baber/WOPTO huggingface dataset:
Patent PT-100226-A (PT)
Title: Process for manufacturing a component of a footwear article
IPC: B29C/
Filed: 1992-03-11
Abstract: Process characterized by starting from a microporous compound in its normal state of presentation, for example in the form of sheets 1 or of other similar articles, and, by means of a process which should preferably be a cutting process, individual components are obtained which just on their own or combined with other components obtained in an identical manner determine the formation of a basic element or first form 2 which is then introduced into a mould 3 in which, through the application of heat, the said basic element 2 will be moulded until it acquires it final definitive form 4, according to a level of moulding which, owing to the fact that the starting point is the said basic element or first form, is sufficiently low such that, when moulding thereof is completed, it is possible to obtain rapid cooling and, as a consequence of all this, good stability of the component 4 of a footwear article.
Patent PT-102324-A (PT)
Title: Improvements to machines for washing olives
Inventor: GIMENEZ MIGUEL SEGURA
IPC: A23N12/00
Filed: 1999-06-23
Abstract: The invention relates to improvements in machines for washing olives that consist, respectively, of devices 6 for removing sticks that accompany the olives and the sludges that form in the water tank 2, such that the device for removing sticks 6 is located downstream of the perforated vibrating tray 5 that removes the greater part of the water that the olives carry with them and consists of a series of parallel tubes appropriately separated from one another at equal distances that are housed in a bench provided with anti-friction bearings, such that the aforesaid tubes mesh with a mechanism that provides its rotation in the advance movement of the olives, there being, around same, metal rings arranged in a staggered arrangement to assist the advance of the sticks perpendicular to the tubes, whilst the device for removing sludges is in the water tank 2 and comprises a high-flow-rate pump, a solids-retention filter at the entry thereto, a centrifugal filter, a pneumatic sludge- evacuation system and a diffuser. <IMAGE>
Patent PT-103307-A (PT)
Title: Articulação para escadas
Inventor: MADUREIRA SALEMO DE ALMEIDA
IPC: E04F11/06
Filed: 2005-07-12
Abstract: O PRESENTE INVENTO, DIZ RESPEITO A UMA ARTICULAÇÃO PRÓPRIA PARA SER APLICADA EM ESCADAS ARTICULADAS SIMPLES COM DOIS OU MAIS SECTORES DE DEGRAUS, EM ESCADAS ARTICULADAS EXTENSÍVEIS OU EM ESCADAS TELESCÓPICAS. ESTA ARTICULAÇÃO TEM BRAÇOS ALONGADOS QUE APRESENTAM PRÓXIMO DOS EXTREMOS VAZAMENTOS DE CONFIGURAÇÃO GEOMÉTRICA DIVERSA, SENDO ESTA CONFIGURAÇÃO GEOMÉTRICA SEMPRE IGUAL À PERIFERIA DO PERFIL UTILIZADO NOS DEGRAUS DA ESCADA; OS VAZAMENTOS (1 E 2) PERMITEM QUE O DEGRAU MAIS PRÓXIMO DA ARTICULAÇÃO (3) POSSA SER APLICADO ATRAVESSANDO O BRAÇO DA ARTICULAÇÃO E A ABA ONDE ESTE FOI ENCAIXADO, DE MODO A SER ABOCARDADO PELO EXTERIOR (4), AJUSTANDO E FIXANDO A ARTICULAÇÃO.
Patent PT-104476-A (PT)
Title: Recipiente biodegradável e fertilizante para germinação de plantas
Inventor: BARTOLO PAULO JORGE DA SILVA
IPC: A01G9/00
Filed: 2009-03-26
Abstract: ESTA INVENÇÃO VISA UM TABULEIRO SEPARÁVEL EM VASOS INDIVIDUAIS, CONSTRUÍDO NUM MATERIAL BIODEGRADÁVEL COM FERTILIZANTE ORGÂNICO INCORPORADO. O SEU DOMÍNIO DE APLICAÇÃO É A AGRONOMIA. DESTINA-SE A GERMINAÇÃO DE SEMENTES PARA POSTERIOR PLANTAÇÃO EM SOLO ARÁVEL. ACTUALMENTE EXISTEM DOIS TIPOS DE TABULEIROS, OS QUE SÃO PRODUZIDOS EM POLÍMEROS SINTÉTICOS COM FERTILIZANTE INCORPORADO E OS QUE SÃO PRODUZIDOS EM MATERIAL BIODEGRADÁVEL. ESTE TABULEIRO POSSUI EM SIMULTÂNEO AS DUAS CARACTERÍSTICAS. AQUANDO DA PLANTAÇÃO A PLANTA NÃO É RETIRADA DO TABULEIRO POIS ESTE SEPARA-SE EM VASOS INDIVIDUAIS E É COLOCADO NA TERRA ONDE SE DEGRADA E FERTILIZA A PLANTA. ASSIM SENDO RESOLVE O PROBLEMA DE POLUIÇÃO DOS FERTILIZANTES QUÍMICOS E DO POLÍMEROS USADOS ACTUALMENTE.
Patent PT-110618-A (PT)
Title: Dispositivo de retenção de uma lente oftálmica em bruto por suportes de vácuo.
Inventor: BRUNO ANDRÉ MARINHO BARROS
IPC: B24B41/06
Filed: 2018-03-13
Abstract: TRATA-SE DE UM DISPOSITIVO DE RETENÇÃO DE LENTES EM BRUTO, NA FASE DE POLIMENTO, COM RECURSO A SUPORTES DE VÁCUO. UMA BOMBA (A) É LIGADA ATRAVÉS DE UM CANAL DE EXTRAÇÃO DE VÁCUO (2) A UMA CÂMARA DE VÁCUO (5) VEDADA, ONDE ENCAIXA O SUPORTE DE RETENÇÃO (10) DA LENTE EM BRUTO (12). O SUPORTE DA RETENÇÃO DA LENTE CONTÉM UMA VÁLVULA, CONSTITUÍDA POR UMA MOLA (7), VEDANTES DA VÁLVULA (4), TAMPA DA VÁLVULA (11) E MEMBRANA DE BORRACHA (8).QUANDO O SUPORTE DE RETENÇÃO (10) DA LENTE EM BRUTO (12) É ENCAIXADO NA CÂMARA DE VÁCUO (5) O PINO DE ABERTURA DA VÁLVULA (1) LEVANTA A MOLA (7), QUE FAZ COM QUE A ASPIRAÇÃO DO VÁCUO SE PROCESSE. UMA VEZ RETIRADO TODO O AR, E JÁ COM A LENTE IMOBILIZADA EM CONTACTO COM A MEMBRANA DE BORRACHA (8), TODO O DISPOSITIVO E LENTE É RETIRADO DA CÂMARA DE VÁCUO (5) VEDADA, E A MOLA (7) VOLTA AO SEU ESTADO INICIAL, BLOQUEANDO A PASSAGEM DE AR E, CONSEQUENTEMENTE, BLOQUEANDO A LENTE DURANTE O PROCESSO DE POLIMENTO.
Patent PT-116541-A (PT)
Title: Sistema universal de fixação a qualquer superfície e transporte de quaisquer objectos manuseáveis
Inventor: DIOGO PIMENTEL FERREIRA DE MAGALHÃES SANT'ANA
IPC: A45F5/02
Filed: 2020-06-29
Abstract: CONSTITUÍDO POR DUAS PEÇAS: PEÇA FÊMEA EM FORMA DE PARALELEPÍPEDO COM UMA FALHA EM V NA PARTE SUPERIOR (1), PARA AJUSTE DA PEÇA MACHO, COM FACES LATERAIS (2) COM: OU TRÊS ORIFÍCIOS RETANGULARES, PARA PASSAGEM DE CORDA OU CABO; OU UM ÚNICO ORIFÍCIO RETANGULAR PARA A PASSAGEM DE UM CINTO; PEÇA MACHO COM FORMA EM ¿V¿ E ARREDONDADA (4) NAS ZONAS QUE SERIAM DE ARESTAS, SENDO A PARTE SUPERIOR (6) MAIS SALIENTE E A INFERIOR EM FORMA DE V, COM UM ORIFÍCIO CIRCULAR (5) NA ZONA DO VÉRTICE INFERIOR DO ¿V¿. A PEÇA FÊMEA PODE SER FIXADA, NA PARTE TRASEIRA (3), A SUPERFÍCIE OU VEÍCULO, COMO PODE SER ATRAVESSADA POR CINTO OU CORDA. ÀS PEÇAS PODERÃO SER ACOPLADOS ADAPTADORES PARA FIXAÇÃO A OBJETO CURVO PERMITINDO A UMA SOLUÇÃO INOVADORA NO DOMÍNIO DA TÉCNICA DE FIXAÇÃO UNIVERSAL DE OBJECTOS A UMA UNIVERSALIDADE DE SUPERFÍCIES BEM COMO O SEU TRANSPORTE À CINTURA
Patent RU-94006403-A (RU)
Inventor: BURKAL TSEV V A
IPC: B23K7/00
Filed: 1994-02-22
Abstract: FIELD: torch cutting devices. SUBSTANCE: device has head with the following components arranged in it: nozzle, gas generator with combustion chamber and prechamber, fuel supply line (fuel may be supplied tangentially relative to walls of nozzle), oxidizer supply line brought in communication with combustion chamber and prechamber by means of passages and igniter. Diameter of combustion chamber is more than that of prechamber. Fuel supply line is brought in communication with prechamber and prechamber is brought is communication with combustion chamber. Passage feeding oxidizer to combustion chamber is made in form of circular manifold which makes it possible to supply oxidizer to zone adjoining inner wall of combustion chamber. EFFECT: completeness of combustion, reduction of overall dimensions and mass. 5 cl, 2 dwg
Patent RU-94015951-A (RU)
Inventor: IVANOV A A
IPC: H02P6/00
Filed: 1994-04-28
Abstract: FIELD: electric drives of sound recorder tape transports. SUBSTANCE: motor comprises an electromechanical converter with an inductor employing permanent magnets and an armature winding whose sections are connected to the outputs of the frequency converter made as a voltage inverter, logic voltage unit, comparators, integrating circuits. Signals with a duration of 180, shifted relative to each other through 120 deg are formed at the outputs of the comparators by means of the integrating circuits. Under the action of these signals control signals are formed at the output of the logic unit, which switch the gates of the anode and cathode groups of the frequency converter providing for periodic connection of the armature winding sections to the power supply. Thus, a synchronous start of the motor is provided. In the duty of rotation the rotary electromotive force, induced in the armature winding sections, accelerates the moment of change-over of the frequency converter gates changing over the motor to position switching. In the control mode, when a current control signal is applied to the frequency converter supplemented input, a symmetric recharge of the integrating circuits and, consequently, symmetric actuation of the comparators in response to rotary electromotive force signals are provided. As a result, fluctuations of the electromagnetic moment, fluttering in the controlled rotation conditions are reduced, motor operating characteristics are improved. EFFECT: improved operating characteristics.
Patent RU-94025107-A (RU)
Inventor: TITKOV S N
IPC: C01F5/30
Filed: 1994-07-04
Abstract: FIELD: ore processing. SUBSTANCE: method involves ore grinding, its separation for mineral components, isolation of concentrated carnallite by vacuum-crystallization, countercurrent washing clay-slime dissolving waste, combined filtration of halite-slime dissolving waste. Process is carried out for two stages. At the first stage 75-90% halite is isolated from ore by flotation method to the foaming product. At the second stage the complete hot carnallite dissolving is carried out from dehydrated chamber flotation product and cleared solution saturated with magnesium, potassium and sodium chloride at 95-100 C is obtained followed by vacuum-crystallization of carnallite from it. EFFECT: increased effectiveness of carnallite ore processing. 3 cl, 2 tbl
Patent RU-94027753-A (RU)
Inventor: EMEL JANOV A L
IPC: F25B39/02
Filed: 1994-07-20
Abstract: FIELD: air-conditioning systems, mainly transport facilities. SUBSTANCE: air cooler has at least one flat multi-pass tube with outer fins which is connected to inlet and outlet manifolds; to reduce time and electric power required for thawing snow in the course of operation of air cooler, multi-pass tube provided with heat-generating elements is placed in one of its passages. Efficiency will be enhanced if this elements is placed in center passage or if it is fitted with additional heat-generating element; in this case, both heat-generating elements shall be arranged in end passages of tube. Longitudinal slot is made in outer wall of each end passage of tube to facilitate replacement of defective heat-generating elements. EFFECT: reduction of thermal resistance between heat exchange surface of air cooler and snow during thawing.
Patent RU-94028819-A (RU)
Inventor: IUNIKHINA V S
IPC: A23L7/10
Filed: 1994-08-01
Abstract: FIELD: child's nourishment and dietary. SUBSTANCE: the product for child's nourishment and dietary contains wheat germ flour, buckwheat or rice or oat flour, dries unskimmed milk and granulated sugar at the following relation of ingredients, mass percent: wheat germ flour - 8.0 to 10.0; buckwheat or rice or oat flour - 34.0 to 35.0; dried unskimmed milk - 41.0 to 42.0; granulated sugar - the rest. Wheat germ flour contains 35.6% of protein, which is two-three times higher than in crude grain. At its addition such a relation of proteins, fats and carbonydrates as 1:1:4 physiologically required for feeding of a healthy child is maintained. EFFECT: enhanced alimentary value, easily assimilable proteins, antiallergic action, ecologically pure product.
Patent RU-94031521-A (RU)
Inventor: SHUKUROV EH D
IPC: B28B5/02
Filed: 1994-08-30
Abstract: FIELD: building pieces production, equipment for bricks production in particular. SUBSTANCE: to simplify operation of ready pieces extraction from mould longitudinal walls 11 of mould in the apparatus are mounted fixed in frame. Bottom 4 is mounted so as to be capable to move along longitudinal walls 11 and to turn in respect to transversal side wall 5 mounted on adjacent bottom and behind longitudinal side walls 11 in direction of bottom 4 motion on guide 3, along which bottom is moving, there is salient curvilinear site. EFFECT: simplified operations of finished pieces extraction from moulds. 2 dwg
Patent RU-94035350-A (RU)
Inventor: SHUTKOV E A
IPC: B01D39/00
Filed: 1994-09-23
Abstract: FIELD: production of multilayer member of Shutkov's filtering medium. SUBSTANCE: multilayer member of Shutkov's filtering medium is made of in series located draining sieve filtering layers with mainly similar in limits of one layer equivalent diameters through holes. The holes are made for each layer considering character of statistic distribution of filtered particles according to their size. Transverse sizes of draining canals have size of no less than pores size in previous along filtering medium running layer. Multilayer member maximum service life is provided due to production of similar differences of pressure on filtering layers during their clogging. EFFECT: improved quality of filtration.
Patent RU-94036207-A (RU)
Inventor: PRESNJAKOV K A
IPC: E02B9/04
Filed: 1994-09-28
Abstract: FIELD: hydraulic engineering; automatic cleaning of water from suspended and bottom debris and its delivery to pumps as well as to open and closed irrigation systems. SUBSTANCE: water and debris diverting structure has headrace channel with cylindrical revolving screens placed therein coaxially to flow for rotation by means of turbines, each mounted on one end telescopically on pipes of forebay head structure and on other end, on water flow side, on supports installed on headwater channel bottom, discharge pipe, and emergency sill; seepage surface of screens is riffled; during installation, riffles on surface of one screen are set against depressions on surface of other one; screens rotate unidirectionally, for example, clockwise. EFFECT: improved efficiency of water cleaning from debris during its intake due to producing forces deflecting mechanical fragments from surfaces of revolving screens by inducing crosswise circulation process. 1 cl, 4 dwg
Patent RU-94038407-A (RU)
Inventor: ZHMOGINOV I L
IPC: B60C27/04
Filed: 1994-10-11
Abstract: FIELD: transport. SUBSTANCE: device has grouser 2 mounted on vehicle wheel by means of attachment unit 3. Shape of grouser corresponds to shape of working surface of tyre in cross section. Grouser is made in form of shoe consisting of several parts: side limiter 5 and two support parts 6 and 7. Part 6 is made in form of segment in development and is provided with cross protectors 8 over circumference of outer surface and with cuts subtending the protectors over circumference of inner surface. Second part 7 is made in form of rigid sector plate with attachment unit 3 in apex. Limiter 5 is made integral with curved segment part 6. Limiter 5 and sector part 7 are arranged symmetrically relative to part 6. Clamping device 16 has adjustable movable horizontal shaft 17 and tie bolts 19 located in corresponding projections on bases of support parts 6 and 7. EFFECT: enhanced reliability, facilitated removal of device. 4 cl, 6 dwg
Patent RU-94038419-A (RU)
Inventor: BYKOV G I
IPC: A23K3/00
Filed: 1994-10-11
Abstract: FIELD: agriculture; may be used in feed processing during chemical preservation of feed. SUBSTANCE: method involves chopping the starting raw materials; dispatching it for storage; preserving by electrochemically activated solution of common salt. Air-tightness, preparation and application of conserving agent are carried out in a single technological line. As a conserving agent is used both anolyte A of aqueous solution of sodium chloride received at the first electrodialysis, and anolyte A, A, ... Areceived at 1, 2, . . . n electrodialysis of mixture of aqueous solution of sodium chloride and catholyte received at 1, 2, ... n electrodialysis in ratio 1: (1-0.01 n). EFFECT: higher efficiency. 2 tbl
Patent RU-95100786-A (RU)
Inventor: SHAKUN A N
IPC: C10G35/085
Filed: 1995-01-17
Abstract: FIELD: petroleum processing. SUBSTANCE: process is carried out at elevated temperature and pressure in presence of catalyst on carrier composed of alumina with 5•10to 3•10mol % of ReO. Catalyst has sorption capacity 0.35-0.55 g 1,3,5-trimethylbenzene per 1 g of catalyst and contains (in wt %): platinum, 0.25-0.6; chlorine, 0.6- 1.5; or fluorine, 0.2-0.6; carrier, the balance. EFFECT: allowed operation at higher sulfur content in raw material; increased octane number of catalyzate.
Patent RU-95101694-A (RU)
Inventor: SOLOV EV S A
IPC: A01J7/00
Filed: 1995-02-03
Abstract: FIELD: agricultural equipment; animal husbandry. SUBSTANCE: according to method, meter measures amount of milk delivered from milking apparatus. To determine measuring error, amount of produced milk (substitute) is carried out from source irrespective of variations of vacuummetric pressure simultaneously checked by milk meter and testing unit for suction stroke or any other discrete time interval. Testing unit measures amount of produced milk independently from operation of milking apparatus, that is indications of testing unit are not influenced by external events. Measuring error of milk meter being tested is determined by comparing indications of meter being tested and of testing unit. EFFECT: high efficiency. 1 cl
Patent RU-95102178-A (RU)
Inventor: RAZIN D M
IPC: B65D88/12
Filed: 1995-02-15
Abstract: FIELD: transportation of liquids; heavy tank-trucks. SUBSTANCE: tank-truck has chassis 1, reservoir 2, hatch 3 with cover 4, baffle 5, drain branch pipe 6 with shutoff valve 7. shell of reservoir 2 is subjected to deformation to form on its side surface cross circular corrugations 8, with interruptions at base, forming channel "a" in inner space in non-deformed section along base for unobstructed draining of liquid remnants from tank. Corrugations 8 are directed with their crests inwards reservoir 2. EFFECT: enhanced adaptability to manufacture, reduce labor input and material usage owing to replacement of stiffening ribs imparting definite rigid shape to reservoir by corrugations made on side surface of reservoir. 1 dwg
Patent RU-95106169-A (RU)
Inventor: VOLCHKOV V V
IPC: B21J5/02
Filed: 1995-04-19
Abstract: FIELD: manufacture of rod articles having heads, for example, bolts for securing automobile wheels. SUBSTANCE: method consists in driving the cutting tool into end surface of head on side opposite to rod; part of bearing surface of head inside projection of cutting contour of tool is supported by die. EFFECT: considerable reduction of cutting effort.
Patent RU-95106636-A (RU)
Inventor: LITVIN S S
IPC: B65H3/16
Filed: 1995-04-21
Abstract: FIELD: transporting and sorting of printed sheets of paper. SUBSTANCE: separate paper sheets of printed matter produced by laser printers or photocopying machines are transported one by one with the help of magnetic field created for example by permanent magnet or electromagnet, and used as coupler for transporting means is toner possessing ferromagnetic properties and by which printed matter is produced. EFFECT: high efficiency.
Patent RU-95107651-A (RU)
Inventor: GUBERTUS KHENE
IPC: E01B25/30
Filed: 1995-05-15
Abstract: FIELD: overpasses for rail tracks. SUBSTANCE: elevated track has girders 10 resting on pillars 12, 14 which are installed on foundation embedded in ground 16. Pillars 12,14 are located at opposite sides 34, 36 of girders and arranged in pairs. To ensure required alignment of track, pillars 12, 14 which are corresponding to each other in pairs, are spaced from each other at ground level at distance which is less than distance at girder sides. Pillars are made for possible controlled displacement in required degree in plane perpendicular to longitudinal axis of track 18. Thus, track is laid at incline to horizon. EFFECT: high efficiency.
Patent RU-95108841-A (RU)
Inventor: MEL NIKOV V I
IPC: A61B17/16
Filed: 1995-05-30
Abstract: FIELD: medicine. SUBSTANCE: method involves applying operation instrument to bone surface at the place where the osteotomy is to be performed. A blow of needed intensity being delivered to the operation instrument, the operation instrument penetrates for S=(0.2 ÷ 1)H depth. The following blow is to be delivered next to it and so on until the bone is crossed at needed depth. EFFECT: reduced risk of traumatic damage of tissues.
Patent RU-95109175-A (RU)
Inventor: VALITOV R F
IPC: H04B7/185
Filed: 1995-06-02
Abstract: FIELD: radio communication. SUBSTANCE: lines which have final radio stations as well as if necessary arbitrary number of intermediate re-transmitting stations run preliminary homing of antennas according to program which is stored at each station. Then orientation of each antenna is adjusted simultaneously and separately in each link of transmission line. Firstly this is done in all region of program error and then in narrow region which embraces beam pattern and low-attenuated side beams of antennas during dynamic regulation of receiver sensitivity, when automatic tracking system and automatic regulator of static effect gain are switched off. This orientation is performed until signal is received for main beam pattern only. When continuous receiving mode is established, stations in transmission link are switched into normal operations mode. EFFECT: simultaneous orientation of beams of all antennas in links of transmission line for about 300 seconds while error in homing program is greater than width of antenna beam by factor of 50-60; this corresponds to possibility to increase emitted power of signal by factor of 2500-3600 and decreased power consumed by transmitter.
Patent RU-95111007-A (RU)
Inventor: GUCHIN E V
IPC: B27M1/04
Filed: 1995-06-27
Abstract: FIELD: wood treatment; manufacture of decorative wooden articles. SUBSTANCE: lower flat surface is not subjected to treatment and upper cylindrical surface and lateral surfaces are profiled. EFFECT: enhanced efficiency. 2 dwg
Patent TW-200304771-A (TW)
Title: Halonitrobutadienes
Inventor: FISCHER REINER
IPC: A01N43/40
Filed: 2002-11-04
Abstract: The present invention relates to novel halonitrobutadienes, to processes for their preparation and to their use for controlling animal pests. Compounds of the formula (I), in which A represents in each case optionally substituted cycloalkyl, heterocyclyl, aryl or hetaryl, R1 represents hydrogen or alkyl, R2 represents hydrogen or alkyl, Z represents halogen or NO2, Hal represents halogen, X represents OR3, SR3 or NR4R5, Y represents hydrogen, halogen, OR6, SR6 or NR7R8, R3 represents in each case optionally substituted alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, each of which is optionally interrupted by one or more heteroatoms, or represents in each case optionally substituted aryl, hetaryl, arylalkyl or hetarylalkyl, R4 and R5 independently of one another represent hydrogen, represent in each case optionally substituted alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, alkoxycarbonyl, each of which is optionally interrupted by one or more heteroatoms, or represent in each case optionally substituted aryl, hetaryl, arylalkyl or hetarylalkyl, or R4 and R5 together with the nitrogen atom to which they are attached represent an optionally substituted ring which is optionally interrupted by one or more heteroatoms, R6 represents in each case optionally substituted alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, each of which is optionally interrupted by one or more heteroatoms, or represents in each case optionally substituted aryl or arylalkyl, R7 and R8 independently of one another represent in each case optionally substituted alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, each of which is optionally interrupted by one or more heteroatoms, or represent in each case optionally substituted aryl, hetaryl, arylalkyl or hetarylalkyl, or R7 and R8 together with the nitrogen atom to which they are attached represent an optionally substituted ring which is optionally interrupted by one or more heteroatoms, or R2 and R3 together with the atoms linking them form an optionally substituted ring which is optionally interrupted by one or more heteroatoms, or R2 and R5 together with the atoms linking them form an optionally substituted ring which is optionally interrupted by one or more heteroatoms.