baber/WOPTO huggingface dataset:
Patent NO-168341-B (NO)
Inventor: YADLOWSKY SLAWKO
IPC: B65D81/34
Filed: 1985-07-15
Abstract: An aqueous food extract of improved quality is produced by treating an infusion bag material with a water-soluble, fluoro-chemical sizing agent to prevent sorption of flavor oils by the infusion bag material, and thus enable extraction of the flavor oils into the brew during brew preparation. The infusion bag material may be treated with the sizing agent in various ways as, for example, by addition of the sizing agent during production of the infusion bag material or application of the sizing agent to the surface of the infusion bag material either before or after a food product is enclosed therein.
Patent NO-178485-B (NO)
Inventor: OLTHOFF MARGARETHA
IPC: A61K47/38
Filed: 1989-02-24
Abstract: A wet granulate is provided containing a therapeutically useful substance having a water solubility 10 wt% or less and microcrystalline or microfine cellulose or a mixture of both, characterised in that substantial amounts of wet binders are avoided.   Tableting mixtures with the new granulate possess a good flow pattern and may be compressed to tablets which show an excellent disintegration behaviour.
Patent NO-179782-B (NO)
Inventor: SHINOTSUKA HIROMI
IPC: B65H1/26
Filed: 1989-09-11
Abstract: The invention relates to an apparatus for storing and supplying sheet-like materials in which a multiplicity of uniform sheet-like materials supplied are temporarily stored in a pile and then, removed one by one for transferring to the next step of procedure. The apparatus comprises guide members (6,7,8,9) for guiding the sheet-like materials; collecting and moving means (1) for transferring sheet-like materials; support members (11) wherein sheet-like materials can be loaded for downward transfer to a lower position; pile setting means (21) provided beneath said collecting and moving means (1); pressing-down means (31) for pressing the sheet-like materials downward with its own weight, provided beneath said collecting and moving means (1) and above the setting members (21); and pulling infeed means mounted beneath said setting means (21) and having vertically movable suction sections (41) for pulling the sheet-like materials one by one outward from said setting means (21).
Patent NO-175756-B (NO)
Title: Fremgangsmåte for bestemmelse av en satelittkommunikasjonsantennes retningsinnstilling mot geostasjonære satellitter
Inventor: PAIK WOO H
IPC: H01Q1/12
Filed: 1989-09-26
Abstract: Anordning for å rette en satellittantenne (14) mot en gitt satellitt, og som muliggjør vesentlig forkortet innstillings-tid når antennen skal kunne rettes mot et stort antall satellitter, idet anordningen omfatter en antennestyring (10) for bestemmelse av antennens retning, innretninger (10, 24, 26). for måling av antennens relative retning mot minst to referansesatellitter, og en innretning (22) for behandling av nevnte målinger med lagrede data (18) som angir relative retninger mot den gitte satellitt og referansesatellittene,. for derved, i henhold til en algoritme, å bestemme antennens innstillingsretning mot den gitte satellitt. Anordningen omfatter også en innretning (22) som muliggjør at antennestyringen (10) for satellittantennen (14) bestemmer helningen av antennens lineære polarisasjonsakse for tilpasning til kanaler med henholdsvis odde og like nummer, mottatt fra den gitte satellitt. En utførelse av anordningen omfatter også en bærbar innretning (20), til hvilken data kan overføres fra antennestyringen for en referanseantenne (32), og fra hvilken de overførte data kan føres videre til førstnevnte antennestyring (10) for å lagres i denne, idet de nevnte data angir relative retninger mot den gitte satellitt og referansesatellittene og/eller relativ helning av den lineære polarisasjonsakse for tilpasning til kanaler med henholdsvis odde og like nummer,. mottatt fra den gitte satellitt av nevnte referanseantenne.
Patent NO-172390-B (NO)
Title: Analogifremgangsmaate for stereospesifikk fremstilling av terapeutisk aktive furo(3,4-c)-pyridin-enantiomerer
Inventor: BONATO MARC
IPC: C07D491/048
Filed: 1989-12-05
Abstract: Foreliggende oppfinnelse angår stereospesifikke fremgangsmåter for fremstilling av enantiomerer av 3-substituert-furo[3,4-c]pyridin med formel I, hvor R, Rog Rstår for forskjellige substituenter, omfattende følgende trinn: oksydasjon av et racemisk pyridinderivat med formel II, reduksjon av det resulterende keton med et reduksjonsmiddel, stereospesifikk låsing eller blokkering av OH-gruppen av den enantiomere alkohol, åpning av acetonidringen og cyklisering av den resulterende forbindelse.Foreliggende oppfinnelse angår også de således oppnådde forbindelser og terapeutiske preparater derav.
Patent NO-173139-B (NO)
Inventor: KENNIS LUDO EDMOND JOSEPHINE
IPC: C07D409/14
Filed: 1990-01-08
Abstract: Novel 2-aminopyrimidinone derivatives of formula <CHEM>  wherein R<1> is <CHEM>  R<3> is hydrogen or C1-6alkyl;  R<4> is hydrogen, C1-6alkyl or substituted C1-6alkyl; R<5> is hydrogen, C1-6alkyl, C1-6alkylaminocarbonyl, Ar-aminocarbonyl, C1-6alkylcarbonyl or Ar-carbonyl; R<6> is hydrogen, C1-6alkyl or Ar-C1-6alkyl; or R<5> and R<6> taken together is -CH2-CH2-, -CH2-CH2-CH2-, -CH=CH-, -CH=N-, -N=CH- or -N=CH-CH2-; the pharmaceutically acceptable acid addition salts and possible stereochemically isomeric forms thereof; pharmaceutical compositions containing such compounds as an active ingredient and methods of preparing said compounds and pharmaceutical compositions.
Patent NO-174417-B (NO)
Inventor: COMMANDEUR RAYMOND
IPC: C07B61/00
Filed: 1990-12-28
Abstract: Process for the synthesis of oligomers of benzyltoluene in which the condensation of benzyl chloride with toluene is carried out in the presence of ferric chloride and then a treatment with, in particular, sodium methoxide is carried out to eliminate the chlorinated organic products. The oligomers obtained, essentially benzyltoluene and dibenzyltoluene, are suitable as a dielectric fluid.
Patent YU-46054-B (YU)
Title: Postupak za dobijanje imidazohinolinskih derivata
Inventor: MEANWELL N A
IPC: A61P7/02
Filed: 1987-06-23
Abstract: POSTUPAK ZA DOBIJANJE IMIDAZOHINOLINSKIH DERIVATA formule u kojoj je R1 halogen, C1-4 alkil, C1-4 alkoksi ili trifluorometil; R2 je vodonik, halogen, C1-4 alkil ili C1-4 alkoksi; R3 je vodonik, halogen, C1-4 alkil ili C1-4 alkoksi; i R4 je vodonik ili C1-4 alkil, i njihovih farmaceutski prihvatljivih soli, hidrata i solvata, naznačen tim e, što se redukuje supstituisani hidantoin formule: u kojoj su R1, R2, R3 i R4 kao što je definisano gore i a i b su vodonikovi atomi ili kovalentna veza, hidrogenacijom u rastvaraču kao što je dimetilformamid, na pritisku od atmosferskog do nadpritiska od oko 4.2 bara, na temperaturi oko sobne i u prisustvu katalizatora, kao što je paladijum-na-uglju, da bi se dobio intermedijer formule: u kojoj R1, R2, R3 R4, a i b imaju značenja kao što je definisano gore, koji ciklizuju u jedinjenje formule: u kojoj su R1, R2, R3 i R4 kao što je definisano gore, u rastvaraču kao što je metanol ili etanol, na temperaturi refluksa reakcione smeše i u prisustvu kiseline, kao što je p-toluolsulfonska kiselina, pa se dobijeni intermedijer podvrgava dehidrogenaciji sa jodom, u rastvaraču kao što je dimetilformamid i na temperaturi refluksa, da bi se dobio željeni proizvod formule (XII); i što se jedinjenje formule (XII), prema potrebi, prevodi u svoju farmaceutski prihvatljivu so i izoluje u obliku hidrata ili solvata.
Patent YU-47124-B (YU)
Inventor: COROMINAS PARES J
IPC: A61K31/47
Filed: 1988-12-28
Abstract: POSTUPAK ZA DOBIJANJE NOVIH DERIVATA 7-(1-AZETIDINIL)-1,4-DIHIDRO-4-OKSOKINOLEIN-3-KARBOKS ILNIH KISELINA, opšte formule I u kojoj R1 predstavlja C1-4 alkil, fluoro C1-4 alikil, ciklopropil, fenil ili supstituisani fenil sa jednim ili više atoma fluora, R2 predstavlja atom vodonika, atom fluora, ili R1 i R2 mogu zajedno da obrazuju vezu predstavljenu grupom X, R3 predstavlja atom vodonika ili C1-4 alkil, R4, R5 i R6 nezavisno predstavljaju atom vodonika, C1-4 alkil, hidroksi, amino, amino C1-4 alikil, di C1-4 alkilamino, C1-4 alkilamino C1-4 alkil, C1-4 alkoksi, meziloksi, hidroksi C1-4 alkil, cijano, acetamino C1-4 alkil, karboksilna grupa, karboksiamido, karboksi C1-4 alkil, atom fluora, C1-4 alkilkarboksil kao acetoksi, acetamido ili acetamido C1-4 alkil gde slobodne krajnje alkil grupe mogu da budu fluorovane, i u acetamidoalkil radikalu atom azota može da bude supstituisan C1-4 alkil grupom, X predstavlja -CH2-CH2-CHR7-, -O-CH2-CHR7 ili gde R7 predstavlja atom vodonika ili C1-4 alkil, R8 predstavlja atom vodonika ili atom halogena prvenstveno fluora i Y predstavlja CH ili N, izuzimajući jedinjenja formule (I) u kojoj R1 i R4 zajedno obrazuju vezu predstavljenu grupom -O-CH2-CH(CH3)- i R3, R4 i R6 predstavljaju atom vodonika a R5 predstavlja hidroksi ili hidroksimetil grupu, i izuzimajući jedinjenja formule (I) u kojoj R1 predstavlja etil, R2 predstavlja atom fluora, R3, R4 i R6 predstavljaju atom vodonika i R5 predstavlja etilaminometil, nazn ačen time, što heterociklično jedinjenje formule II u kojoj R1, R2 i R3 imaju napred navedena značenja, i Z predstavlja atom halogena, reaguje sa jedinjenjem formule III u kojoj R4, R5 i R6 imaju napred navedena značenja, na temperaturi izmedju 50 i 250В°C u rastvaraču iz grupe koju čine niži alkoholi kao što je etanol ili izopropanol, etri kao što je tetrahidrofuran ili dioksan, nitrili kao što je acetonitril ili piridin, u prisustvu akceptora kiseline kao što su alkalni hidroksidi i karbonati ili amini kao što je trietilamin, ili navedeno heterociklično jedinjenje formule II u kojoj Z predstavlja amino radikal reaguje sa jedinjenjem formule IV u kojoj R4, R5 i R6 imaju navedena značenja i A predstavlja halogen, hidroksilnu, C1-4 alkil- ili fenil-sulfoniloksi grupu, na temperaturi izmedju 10 i 150В°C u aprotonskom rastvaraču kao što je dimetilsul-foksid ili dimetilformamid, i u prisustvu akceptora kiseline kao što su alkalni hidroksidi i karbonati ili amini kao što je trietilamin.
Patent RS-52818-B (RS)
Inventor: PISEK ROBERT
IPC: A61K47/00
Filed: 2003-10-06
Abstract: Farmaceutska formulacija sa kontrolisanim oslobadjanjem, koja sadrži: (a) najmanje jedan aktivan sastojak, (b) natrijum alginat, i (c) natrijum-kalcijum alginat naznačena time, da je težinski odnos natrijum alginata (b) prema natrijum-kalcijum alginatu (c) od 1:1,1 do 1:2.Prijava sadrži još 1 nezavisni i 9 zavisnih patentnih zahteva.
Patent ZA-795352-B (ZA)
Title: Coating polymerization reactors with oligomer coatings derived from reaction products of substituted phenols
Inventor: COHEN L
IPC: B05D7/22
Filed: 1979-10-08
Abstract: This invention relates to a polymerization reaction vessel having a coating on the inner surfaces thereof resulting from applying thereto a coating composition containing, as a primary ingredient, the reaction product or oligomers of (1) an alkyl or halogen substituted phenol, such as p-chlorophenol and the like, (2) a condensing agent, such as formaldehyde, and the like, and (3) a polyhydric phenol, such as resorcinol, and the like, dissolved in water or an aqueous alkaline solution. When polymerizing olefinic monomers, such as vinyl halides, vinylidene halides, and vinylidene monomers, having at least one terminal  <IMAGE>  and mixtures thereof, polymer buildup on the inner surfaces of the reaction vessel is substantially eliminated. Further, multiple charges or batches of polymer can be made in said internally coated reaction vessel without opening the same between charges thus preventing the escape of unreacted monomer(s) to the surrounding atmosphere.
Patent ZA-822935-B (ZA)
Title: Composite membrane/electrode,electrochemical cell and electrolysis process
Inventor: COPELAND TERRY MICHAEL
IPC: C25B9/23
Filed: 1982-04-29
Abstract: A composite membrane/electrode, process for making same, an electrochemical cell and its use in the electrolysis of alkali metal halides, especially sodium chloride, are described. The composite membrane/electrode comprises a perfluorinated ion-exchange membrane having at least a layer of polymer having carboxylic functionality and a layer of polymer having sulfonic functionality, and a stratum of electrocatalyst bonded to at least one surface thereof. A chloralkali cell with such a composite membrane/electrode operates at low voltage, high current efficiency, and low power consumption.
Patent ZA-826191-B (ZA)
Title: A cycle
Inventor: HUNG GEORGE HON CHEUNG
IPC: B62M1/20
Filed: 1982-08-25
Abstract: This invention relates to a cycle wherein rotation of a drive wheel can be effected by the application of a force alternately to a pedal and to the saddle. In a preferred embodiment the cycle comprises a saddle (14), a crossbar (10) on which the saddle (14) is mounted, cranks (12), pedal cranks (13), pedals (16) and a force transmission member (11) for transmitting a force from the crossbar (10) to the cranks (12). The application of a force to the saddle (14) or to the pedals (16) causes rotation of the cranks (12) and the pedal cranks (13), which rotation is transmitted to a drive wheel (3) via a toothed driving gear wheel (7), an endless chain (8) and a driven gear wheel (9).
Patent ZA-835926-B (ZA)
Title: Photosensitive elastomeric polymer composition for flexographic printing plates,processable in semiaqueous basic solution or solvent
Inventor: WORNS JOHN R
IPC: G03F7/038
Filed: 1983-08-11
Abstract: A high molecular weight butadiene/acrylonitrile copolymer is used in a photosensitive composition containing the following: (A) 40 to 90% by weight of the total composition of a high molecular weight butadiene/acrylonitrile carboxylated copolymer having a number average molecular weight of 30,000 to 125,000, an acrylonitrile content of 10 to 50%, and a carboxyl content of 1% to 15% by weight. (B) 5 to 60% by weight of the total composition of a high molecular weight butadiene/acrylonitrile noncarboxylated copolymer having a number average molecular weight of 50,000 to 100,000, an acrylonitrile content of 10 to 30% so that the combination of the carboxylated and non carboxylated high molecular weight copolymers give a composition with a carboxyl content of 3 to 10%. (C) 2 to 40% by weight of the total composition of an addition photopolymerizable ethylenically unsaturated monomer and (D) 0.1 to 10% by weight of the total composition of a photoinitiator activatable by actinic radiation. A photosensitive flexographic plate comprises the above composition layered on a supporting substrate.
Patent ZA-836804-B (ZA)
Title: Pneumatically operated impact tool
Inventor: LINDBERG ERIC THOMAS
IPC: B25D17/11
Filed: 1983-09-14
Abstract: A plastic silencer (12) surrounds a compressed air tool (11) and forms an exhaust chamber (27) around the tool. Two exhaust tubes (31, 32) from the chamber (27) are to the greater part situated in the chamber. A number of holes (35, 36) have been drilled near the inlet ends of the tubes. As a result the building up of ice in the inlet is prevented.
Patent ZA-839373-B (ZA)
Title: Herbicidal agents
Inventor: HAUSMANN HEINZ
IPC: A01N25/02
Filed: 1983-12-19
Abstract: A known herbicide such as a urea, carboxylic acid ester, aminoacid, benzoic acid derivative, benzonitrile, phenol derivative, diphenyl ether, carbamate, phenoxyalkanecarboxylic acid, triazine, triazinone, triazinedione, heterocycle, dipyridil derivative or benzosulphonamide, is rendered more effective by being combined with a synthetic spreading agent such as a silicone oil, fatty acid ester or fatty alcohol, e.g. isopropyl myristate, metamitron, ametridion or methabenzthiazuran.
Patent ZA-843800-B (ZA)
Title: N-acetyl-p-aminophenol composition containing pertially gelatinized starch and method for preparing same
Inventor: SALPEKAR ANIL MANOHAR
IPC: A61K31/165
Filed: 1984-05-18
Abstract: An N-acetyl-p-aminophenol composition capable of being directly formed into a tablet having high hardness, short disintegration time and short dissolution time is disclosed. The composition includes N-acetyl-p-aminophenol, a pharmaceutically acceptable partially gelatinized starch, a pharmaceutically acceptable lubricant, water and optionally an auxiliary binder, an auxiliary disintegrant or both of these optional components. Also disclosed is a method for preparing the composition which includes forming a slurry containing the essential components (and optional components if desired) and spray drying the slurry.
Patent ZA-852318-B (ZA)
Title: Preparation of aldehydes
Inventor: BAHRMANN HELMUT
IPC: B01J31/00
Filed: 1985-03-27
Abstract: In the prodn. of aldehydes by reacting olefins with CO and H2 in the liquid phase in the presence of water and water-soluble Rh-phosphine complex cpds. (I) at 20-150 deg.C and 1-200 bar (100- 20 x 10 power 3 kPa), (I) contg. trisulphonated or tricarboxylated triarylphosphones (II) are used as catalyst and the reaction medium contains a solvent promoter (III). Pref. (II) is of the formula P(Ar1(X1M)(Y1n1))(Ar2(X2M)(Y2n2)) (Ar3(X3M)(Y3n3))(IIA): Ar1, Ar2 and Ar3 = phenyl or naphthyl gps.; esp. phenyl; Y1, Y2 and Y3 = linear or branched 1-4C alkyl, alkoxy, halogen, OH, CN, NO2 or R1R2N- gps.; R1 and R2 = linear or branched 1-4C alkyl; X1, X2 and X3 = a carboxylate (COO-) and/or sulphonate (SO3-) gp.; esp. a sulphonate gp.; n1, n2 and n3 independently = 0-5; M = an alkali alkaline metal, Zn, NH4 or quat. ammonium of the formula N(R3R4R5R6)+; R3, R4, R5 and R6 = linear or branched 1-4C alkyl.
Patent ZA-865991-B (ZA)
Title: Self-engaging separable fastener
Inventor: PROVOST GEORGE A
IPC: A41F1/00
Filed: 1986-08-08
Abstract: A self-engaging separable fastener is disclosed which comprises a base member (16) of woven separable fastener material having at least two adjacent mating fastener sections (12,14). At least one section (12) is defined by a plurality of loops (18) upstanding from the base member (16), and the other section (14) is defined by a plurality of hooks (20') upstanding from the base member (16). The loops (18) are formed of respective generally parallel rows of multifilament yarns interwoven into their respective base section so as to repeat the same loop direction and construction every predetermined number of picks and the hooks (20') are cut from respective generally parallel rows of loops (20) of monofilament yarns interwoven into their respective base section so as to repeat their loop direction and construction every pre­determined number of picks, which latter number of picks is greater than the number of picks in which the direction of the multifilament loops (18) is repeated. The density of the monofilament hooks (20') is less than the density of the multifilament loops (18) such that the sections of fastener material may be placed in face-to-face engagement by folding one section over the other and pressing the surfaces together and separated by peeling forces normal to the interfacial plane of engagement. Preferably, the loops (18) repeat themselves every four picks and the hooks (20') repeat themselves every eight picks.
Patent ZA-868613-B (ZA)
Title: Method for melting and reducing chrome ore
Inventor: MORI HAJIME
IPC: C22B5/10
Filed: 1986-11-13
Abstract: A method for melting and reducing chrome ore, which comprises charging chrome ore and carbonaceous material, and blowing in oxygen gas under a pressure ranging from 1 to 600 Torr, while molten metal (7) is being stirred by a stirring gas blown in. In this method, reaction vessel (1) capable of allowing top blowing and bottom blowing onto the molten metal and decreasing pressure within the vessel is employed. Chrome ore and carbo­naceous material can be used in the form of lumps or powder. When powdered ore and material are used, they can be injected through lance (2) or tuyere (3) into the vessel.
Patent ZA-877719-B (ZA)
Title: Immunoassay based on two enzyme inhibition system
IPC: C07F9/12
Filed: 1987-10-14
Abstract: A method for enzyme immunoassay for a ligand suspected to be present in a liquid sample includes signal amplification by use of at least two enzymes and a blocked modulator for one of the enzymes. Ligand present in the liquid binds to an antiligand and an enzyme-labeled tracer. The resulting bound fraction is separated and the enzyme in the tracer removes the blocking group from the blocked modulator. The modulator activates or inhibits a second enzyme which catalyzes the conversion of a substrate to a product. The presence or absence of the ligand in the liquid is indicated by a signal, such as a color change or a rate of color change, associated with the product. The invention includes a new class of enzyme inhibitors and blocked inhibitors and a kit of materials useful for performing the method of the invention.
Patent ZA-893603-B (ZA)
Title: Improvements in or relating to chemical supply devices
Inventor: GARNETT RICHARD HENRY
IPC: A01M7/00
Filed: 1989-05-15
Abstract: PCT No. PCT/GB89/00500 Sec. 371 Date Oct. 23, 1990 Sec. 102(e) Date Oct. 23, 1990 PCT Filed May 2, 1989 PCT Pub. No. WO89/11219 PCT Pub. Date Nov. 30, 1989.A chemical concentrate metering device 16 is provided for an agricultural or horticultural or forestry sprayer system including a reservoir 2 for supplying a dilutant and a spray head 10 for spraying a mixture of the dilutant and a chemical concentrate. The metering device 16 comprises a conduit 17 having an inlet 18 for receiving dilutant from the system and an outlet 19 for supplying a mixture of the dilutant and a chemical concentrate to the system. In addition a seating 22 is provided for detachably receiving a receptacle 31 for supplying chemical concentrate and an injection orifice 26 opens into the conduit 17 and communicates with an outlet 35 of the receptacle 31 received in the seating 22 so as to enable chemical concentrate to be injected from the receptacle 31 into a flow of dilutant in the conduit 17. This enables the chemical concentrate to be supplied directly to the spray head or to an intervening storage tank prior to supply to the spray head, without risk of the user being contaminated by the chemical concentrate.
Patent ZA-905689-B (ZA)
Title: Insecticide compositions containing as active ingredient glufosinate or one of its salts
Inventor: BENOIT MARC
IPC: A01N57/20
Filed: 1990-07-19
Abstract: A method of combatting insects comprising contacting the insects with an insecticidally effective amount of at least one member of the group consisting of glufosinate of the formula    <IMAGE>  I  and its salts.
Patent ZA-914199-B (ZA)
Title: Raglan sleeve surgical gown
Inventor: DILLON JOHN JR
IPC: A41D13/12
Filed: 1991-06-03
Abstract: The present invention provides surgical gowns and other garments possessing the advantages of raglan sleeve construction in terms of comfort and freedom of movement, with improved manufacturing efficiency. The garment (100) of the present invention provides a raglan sleeve divided into an upper portion (20) and lower portion (30) joined approximately in the area of the bicep. Waste is greatly reduced by creating a shoulder portion from material removed to form the arm openings in the body portion of the garment. The shoulder portion (20) is attached to the body portion of the garment to form a raglan shoulder portion which extends to about the bicep of the wearer. A sheet of material is cut in a trapezoidal pattern to form a plurality of lower sleeve portions, each of which is attached to a shoulder portion. Gowns made in accordance with the present invention exhibit the flow and shoulder lines of a raglan sleeve construction while making efficient use of the fabric from which the gown is constructed. Methods of making garments such as surgical gowns are also disclosed. <IMAGE>
Patent ZA-918219-B (ZA)
Title: Process for preserving the mechanical strength properties of chemical paper pulps
Inventor: HOYOS MARC
IPC: D21C9/16
Filed: 1991-10-15
Abstract: PCT No. PCT/EP91/01906 Sec. 371 Date Apr. 15, 1993 Sec. 102(e) Date Apr. 15, 1993 PCT Filed Oct. 4, 1991 PCT Pub. No. WO92/07139 PCT Pub. Date Apr. 30, 1992.Process for preserving the mechanical strength properties of a chemical paper pulp, comprising two treatment stages by means of a peroxidic reagent, with the first stage in an acidic medium and the second stage in an alkaline medium, according to which a treatment by means of a reducing compound is interposed between the two stages.