baber/WOPTO huggingface dataset:
Patent KR-20020048158-A (KR)
Title: cleanning apparatus of beltconveyor using waste heat of a converter
Inventor: YOO CHEOL JONG
IPC: B65G39/073
Filed: 2000-12-16
Abstract: PURPOSE: A cleaner of a belt conveyer with waste heat of a converter is provided to prevent damage of a belt by removing foreign material attached to the belt. CONSTITUTION: A cleaner of a belt conveyer by waste heat of a converter comprises a belt(11) returning material to a hearth hopper; a pulley(10) mounted on a hopper; a cleaner(30) supported on a supporting plate(32) through a cylinder(31) by being mounted on a back filter body(20); a dust removing roll(40) removing dust by blasting wind toward the pulley; porous(41) formed on the dust removing roll; a rotational shaft pipe supplying air by being mounted in the dust removing roll; an air nozzle injecting the air into a hollow unit of the dust removing roll; an injecting roll(50) removing moisture contained in the belt; a dehumidifying roll(60) removing the moisture by contacting to the belt; and a nozzle injecting waste heat into the belt through the porous and rotational shaft pipe by being mounted on the hollow unit of the injecting roll.
Patent KR-20020051660-A (KR)
Title: structure of prove card for testing semiconductor device
Inventor: KANG BYEONG WON
IPC: H01L21/66
Filed: 2000-12-23
Abstract: PURPOSE: A probe card is provided to increase the number of tested semiconductor devices by improving a structure. CONSTITUTION: A probe card comprises holes(3) formed in center portions, a plurality of contact pads(5) connected to pogo pins, needles(4) fixed around the holes(3), and a PCB(Printed Circuit Board)(2) connected with the contact pads(5). At this point, the needles(4) are respectively connected with the contact pads(5). Because of forming a pair of holes(3), the needles(4) formed around the holes(3) have a double number, so that the contact pads(5) respectively connected with the needles(4) are double, thereby increasing the number of tested semiconductor devices when performing an electrical test of a wafer.
Patent KR-20010062804-A (KR)
Inventor: TAMURA ITARU
IPC: H01L27/04
Filed: 2000-12-28
Abstract: PURPOSE: To provide a failure analysis semiconductor device, in which the time required for analyzing a failure can be shortened and a failure detection rate can be also improved. CONSTITUTION: Memory cells, which store data are provided, and a bit line pattern 13A provided with projections and connected to the memory cells is formed. Furthermore, a bit line pattern 13B provided with projections and connected to the memory cells is provided, separating from the bit line pattern 13A by a prescribed space on the same wiring layer with the bit line pattern 13A. In this way, the bit line patterns 13A and 13B are provided, by which the minimum space between the bit line patterns 13A and 13B is elongated in length.
Patent KR-20020055002-A (KR)
Title: oil suppling device of balance piston for continuously variable transmission
Inventor: LEE CHUNG SEOP
IPC: F16H9/18
Filed: 2000-12-28
Abstract: PURPOSE: A balance piston oil supply device of a continuously variable transmission is provided to reduce the length of the inner bore processing portion of a shaft, to secure the stabilized axial stiffness, and to easily process a shaft by bypassing a lubricating path to a slip joint between a movable sheave and a transfer drive gear. CONSTITUTION: A lubricating path(34) for supplying an operating oil to a balance piston(22e) is formed in a secondary movable sheave(22b). The entire length of the lubricating path is reduced in the secondary movable sheave. The lubricating path is extended along the inner faces of a transfer drive gear(24), a parking gear(24a), and a bearing(24b) on the outer face of the secondary movable sheave, and is communicated with the inner part of the balance piston. By filling the inner space of the balance piston with the operating oil, the centrifugal hydraulic pressure due to the operating oil in a secondary hydraulic chamber(22c) is compensated. According to the reduced length of the lubricating path, the degradation of the axial stiffness to the secondary movable sheave is prevented.
Patent KR-20020056079-A (KR)
Title: Method for manufacturing semiconductor package
Inventor: BAE SEONG GIL
IPC: H01L21/52
Filed: 2000-12-29
Abstract: PURPOSE: A method for fabricating a semiconductor package is provided to greatly reduce the quantity of thrown-away both-side tape, by attaching both-side tape to respective semiconductor package regions of four rows while using a punching unit having the same type of rows. CONSTITUTION: A diagonal row of a plurality of semiconductor package regions(16) formed on a circuit film(10) is set by a transfer pitch unit. The punching unit(12a) having the same type of row is disposed over the semiconductor package region of the diagonal row. Two rows of both-side tape(14) passing through a gap between the circuit film and the punching unit are fed. Both-sides tape is punched by the punching unit of the diagonal row. The both-sides tape punched by the punching unit is simultaneously attached to each chip attach region(18) in the respective semiconductor package regions composed of the diagonal row. The circuit film is transferred by a pitch unit so that the semiconductor package region of the next diagonal row is positioned under the punching unit. The both-sides tape is fed as a pitch unit while the circuit film is transferred by a pitch unit, so that a portion not punched by the punching unit is positioned under the punching unit.
Patent KR-20020056083-A (KR)
Title: Electron gun for cathode ray tube provided with planar cold-cathode for electronic emission
Inventor: JU HAK RIM
IPC: H01J29/48
Filed: 2000-12-29
Abstract: PURPOSE: An electron gun of a cathode ray tube having a plate cold cathode for electron emission is provided to avoid leakage of electron and drive the cold cathode with a lower voltage. CONSTITUTION: An electron gun(100) of a cathode ray tube is mounted on a cathode(200). The cathode(200) includes insulators(202) formed by a support electrodes(201), and driving electrodes(203) supported by the insulators(202). An electron emission device(206) is formed on a substrate(205) that is attached on the top of the driving electrode(203). An electron drawing electrode(220) is arranged over the electron emission device(206). Electrons drawn by the electron drawing electrode(220) is focused to a beam by electron suppressing electrodes(210). Focusing electrodes(230) focus and accelerate the beam. A lead(204) is coupled to the bottom of the driving electrode(203) to apply a signal for adjusting the amount of the beam.
Patent KR-20020056347-A (KR)
Title: Method of manufacturing a semiconductor device
Inventor: KIM JIN HA
IPC: H01L21/334
Filed: 2000-12-29
Abstract: PURPOSE: A method for packing a semiconductor device is provided to prevent interlayer step difference caused from different pattern densities of I-line stepper equipment in forming gate electrodes or from structural difference of an under layer formed under an inter connection line. CONSTITUTION: A field oxide layer(12) and a gate electrode(13) are formed on the semiconductor substrate(11). A dummy gate(13') is formed on the field oxide layer. An interlayer dielectric(15) is covered over the gate oxide and the dummy gate. A metal line(16) is formed on the interlayer dielectric.
Patent KR-20010021498-A (KR)
IPC: H01H50/32
Filed: 1998-05-29
Abstract: 본 발명에 따른 전류 펄스에 의해 구동되는 기계적 래치 리레이는 전자기 발생 유닛, 연결 수단 및 기계적 잠금 수단으로 구성되고, 전류 온/오프의 효과적인 제어를 할 수 있게 하여 오랜 시간동안 전류의 제공을 필요로 하지 않고 전류 온/오프의 안정한 동작 상태를 제공할 수 있도록 하기 위하여 리레이를 구동시키는 전류 펄스가 사라질 때 존재하는 동작상태를 유지하고, 다른 전류 펄스가 제공될 때 그 동작상태를 변화시킬 수 있으며, 비록 펄스가 사라져도 동작상태를 유지한다.
Patent KR-20010022159-A (KR)
IPC: H04N7/12
Filed: 1998-07-23
Abstract: 전송 시스템(12) 내의 정보신호에 대한 선형 왜곡을 보상하는 장치(10)이다. 시스템(12) 내에서 정보신호는 증폭기(62)를 갖는 트랜스미터(24)로 진행된다. 샘플신호는 트랜스미터(34)로부터 검출된다. 시스템(12)의 선형 왜곡 동작은 의도하는 값으로부터 떨어진 적어도 하나의 신호상의 변동을 포함한다. 정보신호의 신호 스트림을 따라 트랜스미터(34)를 향해 위치하는 선형 프리-이퀄라이져(54)는 정보신호를 프리-이퀄라이징한다. 트랜스미터(34)를 향해 신호 스트림의 밖에서 샘플신호와 정보신호를 수용하도록 연결된 적응형 방정식 결정(70)은 시스템(12)의 선형 왜곡 동작을 보상하는 선형 프리-이퀄라이져(54)로부터 필요한 프리-이퀄라이제이션의 양을 결정한다. 선형 프리-이퀄라이져(54)에 의한 프리-이퀄라이제이션은 적응형 방정식 결정(70)에 의한 결정에 따라 수정된다.
Patent KR-20010023392-A (KR)
Title: 점도 측정 장치 및 사용방법
Filed: 1998-08-26
Abstract: 혈액 점도 측정 시스템 및 방법은 넓은 범위의 전단력에서 혈액 점도를 결정 하기 위하여 생물의 생체내 혈액을 나타내는 유체 컬럼의 헤드의 상승을 모니터하는 것이다. 시스템은 적어도 일부분이 생물의 혈관계내에 위치한 모세관 및 모세관에 연결된 액체를 갖는 수직관을 포함한다. 센서와 연결된 마이크로프로세서는 계측되는 점도로부터 튜브의 길이를 따라 다수의 위치에서 수직관에 있는 액체의 높이의 변화를 결정하기 위하여 제공한다.
Patent KR-20010024247-A (KR)
Title: 비트로넥틴 수용체 길항제
IPC: A61P9/00
Filed: 1998-09-24
Abstract: 본 발명은 비트로넥틴 수용체 억제제이며, 골다공증의 치료에 유용한 하기 화학식 I의 화합물 또는 그의 제약학적으로 허용되는 염에 관한 것이다. 
     ＜화학식 I＞
Patent KR-20010034318-A (KR)
IPC: B65D47/20
Filed: 1999-01-20
Abstract: An object of the invention is to measure out precisely the liquid to be poured out and applied, to safely achieve the firm assembly of components and to obtain effective function of displays. An applying stopper (1), which changeovers communication of a measuring chamber (A) formed by rotational operation between a bottle unit (8) and a pouring out mouth (55), is attached to a bottle unit 8. The measuring chamber (A) is structured by parts that cannot be deformed. Inseparable assembling of an attaching unit (2) and a switching unit (4) of the applying stopper (1) is achieved by bending displacement of engagement coupling function parts. An assembling position of the applying stopper (1) with respect to the bottle unit (8) in the circumferential direction is aligned.  <IMAGE>
Patent KR-20010034367-A (KR)
Title: 음성 인식에서 무음을 사용한 시스템
IPC: G10L15/05
Filed: 1999-02-09
Abstract: 음성을 지시하는 입력 데이터 스트림에 기초하여 음성을 인식하는 시스템(60)은 노드에 접속된 복수개의 음운 브랜치를 포함하는 접두 트리(88)로서 입력 데이터 스트림으로 표시되는 가능 워드를 공급한다. 복수개의 음운 브랜치는 접두 트리의 입력부의 무음에 대응하는 적어도 하나의 입력 무음 브랜치(92) 및 접두 트리(60)의 출력부의 무음에 대응하는 적어도 하나의 출력 무음 브랜치(94, 96, 98)에 의해 브래킷된다. 접두 트리(60)는 수평 이동시켜서 입력 데이터 스트림으로 표시되는 워드를 얻기 위하여 수평 이동된다. 접두 트리에 공급된 무음은 문맥에 기초하여 가변한다.
Patent KR-20010041455-A (KR)
Title: 폴리프로필렌계 수지조성물 및 그것으로 된 포장용 연신필름
IPC: C08L23/20
Filed: 1999-02-26
Abstract: 본 발명은 결정융점이 l30℃ 이상인 폴리프로필렌계 수지(A) 60∼99중량부, 방향족 비닐화합물과 공액디올레핀으로 된 공중합체의 수소첨가물(B) 1∼40중량부, 상기 (A)와 (B)의 합계 l00중량부에 대해 JIS K2283에 의한 37.8℃에서의 동점도가 10∼2,000,000cSt인 폴리부텐(C) 0.l∼20중량부, 점착성 부여제(D) 0.1∼20중량부 및 점착성 부여보조제(E) 0∼5중량부로 된 폴리프로필렌계 수지조성물 및 폴리프로필렌계 수지(A) 95∼100중량부와 상기 공중합체의 수소첨가물(B) 0∼5중량부 미만의 합계 100중량부에 대해, 폴리부텐(C) 5∼20중량부, 점착성 부여제(D) 0.l∼20중량부 및 점착성 부여보조제(E) 0.01∼1중량부로 된 폴리프로필렌계 수지조성물, 더 나아가서는 이들 폴리프로필렌계 수지조성물로 된 포장용 연신필름에 관한 것이다.
Patent KR-20010074454-A (KR)
Title: 동결건조된 정자가 주입된 난자로부터 정상적인 자손의 발생
IPC: A01N1/02
Filed: 1999-03-18
Abstract: 본 발명은 정자 머리(핵)가 난자를 수정시켜서 생명체를 생산할 수 있는 한 개 이상의 복원된 정자를 얻기 위한 동결건조 정자에 관한 방법을 제공한다.  동결건조되고 실온에서 진공하에 저장된 정자의 운동성은 재수화될 때 회복되지 않는다.  정자의 플라즈마 막은 파괴되고 통용되는 의미로 상기 정자들은 모두 죽어있는 상태이다.  그러나, 상기 정자를 난자내로 미세수술로 주입하면, 그들의 핵이 수컷 전핵으로 이동하여 정상적인 배 발생에 참여하게 된다.
Patent KR-20010042434-A (KR)
IPC: C07D403/12
Filed: 2000-02-24
Abstract: Novel neovascularization inhibitors are constructed to provide antitumor agents which are superior in safety to conventional antitumor agents, are surely efficacious and can be administered over a prolonged period of time. Namely, indole compounds represented by general formula (I) or pharmacologically acceptable salts thereof or hydrates of the same wherein R<1> represents hydrogen, etc.; R<2> and R<3> are the same or different and each represents hydrogen, etc.; R<4> represents hydrogen or lower (C1-4) alkyl; and the ring A represents cyanophenyl, etc., provided that the following cases are excluded; the one where R<1>, R<2> and R<3> are all hydrogen atoms; the one where R<2> and R<3> are both hydrogen atoms; and the one where the ring A is an aminosulfonylphenyl group and R<1> and R<2> are both halogen atoms; and provided that when the ring A is a cyanophenyl, 2-amino-5-pyridyl or 2-halogeno-5-pyridyl group and R<1> is a cyano group or a halogen atom, then at least one of R<2> and R<3> is not hydrogen.  <CHEM>
Patent KR-20010071271-A (KR)
Title: 방사선 및 성장 인자 수용체 티로신 키나아제 억제제에의한 사람 종양의 치료법
IPC: A61K38/00
Filed: 1999-05-14
Abstract: 본 발명은 사람 환자를 방사선 및 과도발현이 종양발생을 야기할 수 있는 단백질 수용체 티로신 키나아제의 방사성 표지되지 않은 억제제의 조합 유효량으로 치료하는 것을 포함하는, 사람 환자에서 종양의 성장을 억제하는 방법에 관한 것이다.
Patent KR-20020060376-A (KR)
Title: Apparatus and method for surfing a web site using a digital versatile disc
Inventor: AHN HYEON
IPC: G06F17/00
Filed: 2001-01-10
Abstract: PURPOSE: An apparatus and a method for web surfing are provided to enable a user to check the information of a product displayed on a DVD(digital versatile disc) video screen, and to connect the Internet to a web site that provides detailed information of the product. CONSTITUTION: An optical pickup(2) reads a signal stored in a DVD(1). An RF(radio frequency) signal process part(3) converts the signal read by the optical pickup(2) to an RF signal. A digital signal process part(4) converts the RF signal output from the RF signal process part(3) to a digital signal. A decoder(6) decodes the digital signal applied from the digital signal process part(4) in order to recover original digital data. An encoder(7) encodes the digital data from the decoder(6) to have an NTSC(national television system committee) format or a PAL(phase alternating by line system) format that can be acceptable in a video display unit. An interface part(8) includes a communication protocol for connection to the Internet(20). An Internet signal process part(9) processes an Internet data stream received via the Internet(20). A system controller(5) controls all parts mentioned above.
Patent KR-20010044226-A (KR)
Inventor: JUNG HYEONG DONG
IPC: B21D51/24
Filed: 2001-01-18
Abstract: PURPOSE: A method for manufacturing a high pressure container of a cooling can is provided to simplify the progresses of manufacturing and to improve productivity by a method of connection among molecules by using the brazing progress inside the boiler. CONSTITUTION: In the method for manufacturing the high pressure container of the cooling can, a few stages are included. In the first stage, an upper board and a lower board are formed by processing a metal film with pressing. In the second stage, the upper board and the lower board are assembled in the state of inserting the filler metal on the connected part and an edge portion is pressed after connecting a jetting body. In the third stage, the upper board and the lower board are sealed and connected by the melted filler metal. In the fourth stage, a container assembly of the serial type is bent and is changed into the parallel type. In the fifth stage, the external face of the container assembly is plated and coated. In the sixth stage, the rubber and nuts are assembled on the jetting body.
Patent KR-20020061882-A (KR)
Title: Method for vidio phone voice circuit system using analog phone
Inventor: KIM YONG HA
IPC: H04M11/06
Filed: 2001-01-18
Abstract: PURPOSE: A videophone voice circuit system using an analog phone is provided to execute an initial traffic without time delay for starting the traffic and generate bell sound by adding a ring generation circuit to the analog telephone. CONSTITUTION: A relay switch(7) switches telephone lines of a modem(6) and an analog phone(15) for outputting a telephone line signal. The analog phone(15) receives the telephone line signal for generating a voice output signal. A D/A converter(8) receives the voice output signal through the modem(6), a No.5 channel of the fourth multiplexer(14), and a handset-connecting part(16) in case of the power failure, and receives digital signals from a voice part(10) for converting into analog voice signals. The third multiplexer(13) receives a speaker signal output through a B terminal of the fourth multiplexer(14) having been received the analog voice signals by No.6 and No.7 channels. The speaker signal are multiplexed to be output to a No.1 channel, an external voice input and output part(5), or a No.4 channel.
Patent KR-20010078017-A (KR)
Title: Glass article and glass substrate for display panel
Inventor: GODA TAKUJI
IPC: H01J17/16
Filed: 2001-01-19
Abstract: PURPOSE: A glass article is provided to prevent the diffusion of metal ions, and a glass substrate for a high-quality display comprising the aforementioned glass article. CONSTITUTION: The glass article comprises an alkali-containing glass substrate(1), and a barrier film(2) formed on a surface of the alkali-containing glass substrate(1). The metal ion diffusion barrier film(2) mainly contains indium oxide and/or tin oxide. A glass substrate for a display comprises: an alkali-containing glass substrate(1); an alkali ion diffusion barrier film formed on a surface of the alkali-containing glass substrate(1); a barrier film(2) mainly containing indium oxide and/or tin oxide; an insulating film; and an electrode film(4). The surface electrical resistance of the insulating film is kept in a range from 1.0x106 OMEGA/square to 1.0x1016 OMEGA/square even after heating process at 550 deg.C for 1 hour.
Patent KR-20020063385-A (KR)
Title: Low Power Memory storing method for compressed MPEG Image and its frame buffer structure
Inventor: YOO HOE JUN
IPC: H04N7/26
Filed: 2001-01-29
Abstract: PURPOSE: A method for storing MPEG(Moving Picture Experts Group) compression image in a memory to reduce power consumption and a frame buffer structure therein are provided to integrate a frame buffer with logic, and to store data in a distributed 9-tile mapping type, so as to appropriately cope with application areas for processing MPEG image signals with low power consumption. And the frame buffer structure is provided to have 8 banks in a sub word line system capable of partial activation. CONSTITUTION: An optional image frame is divided into 8 by 8 pixel areas. The each divided block area is reestablished to mutually adjacent 9 block areas in a 3 by 3 type. The 8 by 8 pixel areas each consisting of the 9 mutually adjacent block areas reestablished in the 3 by 3 type are mapped to one row. The 8 by 8 pixel areas mapped to one row are distributed and stored in mutually different banks. Each of 64 pixels configuring the 8 by 8 pixel areas is represented with information of 8 bits, and one row stores information of 512 bits in total.
Patent KR-20020064842-A (KR)
Title: Appratus for controlling pressure of semiconductor manufacturing equipment
Inventor: KIM BU EOP
IPC: H01L21/205
Filed: 2001-02-03
Abstract: PURPOSE: An apparatus for controlling pressure in a semiconductor manufacturing equipment is provided to stabilize a pressure control by correcting a value of a pressure sensor according to changes of a peripheral temperature. CONSTITUTION: A pressure control apparatus comprises a pressure sensor(301) for detecting a pressure of a reaction furnace(101), a temperature sensor(303) for detecting a temperature of the surface of the pressure sensor(301), a pump for exhausting a reactive gas from the reaction furnace(101) and a controller for controlling the pump so as to keep a constant pressure in the reaction furnace(101) using a corrected pressure value after correcting the pressure value with the temperature value by receiving the pressure and temperature values respectively detected from the pressure sensor(301) and the temperature sensor(303).
Patent KR-20020067079-A (KR)
Title: analyzer of semiconductor device ion implanter equipment
Inventor: KIM SEONG JU
IPC: H01L21/265
Filed: 2001-02-15
Abstract: PURPOSE: An apparatus for analyzing mass of ion implanting equipment of a semiconductor device is provided to replace or maintain each constitution including a graphite layer, by making a chamber composed of chamber plates easily assembled and disassembled and by making a supporting unit have such a constitution to easily assemble/disassemble other constitution. CONSTITUTION: The chamber plate(40a,40b) is of a shape curved to a side regarding the migration path of ions. At least one of an upper part, a lower part and both sides of the chamber plate is so coupled to be disassembled/assembled while maintaining a sealed state. A magnet(32) determines the migration path of ions, facing the upper and lower surface of the upper and lower parts of the chamber plate. The graphite layer(34) is installed on the outer surfaces of both side chamber plates. The supporting unit(46a) fixes the outer portion including each chamber plate, the magnet and the graphite layer, selectively surrounding the outer portion.
Patent KR-20020067355-A (KR)
Title: Method for optimizing control of sub-body opening/closing in automatically and manually folded portable mobile terminal
Inventor: KIM SANG SUN
IPC: H04M1/02
Filed: 2001-02-16
Abstract: PURPOSE: A method for optimizing the control of the opening and closing of a sub body in an automatic/manual foldable portable phone is provided to optimize automatic open and close control for the folder of a portable phone. CONSTITUTION: If a user gives a self-diagnosis start command after opening a sub body(900), a control part initializes parameters M1 and M2(902). Then the control part executes motor driving control so that the sub body can be closed(904). Afterwards, the control part measures motor driving amperages, sensed by a current sensing part, as corresponding code values at intervals of 30msec(906). Then the control part judges whether a detection signal corresponding to "completely closed" is supplied from a close sensor(908). If the detection signal is supplied from the close sensor, the control part obtains M1 from the current code values measured before the detection of the close sensor(910). The control part measures motor driving amperages, sensed by the current sensing part, as corresponding code values at intervals of 30msec(912). Then the control part judges whether a given time elapsed after the detection of the close sensor(914). If the given time elapses, the control part stops motor driving(916). Then the control part obtains M2 from the current code values measured after the detection of the close sensor(918). The control part obtains a current threshold using M1 and M2(920) and applies the obtained threshold to the terminal(922).
Patent KR-20010074108-A (KR)
Inventor: KIM SEONG SU
IPC: C04B18/14
Filed: 2001-02-21
Abstract: PURPOSE: A cement admixture composition comprising fine slag powder as a main component, gypsum and kiln dust is provided which saves manufacturing costs and promotes rapid hydration of slag powder, resulting in increasing the amount of cement substitution without deterioration of properties. CONSTITUTION: The composition comprises 80-85wt.% of fine slag powder having 3500-4500cm¬2/g of surface area, 3-5wt.% of gypsum having 5000-6000cm¬2/g of surface area, and 10-15wt.% of kiln dust more than 8000cm¬2/g in surface area. The concrete composition is characterized by substituting cement for admixture by 10-30wt.%, based on the weight of cement.
Patent KR-20010085473-A (KR)
Title: Manufacture of a cyclic acid
Inventor: FLECKENSTEIN JUERGEN
IPC: C07D491/048
Filed: 2001-02-22
Abstract: PURPOSE: Provided is a manufacture method of 2-oxo-1,3-dibenzyl-cis-4,5-imidazolidine dicarboxylic acid or 2-oxo-1,3-dibenzyl-cis-4,5-imidazolidine dicarboxylic anhydride by using dialkali metal salt type of meso-2,3-bis(benzylamino)succinic acid as a starting material. CONSTITUTION: The manufacture method comprises the steps of: reacting meso-2,3-bis(benzylamino)succinic acid with phenyl chloroformate in a solvent system consisting of water miscible ether and alkali metal hydroxide solution in a ratio of 2:1 to 1:1; converting the produced 2-oxo-1,3-dibenzyl-cis-4,5-imidazolidine dicarboxylic acid dialkali metal salt into 2-oxo-1,3-dibenzyl-cis-4,5-imidazolidine dicarboxylic acid by oxidization; or heating the 2-oxo-1,3-dibenzyl-cis-4,5-imidazolidine dicarboxylic acid with acetic anhydride in aromatic hydrocarbon as an organic solvent, to convert it into 2-oxo-1,3-dibenzyl-cis-4,5-imidazolidine dicarboxylic anhydride.