baber/WOPTO huggingface dataset:
Patent KR-20000004579-A (KR)
Title: Method for checking analog interface normal operation in private switching system
Inventor: MIN KYUNG HWA
IPC: H04M3/22
Filed: 1998-06-30
Abstract: PURPOSE: A method for checking analog interface normal operation in a private switching system senses a state that a digit generated from DTMF generator of the private switching system is received in a DTMF receiver, and checks B-channel normal operation if analog interface. CONSTITUTION: B-channel operation state checking method of analog interface determines time having the smallest communication quantity. If the time having the smallest communication quantity is determined, the method detects a port not a busy line state in the line interface card. The method controls a switching operation for connecting DTMF generator to a transmitting terminal of the detected port and for connecting DTMF receiver to a receiving terminal of a corresponding port, and transmits a predetermined digit through the connected port by controlling the DTMF generator. The method detects that DTMF signal corresponding to the same digit as the transmitted digit is received to the DTMF receiver through the port. Thereby, although the private switching system is at on-line state, the method determines abnormal state of a communication line by automatically testing the port not used, and does not influence a communication operation of the private switching system by using the time having the smallest communication quantity.
Patent KR-19990013638-A (KR)
Title: 용접 방법 및 장치
IPC: B29C65/14
Filed: 1998-07-07
Abstract: 본 발명에 따른 필터는 제1 부재가 제2 부재에 결합되는 용접부를 가열하는데 사용되는 전자기적 방사선을 흡수하기 위한 것이다.  필터는 방사선이 용접부에 도달하기 전에 열발생원으로부터의 방사선 중 바람직하지 않은 파장을 흡수하기 위한 고체 재료를 포함한다.  또한, 필터는 그 내부에 유체가 담긴 챔버를 포함하는 하우징을 구비한다.  유체는 고체 재료를 냉각시키며 또한 방사선이 용접부에 도달하기 전에 열발생원으로부터의 방사선 중 바람직하지 않은 파장을 흡수할 수 있다.  필터링 공정 도중 유체를 냉각시키기 위해 열 교환기가 필터에 연결되어 있다.
Patent KR-19990013910-A (KR)
Title: 반도체장치
IPC: H01L27/108
Filed: 1998-07-15
Abstract: 제1 도전체막으로 구성되는 게이트전극이 실리콘기판 위에  형성되는 MOS트랜지스터;  실리콘기판 위에  형성되는 필드절연막 위에  형성되는 제2 도전체막으로 구성되는 저항소자; 및   필드절연막의 표면 위에 소정의 간격으로 평행하게  형성되는 복수의 도전체막패턴을 포함하고,  복수의 도전체막패턴은 소정의 전위에 접속되는 제1 도전체막으로 구성되고, 복수의 도전체막패턴 각각의 상면 및 측면은 절연막으로 피막되고,   저항소자는 복수의 도전체막패턴에 직교방향으로 복수의 도전체막 위의 절연막을 통하여 다수회 왕복횡단하는  형상으로  형성되는 반도체장치가 개시되어 있다.
Patent KR-19990014098-A (KR)
Title: 면 파스너
IPC: A44B18/00
Filed: 1998-07-23
Abstract: 성형 후크형 면 파스너(4)는 그 상부면(10)에 형성된 그루브(8)를 갖는다.  그루브(8)에는 결합 또는 접착재(12)가 충진되어 완제물에 대한 내전단성과 박리 강도가 증진된다.
Patent KR-20000009867-A (KR)
Title: Automatic conveyance vehicle driving method
Inventor: LEE KYUNG HO
IPC: H01L21/66
Filed: 1998-07-29
Abstract: PURPOSE: An automatic conveyance vehicle driving method is provided to make products smoothly carried using an automatic conveyance vehicle, to meet the requirement for change of product amount, and to efficiently use the automatic conveyance vehicle. CONSTITUTION: An automatic conveyance vehicle driving method comprises the steps of: loading after checking the position and status of a chamber for which a rack is loaded (S2); starting a predetermined process after loading (S28) of a program, removal (S30) of the rack, check (S32) of contact and insertion (S34) of the rack by manual operation of a worker; changing (S66) the information of a work assignment computer after changing the information of the work assignment computer, finishing the above process, and transmitting the work result; and unloading the rack to an automatic conveyance vehicle (S76).
Patent KR-20000010367-A (KR)
Title: Circuit for generating reference voltage
Inventor: LEE SANG HWAN
IPC: G05F1/52
Filed: 1998-07-31
Abstract: PURPOSE: A circuit for generating a reference voltage is to reduce a loss of unnecessary operating current and Icc static current by connecting a master slave circuit to an output terminal of reference voltage generation apparatus and by operating the reference voltage generation apparatus and master slave circuit by a sense amp enabled signal. CONSTITUTION: A circuit for generating a reference voltage consists of: a reference voltage generation apparatus(11), which outputs a satisfactory reference voltage according to the output of sense amp enabled signal; and a master slave circuit(12), which outputs a stable reference voltage after latching the reference voltage generated from the reference voltage generation apparatus(11) according to the output of sense amp enabled signal.
Patent KR-19990023697-A (KR)
Title: 가스백 충격 보호 장치 및 가스백을 접기 위한 방법
IPC: B60R21/201
Filed: 1998-08-19
Abstract: 자동차 탑승자를 위한 가스백 충격 보호 장치는 팽창 장치와 접힌 가스백을 수용하는 튜브 용기 형태의 하우징으로 이루어지며, 팽창 장치는 길이방향으로 연장되는 튜브 발생기를 이루는 것이다.  가스백이 폭이 좁은 길이방향 연장의 저장형태로 이루어지며, 가스백은 결합된 접기 및 말기로 접혀진 상태로 되어, 이 가스백을 감싸는 보호 커버로 그 상태를 유지하는 것이다.
Patent KR-20000014321-A (KR)
Title: Precipitating agent for wastewater treatment and preparing method for above precipitating agent
Inventor: LEE MYUNG KOO
IPC: C02F1/52
Filed: 1998-08-19
Abstract: PURPOSE: A precipitating agent for wastewater treatment is prepared in the form of a chitosan-concentrated water soluble powder and can be semi-permanently stored without a limit of the use period. CONSTITUTION: A method for preparing a precipitating agent for wastewater treatment comprises the steps of:mixing 1 wt.% of a weak acid and 1-3 wt.% of chitosan in water as a solvent; stirring the mixture to dissolve the chitosan; freeze drying the liquid precipitating agent obtained from the stirring step; and pulverizing the solid precipitating agent in a predetermine size, wherein 0.1-10 wt.% of the weak acid and 1-50 wt.% of chitosan are mixed in water.
Patent KR-20000014740-A (KR)
Title: Horizontal insulation gate bipolar transistor
Inventor: KIM YOUNG CHEOL
IPC: H01L29/70
Filed: 1998-08-24
Abstract: PURPOSE: A horizontal insulation gate bipolar transistor is provided to suppress a production of a latch-up appearance by increasing a bypass of a hole current and increasing a resistance between an emitter electrode and an n-type emitter layer. CONSTITUTION: The horizontal isolation gate bipolar transistor is formed using a semiconductor active layer in which a drift layer of a first conductive type is formed on an insulation layer. In a surface region of the drift layer is selectively formed a base layer(140) of a second conductive type. An emitter layer(150) of the first conductive type is formed at a surface region of the base layer. The emitter layer comprises a first emitter region(150a) formed with a tripe type, a second emitter region(150b) of a stripe type formed spaced apart in parallel with the first emitter region, and a third region(150c) connecting the first and second emitter regions. A collector layer of the second conductive type is selectively formed at a surface region of the drift layer, and is formed spaced apart in parallel with the base layer. The gate electrode is formed on a surface region between the base layer and the drift layer so as to be insulated. The emitter electrode(190) is formed so as to be electrically connected with the first emitter region of the emitter layer and with the base layer, and the collector electrode(200) is formed so as to be connected with the collector layer.
Patent KR-20000015311-A (KR)
Title: Circuit for controlling motor of switching regulator type
Inventor: CHOE BYUNG KWON
IPC: H02P27/06
Filed: 1998-08-28
Abstract: PURPOSE: A circuit for controlling a motor is provided to control the magnitude of source voltage of the motor corresponding to a control signal although a converter circuit is established with a large time constant. CONSTITUTION: A low voltage detecting/comparing circuit(100) detects low voltage from output voltage wave of each phase of a motor, compares with reference voltage, and generating a low voltage comparing signal(PCS). A chopping wave generating circuit(200) generates a chopping wave swing between established maximum value and minimum value with the constant cycle. A comparator(300) receives the chopping wave voltage as the reference voltage and compares a level of the low voltage comparing signal. A converter circuit(400) operates in the case that the level of the low voltage comparing signal belongs to a range of the maximum value and the minimum value of the copping wave, and increases level of source voltage of the motor in the case that the output voltage of the comparator(300) is low level and decreases the level of source voltage of the motor in the case that the output voltage of the comparator(300) is high level. A time constant control circuit(500) operates in the case that the level of the low voltage comparing signal does not belong to the range of the maximum value and the minimum value of the copping wave, and decreases level of source voltage of the motor in the case that the output voltage of the comparator(300) is higher than the maximum value of the copping wave voltage regardless of a control of the converter circuit(400) and increases the level of source voltage of the motor in the case that the output voltage of the comparator(300) is lower than the minimum value of the copping wave voltage regardless of the control of the converter circuit(400).
Patent KR-20000018318-A (KR)
Title: Cellulosic carbonate derivatives and production method of regenerated cellulosic fiber using it
Inventor: RYU DONG IL
IPC: C08B16/00
Filed: 1998-09-01
Abstract: PURPOSE: A method is provided to produce a regenerated cellulosic fiber by melting the cellulose having the high polymerizing degree. CONSTITUTION: A production method of the regenerated cellulose fiber comprises steps of: producing the sodium cellulose by processing a cellulose material with the sodium hydroxide aqueous solution; exposing and ripening the sodium cellulose by leaving in the air; removing the excessive sodium hydroxide by repeating a washing and a filtering processes the exposed and ripened cellulose; producing an active cellulose by processing the cellulose by the carbon dioxide as an activator of high pressure under pretreating solution; producing a cellulose carbonate derivate by repeating the washing and filtering processes the active cellulose; regenerating the cellulose by moisture-spinning the cellulose spinning solution during a bath to solidify.
Patent KR-19990029593-A (KR)
Title: 스크루 압축기
IPC: F04C18/16
Filed: 1998-09-07
Abstract: (과제) 슬라이드 밸브와 스크루 로터와의 접촉방지를 가능하게 한 압축기를 제공한다. 
     (해결수단) 토출측에 배치된 유체압력으로 작동하는 피스톤(5)에 의하여 피스톤 로드(6)를 통하여 진퇴가능하게 설치되고, 흡입측의 스크루 로터(1, 2)의 직경방향의 개구부의 크기를 조절하는 용량 제어용 슬라이드 밸브(3)를 구비한 스크루 압축기에 있어서, 슬라이드 밸브(3)의 흡입측의 단부의 스크루 로터(1, 2)로부터 떨어진 위치에서 스크루 로터(1, 2)의 축심과 평행하게 연장된 돌출부(8)와, 슬라이드 밸브와 함께 진퇴하는 돌출부(8)의 상기 스크루 로터(1, 2)의 축심측의 면(9)에, 상대적으로 미끄럼운동 가능하게 맞닿음하고, 돌출부(8)를 지지하는 지지부(10)를 설치하여 형성하고 있다.
Patent KR-20000020826-A (KR)
Title: Paper supplier of image forming device
Inventor: YOON GAP SIK
IPC: B41J11/00
Filed: 1998-09-24
Abstract: PURPOSE: A subsidiary paper inserting device of a paper supplier is provided to guide the center of the paper for preventing the center from folding and drooping caused by a small paper. CONSTITUTION: A paper supplier forms a groove(122) in a crank shaft(120) rotating for lifting a lifting board, and a rotating member(310) rotating along the crank shaft by inserting into the groove. Also the paper supplier installs a subsidiary paper inserting device(300) containing an operating member(320) pressing the paper by connecting to the rotating member, and an elastic member(330) inserted into the crank shaft for be placed in the groove of the crank shaft after operating the subsidiary paper inserting device. Therefore, the supplier prevents the center of the paper from folding and drooping. The rotating member installs a fixing unit fixing a connecting groove and a torsion spring and the operating member installs a hinge shaft and a fixing shaft groove.
Patent KR-20000021406-A (KR)
Title: Complex environment control unit for pigsty without windows and its method
Inventor: JANG DONG IL
IPC: A01K1/02
Filed: 1998-09-29
Abstract: PURPOSE: A complex environment control unit is provided which considers the factors affecting the growth of pigs, such as toxic gas like carbon dioxide or ammonia, humidity in the pigsty and temperature of outside of pigsty based on the controlling of body temperature of pigs, to enhance the production and reduce feed cost. CONSTITUTION: A complex environment control unit comprises the followings: a camera(1)to get images of pigs; a control part for classifying the behavior of temperature control by using the images, a computer(3) for inputting the data and deciding whether ventilation is in need; sensors(5) to measure temperature, humidity and concentration of carbon dioxide and ammonia gas; an exhaust equipment(7) for ejecting the air to outside; an air influx equipment(9) having stepping motor; and a heater(11).
Patent KR-20000024698-A (KR)
Title: Prefabricated fishing port being capable of putting flower
Inventor: HEO SUN NYEO
IPC: A01K63/00
Filed: 1998-10-01
Abstract: PURPOSE: A fishing port is provided which is capable of putting a flower, is easy an assembling and a disassembling, and can provide an emotionally stability and a power for observing the object by a beauty harmonized with a flower and an ornamental fish. CONSTITUTION: A fishing port being capable of putting a flower is prefabricated by laminating a large number of fishing port(20,50,70) up and down of a large number of guide pipe(30,60,80) located in the center. Also, there is formed a large number of tube(7) with constant interval in the inner circumference of the aquarium(20,50,70) to put a flower.
Patent KR-19990030332-A (KR)
Title: 저전압에서 동작 가능한 2-단계 아날로그-디지털 변환기 회로
IPC: H03M1/14
Filed: 1998-09-30
Abstract: 본 발명의 A/D 변환기는 감산 회로와 조제(coarse) A/D 변환기(AD1) 및 정제(fine) A/D 변환기(AD2)를 갖는 2-단계 A/D 변환기 회로라 칭하여진다. 
     본 발명의 목적은 더 낮은 전력 공급 전압에서 동작될 수 있는 2-단계 A/D 변환기 회로를 제공하는 것이다. 본 발명의 A/D 변환기 회로는 주로 감산 저항기(Rs)의 한 단부와 전력 공급 단자(Vcc) 사이에 전류원(Irs)을 가짐으로써 특징 지워진다. 
     버퍼(BF1)에 의해 표본화된 아날로그 레벨(V1)은 조제 A/D 변환기(AD1)로 공급된다. 감산 회로(SUB)는 D/A 변환기(DA1)와 감산 저항기(Rs)로 구성된다. 전류원(Irs)이 노드(3)에 제공되므로, 전류(IRs)는 감산 저항기(Rs)를 통해 노드(3)에서 노드(5)로 흐른다. 다른 말로 하면, 단자(2)에서의 전압(V2)은 표본화된 아날로그 레벨(V1) 이상으로 상향 쉬프트(shift)되거나 부스트(boost)된다. 
     그 결과로, 정제 A/D 변환기(AD2)에 공급되는 레벨은 상향 쉬프트된다. 따라서, A/D 변환기 회로의 대표적인 일부를 구성하는 각 트랜지스터는 전력 공급 전압이 낮고/또는 입력 아날로그 신호(V1)가 트랜지스터 작용을 실행하도록 비교적 큰 진폭을 가질 때에도 필요한 바이어스 전압을 수신할 수 있다.
Patent KR-19990007563-A (KR)
Title: 다이아몬드 공구의 제조금형
Filed: 1998-10-08
Abstract: 본 발명은 금속이나 석재 및 세라믹 등의 난삭재를 절삭할 때 사용되는 다이아몬드 공구의 제조금형에 관한 것으로서, 보다 상세하게는 소결 성형에 따른 생크와 다이아몬드 절삭팁의 소결시간을 단축하면서 제조금형 및 생크와 소결성형되는 다이아몬드 절삭팁과의 온도편차를 극소화하여 다이아몬드 공구의 제조에 따른 제품의 균일화 및 불량율을 극소화할 수 있는 다이아몬드 공구의 제조금형에 관한 것이다. 
     이러한 본 발명은 상기 가열로(60)의 열을 흡열하는 흡열면적을 최소화하도록 다이아몬드 공구의 생크(20) 위치부분에 다수의 열매체 유도통로(55)를 관통하여 이루어지고, 또한 가압수단(70)의 가압판(71)과 가열로(60)의 지지다이(61)는 각각의 하부면 및 상부면에 열매체 유도통로(55a,55b)를 다수 형성하여 상기 가압수단(70)의 가압판(71)이 하강하여 상부의 마감 제조금형(52)을 가압시에도 상기 열매체 유도통로(55a,55b)에 의한 열의 흐름이 지속적으로 각 제조금형(50,51,52)의 열매체 유도통로(55,55a,55b)를 통하여 유도되도록 한 것에 그 특징이 있다.
Patent KR-20000025609-A (KR)
Title: Cash structure having changeable line size
Inventor: NA MYUNG SU
IPC: G06F12/08
Filed: 1998-10-13
Abstract: PURPOSE: A cash structure with the changeable line size is provided to effectively obtain maximum hit ratio under any program by changing the line size according to the space or the time characteristic of the program. CONSTITUTION: A cash structure comprises a line size controlling part(100), a tag register(101, 102), a comparing part(103, 108), a register(104), a shift register(105, 106), a subtracting and adding part(107), a n and gate(NAND1), and an and gate(AND1). The tag register(101, 102) memorizes and shifts the cash address which is sequentially accessed from the tag memory(30). the comparing part(103) compares the tag stored at the tag register(102, 101). The register(104) stores the number of cash which synchronizes with the latch enable signal. The shift register(105, 106) stores the cash miss signal occurring at the cash controller. After passing through the NAND gate(104) and adding part, the information stored in the register(104) is compared at the comparing part. The comparing part outputs line size signal to cash controller.
Patent KR-20000028299-A (KR)
Title: Filter press
Inventor: KIM MAN JONG
IPC: B01D25/12
Filed: 1998-10-30
Abstract: PURPOSE: A filter press is provided to save cost since an additional filtering plate washer transmission unit is not necessary by transmitting the filtering plate washer with a filtering plate transmission device. CONSTITUTION: A filter press is composed of a pair of supporting units(1) mutually separated each other in parallel, a front and a rear head(3,5), a filter unit(9) having plural filtering plates(7), a movement head(11), a side bar(13) and a filtering cloth(15). Herein, if a residual cake is separated, a vibration unit(25) is raised by an elevation device(33), and at the same time, a washing nozzle(27) drops toward the filtering plate(7) so that the filtering plate and the filtering cloth are washed since washing water is sprayed to the filtering cloth installed between the separated filtering plates.
Patent KR-20000032263-A (KR)
Title: Rf match box
Inventor: KIM CHANG SIK
IPC: H01L21/48
Filed: 1998-11-13
Abstract: PURPOSE: An RF match box is provided to prevent the occurrence of error by minimizing RF power delivered to the gear of a rotation axis or to a motor without a grease as a lubricant between the rotation axis and a ground spring. CONSTITUTION: A ground unit(B) in an RF match box is consisted of a ground plate(18) and a ground spring(42). A rotation axis(40) is covered with the ground spring in the planar shape of the ground unit, and a recessed part in the center of the bow shaped ground plate is contacted to a rotator. The ground spring is not contacted to the rotator like the ground plate, but one end of the ground spring is directly connected to the rotator for being rotated with the rotator. Therefore, an additional lubricant such as grease is not needed to smoothen the space between the rotator and one end of the ground spring.
Patent KR-20000034406-A (KR)
Title: Device for opening a button box of television
Inventor: KIM YONG HUI
IPC: H04N5/64
Filed: 1998-11-30
Abstract: PURPOSE: A device for opening a button box of television is provided so that a damage of button is prevented beforehand and children can not view the television easily by pushing a button box internally and so making the button box integrated the button slide into internal space of a cabinet. CONSTITUTION: A device for opening a button box of television includes a button box mounting unit(1), a button door transfer unit(2) and a button box transfer unit(3). The button box mounting unit(1) is a space made by caving in one side of TV cabinet(5) internally. A guide groove(6) is formed at upper and lower side of the button box mounting unit(1). A door transfer groove(8) is formed at one side of the button box mounting unit(1). In the button door transfer unit(2), a button door(10) is inserted which has a fixing plate(9) on an internal side of the door transfer groove(8). A cable(12) is fixed to one side of the fixing plate(9) and is interposed by a spring(11). The other end of the cable(12) is fixed to a guide protrusion part(18) of a button box(14). The cable is supported by a plurality of rollers(15) set up on internal side of the cabinet(5). In the button box transfer unit(3), one end of a spring(11) is fixed to the guide protrusion part(18) inserted in the guide groove(6) and the other end of the spring(11) is fixed to one side of the cabinet(5). A fixing groove(19) is formed on lower side of the button box(17). A protrusion part(22) of an actuating knob(21) is supported by the fixing groove(19).
Patent KR-20000037883-A (KR)
Title: Demodulation device of cable modem
Inventor: KIM JONG HAN
IPC: H04L27/10
Filed: 1998-12-02
Abstract: PURPOSE: A demodulation device of a cable modem is provided to perform a high-speed data transmission by utilizing efficiently a bandwidth of data using an OFDM method. CONSTITUTION: A demodulation device of a cable modem comprises a symbol mapping portion(400), Nyquist filters(410,440), interpolation filters(420,450), serial/parallel converters(430,460), an IDFT portion(470), a multiplexer(480), and a D/A converter(490). The symbol mapping portion maps input data to I and Q signals. The Nyquist filters limits bands of the I and Q signals. The interpolation filters vary transmission rates by interpolating data. The serial/parallel converters serial I and Q signals to parallel I and Q signals. The IDFT portion performs an IDFT for the parallel I and Q signals. The multiplexer converts the output from the IDFT portion to a serial signal. The D/A converter converts the digital signal of the multiplexer to an analog signal.
Patent KR-20000039109-A (KR)
Title: Vehicle steering wheel
Inventor: BAK IN TEAK
IPC: B62D1/06
Filed: 1998-12-11
Abstract: PURPOSE: A vehicle steering wheel is provided to enable a driver to easily escape from a vehicle even though the driver is stuck between the rim of the steering wheel and a seat as well as not to give the driver serious impact at a head-on collision. CONSTITUTION: A steering wheel(100) installs a rim(120) outside a central body(110) and the rim is arranged along a circle outward the central body. The inner circumference of the wheel forms a second protruded connector(121) facing a first protruded connector(112). An elastic member(130) is installed between the central body and the rim, and installed in a groove(114) of the first protruded connector in order to elastically support the second protruded connector. When a head-on collision occurs, the rim and the second protruded connector are deformed for absorbing impact and preventing the driver from sticking between a seat and the steering wheel.
Patent KR-19990076554-A (KR)
Title: 엔.티.에스.씨 동일-채널 음성 반송파 주파수 근방의 반송파주파수를 가지는 잔류 측파대 디지털 텔레비젼 신호를전송하는 방법
IPC: H04N7/015
Filed: 1998-12-11
Abstract: 실질적으로 NTSC 색 부반송파 주파수의 3배인 심볼 레이트 f s 의 N-레벨 디지털 부호화 신호(여기서, N은 복수의 정수임)는, NTSC 동일-채널 아날로그 텔레비젼 신호의 존재에 지배를 받는 채널을 통해 전송하기 위하여, NTSC 음성 반송파의 수백 킬로 사이클내에서 주파수의 반송파 신호를 변조한다. 이러한 변조는 제1 및 제2진폭-변조 측파대를 발생시키는 억압-반송파 진폭-변조를 의미한다. 채널외부로 연장하는 진폭-변조 측파대의 소정 부분은 전송 신호에서 억압됨으로써, 제1진폭-변조 측파대를 반송파 신호에 주파수가 더 가까운 제2진폭-변조 측파대의 일부에 대해서만 영상을 제공하는 잔류 측파대로 만든다. 상기 반송파 신호로 부터 주파수가 더 떨어져 있는 상기 제2진폭-변조 측파대의 나머지 부분의 진폭 응답과 비교해 볼 때, 상기 반송파 신호에 주파수가 더 가까운 상기 제2진폭-변조 측파대의 일부와 상기 잔류 측파대의 진폭 응답은 상기 전송 신호에서 이등분된다. 억압 반송파와 동일한 주파수의 고정-진폭 파일럿 신호는 전송 신호에 포함된다.
Patent KR-20000040847-A (KR)
Title: Method for preparing slow-releasing chitosan fine capsule having biodegradable chitosan membrane
Inventor: LEE JEONG MIN
IPC: B01J13/16
Filed: 1998-12-17
Abstract: PURPOSE: A method for preparing slow-releasing chitosan fine capsule having a biodegradable membrane is provided which is able to provide the chitosan fine capsule having hydrophilic property and good stability and is easily control the capsule size and also possible to prepare the ultrafine capsule having a size of nanometer unit. CONSTITUTION: A slow-releasing chitosan fine capsule having a biodegradable membrane is prepared by: (i) preparing emulsion 1 by adding high molecular aqueous solution containing 0.3-10 wt.% of chitosan and 0.1-2 wt.% of acetic acid to an emulsifying solution; (ii) preparing emulsion 2 by adding an aqueous solution of cross link agent containing 0.5-10 volume% of sulfuric acid and 1-50 volume% of glutaraldehyde to an emulsifying solution; and (iii) mixing the emulsion 1 and the emulsion 2 in an equal amount ratio to form fine capsule by the interfacial emulsification between the high molecular chitosan and the cross link agent.