baber/WOPTO huggingface dataset:
Patent HU-208390-B (HU)
Title: Product and aggregated product coated with free-fluent resin for making sodeberg continuous-feed carbon electrodes
Inventor: CHANDRAMOULI PITCHAIYA
IPC: C04B35/52
Filed: 1989-10-03
Abstract: The invention is a novel Soderberg electrode paste composition. The composition is a mixture comprising carbonaceous aggregate, novolac resin binder, plasticizer and optionally hexamethylenetetramine. The novolac resin of the binder has a melting point of at least 100 DEG C and a free phenol content of not more than 4% by weight based on the weight of novolac resin solids. The residual coking value of the composition of the invention is at least as great as the minimum preferred coking value of traditional Soderberg pastes which are based on coal tar pitch binder.
Patent HU-198760-B (HU)
Inventor: BUCZKO JANOS
IPC: C22C38/00
Filed: 1987-12-09
Abstract: Az ismert eljárások során ötvözött acélból
indulnak ki és a melegalakitás után a végső
tulajdonságok beállítása érdekében külön
műveletként hőkezelést alkalmaznak. A találmány
szerinti továbbfejlesztés értelmében
alapanyagként hidegbetétes acélgyártó kemencében
készített 0,17-0,22 tömeg% carbontartalmú
1,10-1,40 tőmeg% mangántartalmú
0,40-0,60 tömeg% szilíciumtartalmú és maradékként
Fe-t tartalmazó acélból indulunk ki,
mikroötvözéssel 0,12-0,17 tömeg% vanádiumtartalmat,
0,0140-0,0180 tömeg% nitrogéntartalmat,
injektáló üstmetallurgiai eljárással
0,008-0,015 tőmeg% kéntartalmat és zárványtalariitást
biztosítunk, a melegalakitás véghőmérsékletét
pedig maximum 950 °C-ra állítjuk
be, végül a lehűtést. 70 “C/perc sebességnél
gyorsabban végezzük.
Patent HU-206050-B (HU)
Title: Process for producing hantaan virus vaccine
Inventor: LEE HO WANG
IPC: C12R1/91
Filed: 1989-11-17
Abstract: The present invention relates to Hantaan virus and a vaccine therefor. The Hantaan virus vaccine can be prepared as follows: The Hantaan virus ROK84/105 strain isolated from the human body as a seed strain, injected to one-day-old suckling mouse or rat, which is raised for about 10 days. Thereafter, the head of the mouse or rat is cut apart after paralyzing the mouse or rat to take the brain, the brain is treated with ethyl alcohol and protamine sulfate solution, the resultant is purified and inactivated, and an adjuvant is added to the final product.
Patent LV-14070-B (LV)
Title: Using oil-mixture of rapeseed-linseed or rapeseed-hemp for producing mayonnaise.
Inventor: VUCANE SANITA
IPC: A23L27/60
Filed: 2009-08-04
Abstract: The invention relates to the food industry. Oil-mixtures of rapeseed-linseed or rapeseed-hemp used according invention increase the quality grade of mayonnaise and increase the content of omega-3 and omega-6 poly-unsaturated fatty acids. Mixtures of vegetable oils like this increase content of essential fatty acids in mayonnaise improving the functional properties of product, as well as ensure longer storage time of them.
Patent LV-15196-B (LV)
Inventor: BABRIS ARNOLDS
IPC: A23B4/023
Filed: 2015-09-14
Abstract: zgudrojums attiecas uz pārtikas rūpniecību, konkrēti, uz apžāvēta zivju produkta iegūšanu
no svaigām vai saldētām Baltijasjūrasbrētliņāmvai reņģēm. Zivju konservu pagatavošanas paņēmiens ietvervairākas
stadijas. Saldētas zivis vispirms tiek atlaidinātas pie temperatūras 12 -18 °C, tad saldētās zivis pēc atlaidināšanas
vai svaigas zivis tiek sālītas un tālāk tās tiek pakļautas karstai apžāvēšanai, kas notiek trīs stadijās: apžāvēšana 40
-60 °C temperatūrā; 40 min ilga apstrāde ar karstu tvaiku un gaisu 130 -150 °C temperatūrā; atdzesēšana 20-30 °C
temperatūrā. Pēc tam apžāvētajām zivīm tiek atdalītas galvas ar žaunu vākiem, liemeņi tiek fasēti un zivis tiek
pārlietas araugu eļļu un tām pievienotas garšvielas vai citas piedevas. Kārbas tiekaizvākotas un sterilizētas 120 °C
temperatūrā.
Patent LV-10238-B (LV)
Inventor: DAVID JONES JOHN
IPC: C07C69/54
Filed: 1992-12-07
Abstract: Aprakstīts paņēmiens agroķīmisko
starpproduktu ar formulu (I) iegūšanai:
(D
(ID
R1,R2, R3 un R4 neatkarīgi viens no otra ir ūdeņraža
atoms, halogēna atoms, C1-C4alkil-,C1-C4alkoksi-, acetoksivai
acilgrupa.
Paņēmiens ietver sekojošas pakāpes:
a) savienojuma ar formulu (II), kur X, R1,R2, R3 un R4 ir ar
augstākminētajām nozīmēm, reakciju ar savienojumu ROCH3,
kur R ir metāla atoms; un
b) iepriekšējā pakāpē (a) iegūtā produkta reakciju ar
savienojumu, kuram ir formula (III), kur Z1 un Z2 ir halogēna
atomi. Aprakstīts paņēmiens savienojumu ar formulu (II) izejvielu
un pašu savienojumu ar formulu (II) iegūšanai, kā ari
paņēmiens tīra individuāla savienojuma ar formulu (II) iegūšanai,
kur R1,R2, R3 un R4 visi ir ūdeņraža atomi.
Patent LV-12158-B (LV)
Title: Strain of tuberbacterium rhizobium trifolii 8
Inventor: ANITA LIELPETERE
IPC: A01N63/00
Filed: 1998-06-30
Abstract: Invention applies to microbiological fertilisers. New strain of nitrogen -fixing bacteria Rhizobium trifolii strain 8 has been obtained. Preparations of these bacteria can be used in the treatment of clover seeds. The strain is deposited in the international depository-Latvian Collection of Microorganism Cultures as number P306.
Patent MX-172623-B (MX)
Title: Procedimiento para la produccion de tizanidina
Inventor: CONRAD LJUBOMIR
IPC: C07D417/12
Filed: 1987-03-25
Abstract: La presente invención se refiere a procedimiento para la producción de 5-cloro-4-(2-imidazolin-2-ilamino)-2,1,3-benzotiadiazol(tizanidina), caracterizado porque se hace reaccionar 5-cloro-4-cianamino-2,1,3-benzotiadiazol con mono-p-toluenosulfonato de etilenodiamina en xileno.
Patent MX-165862-B (MX)
Title: Recipiente retornable para sustancias quimicas liquidas y conector para el mismo
Inventor: CRUMBY TOM IRA
IPC: A01M7/00
Filed: 1987-09-02
Abstract: La presente invención se refiere a un conector para montarse en la tapa de un recipiente cerrado para dispensar sustancias químicas líquidas desde el mismo, caracterizado por; la combinación de; un miembro soportador tubular que tiene un extremo abierto, adaptado en su periferia para acoplamiento sellador con la tapa; una placa de cierre en el extremo opuesto del miembro soportador tubular; un tubo dispensador de sustancia química líquida, montada selladoramente en la placa de cierre y que se extiende axialmente en el miembro soportador tubular para contato con la sustancia química líquida en el recipiente; medios acopladores que coronan el extremo superior del tubo dispensador, para conexión a una línea de transferencia de líquido; y un tubo de alivio o respiradero, montado selladoramente adyacente al tubo dispensador en la placa de cierre y que tiene una válvula de alivio de presión o de presurización, que es removible para llenar el recipiente con sustancia química líquida.
Patent NO-127786-B (NO)
Inventor: MONTHULET P
IPC: A01K89/01
Filed: 1968-10-25
Abstract: Fiskesnelle med stasjonær spole og dreibar spoletrommel.Der foreligger allerede kapslede fiskesneller som er ut-styrt med treghetsfri bremse bestemt for å eliminere enhver utilsiktet sperring av snøreføreren under et kast, ved rotasjon av trommelen, mens der derimot ikke kjennes noen åpen haspelsnelle med en så-dan innretning, hvilket skyldes vanskelighetene med å anbringe en bremseinnretning i et sterkt redusert rom. Formålet med foreliggende oppfinnelse er å eliminere disse ulemper.Nærmere bestemt angår oppfinnelsen en fiskesnelle med stasjonær spole og dreibar spoletrommel som bærer en snørefrerbøyle som mot kraften av en fjær kan bringes til en tilbaketrukket, uvirksom stilling, i hvilken den sperres ved hjelp av en første arm på en)å spoletrommelen lagret utløservektstang men løses ut til Virksom stilling ved at spoletrommelen dreies, idet trommelen er avbremset ved
Patent NO-145443-B (NO)
Title: Papirmaskin, saerlig for fremstilling av tissuepapir.
Inventor: KOPONEN MARTTI
IPC: D21F3/02
Filed: 1976-09-14
Abstract: Papirmaskin, særlig for fremstilling av tissuepapir.
Patent NO-152261-B (NO)
Title: Slagoverfoeringsanordning for nedrammingsapparater
Inventor: KUEHN HANS
IPC: E02D13/10
Filed: 1976-12-17
Abstract: SLAGOVERFBRINGSANORDNING FOR NEDRAMMINGSAPPARATER.
Patent NO-146009-B (NO)
Title: Fremgangsmaate og apparat for fremsilling av et fibroest element
Inventor: GREEN KIERON PHILIP
IPC: D21J3/06
Filed: 1977-08-01
Abstract: Fremgangsmåte og apparat for fremstilling av et fibrøst element.
Patent NO-151068-B (NO)
Title: Sugekopp for et apparat til suging av morsmelk
Inventor: LARSSON KARL OLOF AXEL HELMER
IPC: A61M1/00
Filed: 1981-09-04
Abstract: Sugeapparat for morsmelk. Apparatet består i det. vesentlige av en sugekoppdel med tilslutningsstusser (2 og 3) henholdsvis for sugeledningen og en beholder.I tillegg er et oppsamlingskammer (5) festet til.koppen. Kammerets utløp 5' er forsynt med en ventil (6) som under bruk holdes i lukket stilling ved hjelp av undertrykk.Denne konstruksjon muliggjør en mer avbalansert og sikrere bruk av apparatet.
Patent NO-154972-B (NO)
Inventor: OESTERBERG LARS BIRGER
IPC: D21F1/00
Filed: 1982-06-16
Abstract: A forming fabric comprising an upper layer (1) which is intended to serve as the paper-forming side and consists of thinner yams (3, 4), and a bottom layer (2) which consists of coarser yams (5, 6). The two layers (1, 2) are interconnected in that threads (7, 8) from the upper layer alternately pass downwardly to interweave with the bottom layer (2) and in the upper layer replace one another in such a manner that together these threads form the same weave pattern with the upper layer (1) as the rest of the yams in that layer, which yams do not interweave with the bottom layer. 1
Patent NO-167360-B (NO)
Inventor: MUELLER KARL-FRIEDRICH
IPC: A61K9/22
Filed: 1984-08-14
Abstract: A controlled-release, drug-delivery composition which comprises (A) a crosslinked copolymer, capable of swelling in ethanol to give a swollen copolymer containing at least 40% by weight of ethanol, and capable of swelling in water to give a swollen copolymer containing no more than 20% by weight of water, where the swelling ratio (% ethanol: % water) is 2:1 to 22:1, which comprises the copolymerization product of (a) 50 to 99% by weight of said copolymer of a water-insoluble monoolefinic monomer or (a) with 0 to 45% by weight of total monomers of a water-soluble monoolefinic monomer, with (b) 50 to 1% by weight, but not more than 20 mol % of a divinyl or polyvinyl crosslinking agent; and (B) an effective amount of a pharmaceutical medicament is useful for the controlled and prolonged release of drugs when taken orally.
Patent NO-167197-B (NO)
Inventor: HUCHETTE MICHEL FRANCAISE
IPC: C04B24/38
Filed: 1985-08-05
Abstract: 1. Process for the manufacture of gypsum boards, characterized by the fact there is used as a bonding agent protective colloid, an amount of amylaceous material representing from 0.2 to 2 % by weight with respect to the weight of plaster employed, said amylaceous material comprising, on the one hand, a proportion of at least 30 %, preferably at least 45 % by weight of particles of native wheat starch of dimension less than 10.7 mu m and, on the other hand, a proportion of at the most 20 % by weight of particles of native wheat starch of dimension greater than 35 mu m, the presence of these two granulometric fractions being determined by a method A of analysis.
Patent NO-165847-B (NO)
Inventor: HIGGINS WILLIAM ALBERT
IPC: C08K5/41
Filed: 1985-12-05
Abstract: Polyolefin compositions are described which can be dyed by conventional dyeing techniques. Such polyolefins comprise a blend of (A) a polyolefin and (B) a dye-receptive amount of at least one metal sulfonate which is soluble in the polyolefin when melted, and which sulfonates are characterized by the formulae   <IMAGE> (I) (R'ArSO3)xM (II)  wherein R is an aliphatic group, R' is an aliphatic group containing at least about 8 carbon atoms, Ar is an aromatic group, M is an alkali or alkaline earth metal, n is at least 1, y is equal to 1 when M is an alkali metal and 1/2 when M is an alkaline earth metal, and x is equal to the valence of M. The preferred sulfonates are those represented by Formula (I) and especially wherein M is sodium. In particular, it has been found that films and fibers prepared from such polyolefin composition, and more particularly polypropylene compositions, are readily dyed with common dyes to provide deep shades and fastness.
Patent NO-169268-B (NO)
Inventor: CUGNINI ALDO G
IPC: H04H20/88
Filed: 1986-05-29
Abstract: A stereophonic broadcasting system incorporating companding of the difference signal in which both the usual difference signal(s) and a compressed version of te difference signal(s') are transmitted to one or more remote receivers (70). At the receiver (70) the usual difference signal(s) and the compressed difference signal(s') are combined (84) and the resulting signal then expanded (86) to obtain a noise-reduced difference signal for dematrixing (74) with the sum signal (M) to obtain the original left (L) and right (R) signals. Utilizing both difference signals increases the effective level of the received difference signal by about 6dB, whereas the noise is increased only about 3dB, for a net improvement of about 3dB in signal-to-noise ratio, and also permits compression of the difference signal according to any desired compression law and the use of the unchanged difference signal(s) as a reference signal for controlling the expansion (146) of the compressed difference signal(s') so as to cause the amplitude of the companded difference signal to equal the level of the usual difference signal(s). That is, the expander is adaptive to any compression characteristic that might be employed at the transmitter (24). Further the availability of the usual uncompressed difference signal(s) at the receiver enables the adaptive decoding of dynamic parameters of the received signal, such as frequency response and attack and recovery times, so that all of the parameters of the original signal can be restored automatically.
Patent NO-176213-B (NO)
Inventor: URUSHIBATA HIDEAKI
IPC: D21C5/02
Filed: 1989-11-16
Abstract: A deinking composition comprises a reaction product obtained by reacting a glyceride mixture derived from natural oil and fat with ethylene oxide and propylene oxide, (a) said glyceride mixture (a) comprising 5 to 10 percent by weight of monoglycerides, 30 to 45 percent by weight of diglycerides and 50 to 70 percent by weight of triglycerides, (b) said reaction product having a molar ratio of ethylene oxide to propylene oxide in the range between 1.8 and 2.2, (c) said reaction product having the mole number of added ethylene oxide in the range between 30 and 80 on the average based on a mole of glycerides.
Patent NO-180169-B (NO)
Inventor: PICKENS JOSEPH ROBERT
IPC: C22F1/057
Filed: 1991-02-15
Abstract: Aluminum-base alloys which are provided which possess highly desirable properties, such as relatively low density, high modulus, high strength/ductility combinations, strong natural aging response with and without prior cold work, higher artificially-aged strength than existing Al-Li alloys with and without prior cold work, weldability, good cryogenic properties, and good elevated temperature properties. In one embodiment, aluminum-base alloys are provided having Al-Cu-Li-Mg compositions in the following ranges: 5.0-7.0 Cu, 0.1-2.5 Li, 0.05-4 Mg, 0.01-1.5 grain refiner selected from Zr, Cr, Mn, Ti, Hf, V, Nb, B, TiB2, and mixtures thereof, and the balance essentially Al. In another embodiment, aluminum-base alloys are provided having Al-Cu-Li-Mg compositions in the following ranges: 3.5-5.0 Cu, 0.8-1.8 Li, 0.25-1.0 Mg, 0.01-1.5 grain refiner selected from Zr, Cr, Mn, Ti, Hf, V, Nb, B, TiB2, and mixtures thereof, and the balance essentially Al.
Patent NO-175111-B (NO)
Title: Aktivator for overföring av frem- og tilbakegående dreiebevegelse
Inventor: SANDE KURT
IPC: F01C9/00
Filed: 1992-06-15
Abstract: Fluiddrevet aktivator omfattende en kammerdel () med minst ett kammer (, 13) , en medbringer (3) som er dreibart opplagcrt i kammerdelen (1), og et sirkelj.uef cT-met plungerstempel (2) . Plungerstempelet kan beveges langs sirkelbuen og på denne måte dreie om medbringerens dreieakse (50) idet det forløper i kammeret, og er innrettet til forbindelse med medbringeren (3)..Ifølge oppfinnelsen er plungerstempelet (2) via en tetningsanordning (32, 33, 4 2. - 45) ført tettende gjennom en åpning (14, 15) i kammeret (12,3), idet det er klaring mellom overflaten av det parti av plungerstempelet som befinner seg i kammeret, og kammerveggene. Videre er det parti av plungerstempelet som befinner seg utenfor kammeret (12, 13). understøttet langs sin radialt ytre U overflate av en støttedel () som er festet til kammerdelen (i) . ^
Patent NO-177936-B (NO)
Inventor: SOLSTAD VIDAR
IPC: D03D49/60
Filed: 1993-11-08
Abstract: A weaving loom of the kind comprising a carrier (6) for at least one shuttle (5, 5') and a stationary frame (1) accommodating a reed of wires or dents (7) disposed in a plane extending parallel to the direction of movement of the shuttle carrier (6) to guide the warp threads to a place where the weft thread is introduced by means of the shuttle. A freely rotatable toothed wheel (4) being mounted on the shuttle carrier (6) in front of the corresponding shuttle, at an angle to the reed plane and in engagement with the reed wires or dents (7) to form a shuttle shed. The toothed wheel (4) is mounted on the opposite side of the reed plane with respect to the shuttle arrangement in order to provide better space for the shuttle arrangement. <IMAGE>
Patent SE-324300-B (SE)
Inventor: NIILOLA A
IPC: E05B67/24
Filed: 1968-06-14
Abstract: 1,172,633. Padlocks. A. K. NHLOLA. 12 June, 1968 [15 June, 1967], No. 27878/68. Heading E2A. A padlock comprises a lock case 1, a lock cylinder 2 inside the lock case which cylinder can be rotated into and out of a locking position with the aid of a key, and a lock shackle 4 the limbs 5, 8 of which are located adjacent two sides of the cylinder and a locking ball 6 between one limb (5 as shown) and the cylinder and which ball is pushed into a first notch 7 in the said limb when the cylinder is turned into its locking position, wherein a locking element 3 passes through the cylinder at the same height in the lock case as the locking ball and the end portion of the locking element adjacent, the ball protruding from the cylinder so that when the cylinder is turned into its locking position the locking element pushes the ball into the first notch and the opposite end of the locking element rests against a bridge 10 of material between the cylinder and the opposite limb of 'the lock shackle, the said opposite limb having a notch 11 into which the bridge of material is pushed by the locking element if an attempt is made to release the shackle by pressure exerted between the shackle and the lock case. As described such pressure cams the ball out of its notch 7 and the ball urging the element against the bridge of material to push it into the notch 11. The ball as shown is in engagement with the notch in the limb 5 but in a modification it can be in engagement with the notch 11 in the limb 8 in which case the bridge of material is pushed into the notch 7.
Patent YU-46270-B (YU)
Title: Postupak za dobivanje cementa za privremeno cementiranje u stomatologiji sa fizičko hemijskom aktivacijom posredstvom pljuvačke
Inventor: SLAVEN KEZIC
IPC: A61K6/884
Filed: 1988-12-22
Abstract: POSTUPAK ZA DOBIVANJE CEMENTA ZA PRIVREMENO CEMENTIRANJE U STOMATOLOGIJI SA FIZIČKO HEMIJSKOM AKTIVACIJOM POSREDSTVOM PLJUVAČKE, kome ne prethodi faza pripreme prije momenta upotrebe, naznačen time, da se jedinjenja opšte formule: pri čemu su polivinil acetat (I), derivati 1,2 etanediol acetata (II)1, ZnO (III), CaSO4 x 1/2 H2O (IV), ZnSO4 (V) pripremljeni u vidu lateks cementa podvrgnu nestehiometrijskog ekvivalentnoj transformaciji pod uticajem H2O (VI) iz pljuvačke stvarajući agregate kao što su: kalcij sulfati dihidrat (IV), cink sulfat heptahidrat (V) te helat cinka (III) povezanih jedinjenjem opšte formule (I) kao što je aktivirani polivinil acetat (I), čime se ostvaruje mehanizam aktivacije i kontinuitet vezivanja cementa nakon momenta upotrebe. Prijava sadrži još 1 zavisan zahtev.
Patent ZA-825363-B (ZA)
Title: Derivatives of 2-nitro-4-or-5-pyridyloxyphenylphosphonic acid,the preparation thereof,the use thereof as herbicides and/or plant growth regulators and/or microbicides,intermediates employed for obtaining said derivatives,the preparation thereof and use thereof as herbicides
Inventor: MAIER LUDWIG
IPC: C07F9/58
Filed: 1982-07-27
Abstract: The invention relates to novel 2-nitro-4- or -5-pyridyloxyphenylphosphonic acid derivatives of the formula <IMAGE>   wherein X is halogen or trifluoromethyl, Y is hydrogen or halogen, one of the two substituents A and E is a phosphonate group <IMAGE>  wherein R is C1-C4 alkyl or hydrogen, and the other is a nitro group, including the metal salts thereof and the salts thereof with ammonium and organic nitrogen bases, and to the preparation and use thereof. These compounds may be used for controlling weeds, regulating plant growth, or as microbicides.
Patent ZA-828268-B (ZA)
Title: An autogenous grinding method
Inventor: MARKLUND OLLE EMANUEL
IPC: B02C25/00
Filed: 1982-11-11
Abstract: The present invention relates to a method for comminuting a coarse lump mineral material in an autogenous primary grinding system, in which an ingoing material is divided into a coarse fraction and a fine fraction is determined by a crushing point determined by the point of intersection between two tangents drawn through two adjacent inflexion points on a size distribution graph obtained by screen analysis of a grinding mill charge of material obtained after an autogenous grinding process. The smallest particle size of the coarse fraction is greater than the particle sizes in the upper of said inflexion points, and the ratio between said fractions is determined on the basis of achieving a given charge quantity for a particular, selected set-point power value fo the mill in question, and determined with respect to a selected degree of grinding.The grinding efficiency of autogenous primary grinding mills is greatly improved by means of the invention (Figure 4).
Patent ZA-835914-B (ZA)
Title: High efficiency continuous separation process
Inventor: CLARENCE GEORGE GERHOLD
IPC: C13K13/00
Filed: 1983-08-11
Abstract: An extract component is separated from a raffinate component contained in a feed mixture by a process in which a unidirectional fluid flow system is maintained through a series of separating units through which the components travel at different rates. A component concentration distribution is established within the system of units and divided into specific zones. Feed and displacement fluid are passed into the inlets of two of the units and extract and raffinate are taken as the entire streams from outlets of two of the units all at appropriate points on the component concentration distribution. Other inlets and outlets of the various units lying in the same zone are interconnected. At the appropriate times the inlets and outlets are shifted so as to simulate movement of the units in a direction co-current with the fluid flow and thereby enable the inlets and outlets to continually lie in the appropriate zones. Zones may be combined as zone pairs, each such pair thereupon being considered a single continuous zone.
Patent ZA-844087-B (ZA)
Title: Grease composition
Inventor: HORODYSKY ANDREW GENE
IPC: C10N50/10
Filed: 1984-05-29
Abstract: Grease compositions, wherein the grease is thickened with a metal hydroxyl-containing soap grease thickener are provided. Other essential ingredients of the compositions include borated hydrocarbyl epoxides and phosphorus and sulfur moieties.
Patent ZA-844622-B (ZA)
Title: Mineral fibre felt
Inventor: BATTIGELLI JEAN A
IPC: D04H1/4218
Filed: 1984-06-19
Abstract: 1. Felt consisting of fibres of a glass material, the fibres being produced by passage of the material in the molten state through orifices disposed on the periphery of a centrifuge and possibly drawn out by gaseous currents surrounding the centrifuge, characterised in that the mass of particles of a diameter greater than ten times the mean diameter of the fibres constitutes less than 1% of the mass of the felt.