baber/WOPTO huggingface dataset:
Patent KR-950001198-B1 (KR)
Title: Paper and film auto-setting method in cvp
Inventor: LEE KWANG-YUN
IPC: B41J2/315
Filed: 1991-10-08
Granted: 1995-02-14
Abstract: The method automatically sets the sensitized paper and film on the video printer, and specially reduces the delay time at a printing command by finishing the print preparation when the power gets switched on. The method comprises a step of determining if the sensitized paper incomes in the printer when the power gets switched on; a step of determinig if the film is at a right position when the sensitized paper incomes in the printer.
Patent KR-920002237-B1 (KR)
Inventor: KOHODA KAZUAKI
IPC: C08L67/00
Filed: 1991-11-14
Granted: 1992-03-20
Abstract: 내용 없음.
Patent KR-100211850-B1 (KR)
Inventor: SCHOLL HANS-JOACHIM
IPC: C07C263/18
Filed: 1992-04-03
Granted: 1999-08-02
Abstract: 본 발명은, 
     a) 유기 이소시아네이트와 일반식(I)의 실릴화 산 0.001 내지 1몰%(이소시아네이트 기준)를 20내지 150℃에서 혼합하고, 
     b) 임의로, 5분 이상 정체시킨 후, 수득된 혼합물을 증류에 의해 후처리함으로써 유기 이소시아네이트를 컨디셔닝 하고 / 하거나 정제하는 방법에 관한 것이다. 
     
       
     
     상기식에서, 
     X는 pKa치가 3이하인 n - 염기성 산으로부터 산성 수소 원자를 제거하여 수득된 중성 산(단, 하이드로할산 제외)잔기이고, 
     n은 1내지 3의 정수이다.
Patent KR-100264094-B1 (KR)
Title: Signal processing system and apparatus using this system
Inventor: HARM JAN WELMER
IPC: H04N21/442
Filed: 1992-05-02
Granted: 2000-08-16
Abstract: A system of domestic video apparatuses (10,12,14 etc.) are interconnected by video cables (64,66,68) and also by a serial data bus (D2B,16) having distributed control intelligence (20,22). Within each apparatus, signal generator and/or detector functions are defined, which can be activated and controlled via the bus (16) to identify automatically video cable connections (64,66,68) between various plugs (26-1,2,3, 52-1,2,3, etc.) of the apparatuses (10,12,14). The functions can be implemented without additional conductors for cable detection signals, and with little or no additional hardware cost. <IMAGE>
Patent KR-950014882-B1 (KR)
Title: Movie camera
Inventor: CHOI CHUL-SU
IPC: H04N5/222
Filed: 1992-09-23
Granted: 1995-12-16
Abstract: The camera for taking picture with free angle regardless of camera position, includes: an upper body(1) holding a main body(2) and tilting an angle adjuster(15) with a geared motor(11); a lower body(10) having a rotator(20) with a geared motor(13); a controller(25) controlling a moving plate(16) with a motor(28); and the adjuster(15) varying height of folding legs(31) with a driver(32).
Patent KR-960003004-B1 (KR)
Title: Method of making a capacitor to semiconductor memory cell
Inventor: CHON YOUNG-KWON
IPC: H01L27/04
Filed: 1992-10-07
Granted: 1996-03-02
Abstract: A capacitor is produced in a semi-conductor storage component in stages. A storage cell transistor is first made on a semi-conductor substrate, a layer of insulation is removed, and a number of double layers are produced from removable layers of two materials; a hole for contact is made by etching through both those layers and the insulation; one conducting layer and one last removable layer of the second material are separated in the correct sequence; the structure at the nodal area of the storage electrode of a capacitor is prepared by etching the double layers, the first conducting layer and the last removable layer. The removable layers are next taken from the first material by wet etching; a second conducting layer is removed, the second conducting layer is etched anisotropically and the nodal area is formed; a storage electrode node is produced by wet etching all removable layers of the second material; a layer of dielectric is formed on the node, and a plate electrode is produced on the dielectric. The first material concerned is preferably silicon nitride and the second polyimide; the conducting layers are preferably polycrystalline silicon and the dielectric layer a silicon nitride-silicon oxide double layer. The method is simple and saves time.
Patent KR-960004678-B1 (KR)
Title: Polypropylene resin composition for extrudable molding
Inventor: LIM KI-CHOL
IPC: C08L23/12
Filed: 1992-11-03
Granted: 1996-04-11
Abstract: The polypropylene resin compsn. comprises 60-85 wt.pts of polypropylene, 10-30 wt.pts of polyethylene and 2.5-7.5 wt.pts of ethylene-propylene copolymer rubber, where the total amt. of the polyethylene and the ethylene-propylene copolymer rubber is less than 35 wt.%. The ratio of melt index of polyethylene and polypropylene is 0.1-70. The melt index of polypropylene is 0.1-1.0 and its specific gravity is 0.900-0.920. The melt index of polyethylene is 0.05-30 and its specific gravity is 0.940-0.970. The ethylene-propylene copolymer rubber comprises 60-80 wt.pts of ethylene and 20-40 wt.pts of propylene. The obtd. polypropylene resin compsn. has flexibility and improved impact resistance, then is useful for molding a heat water pipe.
Patent KR-960016376-B1 (KR)
Title: Battery's charging and discharging circuit
Inventor: CHOE SANG-HO
IPC: H02J7/00
Filed: 1992-12-23
Granted: 1996-12-09
Abstract: a battery(26); a charge voltage-generating part(24) supplying the battery with a charge voltage by receiving the power source voltage; an over-discharge detecting part(28) outputting an over-discharge signal by detecting the voltage level of the battery(26); and a charge/discharge control circuit(32) controlling the charge/discharge operation of the battery(26) by being controlled by the over-discharge signal.
Patent KR-960011836-B1 (KR)
Title: Unorganic powder paint compositions for electrostatic spray coating
Inventor: KANG BYUNG-DO
IPC: C09D5/03
Filed: 1992-12-29
Granted: 1996-09-03
Abstract: The composition comprises 90-97.7 wt.% boron silicate frit, 0.1-3.0 wt.% organo-silane compounds, 0.1-0.2 wt.% electrostatic efficiency promoter, 0.1-0.5 wt.% inorganic acid, and 2-5 wt.% amorphous silica compounds. An enamel coating layer having an excellent acid resistance is formed onto the powder paint. The efficiency of electrostatic spray coating is increased to 70% by applying instant voltage of 50-100kw.
Patent KR-950013839-B1 (KR)
Title: Code transformation circuit to measure ber of serial communication system using taxi chip set
Inventor: CHAE JONG-OK
IPC: H04L12/26
Filed: 1992-12-29
Granted: 1995-11-16
Abstract: a bit error ratio measurement transmitting part; a code conversion circuit transmitting part for converting an imaginary random data and clock signal into parallel data coded as 4B/5B by being connected to the bit error ratio measurement transmitting part, the imaginary random data and clock signal being outputted from the bit error ratio measurement transmitting part; a TAXI receiving chip of a measured system for receiving a serial data from an internal code conversion circuit transmitting part of the code conversion circuit; a code conversion circuit receiving part for converting the 4B/5B coded data into the right previous data by being connected to the internal code conversion circuit transmitting part of the code conversion circuit; and a bit error ratio measurement receiving part for measuring the bit error ratio by comparing it with the imaginary random bit ratio transmitted from the bit error ratio measurement transmitting part, the bit error ratio measurement receiving part being connected to the code conversion circuit receiving part.
Patent KR-960013579-B1 (KR)
Title: Wet-tip die for efg crystal growth apparatus
Inventor: HARVEY DAVID S
IPC: H01L21/208
Filed: 1991-05-20
Granted: 1996-10-09
Abstract: A novel capillary die and crystal growing method are provided for growing a hollow crystalline body by EFG. Inner and outer annular moats surround the die tip. Passageways are provided for supplying melt to those moats from a crucible, so that melt in said moats will wet and cover the inner and outer exterior surfaces of the die tip during growth of a hollow crystalline body. The novel die may be constructed so as to have a lower die tip and a shorter capillary than EFG dies heretofore used to successfully grow hollow bodies. The die design facilitates keeping the temperature of the die tip substantially uniform about its circumference, thereby improving the uniformity of thickness of the wall of the crystalline body grown from a film of melt on the die tip. The moats reduce the likelihood of the growth process being interrupted or adversely affected by flooding of the die. In the event the growth meniscus breaks, liquid silicon is captured in the moats, thereby preventing or reducing the likelihood of flooding of the die and associated growth apparatus.
Patent KR-960014331-B1 (KR)
Title: Sterile or specific pathogen free environment products
Inventor: WILSON MICHAEL
IPC: C12M/
Filed: 1991-03-26
Granted: 1996-10-15
Abstract: Methods of maintaining or providing sterile or specific pathogen free environments are disclosed. The methods involve the use of semi-permeable membrane materials between the sterile or pathogen free environment and surrounding potentially hostile environments. One particular method and apparatus is described for introducing drugs or other secondary substances to a sterile liquid for example for transfusion to a patient. The apparatus has a first port (4) for connection to a container of sterile solution second port (5) for connection to a transfer tuber and a third port (9) for introduction of the secondary substance. The connection between the third port and the other ports is by way of a semi-permeable membrane (11) selected to permit the passage of the secondary substance while preventing the ingress of pathogens or other potentially harmful organisms. <IMAGE>
Patent KR-950010185-B1 (KR)
Title: Making method for bongsam drink
Inventor: CHONG JIN-SHIK
IPC: A23L2/38
Filed: 1993-01-08
Granted: 1995-09-11
Abstract: The ginseng  bongsam drink  is prepd.  by 1)  mixing Bongsam, ginseng licorice root and bean (mixing  ratio is 1:10:10), 2) adding 8-15  times water to the mixt., boiling at 100-120  deg. C for 2-4 hrs., and filtering to  obtain the supernatant,  3) mixing  the obtd.  soln. with  organic acid  and vitamin, and 4)  adding CO2 gas into  the soln. at 4-5  deg. C and 0.4-1.8g/Cm2 to obtain the final product.
Patent KR-970002680-B1 (KR)
Inventor: ONO KATSUHIRO
IPC: H01J35/10
Filed: 1993-04-08
Granted: 1997-03-08
Abstract: 내용없음
Patent KR-950012961-B1 (KR)
Title: Deaeration method use cyclon separated device for coffee solution
Inventor: KYE HUN-U
IPC: A23F5/00
Filed: 1993-05-04
Granted: 1995-10-24
Abstract: The coffee concentrate containing 35-60% water-soluble solid(density is 0.4-0.99g/cc) is deaerated by batch- or continous-centrifuging at 1000 rpm or more and 1,000-13,000 relative centrifugal force for 2min. or more. The density of the coffee concentrate is high and can be preserved without lors of flavour.
Patent KR-0158221-B1 (KR)
Inventor: KIM SUK-HO
IPC: B60C9/02
Filed: 1993-05-12
Granted: 1998-12-01
Abstract: 본 발명은 타이어의 카카스 코드를 보강한 공기입 타이어에 관한 것으로서, 폴리에스터 칩을 판상 형태로 압출하여 그 표면에 구멍을 형성하고 접착제를 도포한 후 열처리한 것을 카카스 코드로 사용하는 것을 특징으로 하는 것이다.
Patent KR-100286116-B1 (KR)
Title: 3-(carboxymethoxyphenyl)benzofuran-2-one stabilizer
Inventor: NESVADBA PETER
IPC: C09K15/04
Filed: 1993-05-14
Granted: 2001-04-16
Abstract: PURPOSE: A stabilizer composition comprising 3-(carboxymethoxyphenyl)benzofuran-2-one is provided to be usable for stabilization of organic materials against oxidative, thermal or light-induced degradation. CONSTITUTION: The stabilizer composition comprises (a) an organic material subject to oxidative, thermal or light-induced degradation; and (b) at least one compound of 3-(carboxymethoxyphenyl)benzofuran-2-one. The compound 3-(carboxymethoxyphenyl)benzofuran-2-one is represented by the formula 1, wherein R2, R3, R4 and R5 are hydrogen, unsubstituted or substituted alkyl, phenylalkyl, phenyl, cycloalkyl, alkoxy, hydroxy, alkanoyloxy, alkenoyloxy, cycloalkylcarbonyloxy, or benzoyloxy, or together with the carbon atoms, form a phenyl ring; and R7, R8, R9 and R10 are hydrogen, alkyl or alkoxy; R11 and R12 are hydrogen, alkyl or phenyl; in the case where R3, R5, R6, R7 and R10 are hydrogen, R4 is additionally a radical of the formula 2 (in which, R2, R8, R9, R11 and R12 are as defined above, and R17 and R18 are hydrogen, alkyl or phenyl, or together with the carbon atoms, form unsubstituted or substituted cycloakylidene ring); R6 is hydrogen or a radical of the formula 3 (in which, all the radical are as defined above); m is an integer of 1 to 6; and R1 is selected from hydroxy, unsubstituted or substituted aliphatic and aromatic group depending on m.
Patent KR-960011043-B1 (KR)
Title: Manufacturing method of porous separation membrane
Inventor: KIM JAE-HYUP
IPC: B01D69/00
Filed: 1993-05-19
Granted: 1996-08-16
Abstract: The membrane is made of polymer such as cellulose acetate, polyacrylonitryl, polyvinylchloride, polyamide, polycarbonate, polysulfone, polyvinylyden fluoride or polyimide and 5-30 wt% nonionic surfactant such as octylphenoxypolyethoxy ethanol or 5-30 wt% mixture of nonionic surfactant and water at the ratio of 20:1-5:1. The polymer solution is maintained at 15-90 deg.C.
Patent KR-970009115-B1 (KR)
Title: Ink-jet print head
Inventor: CHO HEE-KEUN
IPC: B41J2/15
Filed: 1993-05-31
Granted: 1997-06-05
Abstract: The ink-jet printer head includes upper and lower boards separated from each other at a predetermined distance, a nozzle provided at the one end of the upper and lower boards for discharging ink drops, a pressure channel connected to the nozzle for transmitting a pressure wave to the nozzle and supplying a liquid to the nozzle, a piezoelectric element provided in contact with the pressure channel and having upper and lower ends connected to the upper and lower boards, and a pair of electrodes for supplying the electric field to the piezoelectric element. The polar direction of the piezoelectric element is formed inclined at a predetermined angle with respect to the lengthwise direction of the piezoelectric element.
Patent KR-100263004-B1 (KR)
Inventor: ABEYOUKINO
IPC: G02F1/1337
Filed: 1993-06-08
Granted: 2000-08-01
Abstract: 본 발명은 유기물질로 이루어진 얇은 피름을 마찰 처리하는데 기인하여, 감소된 징상 및 우수한 액정 배열 특성을 갖는 액정 배열 필름 및 이의 액정 디스플레이 장치를 기술하고 있다. 구체적으로, 본 발명은 주성분으로서 주쇄내에 일반식(1)의 구조을 갖는 중합체를 함유하는 액정 배열 필름, 주성분으로서 일반식(2)의 구조 단위를 갖는 폴리이미드를 함유하는 액정 배열 필름 및 이들 배열 필름을 사용하여 제조한 액정 디스플레이 장치에 관한 것이다. 
     
       
     
     상기식에서, 
     X 및 Y는 동일하거나 상이하며, 각각 수소 원자, 탄소수 1 내지 3의 알킬 그룹, 불소 원자, 염소 원자 또는 트리플루오로메틸 그룹이고, 이때 이들 치환체의 위치는 o-위치 또는 m-위치일 수 있으며, R은 4가 방향족 그룹, 4가 지방족 그룹 또는 2가 방향족 특성과 지방족 특성을 모두 갖는 복합 그룹이다.
Patent KR-950012262-B1 (KR)
Title: Movable & foldable head-rest for car
Inventor: CHONG KI-YONG
IPC: B60N2/48
Filed: 1993-06-11
Granted: 1995-10-16
Abstract: The headrest which is movable in the back and forth direction and also foldable, is mounted on a pair of the guide rails(3, 3') attached to the head lining of the vehicle roof. The headrest is connected with a lower stationery bar(5') which is coupled with an upper stationery bar(5) by a fastening nut(8). A carriage(4) with the upper stationary bar is slidably mounted on the rail(3), having a lever(11) with a winding spring(10) and a connecting projection(12). The connecting projections are connected with holes(9)(9') formed at the lower side of the rail. The headrest may be folded at the position between the two stationery bars(5, 5') by a hinge shaft(6), a spring(7) and the fastening nut(8).
Patent KR-960006811-B1 (KR)
Title: Sheet arrangement device for stapling
Inventor: JUNG YEUN-KWAN
IPC: G03G15/00
Filed: 1993-06-28
Granted: 1996-05-23
Abstract: The device includes a plurality of trays where the sheets of copy paper from the main body are collected; a guide groove formed in the diagonal direction of a tray; a tray supporting plate which is installed under the tray, and has transferring means at its both ends; a rack with a specific length; a jogging frame; a power transmission means; a pinion; and an arrangement means.
Patent KR-960015307-B1 (KR)
Title: Joining method and apparatus for sash and decorative material
Inventor: KIM DONG-YOUNG
IPC: B29C65/52
Filed: 1993-07-15
Granted: 1996-11-07
Abstract: preheating a decorative belt coated with adhesives to attach the decorative belt to a sash; compressing the decorative belt to the outside of the sash with a number of compression rollers (22); and applying hot wind during the process of supplying and compressing the sash. The system comprises: a preheating chamber (2); an adhesives tub (6) installed in front of the preheating chamber (2); a floating roller (7); a conveyor (15); a number of compression rollers (22); and hot wind blowers (23,24). The system maximizes value of the product with diverse colors and patterns.
Patent KR-100289598-B1 (KR)
IPC: C08L27/04
Filed: 1993-08-18
Granted: 2001-05-02
Abstract: Acrylic impact modifiers for polar thermoplastics such as poly(methyl methacrylate), polyamides, and poly(vinyl chloride) are prepared from emulsion polymer particles with hard methacrylate-rich lightly crosslinked domains in a continuous predominantly polyacrylate network.
Patent KR-0122539-B1 (KR)
Inventor: SIMIS GASDOSI
IPC: B43L13/08
Filed: 1993-09-06
Granted: 1997-11-11
Abstract: [목적] 
     스케일의 중량을 가볍게 한다. 
     [구성] 
     합성수지 등의 압출에 의해서, 길이방향 전체길이에 중공부(8)가 형성된 스케일 본체(6)를 성형한다. 스케일 본체(6)의 길이방향의 양단의 개구부에는 뚜껑(28)이 탈착 자재로 끼워맞추고, 이 뚜껑(28)이 탈착 자재로 끼워 맞추고, 이 뚜껑(28)에 상기 중공부(8)내의 공기의 열팽창을 도피시키기 위한 공기빼기구멍(30)이 설치되어지고 있다.
Patent KR-970002306-B1 (KR)
Title: Forming method for polyester film
Inventor: SEO JUNG-WOOK
IPC: B29D7/01
Filed: 1993-09-28
Granted: 1997-02-27
Abstract: Method of manufacturing the bi-direction stretching polyester film consists of the stretching step and the crystallizing step while amorphous or vertical stretching sheets are heat treated into a tenter. The feature of this manufacturing method is that the heat treatment is accomplished by the infrared heater. Instead of the heating process by the air convection, if the radiation heating process is applied, the infrared heater directly heats a film, so that amorphous or vertical sheets could be equally heat treated.
Patent KR-960004431-B1 (KR)
Title: Al-scattering welding method
Inventor: LIM JUNG-KOO
IPC: B23K20/00
Filed: 1993-10-13
Granted: 1996-04-03
Abstract: The diffusion welding method reduces the welding cost of radiators by heating the radiating plates inserted with welding electrodes in a gas furnace. The diffusion welding method comprises: spraying the flux(3) on the radiator base(1) and placing radiating plates(2) on the base; inserting welding electrodes(6) between the radiating plates and preheating it at 550 deg.C for 3˜5 minutes; and rapid heating at 620˜630 deg.C in the second gas furnace(9).
Patent KR-0123084-B1 (KR)
Title: Moving picture decoding system having memory architecture for parallel process
Inventor: KWON OH-SANG
IPC: H04N19/436
Filed: 1993-10-28
Granted: 1997-11-17
Abstract: A dynamic image decoder having a memory structure for a parallel process capable of reading data of a boundary between divided modules necessary to estimate a movement is disclosed. In the decoder, an inverse differential pulse code modulators(515,535) inverse- differential-pulse-modulates input data in a unit of one module and motion estimating data. A memory section(52) has a plurality of memory modules(522,523) which each store  corresponding module among output data from inverse differential pulse code modulators(515,535). A plurality of read data bus control sections(524,525) control a read data bus to selectively read data stored in memory modules thereof, and data of other memory module. An address generator(521) controls a data bus control operation of read data bus control sections(524,525).
Patent KR-0118764-B1 (KR)
Title: Washing machine having drying means
IPC: D06F25/00
Filed: 1993-12-31
Granted: 1997-09-30
Abstract: A hot-air washer-dryer is provided. The washer-dryer has a washing tub inside the outside body(1), an water tank(2), a driving part(3), and a drying part(4). This machine also has a support part(7). anchoring the water tank, two hanger bars(1A) on each upper corner of the outside body to be located on each of the two opposite sides of the water tank, the supporting plates(51)(51A) vertically bent and set on the lower part of each hanging bar, to which the shaft-pin(21)(21A) of the water tank is inserted, and a fixing plate(1). A ring-shaped rotating part on the external surface of the water tank on the side of the fixing plate rotates the water tank by engaging its inside circumferential surface with the gear(61) of the motor(6) attached to the fixing plate.
Patent RO-120434-B1 (RO)
Title: Multifunctional signalling body
Inventor: KOTELES LORANT
IPC: G09F9/40
Filed: 2003-09-08
Abstract: The invention relates to a multifunctional signalling body destined to mark the presence and the condition of a usedmotor vehicle, for example the ones used as taxis. According to the invention, the body consists of a foot (1) and a translucent housing (2), on the housing (2) of the signaling body there being present some indentations (a) with increased transparence at the extremities of the housing, the body inner space being divided into three compartments (c, d and e) by some inner diaphragms (3 ad 4) having at the upper and lower sides some cutting-outs (h, i, f and g), in each compartment (c, d and e) there being an electric lamp (5, 6 and 7) that is lit up adequately to indicate the motor vehicle presence in the traffic, the busy or vacant condition thereof, the securing to the housing (2) being made through an assembly of magnetic parts with dovetail shape or by joining based on some profiles, on the longitudinal sides, completed with a screwed joint to the opposing side.
Patent RO-127082-B1 (RO)
Title: Process for preparing copper powder
Inventor: LUNGU DĂIAN-HORAŢIU
IPC: B22F9/08
Filed: 2010-02-17
Abstract: The invention relates to a process for preparing copper powders by atomizing molten metal with high-pressure water and to a copper powder which is used as a starting material for producing filters, sleeves, toothed wheels, bearings, sparking plugs, Cu-graphite composite materials or brake pads for motor vehicles, by sintering or sinter-moulding. The claimed process has the following stages : smelting a charge of copper wastes in an induction furnace, pouring the molten mass with a temperature of 1300°C in a pouring gate provided at its lower part with a nozzle with the diameter of 10 mm having the role of forming a vein of molten metal with the same diameter which flows in the atomizing tower wherein it is disintegrated by the high-pressure water jets of a multi-jet type atomizing system with 12 nozzles, circularly arranged, so that the axis of water jets forms angles of 11° with the vertical of the molten mass axis of flow, the water jet having a diameter of 1 mm and a pressure of 9 MPa, with a flow rate of the atomized water of Q= 0.1 m/min ensured by Woma-type pump, followed by drying the metal particles in an electric furnace at a temperature of 200°C and by granulometric sifting with the retention of particles < 425 μ m, followed by the thermochemical treatment of reduction in dissociated NHat a temperature T= 550°C and grinding the resulting copper sponge in a Chilean mill at a speed of 12 rpm. The claimed Cu powder has the following composition: 0.013...0.01% Si, 0.096...0.12% Fe, 0.025...0.06% Ni, 0.06...0.9% Sn, 0.023...0.3% Zn, 0.043...0.06% Pb, 0.24...0.25% O, 98.3...99.5% Cu, the grain shape is irregular, the granulometric fraction < 212 μ m =70%, the flow rate V=36s/100 g and the apparent density ρ= 4.15 g/cm.
Patent RO-127173-B1 (RO)
Title: Process for preparing absorbing hydrogels based on cellulose-lignine or cellulose-lignine-epoxy resin
Inventor: CIOLACU DIANA ELENA
IPC: C08J3/075
Filed: 2010-09-02
Abstract: The invention relates to a process for preparing absorbing hydrogels based on cellulose-lignin/lignin-epoxy resin by the cross-linking of a mixture of cellulose, dissolved at a temperature of -30°C in an 8.5% NaOH solution, lignin/lignin-epoxy resin and epychlorohydrine at 85°C, for 7 hours, after which the resulting hydrogel is washed to remove impurities and treated with acetone to remove the epychlorohydrine and is finally dried under vacuum.