baber/WOPTO huggingface dataset:
Patent RU-2017390-C1 (RU)
Title: Method of turn drying
Inventor: TSUGLENOK NIKOLAJ V
IPC: A01F25/08
Filed: 1990-03-29
Granted: 1994-08-15
Abstract: FIELD: agricultural engineering. SUBSTANCE: redder is covered by an elastic film at an angle of no less than 45° to the horizontal plane with an air gap from 5 to 500 mm between the cover plane and the redder. The air is fed in two opposite flows into a pile of loose materials through an air channel. The waste air is removed through the gap between the redder and the elastic film. EFFECT: improved structure. 2 dwg
Patent RU-2018482-C1 (RU)
Title: Screw jack
Inventor: ELOYAN SERGEJ M
IPC: B66F3/08
Filed: 1990-03-14
Granted: 1994-08-30
Abstract: FIELD: self-propelled hoisting machines. SUBSTANCE: screw jack has body and rod mounted within it for engagement with support plate to form screw pair, rod grips with radial stops, drive stop pushers formed as horizontal magnetostrictive cores. Normally closed friction brake driven by vertical magnetostrictive cores is mounted on rod end. EFFECT: increased capacity and wider operational capabilities. 2 cl, 2 dwg
Patent RU-2014930-C1 (RU)
Title: Starting mechanism of pulse-type percussion installation
Inventor: NEVAR VYACHESLAV N
IPC: B21D26/06
Filed: 1990-06-14
Granted: 1994-06-30
Abstract: FIELD: sheet material pressure forming. SUBSTANCE: starting mechanism has a working cylinder with piston-valve in the form of a sleeve. A control cylinder is mounted successively with the working cylinder. The control cylinder has a piston with a stop on end portion of its rod. The working cylinder is mounted on a cover of a receiver with formation of an annular cavity, joined with an cover-striker cavity and with the receiver through ducts of the cover of the receiver. The duct axis are parallel to an axis of a body. A non-return valve is mounted in a bottom of the sleeve for connecting the over-striker cavity with an atmosphere through the cavity of the working cylinder. The non-return valve is being controlled by the stop, secured to the rod of the control cylinder. EFFECT: enhanced efficiency of installation due to simplified structure of the starting mechanism. 2 cl, 1 dwg
Patent RU-2011144-C1 (RU)
Title: Linear cutting cumulative device
Inventor: ELKIN VLADIMIR I
IPC: F42B1/02
Filed: 1990-05-21
Granted: 1994-04-15
Abstract: FIELD: metal cutting. SUBSTANCE: device has a body with side walls made with end projections. A charge in the form of an explosive rod with a cumulative lined hollow is positioned in the body. The projections are of a particular width and total length. The lining has a particular wall thickness. The body is made from a magnetoplastic or magnetoelastic material based on magnetosolid compositions. EFFECT: improved structure. 2 cl, 1 dwg
Patent RU-2039228-C1 (RU)
Title: Apparatus for gas and sand separation during oil extraction
Inventor: VLASOV VIKTOR ARAMOVICH
IPC: E21B43/28
Filed: 1990-09-04
Granted: 1995-07-09
Abstract: FIELD: oil extracting industry. SUBSTANCE: apparatus has additional hollow plunger with seat and reverse valve. Reducer has radial hole and reverse valve is located in radial hole of reducer. In the case, hollow plunger with seat form with reducer cavity, hydraulically connected with cavity of filter and through reverse valve with cavity of borehole. In process of sucker rod pump operation forced reciprocal motion of spiral spring coils from filter takes place, opening filtering slot with washing mechanical particles out of inner cavity of filter. EFFECT: apparatus for gas and sand separation during oil extraction is used in oil extracting industry. 3 dwg
Patent RU-2005326-C1 (RU)
Inventor: ZUBAREV SERGEJ A
IPC: H02J9/06
Filed: 1990-12-04
Granted: 1993-12-30
Abstract: Использование: расширение функциональных возможностей блоков питани  Сущность изобретени :  в универсальный блок питани  содержащий  выпр митель-преобразователь переменного напр жени  в посто нное с входом дл  подключени   нагрузки введены: батаре  гальванических элементов , блок зар дки гальванических батарей, усилитель  напр жени , осветительный прибор, вольтметр,  переключатели вспышка-вольтметр, зар дка-питание , сеть-батаре , фонарь-пробник и ступенчатый  переключатель величины напр жени . 1 иа
Patent RU-2050398-C1 (RU)
Inventor: DANYUSHINA GALINA A
IPC: C08J7/06
Filed: 1990-12-10
Granted: 1995-12-20
Abstract: Использование: для травления поверхности резины перед металлизацией, в машиностроении. Сущность изобретения: приготавливают состав для травления резины. Смешивают 50 55 мас. 4-амино-2,2,6,6-тетраметилпиперидина и 45 50 мас. бутилового спирта. Обрабатывают составом поверхность резины в течение 5 10 мин при 25 30°С. Промывают водой, сенсибилизируют, активируют. Подвергают химическому меднению 10 15 мин при комнатной температуре. Характеристика обработанной поверхности резины марки 7В-14 и покрытия следующая: краевой угол смачивания 0,62 0,86; шероховатость 0,7 1,9 мкм; прочность сцепления 22-30 кгс/см 2  1 табл.
Patent RU-2021271-C1 (RU)
Title: Method of synthesis of 4-[5,6,7,8-tetrahydroimidazo(1,5-a)-pyridine-5-yl]-benzonitrile hydrochloride
Inventor: IBRAKHIM YUTTA
IPC: A61P35/00
Filed: 1991-01-11
Granted: 1994-10-15
Abstract: FIELD: organic chemistry. SUBSTANCE: product: crystalline semihydrate of 4-( 5,6,7,8 -tetrahydroimidazo -[1,5-a]- pyridine -5- yl)- benzonitrile hydrochloride of the general formula. This compound shows a definite interplanar lattice distance (d) and relative line intensity of powder roentgenogram obtained in Guignet's chamber at copper irradiation K α1 , and high stability under condition of relative humidity. Reagent 1: 4-( 5,6,7,8- tetrahydroimidazo- [1,5-a] - pyridine -5- yl)- benzonitrile. Reagent 2: hydrogen chloride. Reaction condition: in the presence of water. EFFECT: improved method of synthesis. 2 tbl
Patent RU-2025996-C1 (RU)
Title: Installation for treatment biostimulators into feed
Inventor: TUMCHENOK VIKTOR I
IPC: A23N17/00
Filed: 1990-12-10
Granted: 1995-01-09
Abstract: FIELD: agriculture. SUBSTANCE: tubes 6 are disposed radially in reservoir 3 onto bottom. Holes 7 are disposed asymmetrical relatively the longitudinal axis of the tubes. Channel for gas removal is made in form of annular collector 9 mounted onto top edge of reservoir 3. There are branch pipes 10 onto internal side of ring 9; the branch pipes are mounted tangentially. The branch pipes are directed in opposition to holes 7 in tubes 6. Carbon dioxide circulation system is closed by fan 11 that results to reduction in discharge. EFFECT: reduced expenses for feed production. 3 dwg
Patent RU-2076531-C1 (RU)
Title: Состав для гидрофобизации кож
IPC: C14C9/00
Filed: 1990-12-28
Granted: 1997-03-27
Abstract: Состав для гидрофобизации кож, включающий полиорганогидросилоксановую жидкость, полиметилсилоксановую жидкость, сшивающий агент и растворитель, отличающийся тем, что, с целью повышения водостойких свойств кожи, сохраняемых при динамических нагрузках, состав в качестве сшивающего агента содержит фосфорорганические соединения следующих формул:при следующем соотношении компонентов, мас.%:Полиорганогидросилоксановая жидкость - 8 - 14,5Полиметилсилоксановая жидкость - 7 - 15Фосфорорганическое соединение - 0,5 - 5Растворитель - Остальноеи
Patent RU-2006916-C1 (RU)
Inventor: PETROV ALEKSANDR V
IPC: G06F7/556
Filed: 1991-04-02
Granted: 1994-01-30
Abstract: FIELD: computer engineering. SUBSTANCE: device has argument code input 1, high bit determination unit 2, encoder 3, shift unit 4, adder 5, multipliers 7-10, subtracters 11, 12, accumulating adder 13, code inputs 14, 15, 16, 17 device synchronization input 18. Outputs of encoder 3 and adder 4 are device outputs 6. Precision of computing of logarithm to base 2 is increased by use of fractional rational expression approximating logarithm mantissa and iterating computation of this expression. Four multipliers, two subtracters, accumulating adder and new functional connections are introduced to accomplish the goal of invention. Proposed invention is determined by the following features. Algorithm of operations is determined by solving of iterating equation in contrast to calculation of logarithm table proportional parts. Logarithm mantissa is determined by fractional rational approximation over full range of mantissa variation and not by linear functions each of which correspond to its own range. EFFECT: increased precision. 4 dwg
Patent RU-2058636-C1 (RU)
Inventor: GROMYKO VALERIJ N
IPC: H01Q19/06
Filed: 1991-05-12
Granted: 1996-04-20
Abstract: FIELD: antenna engineering. SUBSTANCE: assembly has scanning unit, antenna feed, reflector, and counter-reflector. Scanning unit is made in the form of first and second rectangular waveguide sections. First section is rigidly fixed and its end expands to form pyramidal horn. One end of second section of rectangular waveguide has its wide and narrow walls beveled to cone on outside and its other end is connected to horn-type feed. Waveguide with beveled walls is inserted in pyramidal horn in a spaced relation. Center of suspension of scanning unit is aligned with that of end section of second section with beveled walls. First rectangular waveguide section and feed are rigidly fixed to reflector and counter-reflector. EFFECT: more smooth scanning of space. 2 cl, 1 dwg
Patent RU-2050215-C1 (RU)
Inventor: NEVAR VYACHESLAV NIKOLAEVICH
IPC: B21D26/06
Filed: 1991-04-01
Granted: 1995-12-20
Abstract: Использование: штамповка деталей из листового материала эластичной, гидравлической и гидроэластичной средами. Сущность изобретения: на крышке аккумулятора сжатого газа импульсной машины смонтирован рабочий цилиндр с пустотелым поршнем-клапаном. Последовательно с рабочим цилиндром и соосно ему установлен управляющий цилиндр с поршнем и штоком, на конце которого имеется упор, взаимодействующий с поршнем-клапаном. Между нижним торцом рабочего цилиндра и стволом машины расположена кольцевая полость, связанная с аккумулятором и надбойковой полостью ствола. Последняя сообщена с атмосферой посредством ряда вертикальных каналов в боковой стенке поршня-клапана и горизонтальных отверстий в стенке рабочего цилиндра. 1 ил.
Patent RU-2000565-C1 (RU)
Inventor: MIKHALKIN ANATOLIJ P
IPC: G01N31/00
Filed: 1991-06-11
Granted: 1993-09-07
Abstract: Изобретение относитс  к области аналитической  химии. Сущность изобретени   состоит в последовательной обработке анализируемой  пробы ацетоном, этилировани-  ем диазоэтаном и хроматографированием  продукта реакции. 1 табл.
Patent RU-2013565-C1 (RU)
Inventor: ASTAPOV VLADISLAV N
IPC: E21F17/00
Filed: 1991-06-17
Granted: 1994-05-30
Abstract: FIELD: gas industry. SUBSTANCE: device has thermocatalytic bridge sensor 6, amplifier is connected across a diagonally opposite pair of bridge sensor junctions. Amplifier output is connected to rectifier bridge which output is connected to analog methane concentration indicating instrument via resistor 9, voltage-to-frequency convertor, diagnosis control unit, methane ultimate concentration comparator, audible signalling unit, unit 1 computing gas momentary concentration, gas integral concentration and gas concentration indication correction value. Device also has fixed storage 2, nonvolatile storage 3, digital display unit 4, serial interface modulator 5, frequency detector data digital processing unit 9, input circuit opto isolating unit 7. Inputs of unit 7 are connected to outputs of frequency detectors , outputs of unit 7 are connected to input of unit 9 via multiplexer 8. Control inputs of unit 9 are connected to outputs of port P1 of unit 1. Device also has frequency oscillator 10 with programmable frequency divider which control inputs are connected to outputs of ports P1 and P2 of unit 1. Output of oscillator 10 is connected to input of output circuit opto isolating unit 12 via demultiplexer 11. Outputs of unit 12 are connected to frequency filters 13.1-13.8 which outputs are connected to detector inputs via power network. Besides device has power unit 14 which first a. c. voltage output is connected to choke filters. Choke filters outputs are connected to detectors inputs. Device also has executive unit 15 and audible signalling unit 16 which outputs are connected to outputs of port P2. EFFECT: higher reliability. 4 cl, 10 dwg
Patent RU-2010506-C1 (RU)
Title: Device for watering and feeding of weaned piglets
Inventor: GAMALITSKIJ VLADIMIR A
IPC: A01K5/02
Filed: 1991-06-25
Granted: 1994-04-15
Abstract: FIELD: agricultural engineering. SUBSTANCE: device comprises pipeline connected to bowls with pipe unions, vacuum and float regulators of liquid level in bowls, connected by a pipeline via a common container, an air bypass pipe of vacuum regulator, adjustable for height. Each bowl union has an inside diameter of 8-10 mm and protrudes above bottom for 15-20 mm so as to maintain a liquid level in bowls at 5-70 mm by means of float or vacuum regulators. Bowls are installed on decks lifted 200-220 mm above the floor. EFFECT: improved design. 1 dwg
Patent RU-2044907-C1 (RU)
Title: Method of operating high-temperature gas-turbine plant
Inventor: PLOTNIKOV VASILIJ A
IPC: F02C9/18
Filed: 1991-05-05
Granted: 1995-09-27
Abstract: FIELD: power engineering. SUBSTANCE: gas is expanded in the nozzle set and working wheel of the turbine down to the presser lower than the atmospheric pressure. The gas is compressed in the compressor. A portion of the compressed air is withdrawn and supplied in the nozzle set of the turbine. EFFECT: enhanced efficiency. 2 cl, 4 dwg, 3 tbl
Patent RU-2011831-C1 (RU)
Title: Tunnelling unit
Inventor: BYKOV STANISLAV V
IPC: E21D9/04
Filed: 1991-06-26
Granted: 1994-04-30
Abstract: FIELD: underground construction. SUBSTANCE: tunnelling unit includes erector arm tunnel driver with mechanism for installing of lining blocks, tunnelling machines, scraper and frame with supports, recesses, and bracing mechanism with hydraulic jacks and support units. The latter are located in frame recesses and connected with frame by means of upper and lower jacks. Each support unit includes roofing with rear canopy, hydraulic prop and base. Support unit jacks may successively advance towards face as working arch becomes exposed and move frame together with tunnelling machines towards new face. EFFECT: higher efficiency. 6 dwg
Patent RU-2042400-C1 (RU)
Title: Method of gas cleaning of carbon dioxide
Inventor: BELOPUKHOV SERGEJ L
IPC: B01D53/02
Filed: 1991-06-27
Granted: 1995-08-27
Abstract: FIELD: gas industry. SUBSTANCE: gas containing carbon dioxide comes in contact with product of kaolin modification by ferric oxide monohydrate (III) in modification γ = FeO(OH) or δ = FeO(OH) at its content in product within 50 to 60 mass percent, having a density 3,8-5,0 g/cm 3 . EFFECT: facilitated procedure. 1 tbl
Patent RU-2026593-C1 (RU)
Title: Magnetic wedge-cooler
Inventor: MAKSIMOV VITALIJ S
IPC: H02K3/493
Filed: 1991-08-07
Granted: 1995-01-09
Abstract: FIELD: electrical engineering. SUBSTANCE: magnetic wedge-cooler includes magnetic core 2 assembled from laminations 3 insulated from each other and from crowns of teeth with the use of dielectric. Teeth are clamped together axially by means of tubular elements 6 with threaded ends 7 and 8. Nuts 11 and 12 are put on the latter. EFFECT: expanded application field. 4 cl, 2 dwg
Patent RU-2046317-C1 (RU)
Title: Radiation detector for infrared gas analyzer
Inventor: BOGDANOVA NADYALKA KOSTADINOVA
IPC: G01N21/35
Filed: 1991-07-01
Granted: 1995-10-20
Abstract: FIELD: measurement technology. SUBSTANCE: device has casing 1 made from silicon or other material having temperature coefficient of linear expansion close to that of silicon, and enclosing two symmetric spaces 2 separated from each other and hermetically sealed by means of silicon membrane 5 and filled with standard gas. Two sensitive members 6 are placed on both sides of the membrane, the members being filamentary monocrystals which current output terminals are connected to leak-proof lead- ins 7. Windows 3 transparent for infrared light and openings in the form of capillary tubes 4 are symmetrically spaced in the casing. EFFECT: enhanced accuracy of measurements. 1 dwg
Patent RU-2048174-C1 (RU)
Inventor: ESENBERLIN RAVNAK E
IPC: F01N3/08
Filed: 1991-10-10
Granted: 1995-11-20
Abstract: FIELD: cleaning of exhaust gases. SUBSTANCE: exhaust gases are cleaned by catalyst reburning. The second component of reburning mixture is iron chips. Mass relation of components is 9:1. Device for gas cleaning has reactor with catalyst in form of a mixture. Reactor is provided with unit for feeding gases to be cleaned and unit for feeding fuel. The first unit is provided with ejector preferably. The second ejector is connected with air intake and mounted at point of exit of gases from the reactor. The other variant of the device for gas cleaning has unit for supplying gases, reactor with catalyst, input ejector, and reactor for supplying air. Catalyst is disposed in form of several sections at several levels. Reactor has water jacket for cooling. The second ejector, connected with turbo-compressor, is mounted at the output of reactor. Steam boiler, heat exchanger, and turbo-pump are mounted at output of the reactor preferably in series. There is unit for catching SO 2  in form of shower chambers; the unit is mounted behind the turbo-pump. Cooling tower with coil is mounted behind the units. EFFECT: improved quality of cleaning. 3 cl, 7 cl, 3 dwg
Patent RU-2014227-C1 (RU)
Title: Building material gravitational mixer
Inventor: FAKTUROVICH DMITRIJ A
IPC: B28C5/08
Filed: 1991-10-04
Granted: 1994-06-15
Abstract: FIELD: mechanical engineering. SUBSTANCE: mixer has a drum with a tyre and blades on inner and outer surfaces. A two-link joint is crosswise mounted on the drum bottom, one link is connected to an axle, the joint has a lock. The joint may be made from two semiaxles with slots for pins, the semiaxles are connected by a nut with right and left thread. EFFECT: improved structure. 2 cl, 4 dwg
Patent RU-2014040-C1 (RU)
Title: Method for estimation of artificial negative lens power
Inventor: SHPAK ALEKSANDR A
IPC: A61F2/16
Filed: 1991-12-18
Granted: 1994-06-15
Abstract: FIELD: medicine. SUBSTANCE: method includes keratometric measurements, eye length determination and angle measurement of pattern stimulator element that provides the peak amplitude in evoked brain potential. Based on the data obtained, lenticular negative lens power is estimated according to the formula given in the description of the invention. EFFECT: increased accuracy. 2 dwg
Patent RU-2052754-C1 (RU)
Inventor: KAPISHNIKOV ALEKSANDR P
IPC: F27D17/00
Filed: 1991-12-10
Granted: 1996-01-20
Abstract: FIELD: heat power engineering. SUBSTANCE: system is additionally furnished with condensation and convection stages of gas condensation economizer connected through pipings to the feed of mix of raw materials. The economizer is installed before the chimney and connected to cyclone heat exchangers and rotating furnace through a gas conduit. EFFECT: enhanced efficiency. 1 dwg
Patent RU-2000341-C1 (RU)
Inventor: NASTICH VLADIMIR P
IPC: C21D8/12
Filed: 1992-02-07
Granted: 1993-09-07
Abstract: Сущность изобретени : способ производства  изотропной электротехнической  стали включает гор чую прокатку, нормализацию , холодную прокатку на конечную тол-  щину, обезуглероживающий и  заключительный отжиги. При этом температуру  заключительного отжига устанавливают  в зависимости от температуры  нормализации tH.o и плавочного содержани   Mn, AI согласно уравнению 1з.0(&deg;С)  1385&deg;С-  - 0,31  тн.о (&deg;С) - Ci  Mn, вес% - С2  AI,  вес% ± 7&deg;С, где Ci  130&deg;С/% - размерный  коэффициент; С2  72&deg;С/% - размерный коэффициент . 2 табл. ю о 8 СО
Patent RU-2034565-C1 (RU)
Title: Biologically active preparation for hens and method of its production
Inventor: LAZAREV ALEKSEJ P
IPC: A61K35/14
Filed: 1992-02-13
Granted: 1995-05-10
Abstract: FIELD: veterinary. SUBSTANCE: proposed preparation contains (mass %): protein 10-60, amino acids 1.9-5, fatty acids 0.1-15.5, sugars 2.5-30, ascorbic acid 0.9-10, water 1.5, mineral salts the rest. Said preparation is produced by cultivating virus- and/or non-virus induced lymphoid cells of hens followed by filtration. One portion of filtrate is lyophilized, dissolved in buffer solution and then is added at ratio 1:10 into aerosol solution. Then fatty acids (10-1000 micrograms) and sugars (5-20 micrograms) are added and mixing with acetone solution is carried out. Thus prepared precipitate is dissolved in salt physiologic solution, mixed with other portion of filtrate and lyophilized. Preparation having activity 10000 units is used 2-3 times as prophylactic agent intranasally, perorally or parenterally at dose 0.2-1 ml. Preparation having activity 1 mln of units is used 3-4 times for treatment, its dose being 0.2-1 ml. EFFECT: improves quality of preparation. 6 cl, 1 tbl
Patent RU-2109651-C1 (RU)
Inventor: EVLANOV V I
IPC: B62D17/00
Filed: 1992-02-12
Granted: 1998-04-27
Abstract: FIELD: transport engineering. SUBSTANCE: device to adjust front wheel angles of vehicle, (camber and caster) has means for movable connection with vehicle body and with suspension lever by means of articulated joint including spherical head ball pin with threaded shank and intermediate conical rod installed in hole of hub to form adjustment unit and arranged with eccentricity relative to outer round surface of hub and its support surface for turning around axle. Adjustment unit is made in form of conical surfaces on hub and on support plate arranged in corresponding hole of suspension lever with two conical surfaces, with vertices of cones being pointed to each other and providing slackless connection and self- alignment of parts of the unit. Moreover, support plate of adjustment unit attachment can rest either on conical surface of straight or rounded off profile in axial section of cone or on flat surface of suspension lever. EFFECT: enlarged operating capabilities. 2 cl, 4 dwg
Patent RU-2005987-C1 (RU)
Inventor: KOMAROV VALERIJ I
IPC: F42C19/08
Filed: 1991-08-20
Granted: 1994-01-15
Abstract: FIELD: detonating devices. SUBSTANCE: detonating device accommodates in its body source of initiating impulse, primary and secondary explosive charges. Primary charge is mixture of initial components of reaction for production of azide and styphnate of lead, or silver or cadmium, with one mixture component being crystal hydrate. Mass of primary charge M≥ 0,317d 3 S a , where d is diameter of charge compression; S a  is average density of mixture component monocrystals, and mass of mixture components in primary charge is proportional to stoichiometric relation of reaction of synthesis of produced from them initiating explosives. EFFECT: higher efficiency. 1 dwg
Patent RU-2032686-C1 (RU)
Title: 2-trifluormethyl-3-heptafluorisopropyl-4,4- bistrifluormethylineindolizine-2 having growth stimulating activity for phytopathogenic fungus and for egrotamine strain of smut
Inventor: KADYROV ALEKSANDR A
IPC: A01N33/04
Filed: 1992-03-02
Granted: 1995-04-10
Abstract: FIELD: organic chemistry. SUBSTANCE: desired product having essential formula C 14 H 9 F 16 N is prepared by interaction of perfluor-3-isopropyl-4-methyl-pentene-2 with piperidine. Said reaction is carried out in medium of absolute alcohol. Boiling point of desired product is 107 C/2 mm, its yield being 72%. EFFECT: improves activity of the product. 2 tbl
Patent RU-2039749-C1 (RU)
Title: Method of synthesis of 1-alkenyl-1- (isobutyl)-1-chloroalkanes
Inventor: DZHEMILEV USEJN M
IPC: C07F5/06
Filed: 1992-03-12
Granted: 1995-07-20
Abstract: FIELD: organic chemistry. SUBSTANCE: product: compounds of the formula (I) 1-C-H-Al(Cl)-CR= CHR where R phenyl, propyl, butyl. Reagent 1: di-R-substituted acetylene. Reagent 2: di(isobutyl)aluminium chloride. Reaction condition: in the presence of catalyst - dicyclopentadienyl titanium chloride at its molar ratio to reagents 1 and 2 (0.3-0.5):10:(20-30), stirring at the room temperature for 16-20 h. The yield of the end product is 84-98% EFFECT: improved method of synthesis, increased yield of product. 1 tbl