baber/WOPTO huggingface dataset:
Patent LV-10095-B (LV)
Title: Aromatase inhibiting 4(5)-imidazoles
Inventor: KALAPUDAS ARJA MARKETTA
IPC: C07D233/54
Filed: 1993-05-14
Abstract: Novel imidazole derivatives of the formula <CHEM> wherein R1, R2, R min 1 and R min 2, which can be the same or different, are H,CH3, C2H5, C3H7, OCH3, NO2, NH2, CN, CF3, CHF2, CHF2 or halogen; R min  is H or <CHEM> where R3 is H, CH3 or halogen; R4 is H or OH and R5 is H or OH or R4 and R5 together form a bond and n is 1 to 4, and their non-toxic salts exhibit aromatase and desmolase inhibiting properties. Selective aromatase inhibiting compounds are valuable in the treatment of estrogen dependent diseases, e.g. breast cancer or benign prostatic hyperplasia (BPH).
Patent LV-11095-B (LV)
Title: Method of producing of marzipan articles
Inventor: POLIEKTOVA TATJANA
IPC: A23G3/00
Filed: 1994-10-17
Abstract: The making of vitaminized marzipan bars consists of the following basic stages: preparation and boiling of marzipan mass, adding of other components, provided by prescription, and the mixing and forming of bars and, if necessary, coating. Vitamin C is introduced into the bar in the form of rose hip syrup in the amount of 7-10% of the total mass of the product, simultaneously with the addition of the taste and flavour forming components.
Patent LV-11324-B (LV)
Title: Method for the preparation of 3-hydroxy-5-£2-(dimethylamino)-ethyl|-2,3-dihydro-2-(4-methoxyphenyl)-1,5- benzothiazepin-4(5h)-one and use of the product for making pharmaceutically active compounds
Inventor: HYTOENEN MARTTI
IPC: A61K31/554
Filed: 1995-09-15
Abstract: A method for the preparation of 3-hydroxy-5-Ä2-(dimethylamino)-ethylÜ-2,3-dihydro-4-(methoxyphenyl)-1, 5-benzothiazepin-4(5H)-one and use of the product prepared by this method for making pharmaceutical compositions and pharmaceutically active compounds is disclosed starting with N-alkylation of 3-hydroxy-2,3-dihydro-4-(methoxyphenyl)-1,5-benzothiazepin-4(5H)-one with a (dimethylamino)ethyl halide wherein the N-alkylation reaction is carried out in a reaction mixture comprising 2-butanone and water. The product of this reaction and its salts have utility as pharmaceutically active compounds and as intermediates for making pharmaceutically active compounds. The disclosed method and use is simpler, more efficient and safer than prior known methods and produces a product of superior purity.
Patent LV-12109-B (LV)
Title: Apparatus for the extraction of peat
Inventor: HAMERLINSKI WACLAW
IPC: C10G1/06
Filed: 1998-03-05
Abstract: An apparatus for the extraction of peat comprising an outer tank (1) and an inner tank compartment (3) having perforated walls (4,23) and being the actual container for peat to be extracted. Feeding pipes (13) for the supply of extracting medium extend into the inner tank compartment (3) while at least one outflow opening (7-11) is connected to the outer tank (1). Between the inner tank compartment (3) and the outer tank (1), there is a free space (38) filled with extracting medium. Preferably, the medium is supplied to a plurality of orifices within the inner tank compartment (3), and particularly to at least two different levels.
Patent ME-00496-B (ME)
Inventor: LAHM GEORGE PHILIP
IPC: C07D417/12
Filed: 2006-12-27
Abstract: Izlažu se jedinjenja Formule 1, uključujući sve njihove geometrijskestereoizomere, N-okside i soli, u kojima A1,A2,A3,A4,A5 i A6 su nezavisno odabrani iz grupe, koju čine CR3 i N; uzuslov da su, u najboljem slučaju, 3 od A1,A2,A3,A4,A5 i A6 N;svaki R3 je nezavisno: H, halogen, C1-C6 alkil, C1-C6 haloalkil, C3-C6 cikloalkil, C3-C6halocikloalkil, C1-CS alkoksi, c1-Cs haloalkoksi, C1-CS alkiltio, c1-CS haloalkiltio,C1-C6 alkilsulfinil, C1-C6 haloalkilsulfinil, C1-C6 alkilsulfonil, C1-C6 haloalkilsulfonil,C1-C6 alkilamino, C2-C6 dialkilamino, -CN ili -N02 ;i R1,R2,R4,R6, W i n su, kao što su definisani u izlaganju.Isto tako, izložene su i smješe, koje sadrže jedinjenja Formule 1 i postupci zaobuzdavanje invertebratnih štetočina , koji obuhvataju dovođenje u kontaktinvertebratne štetočine ili njenog okruženja sa biološki delotvornom količinomjedinjenja ili smješe pronalaska.
Patent NO-132602-B (NO)
Inventor: SUGDEN D B
IPC: E21C31/02
Filed: 1970-08-17
Abstract: Vibratorsystemer og deres anvendelse i gruvemaskiner e.l.
Patent NO-147572-B (NO)
Inventor: LOCH WERNER
IPC: F16K11/087
Filed: 1980-02-01
Abstract: This mixing valve has a spherical plug to be operated by an operating rod, having communicating inlets and outlets which differ from one another each as to number and arrangement, formation and/or in size, so that the operating direction for varying the mixing ratio is reversed when the plug is rotated 180 DEG .
Patent NO-149204-B (NO)
Title: Fremgangsmaate ved sintring av roerformede keramiske deler
Inventor: DESPLANCHES GERARD
IPC: C04B35/113
Filed: 1980-08-19
Abstract: Fremgangsmåte ved sintring av rørformede keramiske deler, idet den del (8) som skal sintres anbringes i et kammer (1) som kan bringes til sintringstemperatur. Den rørformede del er utformet med et ekstra tykt. ytre veggparti (9) ved sin ene ende, og delen innfres i en åpning utformet i en plate som er anordnet inne i kammeret, på sådan måte at delen holdes opphengt i kammeret ved hjelp av nevnte parti med ekstra tykkelse, som hviler mot åpningens kant, mens et massivt materialstykke (10) som omfatter et propplegeme (11) og en skulder (12) utformet for å ligge an mot den indre kant av nevnte rørende, innføres i den rrformede del, hvoretter kammeret bringes til ønsket sintringstemperatur. Fremgangsmåtenenyttes fortrinnsvis for å fremstille faste elektrolyttrr av natriumoksyd- P aluminiumoksyd for elektrokjemiske natrium/svovel-celler.
Patent NO-152289-B (NO)
Title: Distanseelement for lastepaller
Inventor: NORDGREN HANS-ELOV
IPC: B65D19/40
Filed: 1981-08-13
Abstract: Et distanseelement for lastepaller og som omfatter en rørform-ig del, som oppviser dels en serie spisse festefliker (3a), som er bestemt for å trenge inn i og forbinde rørdelen med en dekkdannende del til lastepallen, dels en serie i rett vinkel mot festeflikene bøyde stoppeorganer (3), som i likhet med. fasteflikene er utført i ett stykke med selve rrdelen. Ele-. mentet er tilvirket av et tynnvegget platestykke som er gitt en polygonal rørform sett i tverrsnitt ved hjelp av aksialt utstrekkende bøyningskanter (7), som er beliggende i grensesoner mellom festefliker (3a) og stoppeorgan (3). Hvert og ett av rørveggpartiene, som er avgrenset av to tilgrensende bøyningskanter (7), og som er forbundet med nevnte stoppeorgan (3), utstrekker seg i vinkel mot to andre nærliggende og på begge sider derav liggende rrveggpartier (12).
Patent NO-153493-B (NO)
Inventor: KLAUS MICHAEL
IPC: A61K31/10
Filed: 1982-02-12
Abstract: This invention is directed to tetrahydronaphthalene and indane compounds and processes thereto. These compounds are useful as tumor inhibiting agents, in the treatment of neoplasms and dermatological conditions.
Patent NO-167302-B (NO)
Inventor: BAUMGARTEN JOERG
IPC: C02F3/00
Filed: 1984-04-05
Abstract: Waste water and/or outgoing air are purified by contact with a polyurethane hydrogel containing surface active coal, a polymer having cationic groups and cells having enzymatic activity and being capable of growth.
Patent NO-161620-B (NO)
Inventor: ROCH JOSEF
IPC: C07D487/04
Filed: 1985-06-21
Abstract: The invention relates to new compounds of general formula    <IMAGE> (I)  wherein R1 represents an alkyl group, R2 represents a hydrogen atom, an alkyl group optionally substituted (except at the  alpha carbon atom) by a hydroxy group, or represents a cycloalkyl group or an allyl, phenyl or benzyl group, R3 represents an allyl group, an alkyl group optionally substituted (except at the  alpha  carbon atom) by a hydroxy group, or represents a cycloalkyl group or R2 and R3 together with the nitrogen atom between them represent a straight-chained alkyleneimino group, the acid addition salts thereof, particularly the acid addition salts thereof with physiologically acceptable inorganic or organic acids which have valuable pharmacological properties, particularly a metastasis-inhibiting effect based on their selective tumour-PDE inhibiting effect, and pharmaceutical compositions containing these compounds or the physiologically acceptable acid addition salts thereof. The new compounds may be prepared according to methods known for analogous compounds.
Patent NO-163947-B (NO)
Title: Fortoeyningsanordning.
Inventor: POLDERVAART LEENDERT
IPC: B63B22/02
Filed: 1985-12-30
Abstract: En fortøyningsanordning omfattende et legeme på en avstand over bunnen av en vannmasse, såsom et tårn (1) som er plassert på bunnen (2) av vannmassen, idet tårnet (1) bærer en nedadragende konstruksjon(4, 5, 6)som er belastet av en vekt, hvilken konstruksjon kan svinge om en vertikal akse ved tårnets (1) topp og om en horisontal akse, og ved sin nedre ende er forbundet med en flytende anordning, såsom et fartøy (3), ved hjelp av én eller flere kabler. (7) eller stive armer, idet forbindelsespunktet mellom kablene eller de stive armer og den vektbelastede konstruksjon (4, 5, 6) er beliggende bortenfor tårnets (1) vertikale akse sett i retning bort fra den flytende anordning (3). I I
Patent NO-179818-B (NO)
Title: Ultrasonisk badekar
Inventor: VAGO ROBERT EDWARD
IPC: A61H33/00
Filed: 1989-03-29
Abstract: For å tilveiebringe ultrasonisk behandling av dyr, blir ultrasoniske belger i et frekvensområde mellom 15 kilohertz og 100 kilohertz tilfort vann (18) i et kar (16) med en effekt-tetthet mellom 0,1 og 5 watt pr. cm. Utstyret er i stand til å tilføre ultrasoniske balger med minst to effekt-tettheter i nærheten av delen av dyret der en av effekt-tetthetene er mer enn 15 watt pr. cmfor å sterilisere vannet (18) før pasienten kommer opp i karet (16) og det andre er mindre enn 15 watt pr cm.
Patent NO-176462-B (NO)
Inventor: LAIHO KALEVI
IPC: A23K20/20
Filed: 1990-02-27
Abstract: A mineral mix containing mineral substances in large quantity, and being granulated; the mix contains bonding agent 1.5 to 6% by weight, advantageously 2 to 5% by weight.
Patent NO-179772-B (NO)
Inventor: BALDRY MICHAEL GORDON CHARLES
IPC: A01K1/015
Filed: 1991-06-21
Abstract: PCT No. PCT/GB89/01525 Sec. 371 Date Jun. 12, 1991 Sec. 102(e) Date Jun. 12, 1991 PCT Filed Dec. 21, 1989 PCT Pub. No. WO90/07273 PCT Pub. Date Jul. 12, 1990.Small animal litter comprises an absorbent material containing an odor-reducing quantity of an aliphatic halo-nitro-bactericide such as those available under the Tradenames Bronopol, Bronidox or Myacide.
Patent NO-180417-B (NO)
Inventor: BOON PETRUS JOHANNES
IPC: A61K47/48
Filed: 1992-01-02
Abstract: This invention relates to the field of immune therapy of cancer, more specifically to immunoconjugates of a cytotoxic moiety with a targeting moiety, more specifically to immunoconjugates of antibodies or fragments or functional derivatives of antibodies coupled to a cytotoxic substance such as drugs, toxins or radioisotopes. It especially relates to the release of substances bound to a targeting moiety through the use of acid-cleavable linker molecules derived from compounds of formula I. <CHEM>  wherein: R1 = H, lower alkyl, -N-lower alkyl, -O-lower alkyl, -S-lower alkyl, -N-lower aralkyl, -O-lower aralkyl, -S-lower aralkyl, -N-lower alkylene, -O-lower alkylene, -S-lower alkylene, -N-lower aryl, -O-lower aryl, -S-lower aryl, R2 = H, lower alkyl, lower aralkyl, lower aryl R3 is <CHEM> or another chemical structure which is able to decolize the lone pair electrons of the Nitrogen and R4 is a pendant reactive group, capable of linking R3 to a carrier molecule, a proteinaceous substance, an antibody (fragment), a polymer or a nucleic acid.
Patent NO-180136-B (NO)
Title: Mobil radiotelefon
Inventor: CORNFORTH PHILIP EDWIN
IPC: H04B1/3877
Filed: 1992-03-24
Abstract: Mobil radiotelefon innbefattende en bærbar enhet (1) og en forsterkerenhet (3). En koaksial kabel (25) er anordnet for å tilveiebringe en forbindelse mellom mellomfrekvenssignalene frembrakt av forsterkerenheten og radiofrakvenssignalene frembrakt i den bærbare enheten (1).
Patent NO-178858-B (NO)
Inventor: ASK ANNA-LENA
IPC: A61K31/445
Filed: 1992-06-17
Abstract: Compounds of the formula IV for use as local anaesthetica and analgetica, as well as a method for their preparation, their pharmaceutical preparations and their use.    <IMAGE>  IV
Patent NO-179658-B (NO)
Inventor: KATISKO KEIJO
IPC: H04W24/00
Filed: 1992-11-24
Abstract: The invention relates to a device for looping a radio-frequency test signal transmitted by a transmitter section in a full duplex type transceiver to a receiver section for testing the transceiver. The device of the invention comprises mixing means (23, 28) for shifting the test signal from the transmitting frequency to the receiving frequency. Interference caused in the normal reception of the receiver by the test signal is prevented by switching means (31) positioned in a device output. The switching means separate the test signal from the input of the receiver between the test intervals. The device further comprises means (D1, 35, 36, 38) for supervising the operation of the switching means (31) by monitoring the signal level in the device output.
Patent SE-332146-B (SE)
Inventor: RYZNER C
IPC: F03C1/053
Filed: 1967-01-26
Abstract: 1,111,773. Hydraulic reciprocating motors. PAUL PLEIGER MASCHINENFABRIK. Nov. 18, 1966 [Jan. 26, 1966], No. 51837/66. Heading F1A. A hydraulic radial piston motor for driving a vehicle on roads or cross-country has pistons 3 with at least two working surfaces 7, 32 to which hydraulic pressure is selectively applied to provide high speed, low torque operation for road use or low speed, high torque operation for crosscountry use. Supply and exhaust manifolds 10 and 17 are alternately connected to the piston interior by a slide valve 8 actuated by an eccentric 9 on the motor drive shaft 6. A slide valve 25 associated with each piston is hydraulically actuated against a spring 27 to connect the piston interior to piston surface 32 when low speed, high torque operation is required. A spring-loaded sleeve 19 is slidable in piston 3 and sealingly engages the cylinder head 20. The pistons drive the shaft 6 through ring 23, rollers 4 and eccentric 5.
Patent SE-316033-B (SE)
Inventor: LESLIE M
IPC: G01N33/49
Filed: 1965-04-26
Abstract: 1,106,844. Counter. CUTLER-HAMMER Inc. 14 April. 1965 [27 April, 1964], No. 15914/65. Heading G4D. [Also in Divisions B1, B8 and G1] A numerical display device giving a continuous indication of the number of a test receptacle 9 associated with a moving conveyer chain 1 comprises a series of mechanical counter assemblies 123, each comprising a units wheel and a tens wheel with all the units wheels coupled to be driven in synchronism with the conveyer by way of a shaft 125. The connections of the units wheels to the shaft 125 are made so that the number exhibited by each successive display 123 is one greater than that of the preceding one. Each time the conveyer 1 moves one step the numbers on all displays 123 increase by one unit, so that the number associated with any particular receptacle 9 will always appear adjacent to that receptacle throughout its passage to the pick-up station 10. The last display 124, represents the location just previous to a sample pick-up station and may include additional digit wheels to indicate a complete sample number, the others giving only the last two digits of a complete identification number.
Patent YU-46886-B (YU)
Title: Postupak za dobijanje haloalkil tiazola
Inventor: MYLARI B L
IPC: C07D277/64
Filed: 1988-09-15
Abstract: POSTUPAK ZA DOBIJANJE HALOALKIL TIAZOLA, ili (C1-C4) alkil, X je hloro ili bromo, A predstavlja 6-člani karbociklični aromatični ili 5 ili 6-čani heterociklični prsten koji je po želji supstituisan jednim od jodo ili tri-fluorometiltio, ili jednim ili dva od fluoro, hloro, bromo (C1-C4) alkil, (C1-C4) alkoksi, (C1-C4) alkiltio, (C1-C4) alkilsulfinil, (C1-C4) alkil-sulfonil, ili trifluorometil, naznačen time, što reaguje haloacetonitril sa jedinjenje formule: u kojoj je A prethodno definisano, ili njegova hidrohalidna so, u prisustvu rastvarača (C1.C4) alkanola ili bez rastvarača, na temperaturi od 60В°C do 140В°C. Prijava sadrži još 1 nezavisan i 8 zavisnih zahteva.
Patent RS-51754-B (RS)
Inventor: BIERINGER HERMANN
IPC: A01N43/70
Filed: 2003-02-20
Abstract: Kombinacije herbicida sa efikasnim sadržajem komponenata (A), (B) i (C), pri čemu(A) označava jedan ili više herbicida iz grupe jedinjenja formule (I) ili njihovih soli,(B) označava jedan ili više herbicida iz grupe jedinjenja formule (II) i njihovih soli,(C) označava jedan ili više herbicida iz grupe jedinjenja sa sledećim sastavom(Cl)	Flumioksazin(C2)	Alahlor(C3)	Metolahlor(C4)	Acetohlor(C5)	Dimetenamid(C6)	Petoksamid(C7)	Atrazin(C8)	Simazin(C9)	Cianazin(C10)	Terbutilazin(C11)	Metribuzin(C12)	Izoksaflutol(C13)	Flutiamid(C14)	Terbutrin(C15)	Nikosulfuron(C16)	Rimsulfuron(C17)	Primisulfuron(C18)	Pendimetalin(C19)	Sulkotrion(C20)	Dikamba(C21)	Mezotrion(C22)	Linuron(C23)	Benoksacor(C24)	Metozulam(C25)	Flumetsulam(C26)	Setoksidim(C27)	Cicloksidim(C28)	Kletodim(C29)	Klefoksidim(C30)	Aklonifen(C31)	MCPA(C32)	2,4-D(C33)	Bromoksinil(C34)	Bentazon(C35)	Flutiacet(C36)	Piridat(C37)	Diflufenzopir(C38)	Karfentrazon(C39)	Klopiralid(C40)	Halosulfuron(C41)	Thifensulfuron(C42)	Prosulfuron(C43)	Tritosulftiron(C44)	Sulfosulfuron(C45)	Etoksisulfuron(C46)	Tribenuron(C47)	Amidosulfuron(C48)	Mekoprop(C49)	Dihlorprop(C50)	Fluroksipir(C51)	Profluazol(C52)	Amikarbazon(C53)	Trifloksisulfuron(C54)	Glufosinat(C55)	Glufosinat-amonijum(C56)	Gliphosat(C57)	Gliphosat-izopropilamonijum(C58)	Imazapir(C59)	Imazetapir(C60)	Imazametabenz(C61)	Imazamoks(C62)	Imazakin i(C63)	Imazapik (AC 263,222). Prijava sadrži još 8 patentnih zahteva.
Patent ZA-845294-B (ZA)
Title: Method for producing hydrocarbons
Inventor: WAKUI TADAHIRO
IPC: C07C1/12
Filed: 1984-07-10
Abstract: Contacting a mixture of hydrogen, carbon monoxide and/or carbon dioxide with an intimate mixture of a carbon monoxide and/or carbon dioxide reducing catalyst such as a Fischer-Tropsch catalyst, and a catalyst carrier comprising a metal oxide having a very narrow pore size distribution in the micropores within the range of between 10 and 100 Angstroms, to produce hydrocarbon mixtures useful in the manufacture of gasoline kerosene and light oil.
Patent ZA-853842-B (ZA)
Title: Herbicidal agent
Inventor: DISKUS ALFRED
IPC: A01N37/22
Filed: 1985-05-21
Abstract: 1. Herbicidal agent, characterized in that it contains, as the active constituent, the compound 0-(3-Phenyl-6-chloro-pyridazin-4-yl)-S-(noctyl)-thio-c- arbonate mixed with the compound 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine and a chloroacetamide of the general formula  see diagramm : EP0165393,P8,F1  in which R1  denotes an alkyl, alkoxyalkyl or pyrazol-1-yl-methyl radical and R2  denotes a phenyl, 2,6-dialkylphenyl or trimethylcylclohexenyl radical, the term alky or alkoxy in R1  and R2 comprising 1 to 3 carbon atoms.
Patent ZA-855156-B (ZA)
Title: Novel ether-oxides derived from cyclopropylphenols
Inventor: NAJER HENRY
IPC: C07C39/17
Filed: 1985-07-09
Abstract: The present invention relates to imidazolines of general formula (I) <IMAGE>  (I)  and the addition salts formed therefrom with the pharmaceutically acceptable mineral or organic acids, possibly having their own specific pharmacological properties. The invention further relates to the preparation of these products, to their use as new medicines and to the medicinal compositions containing them.
Patent ZA-862470-B (ZA)
Title: Wire drawing die
Inventor: BURNAND RICHARD PATRICK
IPC: B21C3/02
Filed: 1986-04-03
Abstract: A wire drawing die is provided which is characterised by containing a particular thermally stable diamond compact through which a hole is formed for receiving the wire to be drawn therethrough. The thermally stable diamond compact, which preferably has a hexagonal or circular shape in plan, comprises a mass of diamond particles present in an amount of 80 to 90 percent by volume of the compact and a second phase present in an amount of 10 to 20 percent by volume of the compact, the mass of diamond particles containing substantial diamond-to-diamond bonding to form a coherent, skeletal mass and a second phase consisting essentially of silicon, the silicon being in the form of silicon and/or silicon carbide.
Patent ZA-867456-B (ZA)
Title: Explosive projectiles
Inventor: YOUNG FREDERICK MYLES
IPC: F42B12/00
Filed: 1986-09-30
Abstract: An explosive projectile comprises a projectile casing, a high explosive charge filling a portion of the space inside the casing, an impervious case defining a detonation device cavity adjacent to a surface of the explosive charge, and located adjacent to the said surface of the explosive charge between the inside wall of the projectile casing and the impervious case, a pre-formed solid elastic sealant ring such that the seal effected by the sealant ring between the projectile casing and the impervious case is tightened if the pressure on the sealant ring from the material of the explosive charge increases.
Patent ZA-871104-B (ZA)
Title: Document bearing characteristic ink-printed indicia juxtaposed with corresponding characteristic synthetic watermarkk and method for producing same
Inventor: VALDERGHEM EDMUND G VAN
IPC: B41M1/30
Filed: 1987-02-16
Abstract: A document security system is provided by providing each document with a synthetic watermark, for instance using the process, compositions and apparatus disclosed in the aforementioned U.S. patent of Norris, et al and, within the perimeter of at least one of the symbols which is provided by the synthetic watermark, an identical complementary or otherwise corresponding symbol is printed using ink, paint, dye, stain or similarly contrastingly pigmented substance so as to create, in combination with the synthetic watermark a juxtaposition that can be looked-for as evidence that the document is genuine and its serial number unaltered.
Patent ZA-904224-B (ZA)
Title: Biologically active molecules
Inventor: JAMES STEPHEN
IPC: A61K39/395
Filed: 1990-06-01
Abstract: A peptide having primary structural homology to a sequence of amino acid residues of growth hormone releasing factor (GRF) in the region spanning positions 28-44 or antigenically or immunogenically equivalent peptides thereto, or salts thereof may be used in an antigenic formulation to potentiate the effects of growth hormone in a vertebrate.
Patent ZA-904225-B (ZA)
Title: Process for making cubic boron nitride from coated hexagonal boron nitride and abrasive particles and articles made therefrom
Inventor: CORRIGAN FRANCIS RAYMOND
IPC: C04B41/87
Filed: 1990-06-01
Abstract: Abrasive particles and articles made from cubic boron nitride derived from coated hexagonal boron nitride which is substantially free of oxides and volatile contaminants. Polycrystalline CBN is prepared from HBN by removing oxide from the surface of HBN particles to form HBN particles having a substantially oxide-free surface. The HBN particles having a substantially oxide-free surface are coated with an agent which is capable of preventing re-oxidation of the surface of the HBN particles to form coated HBN particles in a substantially oxide-free state. The coated HBN particles in a substantially oxide-free state are then converted to a polycrystalline CBN by direct conversion of HBN to CBN. Coating agents include metals, metal carbides, metal nitrides and metal borides. A preferred coating agent is titanium carbide.