baber/WOPTO huggingface dataset:
Patent HU-184359-B (HU)
Inventor: TOEKE LASZLO
IPC: A61K31/35
Filed: 1980-12-16
Abstract: Die Erfindung betrifft neue, in 7-Stellung substituierte Benzopyrane, deren physiologisch vertraegliche Saeureadditionssalze und quaternaere Salze und ein Verfahren zur Herstellung dieser Verbindungen. Die neuen Benzopyrane entsprechen der allgemeinen Formel I, worin R&exp1! und R&exp2! fuer Wasserstoff, Alkylgruppe mit 1-6 Kohlenwasserstoffatomen, Hydroxyalkyl-, Alkenyl-, Cycloalkyl-, Phenylalkyl- oder Dialkoxyphenylalkylgruppe steht, oder R&exp1! und R&exp2! zusammen mit dem Stickstoffatom einen heterocyclischen Ring bilden, R&exp3! fuer Wasserstoff, Alkylgruppe mit 1-4 Kohlenstoffatomen oder Phenylgruppe steht, R&exp4! Wasserstoff und R&exp5! Wasserstoff oder Phenylgruppe bedeutet, oder R&exp4! und R&exp5! zusammen ein Bindungselektronenpaar zwischen dem C&ind2!- und dem C&ind3!-Atom des Benzopyranringes bedeuten, R&exp6! und R&exp7! jeweils fuer Wasserstoff stehenoder zusammen ein Sauerstoffatom bedeuten, und die Bedeutung von n 1 oder 2 ist, mit der Einschraenkung, dass der Pyranring gleichzeitig nur durch Alkyl oder aber durch Phenyl substituiert sein kann. Die Verbindungen der allgemeinen Formel I werde in an sich bekannter Weise hergestellt. Die Verbindung der allgemeinen Formel I weisen wertvolle, vor allem in der Herzheilkunde anwendbare pharmazeutische Wirkungen auf. Formel I
Patent HU-208519-B (HU)
Title: Transvinylating process
Inventor: MURRAY REX EUGENE
IPC: C07D207/267
Filed: 1989-06-29
Abstract: A process for the transvinylation of a vinyl derivative of a Bronsted acid with a different Bronsted acid which comprises providing a liquid phase mixture containing said vinyl derivative and said Bronsted acid in the presence of a ruthenium compound at a temperature at which transvinylation occurs and recovering as a product of transvinylation the vinyl derivative of the different Bronsted acid. The process is most favorably employed using carboxylic acids to make vinyl esters of carboxylic acids.
Patent HU-193703-B (HU)
Inventor: BECKER RAINER
IPC: A01N43/18
Filed: 1984-09-28
Abstract: Die vorliegende Erfindung betrifft herbizide Mittel, die neben inerten Zusatzstoffen neue Cyclohexenonderivate oder deren Salze als Wirkstoffe enthalten. Die Verbindungen haben die Formel, in der R1 und R2 die in der Beschreibung genannten Bedeutungen haben. Die herbiziden Mittel, die 0,1 bis 95 Gew.-% Wirkstoff enthalten, eignen sich zur Bekaempfung unerwuenschten Pflanzenwuchses, insbesondere von Gramineen. Formel
Patent HU-189360-B (HU)
Title: Light-concrete building unit of increased heat-insulating capacitiy particularly slack block as well as method for producing such building units
Inventor: VIDEKI ISTVAN
IPC: E04C1/40
Filed: 1983-11-15
Abstract: Two types of concrete blocks are used to construct walls of improved heat insulating capacity. Building blocks of blast furnace slag and cement mixture are used on the inside, with blocks of polystyrene and cement mixture on the outside. During construction of the two types of blocks are fused together.
Patent HU-197440-B (HU)
Title: Device for actuating the lock of small arms of automatic ammunition feeding
Inventor: JOHANSSON BERTIL
IPC: F41A3/72
Filed: 1987-09-04
Abstract: Automatically feeding firearm having a bolt (2) which upon shooting is reciprocally moving in the receiver (1) of the weapon actuated by a recoil spring (4), and in which the bolt (2) when being set for firing its first shot, for the purpose of executing its function, is pulled back and is kept tensioned in the receiver until a trigger bar or a similar lock means releases the bolt, or alternatively the bolt is directly returned to a front position after having brought a cartridge from the magazine into a cartridge position and after having tensioned a separate firing mechanism, and in which the weapon is formed with an actuation bar (5) projecting from the back (9) of the weapon and adapted for tensioning the bolt (2) by being pulled rearwardly, which bar after said tensioning of the bolt is adapted to be returned to its initial front position. The actuation bar can be a separate actuation bar or preferably a recoil spring bar (5) which is received in a groove (3) of the bolt (2), and about which the recoil spring (4) is guided.
Patent HU-203399-B (HU)
Inventor: KOSARAS CSABA
IPC: F16B39/00
Filed: 1985-11-21
Abstract: A találmány önbiztosító csavaranya (1), mely célszerűen hatlapú normál, szabványos csavaranyából van kialakítva, melynek mindkét homlokfelülete (2) felfekvő felületként alkalmazható. Az önbiztosító tulajdonság eléréséhez a csavaranya (1) sík oldalfelületein (3) deformált menetszakaszt létesítő benyomások (7) vannak. A találmány szerint a sík oldalfelület (3) közepén van a benyomás (7), mely zárt körvonallal (8) rendelkező, a sík oldalfelületen (3) téglalap alakú, melynek oldalhossza a hosszkiterjedés irányában fekve, legalább 0,35szöiöse a menet névleges átmérőjének az oldalhossz és a szélesség egymással 1,6-1,8 közötti arányban állnak, a benyomás (7) oldal felületei a fenékfelülettel élben csatlakoznak, a benyomás (7) mélysége legfeljebb a menet névleges átmérőjének 0,18-szorosa, a benyomás (7) hosszkiterjedése a felfekvő homlok felülettel (2) megközelítőleg párhuzamos, célszerűen a menetemelkedés szögével azonos szöget zár be. (1. álra) HU 203 399 B A leírás terjedelme: 4 oldal, 2 rajz -1-
Patent HU-203018-B (HU)
Inventor: BEKE ZOLTAN
IPC: A01K1/02
Filed: 1987-10-20
Abstract: A találmány állattartó ikerketrec, elsősorban nyúltartásra, amely nyílásokkal rendelkező térhatároló elemeket, így oldalelemet, fenékelemet, hátsó elválasztó elemet, ajtóként nyitható homlokelemet, fedőelemet, az oldalelem függőleges szélei mentén elhelyezkedő lábakat, adott esetben férőhelyosztó elemet, továbbá az állatok higiénikus tartását szolgáló kiegészítő egységeket, pl. trágyafelfogó tálcát, valamint az állatok etetésére és itatására alkalmas részeket, pl. szénazsebet, etetőt és vízkörbe iktatott itatószerveket tartalmaz. Jellegzetessége, hogy a lábak (1) az oldalelem (2) alsó éle mentén elhelyezkedő tartó-terelő áthidalóval (18) vannak összekötve. Az oldalelem (2) középső része függőleges irányú hátfaltartó betéttel van ellátva. Az oldalelem (2) alsó sarkaiban, valamint a hátfaltartó betét és a tartóterelő áthidaló (18) találkozásánál ütközők vannak elhelyezve. Az oldalelemek (2) a hátsó elválasztó elemből (6) kinyúló és a hátfaltartó betéthez csatlakozó hátfal csapokkal vannak egymáshoz kapcsolva. Az oldalelemek (2) az ütközőknek támaszkodó és a fenékelemhez (5) rendelt merevítő rudakkal vannak megfeszítve, az ikerketrec felülről a lábakba (1) csúsztatható hajlított fedőcsapokkal rendelkező fedőelemmel (3) van lezárva, és így a térelválasztó és térhatároló elemek előnyösen kötőelemektől mentesen vannak térben merev ketkreccé összeépítve. (9. ábra)  9. ábra A leírás terjedelme: 4 oldal, 2 ábra HU 203 018 B -1-
Patent HU-202766-B (HU)
Title: Base element for producing the platelike forms of toy of construction set character
Inventor: LARWS PETER
IPC: A63H33/08
Filed: 1986-12-23
Abstract: For the production of panels of a toy construction set, a base element of rectangular shape is disclosed, which as at least two square openings axa, and which constitutes a flat hollow body, which is open on one large rectangular surface. The distance of the openings from the outer surfaces of the base element is a/2. Preferably, the base element has at least eight openings, which are arranged in at least two rows which lie on top of each other in rectangular array, each row comprising at least four openings which are next to each other.
Patent IT-1186270-B (IT)
Title: Baling system for refuse
Inventor: MERONI GIOVANNI
IPC: B62D/
Filed: 1985-03-01
Granted: 1987-11-18
Abstract: The collected refuse is dropped into the hopper (12) and fills a hydraulically compressed trough (100) from where it is pushed into the semi-trailer (15,16) for removal. The trough is bounded by a shutter (14) which opens when sufficient compression is reached. The shutter and press are operated hydraulically and the semi-trailer has a movable bulkhead (17) which is displaced by the compressed refuse, and through which the refuse can be discharged. The compression system can also prepare bales for loading into transfer vehicles.
Patent LV-11083-B (LV)
Title: Process of manufacturing of glazed waffles
Inventor: POLIEKTOVA TATJANA
IPC: A21D13/08
Filed: 1994-09-30
Abstract: The making of coated wafers consists of the following basic stages: the preparation of the filling, the baking of wafer sheets, the forming of the wafer sheets, spreading filling on the water sheets, and then the process of cooling and cutting to the necessary size. Afterward, the resulting wafer products are covered with coating.
Patent LV-12661-B (LV)
Title: The method for immobilisation of humus
Inventor: KLAVINS MARIS
IPC: B01J20/24
Filed: 1999-11-05
Abstract: The invention pertains to process of immobilisation humus for obtaining sorbent. Said sorbent is characterised in that the humus is immobilised by poly-condensation process using formaldehyde and aromatic compounds. Aromatic compounds are denoted with general formula Ar(R)n, wherein Ar denotes benzene ring. R denotes CH3, C2H5, OH, H, COOH, OCH3 and n= 1-3. Formaldehyde and humus medium have the weight ratio 0.5 - 2 to 1. The weight ratio of aromatic compound to humus could be diversified from 0- 2 to 1. The components react at a temperature of 80 to 100 oC in the presence of formic acid.
Patent MX-168497-B (MX)
Title: Ultrafiltracion de flujo tangencial por afinidad
Inventor: HSIA JEN CHANG
IPC: C07K1/34
Filed: 1987-01-09
Abstract: La presente invención se refiere a un proceso para la separación de móleculas de interés biológico de una mezcla que contiene dichas moléculas de interés, el cual comprende someter dicha mezcla a ultrafiltración de flujo tangencial en presencia de al menos una sustancia macromolecular de afinidad que ligue específicamente las moléculas de interés e impida su filtración mientras otras moléculas de menor tamaño se remueven por su filtración.
Patent MX-169144-B (MX)
Inventor: ETZKORN WILLIAM GEORGE
IPC: C07C57/055
Filed: 1987-07-16
Abstract: The processes for oxidation of propylene to acrolein and the oxidation of propylene to acrylic acid in two stages with acrolein as an intermediate are improved by use of anhydrous diluent gases to reduce or replace steam in the reaction streams. In particular, the use of anhydrous diluents which raise the composite flowing heat capacity of the diluent gas mixture to at least about 6.5 calories/gram mole ( DEG C) will improve selectivity to desired products and will reduce the water load on the system.
Patent NO-135277-B (NO)
Inventor: PISKORZ-NALECKI J W
IPC: B63H25/38
Filed: 1972-08-03
Abstract: Skipsroranordning.
Patent NO-146668-B (NO)
Title: Automatisk tilfoerselsanordning for skivelignende gjenstander
Inventor: EVERETT GEORGE
IPC: B67B3/064
Filed: 1975-12-11
Abstract: Automatisk tilfrselsanordning for skivelignende gjenstander.
Patent NO-160815-B (NO)
Inventor: ZIESE ROLF
IPC: G01S15/89
Filed: 1984-10-11
Abstract: A method for the acoustic surveying of the surface contours of the bottom of a body of water by means of a crossed fan beam echo sounding arrangement wherein, for the purpose of obtaining an accurate, unfalsified surface contour, the measured contours obtained by scanning the bottom of the body of water in a direction transverse to direction of the heading of the surveying ship are recalculated by means of a continuously checked and adapted correction value. The correction value is determined from deviations between a calibration contour and a test contour. The calibration contour is a longitudinal contour which is formed from measured contours lined up in the direction of the ship's heading and cover a strip on the bottom of the body of water extending perpendicularly below the path traversed by the surveying ship. The test contour is recorded in the same manner as the measured contour but with the echo sounder pivoted by 90 DEG  about the elevation axis of the ship, i.e. from the same strip of ground perpendicularly below the fore-to-aft axis of the ship with which the calibration contour is associated.
Patent NO-173717-B (NO)
Inventor: ACKERET PETER
IPC: B42F7/14
Filed: 1987-07-03
Abstract: PCT No. PCT/EP86/00623 Sec. 371 Date Jun. 11, 1987 Sec. 102(e) Date Jun. 11, 1987 PCT Filed Oct. 29, 1986 PCT Pub. No. WO87/03106 PCT Pub. Date May 21, 1987.The invention relates to a container for a pile of substantially rectangular pictures of like format, having a housing which has a viewing window for displaying the picture lying facing the window, a slider member that can be pulled out of the housing and pushed back into the housing again parallel to the plane of the window, and -preferably- having a change mechanism which takes a picture from one end of the pile when the housing and the slider member are pulled apart and returns it to the other end of the pile when they are pushed back together again, centering means being provided which align at least the picture facing the window with respect to the center of the window, and wherein the window is larger than the format of the picture, but parts of the inside of the container that are underneath those surface portions of the window that extend beyond the edges of the picture are masked.
Patent NO-178659-B (NO)
Inventor: LEE GEORGE EVERETT
IPC: C07C239/08
Filed: 1992-09-22
Abstract: The present invention relates to a novel, safe process for the preparation of N-ethylhydroxylamine hydrochloride from di-t-butyl dicarbonate and hydroxylamine hydrochloride.
Patent NO-179947-B (NO)
Inventor: BOEGESOE KLAUS PETER
IPC: C07D235/26
Filed: 1993-06-03
Abstract: 5-Substituted trans-1-piperazinoindan derivatives having general formula (I), wherein X is halogen, trifluoromethyl, alkyl, alkylthio, alkyloxy, hydroxy, alkylsulphonyl, alkyl- or dialkylamino, trifluoromethylthio or cyano; R is hydrogen, or alkyl, alkenyl, cycloalkyl, or cycloalkyl lower alkyl, optionally substituted with hydroxy, or R is a substituent (a), wherein n is an integer from 1 to 6; U is CH or N; Y is CH2, O, S or N-R<1>, R<1> being hydrogen or cycloalkyl, cycloalkylmethyl, alkyl or alkenyl optionally substituted with hydroxy or an optionally substituted phenyl group; W is O or S; Z is -(CH2)4-, (b), (c), where R<2> and R<3> are hydrogen or lower alkyl, -CH=CH-, -CH=CH-CH2-, optionally substituted 1,2-phenylene, 1,2-C6H4CH2- (to form a quinazolidinone or -thione ring system) or 1,2-C6H4CO- (to form a quinazolidindion or thioxoquinazolidinon ring system); and Ar is an optionally substituted phenyl, thiophene or furane ring; are selective, centrally acting 5-HT2 antagonists useful in the treatment of anxiety, depression, sleeping disorders, negative symptoms of schizophrenia and migraine.
Patent SE-301195-B (SE)
Inventor: PUTZ U
IPC: H01L25/03
Filed: 1964-07-22
Abstract: 1,074,146. Inductors. LICENTIA PATENTVERWALTUNGS G.m.b.H. Aug. 4, 1964 [July 30, 1963], No. 31269/64. Heading HIT. [Also in Division H2] In a full - wave rectifier arrangement the output current is controlled by transductors each having a main coolantcarrying conductor which provides both a support for some of the semi-conductor rectifying elements and a support for the control winding of the transductor in the form of a number of rings of spirallycoiled magnetic strip material stacked to form a column upon which is a toroidal winding. Fig. 3b shows one phase conductor 27 of a three-phase arrangement to which two hollow coolant carrying conductors 21, 22 are connected through groups of rectifiers 25, 26. One group 25 is mounted on the phase conductor and connected to the appropriate hollow conductor and the other, 25, is mounted upon the hollow conductor and connected to the phase conductor. The conductors are rectangular in cross-section and have a circular cross-sectional cooling channel.
Patent YU-46133-B (YU)
Title: Raketni rovokopač za podzemne otkope i izbacivanje naslaga iz cevovoda, kolektora i kanala,
Inventor: LJ MIRKOVIC
IPC: E02F5/00
Filed: 1983-07-06
Abstract: pod dejstvom pritiska fluida koji deluje na uzdužne i poprečne površine klipova se u cevovodu naizmenično kreće i vrši drobljenje i izbacivanje naslaga preko noževa povezanih za vratilo polugama i kočionim sistemom ugradjenom na prednji i zadnji deo klipnjače ugradjene u cilindre spregnute sa spoljnim elastičnim omotačem rovokopača naznačenog time, što je na prednjoj strani kočioni sistem (b) povezan za klipnjaču (12) za koju je učvršćen alat (20) koji se oslanja na profilisani nosač (44) za koji se povezuju poluge (19) za koje su učvršćeni profilisani noževi (20) koji su preko poluga (18) povezane preko zglobova (39) za nosač (16) kroz koji prolazi klipnjača (12) za koju je učvršćen klip (10) koji se preko prstena (47) kreće u komori (f) i vrši preko polužnog sistema drobljenje i izacivanje naslaga iz cevovoda (45). Prijava sadrži još 3 patentna zahteva.
Patent YU-46225-B (YU)
Title: Postupak za dobijanje hinolin-2,3-dikarbonske kiseline
Inventor: MAULDING D R
IPC: C07C229/44
Filed: 1987-08-28
Abstract: POSTUPAK ZA DOBIJANJE HINOLIN-2,3-DIKARBONSKE KISELINE formule: u kojoj je R (C1-C4)alkil ili H, naznačen time, što u prvoj fazi reaguje dihlorsukcinat formule: Cl - CH - CO2R Cl - CH - CO2R u kojoj je R (C1-C4)alkil sa minimumom 3 molska ekvivalenta amina formule: R1R2NH u kojoj R1 i R2 predstavljaju etil grupu, u inertnom rastvaraču, na temperaturi od približno 25В°C do temperature refluksa, u toku od oko 1-24 sati, pri čemu se dobija alkilaminomaleata ili alkilaminofumarata formule: i hloraminosukcinata formule: u kojima R, R1 i R2 su kao što je prethodno definisano, što u drugoj fazi ova smesa reaguje sa molskim ekvivalentom anilina u inertnom organskom rastvaraču koji sadrži organsku kiselinu, kao što je sirćetna kiselina, na temperaturi od oko 25В° C do 90В° C tokom 1-24 časa, pri čemu se dobija anilinofumarat formule: u kojoj je R kao što je prethodno definisano, i što u trećoj fazi tako dobijeni anilinofumarat reaguje sa ekvimolarnom količinom Vilsmeier-ovog reagensa u prisustvu ugljovodoničnog rastvarača ili hlorovanog ugljovodoničnog rastvarača kao što je toluol, metilenhlorid, dihloretan, ortodihlorbenzol, hlorbenzol ili njihova smesa, na temperaturi od oko 40В° C do 110В° C tokom vremenskog perioda dovoljnog da se suštinski završi reakcija i dobija dialkil-hinolin-2,3-dikarboksilat i što se potom vrši njegova hidroliza da bi se dobila hinolin-2,3- dikarbonska kiselina. Prijava sadrži 1 nezavisan i 2 zavisna zahteva.
Patent ZA-793993-B (ZA)
Title: Alkyl derivatives of c-076 compounds
Inventor: LUSI AINO
IPC: C07H17/08
Filed: 1979-08-03
Abstract: The invention provides derivatives of C-076, which is a series of macrolides, having certain hydrocarbon substituents. The hydrocarbon substituents in general are alkyl groups which may be straight or branched and may optionally be substituted with phenyl. The substituted C-076 compounds are prepared by various procedures depending upon the position of the reaction site, and the particular C-076 compound being substituted. The compounds thus produced are of formula: 
<CHEM>
 where the broken line indicates that a single or a double bond is present in the 22(23) position; R1 is hydroxy, loweralkanoyloxy or hydrocarbonoxy and is present only when the broken line indicates a single bond; R2 is iso-propyl or sec-butyl; R3 is hydrogen, methyl, loweralkanoyl or a hydrocarbon;
 R is hydrogen, loweralkanoyl, a hydrocarbon, 
<CHEM>
 where R4 is hydrogen, loweralkanoyl or a hydrocarbon, and
 R5 is hydrogen or methyl; and the said hydrocarbonoxy group of R1 is an alkoxy of from 1 to 10 carbon atoms or an alkoxy of from 1 to 10 carbon atoms or an alkoxy of from 1 to 10 carbon atoms substituted by phenyl and the said hydrocarbon groups of R and R4, which are the same or different, are alkyl of from 1 to 10 carbon atoms or alkyl of from 1 to 10 carbon atoms substituted by phenyl; and the said hydrocarbon group of R3 is an alkyl of from 2 to 10 carbon atoms or an alkyl of from 1 to 10 carbon atoms substituted by phenyl; provided that at least one of the R, R1, R3, and R4 groups is or contains a hydrocarbon group or R5 is methyl. They have profound anthelmintic, insecticidal, ectoparasiticidal and acaracidal activity and compositions for such uses are also disclosed.
Patent ZA-827961-B (ZA)
Title: Disposable pharmaceutical filter assembly
Inventor: PALL DAVID B
IPC: B01D36/00
Filed: 1982-11-01
Abstract: A disposable unitary filter assembly is provided for filtering pharmaceutical and other fluid materials having a housing of plastic material comprising first and second housing parts (1 and 2) with cooperating peripheral sealing surfaces (1a, 1b; 2a, 2b) extending in at least two planes at an angle to each other of from 30 to 150°. A filter element (8) is disposed in the fluid chamber (7) of the second housing part (2) which comprises a peripheral lip (16) extending into sealing engagement with and between the peripheral sealing surface of each housing part in each plane thereof and is permanently bonded thereto, so that it sealingly closes off the open sides of the fluid chambers (5 and 7) of both housing parts so that fluid communication therebetween is restricted to an opening (15) in an end cap (10) via the filter (8).
Patent ZA-833619-B (ZA)
Title: Device for conditioning fabrics in a tumble dryer
Inventor: KERR RENNIE GEORGE
IPC: D06M23/00
Filed: 1983-05-19
Abstract: A device for conditioning fabrics in the tumble-dryer comprises a powdered conditioning agent inside a permeable container, for example a sachet of paper, nonwoven fabric or plastics film, which in turn is inside an outer, substantially form-retaining, apertured container. The outer container is of a shape, for example, spherical, which allows ready movement among the tumbled fabrics. As it moves, the article gives more uniform and efficient conditioning than articles in the form of a sheet substrate impregnated with a solid conditioning agent.
Patent ZA-836902-B (ZA)
Title: 5-halovinyl-2'-deoxyuridine derivatives
Inventor: SCOPES DAVID IAN CARTER
IPC: C07C247/22
Filed: 1983-09-16
Abstract: Compounds of general formula (I):wherein R is a chlorine, bromine or Iodine atom and physiologically acceptable salts thereof with bases of use as antiviral agents.
Patent ZA-841907-B (ZA)
Title: 2-aminoethyl-pyridine or-pyrazine derivatives
Inventor: SIMOND JACQUES AIME LOUIS
IPC: A61K31/495
Filed: 1984-03-14
Abstract: The invention relates to compounds of the formula:   <IMAGE>   and pharmaceutically acceptable salts thereof, in which X represents either -CH= or -N=, R1 represents an alkyl radical having 1 to 5 carbon atoms, R2 represents hydrogen and R3 is an alkyl radical having 1 to 5 carbon atoms, or R2 and R3, together with the nitrogen atom to which they are bonded, represent a heterocyclic radical, such as pyrrolidinyl, morpholino, 4-phenyl-piperazinyl, in which the phenyl radical can carry one or more substituents, such as a halogen atom, an alkyl or alkoxy radical having 1 to 5 carbon atoms or the trifluoromethyl radical, or represents 4-(2-pyrimidinyl)-piperazinyl, having anti-bronchoconstrictory properties.
Patent ZA-859288-B (ZA)
Title: Apparatus for the rotary supply of molten cast-iron to an installation for the vertical continuous casting of a pipe from spheroidal graphite cast-iron
Inventor: GOURMEL YVES
IPC: B22D11/118
Filed: 1985-12-04
Abstract: Installation comprising a reservoir crucible 11, 12 for molten cast-iron F with step-by-step extraction of a pipe T produced from the crucible comprising a cooled die. To obtain a cast-iron pipe of uniform thickness over its entire circular periphery, despite the absence of a core, the molten cast-iron F is set in slow rotation in the crucible by the tangential supply of molten cast-iron with a low rate of flow through a tangential orifice 18, by the rotation of a magnet 36 disposed in a hollow central relief 17 upstanding from the base of the crucible, by the rotation of paddle arms 44 disposed in the molten iron, or by the tangential injection of an inert gas.