cover of the receptacle 2, the inside diameter of the sleeve 14 being larger than the outside diameter of the riser pipe 7 and the resulting annular space 23 between the riser pipe 7 and the sleeve 14 relative to the interior of the receptacle 2 on the one hand (ring seal 21) and the external environment on the other hand (ring seal 22) is sealed.
  • a gas pressure line 13 opens into the annular space 23, through which an inert gas, preferably argon, can be mixed into the annular space 23 and from there through an opening 15 in the riser pipe 7 of the molten metal rising in the riser pipe (with a correspondingly high gas pressure inside the receptacle 2). so that the molten metal leaves the riser pipe as a metal foam.
  • the annular space 23 serves as a gas calming zone.
  • a so-called pulverization chamber 8 is connected to the upper end of the riser pipe 7, which is already outside the receptacle 2 and into which inert gas, namely argon, can also be blown in under high pressure through an opening 18. Similar to the upper part of the riser pipe 7, the pulverization chamber 8 is surrounded by an annular space 16 which is sealed off from the external environment and into which a gas pressure line 17 opens.
  • the gas pressure lines 11, 13 and 17 each have gas pressure regulating valves 20, so that the pressure of the gas introduced through these lines can be individually matched to one another.
  • the metal foam By introducing non-reactive or inert compressed gas into the pulverization chamber 8, the metal foam is atomized or broken down into - to a small extent sometimes also hollow - metal droplets which are still relatively large.
  • the compressed gas introduced into the pulverization chamber 8 also serves to blow the metal droplets through a converging passage 9 into an expansion space, that is to say a space of low pressure, namely a closed collecting container 10, with the formation of the finest, fully dense metal powder.
  • the converging narrowing of the passage 9 and the acceleration of the gas-metal droplet flow from the pulverizing chamber 8 into the collecting container 10 which is achieved in this way are of very important importance. As has been explained above, this acceleration can also be achieved by an external ring flow.
  • the convergingly narrowing passage 9 is directed obliquely upwards at an angle a of approximately 45 ° with respect to the horizontal.
  • the longitudinal axis of the passage 9 coincides with the longitudinal axis of the pulverization chamber 8.
  • the converging passage 9 can be designed as an interchangeable mouthpiece, so that depending on the selected gas pressures and the metal alloy used, differently converging passages 9 can be used as a corresponding one Mouthpiece can be selected. If the acceleration in passage 9 occurs through the mentioned external ring flow, the degree of acceleration can be changed by corresponding action on this ring flow. Both measures are then preferably used, namely an outer ring flow and a converging mouthpiece, as a result of which a replacement of the mouthpiece with a corresponding change in the outer ring flow can be unnecessary.
  • the mouthpiece can also be arranged so that it can be pivoted so that the optimum angle a can be set individually.
  • the melting crucible 3 filled with molten metal is first arranged on the lifting table 4 within the induction coil 6.
  • the induction coil 6 ensures that the metal in the crucible 3 remains in the molten state.
  • the receptacle 2 is then sealed gas-tight and filled with argon via the gas pressure line 11 and opening 12.
  • the lifting table 5 and thus the crucible 3 with the melt are raised so far by means of the lifting device 5 that the riser pipe 7 dips into the molten metal with its lower end, as a result of which the covering cap 7a is destroyed. Due to the gas pressure in the interior of the receptacle 2, which acts on the free surface of the melt, the melt is pressed upwards by the riser pipe 7.
  • a non-reactive gas via the line 13, the annular space 23 and the opening 15 in the upper region of the riser pipe 7 of the ascending molten metal, like argon, mixed in, which creates metal foam.
  • the gas is blown into the pulverization chamber 8 and the metal droplets are simultaneously blown through the converging passage 9 into a collecting container 10 to form the finest fully dense metal particles.
  • the hollow or hollowed-out metal droplets which may arise in the chamber 8 literally burst open in the passage 9 and disintegrate into the finest metal particles due to partial pressure differences inside and outside the metal droplet cavities.
  • the collecting container 10 is sealed gas-tight from the environment.
  • the converging, narrowing passage is very important for the fine atomization. Due to the converging passage, gas consumption can also be significantly reduced.
  • the converging narrowing passage 9 thus results in a further or secondary division of the metal droplets formed in the pulverization chamber 8, due to the acceleration and acceleration forces which act on the metal droplets in the passage 9.
  • the aforementioned partial pressure differences also arise in the region of the convergingly narrowing passage 9, which cause any hollow metal droplets which may be present to burst open and further crush the same. This effect is also achieved with comparatively low gas consumption.
  • the convergence of the passage 9 determines the pressure in the pulverization chamber 8 as well as the acceleration of the metal droplets and the resulting breakup forces, the degree of convergence depending on the metal to be pulverized (MetalV metal alloy) and the desired particle size.

Landscapes

  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Disintegrating Or Milling (AREA)
  • Powder Metallurgy (AREA)
  • Float Valves (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Conductive Materials (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Stored Programmes (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Burglar Alarm Systems (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
EP85100339A 1984-01-25 1985-01-15 Verfahren und Vorrichtung zur Herstellung von Metallpulver Expired EP0150755B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3402500 1984-01-25
DE3402500A DE3402500C1 (de) 1984-01-25 1984-01-25 Verfahren und Vorrichtung zur Herstellung von Metallpulver

Publications (3)

Publication Number Publication Date
EP0150755A2 EP0150755A2 (de) 1985-08-07
EP0150755A3 EP0150755A3 (en) 1987-02-25
EP0150755B1 true EP0150755B1 (de) 1989-08-30

Family

ID=6225866

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85100339A Expired EP0150755B1 (de) 1984-01-25 1985-01-15 Verfahren und Vorrichtung zur Herstellung von Metallpulver

Country Status (22)

Country Link
US (1) US4610719A (es)
EP (1) EP0150755B1 (es)
JP (1) JPS60221507A (es)
KR (1) KR900009217B1 (es)
AT (1) ATE45897T1 (es)
AU (1) AU575518B2 (es)
BR (1) BR8500319A (es)
CA (1) CA1228458A (es)
CS (1) CS273161B2 (es)
DD (1) DD232212A5 (es)
DE (2) DE3402500C1 (es)
DK (1) DK161571C (es)
ES (1) ES8608975A1 (es)
FI (1) FI76716C (es)
IL (1) IL74135A (es)
IN (1) IN163942B (es)
MX (1) MX162212A (es)
NO (1) NO164220C (es)
PL (1) PL143335B1 (es)
PT (1) PT79874B (es)
RO (1) RO91979B (es)
SU (1) SU1563584A3 (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4019563A1 (de) * 1990-06-15 1991-12-19 Mannesmann Ag Verfahren zur herstellung von metallpulver
DE10205897A1 (de) * 2002-02-13 2003-08-21 Mepura Metallpulver Verfahren zur Herstellung von partikelförmigem Material

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626278A (en) * 1984-07-26 1986-12-02 Kenney George B Tandem atomization method for ultra-fine metal powder
DE3622123A1 (de) * 1986-07-02 1988-01-21 Dornier System Gmbh Verfahren und vorrichtung zur herstellung von verbundpulvern
US4768577A (en) * 1986-10-07 1988-09-06 The United States Of America As Represented By The Department Of Energy Dissolution of inert gas in a metal alloy
US4810288A (en) * 1987-09-01 1989-03-07 United Technologies Corporation Method and apparatus for making metal powder
US4808218A (en) * 1987-09-04 1989-02-28 United Technologies Corporation Method and apparatus for making metal powder
US4793853A (en) * 1988-02-09 1988-12-27 Kale Sadashiv S Apparatus and method for forming metal powders
KR100387565B1 (ko) * 1998-04-13 2003-10-10 안정오 파장전사체의제법
JP5219125B2 (ja) * 2008-01-23 2013-06-26 宇宙 宮尾 マグネシウム粒子製造装置
CN106392090A (zh) * 2016-12-21 2017-02-15 重庆市万盛区顺达粉末冶金有限公司 一种用于粉末冶金的制粉系统
EP3714970A1 (en) 2019-03-28 2020-09-30 Catalytic Instruments GmbH & Co. KG Apparatus for the production of nanoparticles and method for producing nanoparticles
JP6874054B2 (ja) * 2019-05-31 2021-05-19 株式会社クボタ 溶融金属吐出装置、皮膜形成装置及び溶融金属吐出方法
RU2730313C1 (ru) * 2020-01-20 2020-08-21 Общество с ограниченной ответственностью "Порошковые технологии" Установка для получения металлических порошков из расплавов металлов и сплавов
CN114472909B (zh) * 2022-02-07 2023-03-31 山东恒瑞磁电股份有限公司 一种一体成型电感合金原料粉制备装置
CN114472878B (zh) * 2022-02-07 2023-04-11 山东恒瑞磁电股份有限公司 一种一体成型电感软磁粉的制备方法及应用

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3049421A (en) * 1958-08-27 1962-08-14 Nat Res Corp Production of metals
DE1285098B (de) * 1960-04-23 1968-12-12 Heinrich Dr Verfahren und Vorrichtung zum Herstellen insbesondere kugelfoermiger Teilchen aus einer rotierenden, vorzugsweise metallischen Schmelze
US3165396A (en) * 1961-01-09 1965-01-12 Nat Res Corp Deflection of metal vapor away from the vertical in a thermal evaporation process
US3510546A (en) * 1967-12-15 1970-05-05 Homogeneous Metals Methods for powdering metals
US3588071A (en) * 1969-10-14 1971-06-28 Homogeneous Metals Apparatus for powdering metals
GB1307553A (en) * 1970-06-06 1973-02-21 Oxymet Ag Method of manufacturing metallic powder or granules
FR2299932A1 (fr) * 1975-02-07 1976-09-03 Anvar Lithium tres finement divise et son procede de fabrication

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4019563A1 (de) * 1990-06-15 1991-12-19 Mannesmann Ag Verfahren zur herstellung von metallpulver
DE10205897A1 (de) * 2002-02-13 2003-08-21 Mepura Metallpulver Verfahren zur Herstellung von partikelförmigem Material
AU2003206894B2 (en) * 2002-02-13 2008-10-02 Mepura Metallpulvergesellschaft M.B.H. Method for producing particle-shaped material

Also Published As

Publication number Publication date
AU575518B2 (en) 1988-07-28
CS273161B2 (en) 1991-03-12
DK32685D0 (da) 1985-01-24
PT79874A (en) 1985-02-01
EP0150755A3 (en) 1987-02-25
NO164220C (no) 1990-09-12
IN163942B (es) 1988-12-10
FI850297L (fi) 1985-07-26
US4610719A (en) 1986-09-09
RO91979A (ro) 1987-06-30
KR850005303A (ko) 1985-08-24
PL143335B1 (en) 1988-02-29
SU1563584A3 (ru) 1990-05-07
IL74135A (en) 1988-02-29
DK161571B (da) 1991-07-22
ES8608975A1 (es) 1986-09-01
DK32685A (da) 1985-07-26
NO164220B (no) 1990-06-05
JPS60221507A (ja) 1985-11-06
PT79874B (en) 1986-09-11
BR8500319A (pt) 1985-09-03
FI76716B (fi) 1988-08-31
FI850297A0 (fi) 1985-01-23
ES539751A0 (es) 1986-09-01
KR900009217B1 (ko) 1990-12-24
DE3572609D1 (en) 1989-10-05
IL74135A0 (en) 1985-04-30
CA1228458A (en) 1987-10-27
FI76716C (fi) 1988-12-12
AU3770085A (en) 1985-08-01
PL251656A1 (en) 1985-11-05
ATE45897T1 (de) 1989-09-15
DD232212A5 (de) 1986-01-22
DK161571C (da) 1992-01-06
EP0150755A2 (de) 1985-08-07
NO850274L (no) 1985-07-26
MX162212A (es) 1991-04-08
CS47285A2 (en) 1990-07-12
JPS6221842B2 (es) 1987-05-14
RO91979B (ro) 1987-07-01
DE3402500C1 (de) 1985-08-01

Similar Documents

Publication Publication Date Title
EP0150755B1 (de) Verfahren und Vorrichtung zur Herstellung von Metallpulver
DE4102101C2 (de) Einrichtung zum Herstellen von Pulvern aus Metallen
EP0451552A1 (de) Verfahren und Vorrichtung zur Formung eines Giesstrahls
DE2710116A1 (de) Verfahren und vorrichtung zum ersetzen eines fluessigkeitsvolumens durch ein entsprechendes gasvolumen in einem eingetauchten umschlossenen raum
DE7441597U (de) Vorrichtung zum herstellen von durch die umgebungsluft nicht verunreinigtem kugeligem metallpulver
DE2043882C3 (de) Verfahren zur Herstellung eines Stahlgußblockes, insbesondere einer Bramme aus unberuhigtem Stahl und Vorrichtung zur Durchführung des Verfahrens
DE3004209A1 (de) Verfahren zur herstellung eines metallischen sinterformteils und fuer die durchfuehrung des verfahrens geeignete maschine
DE2362499A1 (de) Verfahren zum kompaktieren von metallpulver
DE2400026A1 (de) Verfahren und vorrichtung zur herstellung von kugelfoermigen koerpern
EP0461306B1 (de) Induktionsschmelzofen
DE2555715A1 (de) Verfahren und vorrichtung zur pulverherstellung durch verspruehen eines geschmolzenen materials
DE2806716C3 (de) Verfahren zum Herstellen von Eisenpulver
DE2951202A1 (de) Verfahren zum von unten her erfolgenden bzw. bodenseitigen einblasen von gas in eine stahlschmelze
DE10025014C2 (de) Vorrichtung zur Herstellung von Leichtmetallgußerzeugnissen, insbesondere von Teilen aus Magnesium bzw. Magnesiumlegierungen
DE2757410A1 (de) Verfahren und vorrichtung zur erzeugung von metallpulver
DE3505662A1 (de) Verfahren zum herstellen feinen pulvers aus geschmolzenem metall sowie vorrichtung zum zerstaeuben
DE3345983A1 (de) Verfahren und vorrichtung zur herstellung von kugelfoermigen metallischen partikeln
DE102009020004A1 (de) Pulvermetallurgisches Verfahren zur Herstellung von Metallschaum
DE3211861A1 (de) Verfahren und vorrichtung zur herstellung von hochreinen keramikfreien metallpulvern
DE2833388A1 (de) Verfahren zum herstellen von zerstaeubungspulvern
DE2801918A1 (de) Verfahren und vorrichtung zur herstellung dichter, kugeliger teilchen aus metallen und metallegierungen
DE3921807A1 (de) Verfahren und vorrichtung zum beheizen eines metallurgischen ofens
DE2057862A1 (de) Verfahren und Vorrichtung zur Herstellung eines Pulvers durch Verspruehen eines geschmolzenen Materials
DE3737130C2 (de) Verfahren und Vorrichtung zum Herstellen von Feinstpulver
EP0914889A1 (de) Automatischer Tiegelstöpsel

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

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19870326

17Q First examination report despatched

Effective date: 19880420

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 45897

Country of ref document: AT

Date of ref document: 19890915

Kind code of ref document: T

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: ST. ASSOC. MARIETTI & PIPPARELLI

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3572609

Country of ref document: DE

Date of ref document: 19891005

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19900131

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19900223

Year of fee payment: 6

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
ITTA It: last paid annual fee
EAL Se: european patent in force in sweden

Ref document number: 85100339.2

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19951214

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19951215

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19951219

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19951221

Year of fee payment: 12

Ref country code: NL

Payment date: 19951221

Year of fee payment: 12

Ref country code: AT

Payment date: 19951221

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19951222

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19951223

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19970115

Ref country code: AT

Effective date: 19970115

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19970130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19970131

Ref country code: CH

Effective date: 19970131

Ref country code: BE

Effective date: 19970131

BERE Be: lapsed

Owner name: NYBY UDDEHOLM POWDER A.B.

Effective date: 19970131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19970801

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970115

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19970930

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19970801

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19971001

EUG Se: european patent has lapsed

Ref document number: 85100339.2

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST