baber/WOPTO huggingface dataset:
Patent HU-184806-B (HU)
Title: Process for preparing 3-methylene-azetidine derivatives
Inventor: IFJ CALE ALBERT D
IPC: A61P25/26
Filed: 1980-07-18
Abstract: This invention provides a novel class of 3-methyleneazetidines which include diphenylmethyl derivatives such as 1-isopropyl-3-diphenylmethyleneazetidine oxalate:    <IMAGE>   This illustrated 3-methyleneazetidine compound is characterized by a combination of pharmacological properties which are indicative of utility as a mood elevating therapeutic agent for relieving the symptoms of depression in humans. The illustrated compound exhibits an ED50 (tetrabenazine-induced ptosis) of 2.18 mg/kg in mice.
Patent HU-197158-B (HU)
Title: Convertible rotor for combine-harvesters
Inventor: DUNN NEIL C
IPC: A01F7/06
Filed: 1986-05-07
Abstract: A rotor for a rotary threshing combine which is readily adjustable to provide a great variety of threshing patterns to suit the particular crops and conditions of use. The rotor drum has a plurality of mounting lugs affixed thereto in an array that includes longitudinal, circumferential, and helical rows. A variety of differently shaped threshing elements, each designed for efficient operation under particular conditions, is provided and said elements and selectively and interchangeably and releasably connectable to the mounting lugs.
Patent HU-203424-B (HU)
Inventor: GRACZER JANOS
IPC: G09G3/04
Filed: 1989-04-25
Abstract: A találmány tárgya vasmag mágneses billénőlemezes vizuális információ kijelző elem mágneses gerjesztéséhez, amely kijelző elemben információ közvetlen vagy közvetett megjelenítésére alkalmas, megjelenítő felületre (2) merőlegesen vagy közel merőlegesen mágnesezett, vagy mágnesezett részekkel ellátott billenőlemez(ek) (3) van(nak), továbbá mágnestér előállására alkalmas, átpolarizálható remanens indukcióval rendelkező, a billenőlemezek(ben) (3) lévő állandó mágnesek) koercitív erejénél kisebb koercitív erejű kemény vagy félkemény mágneses vasmaggal (5) ellátott mágneses gerjesztő tekercse(i) (6) van(nak) és a gerjesztő tekercs(ek) (6) vasmagjá(ai)nak (5) a megjelenítő elem felőli végén(ein) a vasmag(ok) (5) kezdeti permeábilitásánál nagyobb kezdeti permeábilitású anyagból előállított alakos test(ek) (8) van(nak) szoros illesztéssel vasmag(ok) (5) végé(ei)hez illesztve. A találmánynak az a lényege, hogy a vasmag (5) megjelenítő felület (2) felőli homlokfelülete és az alaplemez (1) között az alaplemezen (1) előnyösen felfekvő, vagy ahhoz támaszkodó, a vasmag (5) kezdeti permeábilitásánál nagyobb kezdeti permeábilitású anyagból előállított terelőlemez (7) van elrendezve, amely terelőlemez (7) a síkjára merőleges oldalaival szorosan  HU 203 424 B A leírás terjedelme: 3 oldal, 1 rajz -1-
Patent HU-202658-B (HU)
Inventor: FODOR DEZSOE
IPC: G06F3/02
Filed: 1988-04-20
Abstract: A találmány szerint érzékelők vannak a gép(ek) kezelőjének az ujjaira, előnyösen az ujjhegyeire erősítve, és az érzékelők, az ujjhegyek egymástól való eltávolításával, illetve egymáshoz való közelítésével vezérelhető távolságérzékelők. A találmány egy kiviteli alakjánál az érzékelők a hüvelykujj (1) hegyére, valamint a többi, a mutatóujj (4), középső ujj (7), gyűrűs ujj (8) és kisujj (9) közül legalább az egyiknek, előnyösen a mutatóujjnak (4) a hegyére - vannak erősítve.  HU 202 658 A A leírás terjedelme: 10 oldal (ezen belül 4 lap ábra) -1-
Patent HU-201956-B (HU)
Title: Process for producing steroid-5alpha-reductase inhibitors and pharmaceutical compositions comprising same as active ingredient
Inventor: HOLT DENNIS ALAN
IPC: A61P43/00
Filed: 1988-04-28
Abstract: 7 Compounds of formula (I) :
     in which, inter alia, R 1  is H or C 1-8 alkyl and M is 0 or S, processes for their preparation, pharmaceutical compositions containing then and their use as inhibitors of 5-a-reductase in the treatment in the reduction of prostate size.
Patent HU-205469-B (HU)
Inventor: BARNA BENOE
IPC: G06F13/14
Filed: 1990-05-14
Abstract: A találmány tárgya vezeték nélküli válaszadó rendszer, amelynek digitális periférikus egységgel (2) kommunikáló, a periférikus egység (2) által szolgáltatott adatok begyűjtésére alkalmas központi egysége (l)van. A találmány lényege, hogy a központi egységben (1) a periférikus egység(ek)ben (2) lévő in-line átviteli egységgel, célszerűen rádió adó-vevővel (28) való kódátvitelre alkalmas in-line átviteli egység, célszerűen URH rádió adó (10) és URH rádió vevő (11) van elrendezve, továbbá a központi egységben (1) soros numerikus kóddal kommunikáló áramkör (12) van elhelyezve, amelynek bemenetelre pozíció-korrektor áramkör (6) és startjelképző áramkör (7), kimenetelre dióda mátrixon (15) át ÉS kapu (16) valamint kódbeazonosító és tároló áramkör (5), adatkiválasztó és címző korrektor (6) kapcsolódik, az ÉS kapu (16) bemenetére analóg-digitál átalakítón (14) keresztül az inline átviteli egység, célszerűen a URH rádió vevő (11), kimenetére az adatkiválasztó és címző áramkörhöz (4) csatlakozó kódbeazonosító és tároló áramkör (5) bemenete van kötve, az elektronikus számkijelzőhöz  (13) az adatkiválasztó és címző áramkör (4), a bemenetén START kapcsolóhoz (20), kimenetén START RS flip-flopon (17) keresztül adás RS flip-flophoz (18) és a startjel-képző áramkörhöz (7) kapcsolt START visszaszámláló (19) kimenete továbbá RÉSÉT kapcsoló (21) csatlakozik, valamint az adás RS flip-flopon (18) keresztül és közvetlenül az in-line átviteli egységhez, célszerűen az URH rádió adóhoz (10) lekérdező mátrix és tároló áramkör (8) van kötve. A kommunikáló áramkör (27) bemenetére analóg-digitál átalakítón (29) keresztül in-line átviteli egység, célszerűen a rádió adó-vevo (28) és vevőkód-beazonosító mátrix (24), kimeneteire stabilizált tápegység időzítő és kikapcsoló áramkör (22), válaszkód-kiválasztó és tároló áramkör (26), ÉS kapu (30) és a vevőkód-beazonosító mátrix (24) van kapcsolva, továbbá az ÉS kapu (30) és a vevŐkód-beazanosító mátrix (24) van kapcsolva, továbbá az ÉS kapu (30) bemenetére kódmátrixon (25) keresztül a válaszkód-kiválasztó és tároló áramkör (26) kimenete, kimenetére in-line átviteli egység, célszerűen a rádió adó-vevő (28) csatlakozik, (l.és 2. ábra)  l.ábra HU 205 469 B A leírás terjedelme: 6 oldal (ezen belül 2 lap ábra)
Patent HU-195421-B (HU)
Title: Process for producing melted antihistamine compositions
Inventor: WITHINGTON ROGER
IPC: A61K31/445
Filed: 1985-08-29
Abstract: ® A hot melt antihistamine composition is described that is suitable for the liquid filling of hard or soft shell capsules and provides a sustained release of the antihistamine.
Patent HU-196689-B (HU)
Title: Herbicides comprising fluorophenoxy-phenoxypropionic acid derivatives as active ingredient and process for producing the active ingredients
Inventor: ROGERS RICHARD B
IPC: C07C67/30
Filed: 1984-08-31
Abstract: Novel fluorophenoxyphenoxypropionates and derivatives thereof and compounds related thereto possess herbicidal activity selectively in the presence of broadleaf crops. Preemergent and postemergent applications are contemplated. 
     The compounds are of the formula
     wherein
     X represents -F, -Cl, -Br, -I, -CF 3 , -OCF 3 , -CF 2 CI, -CF 2 H or-CF 2 CCl 2 H; and   Z represents an organic moiety, the moiety containing N, O or S atoms, a metallic cation, an ammonium cation or an organic amine cation and is, or can be hydrolyzed and/or oxidized in plants or soil to, a carboxyl moiety that is in undissociated and/or dissociated form.   Preferably Z ist
     or an agriculturally acceptable salt, amide or ester thereof.   Also provided are novel intermediates of the formula
     wherein   Y is OH, NH 2  or N 2 ⊕ BF 4 ⊖, as well as herbicidal compositions and a method of controlling weeds by applying to them one or more of the active compounds of the invention.
Patent HU-188491-B (HU)
Inventor: MAGYAR ISTVAN
IPC: C10L10/00
Filed: 1983-09-26
Abstract: Die Erfindung betrifft eine verbrennungsverbessernde Zusatzmittelzusammensetzung zur Reinigung von Heizungsanlagen. Die erfindungsgemaesse Zusammensetzung enthaelt 15 bis 20 Gewichtsteile Ammoniumderivat, und zwar Ammoniumcarbonat und Ammoniumbicarbonat, 5 bis 40 Gewichtsteile Magnesiumderivate, und zwar Magnesiumoxyd und Magnesiumcarbonat, 5 bis 30 Gewichtsteile Natriumchlorid, 0 bis 30 Gewichtsteile Ammoniumsulfat, 1 bis 5 Gewichtsteile a-Naphtochinon, 0,1 bis 1 Gewichtsteile Kupfernaphtenat, 0,1 bis 1 Gewichtsteile Magnesiumstearat, 4 bis 9 Gewichtsteile Aluminiumoxyd und Eisen(III)-oxyd und 0 bis 6,5 Gewichtsteile Siliziumdioxyd und Calciumoxyd.
Patent HU-185353-B (HU)
Title: Seating the wheel set of railway vehicles in bogie
Inventor: KRAMER ROLF
IPC: B61F5/26
Filed: 1982-11-22
Abstract: 1. Bearing arrangement for supporting a wheel set of a railway vehicle in a boggle frame, the wheel set being mounted by means of axle bearing housings (4) or by means of axle bearing housings (4) and adapters (4a) without interposition of spring elements directly in the side cheeks (1) of the frame, the springing of the vehicle body being effected through a cradle of the bogie, the side cheeks (1) being connected to one another by a connection rigid against thrust forces, and there being provided at the topside of the axle bearing housing (4) or the adapter (4a) a supporting surface (13) on which the side cheek (1) is supported with an optionally plane supporting surface (20) of a supporting shoe (21) fast with the side check, and which is curved to be rotationally parallel to the wheel set, characterized in that the supporting surface (13) is formed on the axle bearing housing (4) or adapter (4a) by a separate stationary supporting plate (10), the supporting surface (20) of the supporting shoe (21) is plane or is concave from below about an axis extending parallel to the longitudinal direction of the bogie, and that between the two supporting surfaces there is mounted a roll rocker (15) provided with side guides (abutment surfaces 18 and abutment dogs 19) and having bearing surfaces (16 and 17) which so correspond to the supporting surfaces (13, 20 respectively) of the supporting plate (10) and of the supporting shoe (21), there being rotational symmetry with respect to these surfaces, that the supporting surface (13) of the supporting plate (10) has a smaller radius than the corresponding bearing surface (16) of the roll rocker (15), and the supporting surface (20) of the supporting shoe (21) has a larger radius than the corresponding bearing surface (17) of the roll rocker (15).
Patent HU-214323-B (HU)
Inventor: BRAENDSTROEM ARNE ELOF
IPC: C07D401/12
Filed: 1991-06-05
Abstract: A találmány tárgyát őmeprazől – 2-{[(3,5-dimetil-4--metőxi-2-piridil)-metil]-szűlfinil}-5-metőxi-1H-benz-imidazől – előállítására szőlgálójavítőtt eljárás képezi, amely szerint 2-{[(3,5-dimetil-4-metőxi-2-piridil)-metil]-tiő}-5-metőxi-1H-benzimidazőlt reagáltatnak m--klór-perbenzőesavval metilén-diklőridős őldatban 8,0–8,6 tartőmányba esőállandó pH-n, majd a reakcióeleg et vizes nátriűm-hidrőxid-őldattalextrahálják, és az elválasztőtt vizes fázisból valamilyen alkil-főrmiát hőzzáadásával kikristályősítják az őmeprazőlt. ŕ
Patent HU-187191-B (HU)
Title: Process for producing imidazo-benzodiazepines and pharmaceutical compositions containing them
Inventor: VLATTAS ISIDOROS
IPC: A61P43/00
Filed: 1982-12-06
Abstract: Die Erfindung betrifft psychoaktive und antiallergische Verbindungen der Formel
     worin jedes der Symbole R, und R 2  Wasserstoff, Niederalkyl, Niederalkanoyl, Halogen, Cyan. Carboxy, Niederalkoxycarbonyl, Carbamoyl, Sulfamoyl, Mono- oder Di-niederalkyl-(carbamoyl oder -sulfamoyl) bedeutet, C n H 20  fur Niederalkylen steht, welches die zwei Stickstoffatome durch 2 oder 3 Kohlenstoffatome trennt, und R 3  für Wasserstoff, Niederalkyl, Niederalkenyl, Niederalkynyl, Niederalkanoyl, Arylniederalkyl, Niederalkoxycarbonyl. Phenylniederalkoxy. carbonyl. oder (Hydroxy Niederalkanoyloxy. Aryloxy oder Niederalkoxvl-niederalkyl steht worin der Niederalkvlrest mindestens 2 Kohienstoffatome enthal; R 4  und R 5  unabhängig voneinander Wasserstoff, Niederalkyl, Niederalkoxy. Niederalkylthio, Halogen, Trifluormethyl, Hydroxy. Niederalkanoyloxy, Sulfamoyl, Mono- oder Diniederalkylsulfamoyl, und R 6  und R 7  Wasserstoff oder Niederalkyl bedeuten, ihre N-Oxide, ihre Niederalkyl quaternären Derivate. und Salze, insbesondere therapeutisch verwendbaren Salze mit Säuren oder Basen, von allen diesen Verbindungen. Sie können z.B durch Kondensation einer Verbindung der Formel III
     worin X eine zusammen mit Wasserstoff oder einem Aikan metall abspaltbare Gruppe bedeutet, mit einer Verbindung der Formel IV
     oder einem Alkalimetaliderivat davon hergestellt werden
Patent HU-195067-B (HU)
Title: Method and vessel and vessel set for raising ligneous plants particularly saplings
Inventor: HOEBOER ARPAD
IPC: A01G9/10
Filed: 1985-11-12
Abstract: The invention specifies a method, in particular for cultivating seedlings in pots provided with root-outlet openings, in which the pots are arranged in a vertical or approximately vertical position, while forming an air gap, corresponding to at least 5% of the pot length, from the soil or any other plane. For this purpose, the pots exhibit vertical ribs on the inner casing surface and a root-outlet opening in the region of the base.
Patent HU-200716-B (HU)
Title: Method for machining workpieces
Inventor: SHATUROV GENNADIJJ FILIPPOVICH
IPC: B23B1/00
Filed: 1985-05-23
Abstract: A method of machining of materials consists in that the main movement (V) and the feed movement (S) are communicated to the part (1) and/or to the cutter (2) provided with a cutting element (3) with a circular cutting edge (4) and that angular turns are communicated to the cutting element (4) about an axis (5) perpendicular to the plane of location of the cutting edge (4) thus enabling the replacement of the weared part of the cutting edge (4) for non-weared one. The angular turns are effected in one and the same direction within the limits up to the half of the angle  psi  of contact of the cutting edge (4) with the part (1), whereas the time of passage of the contact angle psi  by a certain point on the cutting edge (4) is provided to be sufficient to ensure a uniform wear thereof.
Patent HU-206875-B (HU)
Title: Process for producing carbamoyl-oxy-labdane derivatives and pharmaceutical compositions containing them as active components
Inventor: KOSLEY RAYMOND WALTER
IPC: C07D497/20
Filed: 1987-12-29
Abstract: The present invention relates to carbamoyloxylabdanes, intermediates and a process for the preparation thereof. The compounds of the invention exhibit intraocular pressure activity and can, therefore, be used as medicaments.
Patent IT-1241933-B (IT)
Title: Cable stripping device
Inventor: MUTSCHLECHNER HERBERT
IPC: H02G/
Filed: 1990-04-26
Granted: 1994-02-01
Abstract: The invention relates to a cable stripping device, consisting of a base element 1 in the shape of a handle on which is pivoted a jaw 2 with a pivot axis 3 transverse with respect to the longitudinal axis of the base element 1. The free end 2c of the moving 3a jaw 2 is of identical shape and complementary to the corresponding end 1c of the base element 1, these ends 1c, 2c carrying, in a transverse position with respect to the longitudinal axis of the device, a blade 12 which occupies segments of semi-circular notches 11 whose diameters correspond to the diameters of different electrical cables provided with an insulating sheath.
Patent IT-1233743-B (IT)
Title: Machine to manufacture a cleaning device, so called self-twisting mop or similar
Inventor: ANDREA BARGELLINI
IPC: D04H/
Filed: 1989-09-05
Granted: 1992-04-14
Abstract: The present device comprises: feeding devices (3, 5) for a ribbon shaped material; cutting devices to cut longitudinal material stripes; tubular flattened devices to guide single stripes in order to concentrate them in a bundle (Fo); a motion unit (32) provided with a sheath moving with alternated motion to collect said bundle. Said motion unit is also provided with annular pliers that hold the bundle, said pliers cooperating with the alternated motion of the sheath. The device also comprises fixed tubular elements at the end of said sheath, transversal cutting devices to separate said bundle (Fo) from single bundles of stripes having the necessary length for the device, a cot to collect and hold the stripe bundle and the divided bundle. Finally, it comprises holding devices and injection devices to form the nucleus (Figure 1).
Patent LV-14094-B (LV)
Title: A method of production of dried slices of jerusalem artichoke roots
Inventor: ROMANOVICS ORNETS
IPC: A23L29/244
Filed: 2009-12-21
Abstract: The present invention relates to a food processing industry and can be used in production of dried slices of Jerusalem artichoke roots. Jerusalem artichoke roots are washed, graded, inspected, given an additional rinse, cut into pieces and dried in an infrared dryer for 3 to 5 hours at a temperature of 600C to 650C.
Patent MX-166783-B (MX)
Title: Procedimiento de preparacion de compuestos heterociclicos aromaticos
Inventor: SHROOT BRAHAM
IPC: C07C51/15
Filed: 1985-10-01
Abstract: La presente invención se refiere a procedimiento de preparación de compuestos heterocíclicos aromáticos, caracterizado por el hecho de que consiste en proceder a una reacción de acilación entre un compuesto de fórmula: Ar-CO-Cl y un éster de ácido carboxílico.
Patent NO-140172-B (NO)
Title: Anordning ved fleksografisk farveverk.
Inventor: OTTER SASCHA RAOUL
IPC: B41F31/06
Filed: 1975-06-04
Abstract: Anordning ved fleksografisk farveverk.
Patent NO-155692-B (NO)
Inventor: SCHARWAECHTER PETER
IPC: C07D249/08
Filed: 1981-03-13
Abstract: 1. A 1,1-diphenyl-2-(1,2,4-triazol-1-1-yl)-ethanol of the general formula I  see diagramm : EP0036153,P8,F1  where one of the radicals R**1, R**2 and R**3 is chlorine and the others, which may be identical or different, are hydrogen or chlorine, and its pharmacologically tolerated salts as antimycotics.
Patent NO-157268-B (NO)
Title: Anordning til festing av et glass i en vindusramme.
Inventor: JEPSEN JENS
IPC: E06B3/62
Filed: 1982-02-23
Abstract: Anordning for innsetting av glass i en vindusramme, fortrinnsvis med et isolerglass, hvor anordningen omfatter et spor (6) i vindusrammen (5) for opptakelse av et kantparti av glasset (4), hvorved sporet delvis også er avgrenset av en flate (19) på et profillegeme (17). Anordningen er utformet for å lette monteringen av glasset og for å muliggjøre en materialbesparelse i selve vindusrammen. Anordningen kjennetegnes ved at det mellom sporets bunn (7) og glasset er anordnet et antall av sporets sidekanter. (8,9) stillingsfikserende holdere (10), som har slisser (15) med underskårne partier (16) for innsnepping av motsvarende partier (21) på et vinkelrett på glassets flate orientert parti (20) av profillegemet. som derved lukker sporets ytre parti og stillings-fikserer glasset. Holderne er også utformet for stort sett å fylle mellomrommet mellom glassets kant og sporets bunn, hvorved glasset er styrt i retningene for dets utstrekning.
Patent NO-154492-B (NO)
Title: Analogifremgangsmaate for fremstilling av terapeutisk virksomme forbindelser.
Inventor: FARMER JOHN BATES
IPC: C07D295/13
Filed: 1982-08-04
Abstract: Forbindelser med formel I. hvor Der en gruppe med formel II. hvor R-j_ og R, eller R, og R,, kan danne en kjede -CHCH-, eller R^ og R,, kan danne en kjede -CH.,-, R? eller hver av,og R,, er hydrogen, idet de gjenværende av R^ , Rog R4 , som kan være de samme j eller . forskjellige, er hydrogen, alkyl eller fenyl,. ingen, én eller to av R., R_, R_ og Rer. b / o y hydroksy og de gjenværende er hydrogen,. X er en kjede -(CH Z „) n- som eventuelt er substituert med hydroksy,. n er et helt tall fra og med 1 til og med 7,. D er hydrogen, alkyl, fenyl; alkylsubstituert med én eller flere av hydroksy, pyridyl, fenyl; eller alkyl substituert med fenyl som igjen er substituert med haiogen, aikyi, amme, aikoksy eller niFremgangsmåter for fremstilling av forbindelsene og farmasøytiske, f.eks. hjertestyrkende, preparater som inneholder forbindelsene, er beskrevet.
Patent NO-163600-B (NO)
Inventor: EFFENBERGER JOHN A
IPC: D06N7/00
Filed: 1984-04-13
Abstract: A novel composite comprises a substrate having a coating matrix including an initial layer of a perfluoropolymer and an overcoat comprising a fluoroelastomer, a fluoroplastic, a fluoroelastomer/fluoroplastic blend, or a combination thereof. The perfluoropolymer in the initial layer may be a perfluoroplastic, a perfluoroelastomer, or blends thereof. In a separate embodiment, the novel composite includes a substrate coated solely with one or more layers of perfluoroelastomer alone or as a blend with a perfluoroplastic. Where the substrate is not susceptible to hydrogen fluoride corrosion, the composite may include solely one or more layers of a blend of a fluoroelastomer and a hydrogen-containing perfluoroplastic. Cross-linking accelerators may be used to cross-link one or more of the resins contained in the coating layers. Each composite may be topcoated with the layer or layers of a fluoroplastic, fluoroelastomer, and/or a blend thereof. The composite is flexible, exhibits good matrix cohesion and possesses substantial adhesion of the matrix to the material acting as the reinforcement or substrate. A method for making such a composite comprises the unique deployment of a perfluoropolymer directly onto the substrate in a relatively small amount sufficient to protect the substrate from chemical corrosion without impairing flexibility, followed by the application of the overcoat layer.
Patent NO-157172-B (NO)
Title: Fremgangsmaate for fremstilling av metallselenat fra metallisk selen via selensyrling.
Inventor: BJOERNBERG ARNE
IPC: C01B19/00
Filed: 1984-08-14
Abstract: g Oppfinnelsen angår en fremgangsmåte ved fremstill-. ing av alkalimetallselenitt og alkalimetallselenat fra metallisk selen via selensyrling. Selenet oppløses i salpetersyre under dannelse av selensyrling som reageres med en alkalimetallbase under dannelse av alkalimetallselenitt. Det dannede selenitt blir derefter sprøyte-tørket. Det dannede selenitt blir alternativt oxydert ved forhøyet temperatur i basiske omgivelser ved en pH av 10-12 med hydrogenperoxyd som oxydasjonsmiddel for å danne selenat som derefter sprøytetørkes.Oppfinnelsen angår også produkter fremstilt ved fremgangsmåten. Produktene er beregnet for innarbeidelse i dyrefor eller matvarer (selenitt) eller i gjødnings-stoffer (selenat) for således å administreres til. mennesker og dyr som sporstoffer.
Patent NO-164294-B (NO)
Inventor: HUGHES LESLIE RICHARD
IPC: C07C255/49
Filed: 1985-03-06
Abstract: A compound of the formulawherein X has the formulawherein ring A is phenyl, naphthyl or heterocyclic; wherein R' is hydrogen, alkyl, alkanoyl or aroyl; wherein R<sup>2</sup>, R<sup>3</sup> and R<sup>4</sup>, which may be the same or different, each is an electron withdrawing substituent selected from halogeno, nitro, cyano, trifluoromethyl, alkylthio, alkylsulphinyl and alkylsulphonyl or each is hydrogen, alkyl, alkoxy or dialkylamino provided that when ring A is phenyl or naphthyl at least one of R<sup>2</sup>, R<sup>3</sup> and R<sup>4</sup> is an electron-withdrawing substituent; wherein R<sup>5</sup> and R<sup>6</sup>, which may be the same or different, each is hydrogen, halogeno or alkyl; wherein R<sup>7</sup> is alkyl or halogenoalkyl; and wherein R<sup>S</sup> is carbamoyl, alkyl, cycloalkyl, alkenyl, alkynyl, halogenoalkyl, halogenoalkenyl, halogenoalkynyl, alkanoyl, alkylcarbamoyl, dialkylcarbamoyl or aroyl; or wherein R<sup>8</sup> is alkyl or alkenyl which bears one or more substituents selected from cyano, carbamoyl, amino, hydroxy, alkanoyl, alkoxy, alkylthio, alkenylthio, alkylsulphinyl, alkenylsulphinyl, alkylsulphonyl, alkenylsulphonyl, alkanoylamino, alkoxycarbonylamino, alkylsulphonamido, alkylamino, dialkylamino dialkylsulphamoyl, aroyl, aryl, arylthio, arylsulphinyl, arylsulphonyl, heterocyclylthio, heterocyclylsulphinyl and heterocyclylsulphonyl; or wherein R<sup>8</sup> has the formulawherein ring B is phenyl, naphthyl or heterocyclyl and wherein R<sup>2</sup>, R<sup>3</sup> and R<sup>4</sup> have any of the meanings stated above, provided that when R<sup>7</sup> is methyl R<sup>8</sup> is not also methyl.