baber/WOPTO huggingface dataset:
Patent RU-2041419-C1 (RU)
Title: Steam generator
Inventor: TKACHEV OLEG A
IPC: F22B21/02
Filed: 1991-03-05
Granted: 1995-08-09
Abstract: FIELD: power engineering. SUBSTANCE: furnace chamber 1 of steam generator is separated by pipes 5,6 into a set of sections 3,4 of different width. The width of the first of alternate sections 4 counted from walls of furnace chamber 1 is lesser than the width of the adjacent sections 3. The sections 4 are provided with dummy bottom 8 made of a fire resistance material and inclined at the natural cone angle of the material. The inserts between pipes 5,6 define with gas-dispensing grate 2 and the top part of furnace chamber 1 the bottom and top ports respectively, the total area of the first ports being equal or more than the area of the cross- section of sections 4 having dummy bottom 8. EFFECT: enhanced efficiency. 4 dwg
Patent RU-2011338-C1 (RU)
Title: Grubber for upkeep of machine-cut peat bogs
Inventor: GILMSON SOLOMON D
IPC: A01G23/06
Filed: 1991-03-14
Granted: 1994-04-30
Abstract: FIELD: peat industry. SUBSTANCE: grubber comprises vertically-movable frame with carrier rollers. Frame is articulated by coupling shackle with truck tractor. Working tool mounted on frame comprises central uprooting tooth, end teeth and undercutting thrust cutter. Working tool is linked with frame by longitudinal beams secured on uprooting teeth and consisting, each, of movable and fixed parts. Lengths of said fixed parts and that of movable beam portion installed on central uprooting tooth , and distance from suspension axle of movable beam portions to central uprooting tooth are 3-4 times the width of the undercutting thrust tooth. Lengths of fixed portions of beams are equal to one another while length of movable portion secured on central uprooting tooth is smaller than that of movable portions of end beams. EFFECT: improved design. 2 cl, 3 dwg
Patent RU-2017383-C1 (RU)
Inventor: KOGAN VILYAM A
IPC: A01F12/48
Filed: 1991-04-09
Granted: 1994-08-15
Abstract: Изобретение относится к сельскохозяйственному машиностроению и предназначено для использования в воздушно-решетных очистительных устройствах, например комбайнов. Целью изобретения является повышение эффективности выделения зерна из вороха путем снижения неравномерности обдува решет. Вентилятор содержит нагнетательный патрубок 1, между панелями 3 патрубка установлен направитель 4, дальняя от оси ротора 8 кромка которого выполнена прямолинейной. Кромка, ближайшая к оси ротора, содержит криволинейные участки. Отклонения от минимальной ширины направителя, замеренные в точках по его длине от одной боковой панели к другой, пропорциональны отклонениям от максимального значения величины расхода воздушного потока, замеренным в аналогичных точках по длине направителя с прямолинейной ближней кромкой. 2 ил.
Patent RU-2011621-C1 (RU)
Title: Device for transport of liquid through pipeline
Inventor: MIKHAJLOV ALEKSANDR G
IPC: B65G53/50
Filed: 1991-04-22
Granted: 1994-04-30
Abstract: FIELD: hydraulic transport. SUBSTANCE: the device has a vibrator with a link, connected with a plate located inside the pipeline and extending in parallel with its walls that are isolated from vibration by flexible spacers to be found on the pipeline walls. EFFECT: facilitated procedure. 1 dwg
Patent RU-2012086-C1 (RU)
Title: Device for division constituents of short-circuit current
Inventor: LYAMETS YURIJ YA
IPC: H01H83/22
Filed: 1991-04-18
Granted: 1994-04-30
Abstract: FIELD: electric engineering. SUBSTANCE: device has adaptive filter, oscillator and amplitude-phase corrector. Adaptive filter has setting unit, which output bus is connected to setting inputs of corrector which output bus serves as output bus of device. Spectral analyzer, harmonic components oscillator, subtraction unit, computing unit, solving unit, logarithmic unit are introduced to accomplish the goal of invention. First output bus serves for output of complex amplitudes of all harmonic components from input signal, second and third output buses serve for output of complex frequencies and complex factors. EFFECT: increased functional capabilities. 2 dwg
Patent RU-2001567-C1 (RU)
Inventor: NOVIKOVA GALINA V
IPC: A01K39/024
Filed: 1991-04-25
Granted: 1993-10-30
Abstract: Изобретение относитс  к сельскому хоз йству.  в частности к дезинфекции поени  птиц. Цель -  улучшение санации питьевой воды воздействием  электромагнитным полем высокой частоты, осуществл емым  путем изготовлени  поилки в виде  поильной чаши, которую окружает низкопотенциальный  электрод а высоколотенциальный электрод  размещен внутри поплавка и выполнен полым в  плане в форме эллипса
Patent RU-2016008-C1 (RU)
Inventor: MARKONRENKOV YURIJ A
IPC: C08K5/3467
Filed: 1991-05-30
Granted: 1994-07-15
Abstract: FIELD: footwear production. SUBSTANCE: rubber mixture contains, mass parts: butadiene acrylonitrile caoutchouc (content of acryl acid monomer units being 26-34% ), solid novolac phenol-formaldehyde resin 18-22, sulfur 1-15, 2-mercaptobenzthiazole 0.5-1.0, zinc oxide 6-12, hexamethylenetetramine 0.5-2, stearine 2-3, calcium stearate 0.5-1.5, colophony 1-2.7, phthalic anhydride 0.5-1.5, lithopone 1-2.5, lime 1-1.5, silica filler having specific surface 150 m 2 /g 4-8, leather filler 30-75. Mass portion of free phenol in mentioned above phenol-formaldehyde resin is not more 7.5%, dynamic viscosity of said resin being 80-180 mPa s. Wastes of Russian leather as shavings 5-10 mm is length, 1-5 mm in width and 0.5-2 mm in thick are used as mentioned above leather filler. Rubber prepared of proposed mixture has density 1.02-1.07 g/cm 3 , wear resistance 6.8-7.2 J/cm 3 , heat conductivity 0.028 103-112 kgf/cm 2 , vulcanization temperature being 125-135 C. EFFECT: improves quality of desired product. 2 tbl
Patent RU-2025342-C1 (RU)
Inventor: BRIZHINEV EVGENIJ P
IPC: B60T13/08
Filed: 1991-03-19
Granted: 1994-12-30
Abstract: Использование: в конструкциях прицепов легковых и грузовых автомобилей с гидравлической системой тормозов. Сущность изобретения: тормоз наката содержит сцепное устройство, установленное с возможностью возвратно-поступательного перемещения в корпусе дышла. Сцепное устройство жестко связано со штоком привода поршня главного цилиндра привода тормозов. Тормоз наката снабжен магистралью слива тормозной жидкости из главной тормозной магистрали в расширительный бачек главного цилиндра через электрогидрокран, получающий питание от сети внутреннего освещения прицепа посредством реле и срабатывающий по команде электросети фонарей освещения заднего хода. Положение электрогидрокрана контролируется сигнальной лампочкой, установленной на переднем борту прицепа в зоне видимости водителя и включаемой концевым включателем. Для аварийного отключения тормоза в случае неисправности электросети или электромагнита предусмотрена кнопка или кран. Во время торможения прицепа срабатывает датчик, включающий сигнальную лампочку. 2 з.п. ф-лы, 2 ил.
Patent RU-2011146-C1 (RU)
Title: Rocket shell fin
Inventor: ROGOV VLADIMIR A
IPC: F42B10/20
Filed: 1991-06-23
Granted: 1994-04-15
Abstract: FIELD: rocket shells. SUBSTANCE: fin of a rocket shell which body is made with longitudinal slots has blades inserted into these slots. Each fin blade is made with a bearing platform which width is larger than that of the slot in the shell body and is mounted in the body by a flexible member. EFFECT: improved structure. 3 dwg
Patent RU-2030248-C1 (RU)
Title: Method of manufacturing wire from hard deformable steel
Inventor: AFANASEV NIKOLAJ DMITRIEVICH
IPC: B22D19/02
Filed: 1991-06-04
Granted: 1995-03-10
Abstract: FIELD: manufacture of welded or fused wire. SUBSTANCE: composite ingot is manufactured by means of fusing of expendable electrode in the upper part of crystallizer into the gap between ingot reinforcing member and crystallizer. Reinforcing member is made up as thin-walled tube closed with covers on both sides. Tube is filled with ground alloying components, which have different fusing point. Chemical composition and mass of fusible electrode are similar to these features of the ingot base. Besides alloying components having higher fusing point are positioned in central part of core to improve process characteristics of the arc. EFFECT: improved processing. 2 cl
Patent RU-2011635-C1 (RU)
Title: Lateral clamping device for loader
Inventor: VASILENKO PETR P
IPC: B66F9/12
Filed: 1991-04-29
Granted: 1994-04-30
Abstract: FIELD: transshipment operations. SUBSTANCE: lateral clamping device has plate suspended to cargo lifting carriage and carrying lateral clamps rotatable relative to vertical axes. Cargo loader carries articulated spring-loaded brake beams and supports. The plate is provided with arresters of turn of clamps which are relatively spring-loaded and engageable with cable block drive. Ends of drive cable are fastened on movable brackets which are engageable with supports with the aid of slings and are provided with shoes engageable with guides. Guides are positioned on beams and are provided with stops engageable with body of loader with auxiliary cable block system. EFFECT: enhanced operating capability. 3 dwg
Patent RU-2000954-C1 (RU)
Inventor: TARANTSEV ALEKSANDR A
IPC: B43K27/00
Filed: 1991-09-26
Granted: 1993-10-15
Abstract: Сущность изобретени : ручка содержит трубчатый  корпус с носовой гильзой, средство дл  фиксации  пишущих стержней по длине, средство дл   фиксации наконечника пишущих стержней и колпачок  со скобой карманодержател . Средство дл   фиксации пишущих стержней по длине состоит из трубки с расположенной на заданном рассто нии  внутренней перемычкой с отверстием дл  прохождени  воздуха. Средство дл  фиксации наконечников  пишущих стержней состоит из ступеньчатой  фиксирующей втулки или двух ступенчатых фиксирующих  втулок Втулка выполнена с возможностью  уставки и съема в торцевое отверстие носовой  гильзы или корпуса. Корпус мржет быть выполнен в  виде стакана дл  нахождени  в нем нескольких запасных  стержней и других принадлежностей ручки.  5 з.п. ф-лы, 12 ил.
Patent RU-2047073-C1 (RU)
Title: Air surface condenser
Inventor: VASILEV YURIJ N
IPC: F28D7/00
Filed: 1991-10-04
Granted: 1995-10-27
Abstract: FIELD: steam turbine plants. SUBSTANCE: condenser has tubes 1 vertically arranged in housing 2 and secured in tube plates 3 and 4. Tube plate 3 is connected with steam header 5, and tube plate 4, with condensate header 6. Housing 2 in its lower portion is secured together with diffuser 7 accommodating axial fan 8 coupled with reducer 9. Tubes 1 have pin-like fins. EFFECT: enlarged operating capabilities. 5 dwg
Patent RU-2048892-C1 (RU)
Inventor: SHISHKIN VIKTOR V
IPC: B01J8/10
Filed: 1991-10-28
Granted: 1995-11-27
Abstract: Изобретение относится к обработке дисперсных веществ жидкостью, в частности к устройствам для проведения процессов выщелачивания промывки, растворения при контакте и жидкости твердого зернистого материала. Цель изобретения: упрощение конструкции устройства и повышение его производительности. Сущность изобретения: устройство состоит из корпуса, систем распределения текучей среды и зернистого материала, перемешивающего средства. Новым в устройстве является то, что в корпусе установлен барабан с намотанными на него лентами. По обеим сторонам барабана размещены торы. Ленты пропущены через центральные отверстия торов, охватывают их и закреплены внутри корпуса. Торы образуют полость, сообщенную с системой подачи рабочего агента. 1 ил.
Patent RU-2099340-C1 (RU)
Title: Method of synthesis of (6s)- or (6r)-tetrahydrofolic acid
Inventor: DR GANS RUDOLF MYULLER
IPC: C07B57/00
Filed: 1991-12-06
Granted: 1997-12-20
Abstract: FIELD: organic chemistry. SUBSTANCE: invention relates to a method of synthesis of (6S)- or (6R)-tetrahydrofolic acid or its salts with sulfuric or sulfonic acids. Method involves interaction of (6R,S)-tetrahydrofolic acid with sulfuric or the corresponding sulfonic acid. The obtained salt is subjected for fractional crystallization and if necessary the prepared salts were treated with a base. New salts of (6S)- and (6R)-tetrahydrofolic acid with sulfuric or sulfonic acids were obtained. The synthesized compounds were used in medicine. EFFECT: improved method of synthesis. 10 cl
Patent RU-2019602-C1 (RU)
Title: Washing machine
Inventor: EREMENKO ANATOLIJ I
IPC: D06F17/06
Filed: 1991-11-26
Granted: 1994-09-15
Abstract: FIELD: domestic appliances. SUBSTANCE: washing machine has tank with lid and agitator coupled to rotation drive. Laundry tank is made of shells installed telescopically which are interconnected with the use of ring seals. Inner shell is connected with its lower butt to base of body and outer one has flange in its upper part with eyes to accommodates rods which are hinged with one end to base. Base has locating arms manufactured in the form of lyre-shaped grips with restoring jaws interacting with the other ends of rods which have threaded sections and nuts. EFFECT: enhanced reliability of washing machine. 5 dwg
Patent RU-2016827-C1 (RU)
Title: Gas discharge system for storing volatile liquids
Inventor: BUTYRSKIJ VALENTIN I
IPC: B65D90/30
Filed: 1992-01-10
Granted: 1994-07-30
Abstract: FIELD: chemical industry. SUBSTANCE: system has inlet passage defined by vertical U-shaped pipe 10 secured to cover plate of tank 9 to communicate gas interior of the tank with passage of thermoelectric cooler-condenser, and cold radiators located in the passage. Lower portion of the passage upstream of the cover plate of the tank is thermally insulated. EFFECT: higher reliability of the system. 2 dwg
Patent RU-2018461-C1 (RU)
Inventor: GLOTOV GENNADIJ F
IPC: B64C21/02
Filed: 1992-01-09
Granted: 1994-08-30
Abstract: Изобретение относится к области управления летательным аппаратом при сверхзвуковых скоростях полета. Устройство для фиксации скачков уплотнения в сверхзвуковом потоке состоит из сопла с дозвуковым и сверхзвуковым участками. Дозвуковой участок выполнен в виде цилиндра, а сверхзвуковой - в виде призмы, сечение которой в носовой части треугольной формы, а в кормовой - круглое, причем угол полуклина призмы составляет 12 - 30°. Изобретение позволяет повысить эффективность устройства. 5 ил.
Patent RU-2036021-C1 (RU)
Title: Device for application of polymer powder coatings
Inventor: LEONOV BORIS P
IPC: B05B5/03
Filed: 1992-04-17
Granted: 1995-05-27
Abstract: FIELD: application of polymer powder coatings. SUBSTANCE: installed in feeder is bent membrane with hole system. Electrizer is made in form of solid disk whose round end faces have spiral grooves. Inlet of each groove is connected with feeder inlet. Outlet of each groove is connected with electrizer outlet nozzle. Adjacent to each round end face of disk are dielectric plates with spirally arranged holes. Sum of cross-section areas of feeder membrane holes equals that of spiral channels of electrizer. EFFECT: higher efficiency and quality of coatings. 2 dwg
Patent RU-2048967-C1 (RU)
Title: Способ подготовки и смены металлоприемника на линии непрерывного горизонтального литья
Inventor: ZHELNIS MECHISLOVAS VINTSOVICH
IPC: B22D11/00
Filed: 1991-12-27
Granted: 1995-11-27
Abstract: Использование: литейное производство, в часности методы и средства выпуска расплава в процессе горизонтального непрерывного литья чугуна. Целью изобретения является сокращение простоев линии при переходе с одного профиля заготовки на другой, а также при аварийной остановке линии в случае прорыва жидкого металла. Сущность изобретения: согласно способу подготовки и смены металлоприемника на линии непрерывного горизонтального литья, включающему подготовку путем чередующихся выбивки и футеровки одновременно двух металлоприемников в специальных приямках, транспортировку и выставление подготовленного металлоприемника по литейной оси линии и закрепление на монтажной плите, предварительно устанавливают на монтажной плите вдоль оси вытягивания симметрично рабочему металлоприемнику второй металлоприемник с индивидуальным кристаллизатором, направленным в сторону, противоположную вытягиванию заготовки из первого металлоприемника, и при вынужденной остановке линии поворачивают плиту на 180°С и продолжают процесс непрерывного литья. 1 табл.
Patent RU-2011441-C1 (RU)
Title: Method of jet washing of suspended articles
Inventor: ALEKSEEV ANDREJ N
IPC: B08B3/02
Filed: 1992-04-09
Granted: 1994-04-30
Abstract: FIELD: chemical engineering. SUBSTANCE: method includes shaping directed washing jets by nozzles to provide parallel horizontal rows with shifting axes of jets of each subsequent row relatively to axes of jets of preceding row and supplying them to a surface of an article which moves with respect to the jets in vertical plane. EFFECT: enhanced quality of washing owing to selecting optimal shifting of jet axes. 4 cl, 2 dwg
Patent RU-2001588-C1 (RU)
Inventor: ROJTMAN FELIKS S
IPC: A23L2/02
Filed: 1992-05-07
Granted: 1993-10-30
Abstract: Изобретение относитс  к пищевой промышленности , а именно к производству соков Сок с м котью  абрикосовое пюре, сахарный сироп, дынное  пюре и лимонную кислоту при следующем соотношении  компонентов, мае % абрикосовое пюре 25 -  35; дынное пюре 15-20. сахарный сироп 44,5 -  59,7. лимонна  кислота 0,3 - 0.5
Patent RU-2023906-C1 (RU)
Inventor: KAKVAEV YUSUP TS
IPC: F03B13/22
Filed: 1992-05-14
Granted: 1994-11-30
Abstract: FIELD: sea wave energy conversion. SUBSTANCE: two anchored pontoons are fixed together to form wave intake canal. Pontoons are half-flooded and secured by struts. Sides of pontoons facing each other are of arched shape, wave intake canal is converging on both ends towards center of pontoons. Wave energy converters are installed in through crosswise bores made at smooth water level in pontoon bodies. EFFECT: improved efficiency. 1 dwg
Patent RU-2028745-C1 (RU)
Title: Pneumatic seeding apparatus
Inventor: BERTOV ANATOLIJ A
IPC: A01C7/04
Filed: 1992-07-17
Granted: 1995-02-20
Abstract: FIELD: farm machinery building. SUBSTANCE: this apparatus incorporates seeding chamber 1, vacuum chamber 2, seeding disc 8 having openings 7 for sucking seeds, and device for adjusting seed kicker for one-seed feed. Latter is transparent disc 5 having graduation marks for ascertaining that pins are set for single-seed feed. EFFECT: more sophisticated design. 2 dwg
Patent RU-2001962-C1 (RU)
Inventor: KOCHETOV GENNADIJ M
IPC: C02F103/16
Filed: 1992-07-23
Granted: 1993-10-30
Abstract: Использование: очистка сточных вод может быть использовано в частности, дл  извлечени  солей  никел  из сточных вод и осадков, образующихс  при никелировании металлических изделий  Сущность утилизацию солей никел  из осадков  сточных вод осуществл ют промывкой осадка водой , растворением его в серной кислоте, последующим  разделением фаз. после которого жидкую  фазу смешивают с раствором сульфата аммони  в  20 - 50% избытке от стехиометрии, отдел ют образовавшийс  осадок и подвергают его перекристаллизации .
Patent RU-2093553-C1 (RU)
Title: Method for producing vodka
Inventor: BLAZHIEVSKIJ EDUARD NIKOLAEVIC
IPC: C12G3/06
Filed: 1992-05-08
Granted: 1997-10-20
Abstract: FIELD: alcoholic beverage industry. SUBSTANCE: method involves continuous preparation of aqueous-alcohol mixture, its cleaning with activated carbon and solution of modified starch in amounts 0.5-0.8 kg and 2.3-3.0 kg per 1000 dal of ready-made product, respectively, filtrating and filling. EFFECT: higher efficiency. 3 tbl
Patent RU-2015824-C1 (RU)
Title: Method of continuous casting of metal
Inventor: LEBEDEV VLADIMIR I
IPC: B22D11/04
Filed: 1992-10-05
Granted: 1994-07-15
Abstract: FIELD: machine engineering; metallurgy. SUBSTANCE: combined mould has narrow walls and wide ones pressed against them. Metal is supplied to the combined mould, ingot is drawn at variable speed, mould is set to reciprocal motion, slag mixture is supplied to meniscus of metal, the mould is cooled by running water and the force of pressing of the wide walls against the narrow ones is measured at several levels over the length of the mould. When working pressing force is exceeded by 10-40%, flow rate of cooling agent under the mould increases by 5-20% from working value over the length of 0.8-0.2 from the ingot thickness. The walls are pressed by hydraulic cylinder, for instance. EFFECT: enhanced efficiency of casting. 2 cl, 2 dwg, 1 tbl
Patent RU-2008048-C1 (RU)
Title: Fire-fighting plant
Inventor: ZAKHMATOV VLADIMIR D
IPC: A62C27/00
Filed: 1992-10-09
Granted: 1994-02-28
Abstract: FIELD: fire-fighting equipment. SUBSTANCE: fire-fighting plant has cluster of hoses 5 mounted on carriage. Each hose is provided with individual shock absorber 16 and is connected to system of automatic control of time of feeding charges of fire-fighting compound to place of fire. Each hose 5 accommodates ejection charge 9 and fire-fighting compound 8 contained in hermetically sealed enclosure 7 made from material easily destroyed be effect of shock wave. Ejection charge 9 and fire-fighting compound 8 are separated from one another and from wall of enclosure 7 by means of closing plugs 10 and 12. EFFECT: enhanced fire-fighting capability. 4 cl, 4 dwg
Patent DE-10201601-C1 (DE)
Title: Internal combustion engine with crankshaft in crankcase, has starter/generator rotor formed on crankshaft in axial position of balance weight(s) or crank web, stator fixed relative to crankcase
Inventor: SZEKELY BELA
IPC: F02N11/04
Filed: 2002-01-16
Granted: 2003-06-05
Abstract: The internal combustion engine has a crankshaft (6) mounted in a crankcase (2) and a starter/generator mounted on the crankshaft. The rotor (12) of the starter/generator is formed on the crankshaft in the axial position of at least one balance weight (11) or a crank web of the crankshaft and the stator (15) is fixed with respect to the crankcase.
Patent DE-10217691-C1 (DE)
Title: Dental training apparatus for learning and practicing dental treatment techniques on jaw model, releases tooth when appropriate force characteristics are measured
Inventor: RIENER ROBERT
IPC: A61C19/00
Filed: 2002-04-19
Granted: 2003-06-18
Abstract: An upper jaw model is connected via a moment-of-force measuring device (3) with six degrees of freedom. Teeth (2) are releasably connected to the jaw by a controllable electromagnetic holding device (5). A comparator and decision device receives the output from the measuring device, and transits a control signal to the holding device to release the tooth according to the magnitude, direction of action, or variation with time of the force or moment, after force is applied to the tooth.
Patent DE-19501317-C1 (DE)
Title: Wet chemical metallisation of plastic felt or foam
Inventor: KISTRUP HOLGER DR RER NAT
IPC: H01B1/22
Filed: 1995-01-18
Granted: 1995-08-17
Abstract: A wet chemical process for metallising electrically non-conductive, chemically preactivated plastic substrates, esp. non-woven fabric, needled felt or open-pore foam, comprises treatment with a metallising soln., removing the soln. under gravity or by centrifuging, removing residues by washing with water, and reinforcing the deposited metal by electroplating. The metallising soln. used is a mixt. of fresh soln. (A) and modified, used and/or excess electroplating soln. (B) in which 1-40% of the total dissolved Ni comes from the used soln. (B).
Patent DE-19515608-C1 (DE)
Title: Borosilicate glass with linear thermal expansion
Inventor: STIEBERT DIETMAR
IPC: C03C3/093
Filed: 1995-04-28
Granted: 1996-08-08
Abstract: Borosilicate glass has a linear thermal expansion of 3.9-4.5 \* 10<-6>K<-1> at 20-300  deg  C, a processing temp. at 10<4> dPas of 1200-1270  deg C, a viscosity of 10<2.6>-10<2.8> dPAs at 1550  deg C, a specific electrical resistance of 20-33 ohm at 1550  deg  C and an electrical conductivity of 3.0-5.0 S/m at 1550  deg  C. The glass melts at 1600  deg  C at a rate of 0.3-0.5 mm/min. and has a compsn. (in wt.%): 77.0-81.0 SiO2 + ZrO2; 16.0-18.5 B2O3+Na2O+K2O+CaO+MgO+BaO (including 5.4-7.0 as  Na2O+K2O+CaO+MgO+BaO, and up to 0.9 as CaO+MgO+BaO); 3.7-4.9 Al2O3; and 0.05-0.4 Cl<->. The ratio (CaO+MgO+BaO)/ZrO2 = 0-1.5; and the ratio (Na2O+K2O+CaO+MgO+BaO)/(B2O3+SiO2+Al2O3+ZrO2) = 0.06-0.075.