baber/WOPTO huggingface dataset:
Patent KR-20000010344-A (KR)
Title: Power saving method of cellular phone
Inventor: LEE SANG SEO
IPC: H04B1/16
Filed: 1998-07-31
Abstract: PURPOSE: A power saving method of a cellular phone lengthens a paging slot cycle at a set time in a standby state of a cellular phone, checks a paging slot, and thus achieves a power saving. CONSTITUTION: The power saving method of a cellular phone inputs a time zone for a power saving, and sets a power saving function if the present time reaches to the registered time zone. After that, the method indicates a period for checking the paging channel slot, provides a power-supply of a battery to a RF control part at every channel slot period, and checks a paging channel slot. Thereby, the use time of a battery is increased.
Patent KR-20000010385-A (KR)
Title: Bulletin board system using file system in web
Inventor: JEONG JIN SEONG
IPC: G06Q50/00
Filed: 1998-07-31
Abstract: PURPOSE: A Bulletin Board System(BBS) is provided to build a low-cost information interchange system by using file system of UNIX instead of using database system. CONSTITUTION: In the BBS having a message function providing information interchange system to many and unspecified web clients through a web server and a common gateway interface(CGI) program, the BBS forms a directory and a file structure through the CGI program. Bulletin data is classified and recorded by the BBS into each directory and into each files in the formed directory. The directory is divided into a directory for CGI program and a directory for saving bulletin data.
Patent KR-20000013752-A (KR)
Title: Communication method using estimated optimum propagation path
Inventor: LEE YOUNG DAE
IPC: H04B7/26
Filed: 1998-08-12
Abstract: PURPOSE: A method is provided to communicate with a mobile station using a searched optimum propagation path after the base station searches the propagation path for the mobile station and estimates in advance the optimum propagation path for the base station including a smart antenna. CONSTITUTION: The communication method using estimated optimum propagation path includes four stops. A first step is that an optional base station searches the optimum propagation path for own service area which is divided with a large number of area every the divided area. A second step is to store the searched optimum propagation path. A third step is that the base station recognizes an optimum mobile station position and control the beam direction of a smart antenna. A fourth step is to perform a communication between the mobile station and the base station using the optimum propagation path for the base station to indicate.
Patent KR-20000013920-A (KR)
Title: Cordless telephone
Inventor: HWANG GYU-HAN
IPC: H04M1/00
Filed: 1998-08-14
Abstract: PURPOSE: A cordless telephone improves a structure of a dual band pass filter which filters noises included in audio signal from the transmitter, and transmits the filtered audio signal to the outside through antenna, filters noises included in the high frequency signal from the antenna, and has a good attenuation characteristic. CONSTITUTION: A cordless telephone constructs a receiving band pass filter by an electromagnetic connection among a first lower part narrow hole(512), a second lower part narrow hole(522), and a third lower part wide hole(12). By an electromagnetic connection among a first upper part wide hole(511), a second upper part wide hole(521), and a third upper part wide hole(11), a transmission band pass filter is constructed, Accordingly, attenuation characteristic for removing unnecessary noise signal is very good, noises included in the high frequency signal and a modulation signal are all removed, and thus a transmission and receiving operations have a high sensitivity.
Patent KR-20000019228-A (KR)
Title: Composition rubber tile for preventing static electricity
Inventor: LEE JUNG HEE
IPC: C08L25/00
Filed: 1998-09-09
Abstract: PURPOSE: A composition of rubber tile is provided, which prevents static electricity and has good abrasion-resistance, scratch-resistance and colorful appearance. CONSTITUTION: A composition of rubber tile comprises 100 parts by weight of a natural rubber and /or a synthetic rubber; 1-10 parts by weight of polyol polymer; 1-20 parts by weight of polyethylene glycol ester or polyethylene glycol ether; 10-100 parts by weight of a silicoaluminated reinforcing agent comprising about 5% of sodium oxide and about 5% of water of crystallization; and a silane coupling agent. The silane coupling agent is represented by £(OR)3SiCnH2n|2Sm or (OR)3SiCnH2nX, wherein R represents methyl or ethyl group, n is an integer of 1-5, and X represents a mercapto or amine group, and is contained in amount of 0.1-5 parts by weight based on 100 parts by weight of silicoaluminated reinforcing agent. The synthetic polymer is styrenebutadiene rubber, acrylonitrilebutadiene rubber, isoprene rubber, chloroprene rubber, urethane rubber, butadiene rubber, or their mixture.
Patent KR-20000020004-A (KR)
Title: Method for controlling speed of rotor in rubber preparing mixer
Inventor: LEE YONG JIN
IPC: B29B7/80
Filed: 1998-09-17
Abstract: PURPOSE: A rotor speed controlling method is provided to control the rotating speed of a rotor of a mixer by sensing the mixing temperature of the rubber to be proper to the heat radiation property of the rubber supplied to the mixer. CONSTITUTION: A rotor speed controlling method comprises the steps of: sensing the temperature delivered from a thermocouple installed in a rubber producing mixer; determining the adjustment of the rotation of a rotor(2) by the sequence programmed in a computer according to the signals delivered from the thermocouple; and adjusting the rotating speed of the rotor by adjusting the rotating power of a DC power supply motor(4) in a PLC(Programmable Logic Controller) according to the rotor rotation adjustment signals of the computer. Herein, the rotating speed of the rotor is adjusted to be proper to the heat radiation property of rubber. Therefore, the rubber can be mixed at the predetermined range of temperature.
Patent KR-20000020890-A (KR)
Title: Method for forming gate electrode of semiconductor devices
Inventor: NAM JUNG SU
IPC: H01L21/336
Filed: 1998-09-24
Abstract: PURPOSE: A method of forming a gate electrode is provided to easily form the gate electrode by using a cobalt-slicide. CONSTITUTION: A method comprises the steps of forming a polysilicon layer(14) on a semiconductor substrate(10) having a gate oxide(12), forming a cobalt film(16) on the resultant structure, forming a cobalt-slicide film(18) at interface between the polysilicon layer(14) and the cobalt film(16) by implanting impurities into the semiconductor substrate(10), and forming a predetermined pattern by etching the resultant structure and forming a spacer(20) at both side walls of the pattern so as to form a gate electrode.
Patent KR-20000021074-A (KR)
Title: Low frequency detecting circuit
Inventor: KIM JU HAN
IPC: G11C29/12
Filed: 1998-09-25
Abstract: PURPOSE: A low frequency detecting circuit is provided to use an auxiliary delay signal as an internal clock signal of a system when a clock signal is a high frequency, and the clock signal as the internal clock signal of the system when the clock signal is a low frequency. CONSTITUTION: A low frequency detecting circuit comprises an auxiliary delay signal generating part(100) and a low frequency detecting part(101). The auxiliary delay signal generating part(100) receives an input signal(CK) to output an auxiliary delay signal(CK1) and a low frequency detection signal(NDAS1-NDAS7). The low frequency detecting part(101) receives the low frequency detection signals(NDAS1-NDAS7) to output a flag signal(SF). The low frequency detecting part(101) comprises a NAND gate and an inverter. The NAND gate logically calculates the low frequency detection signals(NDAS1-NDAS7), and the inverter inverts an output signal from the NAND gate to output the flag signal(SF).
Patent KR-20000021111-A (KR)
Title: Method for removing password
Inventor: KIM JIN PHIL
IPC: G06F21/45
Filed: 1998-09-25
Abstract: PURPOSE: A method for removing password in a system an authorized user or group only can use is provided so that a user can remember a password by reading help file without the password in case that the user cannot remember the password in use of the system locked with the password. CONSTITUTION: A user inputs a password for an authorized security system so as to be used by the user or group only(101). An edit picture is displayed to make a help file when an input of help file is selected(102). The user makes out contents to remember the password in the edit picture(103). The system stores the password and the help file if the help file is completely made(104). The system stores the password only if the user do not make the help file(105).
Patent KR-20000021791-A (KR)
Title: Laser cathode ray tube and method for manufacturing thereof
Inventor: PARK DEOK SEONG
IPC: H01J17/00
Filed: 1998-09-30
Abstract: PURPOSE: A laser CRT(Cathode Ray Tube) and a method for manufacturing thereof are provided, by improving a joining method a heat releasing layer and a sleeve. CONSTITUTION: A CRT(Cathode Ray Tube) comprises: a laser oscillator; a heat releasing layer for releasing heat generated from the laser oscillator; and a sleeve for being equipped on an outer circumference. A method for manufacturing the laser CRT comprises the steps of: cleaning a side which the heat releasing layer and the sleeve are joined; fixing the sleeve and the heat releasing layer to be separated in a predetermined interval; forming a thermosetting resin layer to be neighbored between the interval of the sleeve and the heat releasing layer; heating in a predetermined temperature, to join the heat releasing layer and the sleeve, by the thermosetting resin being melted; and hardening the thermosetting resin.
Patent KR-19990007560-A (KR)
Title: 고전압 방전을 이용한 폐수처리 장치
Filed: 1998-10-08
Abstract: 본 발명의 폐수 처리 장치는 하우징과, 하우징내에 내장되는 제 1 전극 및 제 2 전극을 포함한다. 하우징에는 공기의 유입 및 유출구, 그리고 폐수의 유입 및 유출구가 형성된다. 제 1 전극은 하우징 내의 공기 중에, 그리고 제 2 전극은 하우징 내의 폐수 중에 설치된다. 제 1 전극은 절연판에 의해 감싸지며, 제 1 전극으로 부터는 다수의 방전침이 폐수 표면 가까이로 돌출한다. 제 1 전극과 제 2 전극 사이에는 고전압이 인가된다. 본 발명의 폐수 처리 장치에서는, 제 1 전극과 제 2 전극 사이에서 방전되는 전자에 의해, 폐수의 고분자 화합물이 분해, 전리등의 작용에 의해 저분자 화합물로 직접 정화될 뿐 아니라, 하우징 내로 유입되는 공기가 이온화되고 산화 가스 성분을 함유하게 되어 추가적으로 공기 정화, 폐수 처리에 이용될 수 있다. 따라서, 본 발명의 폐수 처리 장치는 장치의 제조 비용 및 폐수 처리 비용을 크게 절감시킨다.
Patent KR-20000026346-A (KR)
Title: Ashing equipment having surface of exhaust pipe
Inventor: LEE KYUNG JU
IPC: H01L21/00
Filed: 1998-10-20
Abstract: PURPOSE: An asking equipment having an electro polished surface of exhaust pipe is provided to prevent particles from being dropped on the center of a wafer loaded by exhausting the asking resultants to be exhausted without being attached to an inner surface of the exhaust pipe, to be easily maintained, and to lengthen a cleaning cycle of an asking chamber. CONSTITUTION: An asking equipment having an electro polished surface of exhaust pipe comprises an asking chamber, and an exhaust pipe connected to the chamber and the equipment exhausts residual substances generated during the asking process. Since the inner surface of the asking chamber is treated by electro polishing method, the residue is not bond to the surface of the exhaust pipe.
Patent KR-19990044911-A (KR)
Title: 반도체 장치
IPC: H01L21/8249
Filed: 1998-10-28
Abstract: P형 반도체기판 상에 N - 형 영역이 확산에 의해 형성되고, N - 형 영역의 표면부에 P형 영역이 확산에 의해 형성된다. N - 형 영역의 외주부에는 고전압이 인가된 경우의 P형 반도체의 공핍층의 확대를 억제하기 위해 P + 형 영역이 형성되어 있다. 반도체 기판 상에는 게이트 산화막이 형성되고, 게이트 산화막 상에, 특히 반도체기판에 의해 형성되는 채널 영역 및 P + 형 영역 상에 다결정 실리콘에 의한 게이트 전극이 형성되며, 전체로서, 가로형 N채널 MOSFET과 동일한 구조를 형성한다. N - 형 영역 내에 회로소자가 형성되고, 고전압이 인가된다. 게이트 전극 및 소스 전극을 jq지하는 것으로 회로부의 분리를 행한다. 이와 같이 하여, 고전압 IC에 있어서 제조공정의 감소 및 고내압화 및 회로의 집적화를 도모한다.
Patent KR-20000027568-A (KR)
Title: Metal line structure of semiconductor device
Inventor: KIM SU CHAN
IPC: H01L21/28
Filed: 1998-10-28
Abstract: PURPOSE: A metal line structure of a semiconductor device is provided to improve electro-migration characteristics in a metal line by rapidly dissipating the heat generated from the metal line to maintain the temperature of the metal line low. CONSTITUTION: In a metal line structure of a semiconductor device, a dummy metal pattern for transferring heat is established in the vicinity of a metal line(23) to rapidly dissipate the heat generated from the metal line when the semiconductor device operates.
Patent KR-20000033072-A (KR)
Title: Arc exhaust apparatus of circuit breaker
Inventor: KIM KYUNG JOONG
IPC: H01H71/00
Filed: 1998-11-19
Abstract: PURPOSE: An arc exhaust apparatus of a circuit breaker is provided which can prevent the shortage phenomenon frequently occurred when an arc gas is exhausted to the external. CONSTITUTION: An arc exhaust apparatus of a circuit breaker prevents the shortage due to the arc. The circuit breaker acts as a role of protecting a cable or an electronic apparatus connected to a terminal of a load when an abnormal current is caused by an overload on an electric line or a short accident. The arc exhaust apparatus guides the moving direction of the arc as an insulation open/close plate is opened when the arc is generated, by installing a plurality of insulation open/close plates(12) to be able to be rotated with a pin(13) on an arc exhaust hole and by installing a spring(14) between the insulation open/close plate and the pin.
Patent KR-20000037570-A (KR)
Title: Heater control unit and method
Inventor: KIM YOUNG CHEOL
IPC: H05B3/20
Filed: 1998-12-01
Abstract: PURPOSE: A heater control unit and a method are provided to improve a cooking result by detecting a temperature of the surface of a food and determining the operating time of a heater. CONSTITUTION: A heater control unit comprises a sensing section(10) which detects the temperature of the surface of a food which is located in a cooking device. The detecting result is continuously inputted when the cooking of the food is processed. when the temperature of the surface of the food reaches a predetermined temperature, a controlling section(20) stops the operation of the heater of a heating section(30).
Patent KR-20000039572-A (KR)
Title: Method for monitoring troubles of network and system
Inventor: YANG JI SUK
IPC: H04L12/24
Filed: 1998-12-12
Abstract: PURPOSE: A method for monitoring troubles of a network and a system is provided to confirm a state of a system by performing only the data transmission using a UDP communication method of multi-casting. CONSTITUTION: A method for monitoring troubles of a network and a system comprises the following steps. One group reception packet comprising state information of a system according to a periodical time interval is transmitted to other system connected through a network. The state information of the system is updated and recorded when receiving a group reception packet comprising the state information from other system. The state information increases a state value within a group reception packet received from each other system.
Patent KR-19990024245-A (KR)
Title: 소박이 곱창 및 그 제조 방법
Filed: 1998-12-24
Abstract: 본 발명은 소박이 곱창에 관한 것으로서, 이 소박이 곱창은 그 내부에  야채, 과일 또는 해물이 충진되어 있다. 
     이 곱창은 곱창의 속에 야채나 과일을 충진함으로써 종래에는 야채나 과일을 곱창 주위에 두고 같이 굽는 방식으로 조리하여 곱창의 비린 맛이 완전히 제거되지 않는 단점을 개선할 수 있다.  또한 곱창의 질긴 육질이 연하게 되는 효과가 있고, 곱창을 씹을 때 생기는 입안의 텁텁함이 소멸되며 재료 각각의 맛과 향이 우러난다. 
     아울러 개인의 기호에 따라 야채나 과일을 택할 수 있으며 재료의 가감에 따라 단맛, 새콤한 맛, 단백한 맛, 매콤한 맛 등 여러 종류의 맛이 우러나는 곱창을 만들 수 있다.  이에 따라 남녀노소 누구나 즐길 수 있으며 복합적인 영양소를 섭취할 수 있다.  더욱이 종래의 곱창 조리법과는 달리 곱창의 내부를 완전히 세척함으로써 이제까지의 곱창 내부에 축적될 수 있는 불순물에 대한 거부감이 해소될 수 있다.
Patent KR-20000044189-A (KR)
Title: Fabrication method of thin film type optical path adjustment device
Inventor: RYU NA YOUNG
IPC: H01L27/10
Filed: 1998-12-30
Abstract: PURPOSE: A fabrication method of thin film type optical path adjustment device is provided to improve the structure of deformable layers to enhance the drive characteristics of actuator. CONSTITUTION: A fabrication method of thin film type optical path adjustment device comprises steps of: providing a first metal layer having drain pads to an active matrix; forming a first layer and a lower electrode layer on the first sacrifice layer; forming a second layer consisted of plural dielectric layers; forming an upper electrode layer; patterning the upper electrode layer, second layer and lower electrode layer to form actuators; patterning the first layer to form support units; and forming mirrors on the actuator.
Patent KR-20000044799-A (KR)
Title: Apparatus for generating discharge pulse in thin film micromirror array-actuated
Inventor: KIM SEONG JIN
IPC: H03K3/02
Filed: 1998-12-30
Abstract: PURPOSE: A discharge pulse generating apparatus in a thin film micromirror array-actuated(TMA) is provided to realize a perfect discharge of each pixel in a TMA panel by generating a discharge pulse having an extended period. CONSTITUTION: A discharge pulse generating apparatus comprises an inverter(102), first and second counter blocks(104,106) and a pulse generating block(108). The first counter block(104) receives an inverted version of a horizontal synchronous signal through the inverter(102) to count a high pulse period of the inverted version of the horizontal synchronous signal. The second counter block(106) counts a low pulse period of the horizontal synchronous signal. The pulse generating block(108) generates an extended discharge pulse in response to the counted values of the counter blocks(104,106). A start point of the extended discharge pulse is determined by an initial pulse of the counted value from the second counter block(106). An end point of the extended discharge pulse is determined after predetermined pulses of the counted value from the first counter block(104) after the counted value of the second counter block(106) is ended.
Patent KR-20000045176-A (KR)
Title: Electric washing machine using an electrolysis device
Inventor: JEONG SEUNG HO
IPC: D06F39/08
Filed: 1998-12-30
Abstract: PURPOSE: An electric washing machine using an electrolysis device is provided to prevent the environmental contamination by washing articles with alkali electrolytic water. CONSTITUTION: An electric washing machine using an electrolysis device comprises an electrolytic water amount regulating valve(303), an electrolysis device(305), an acid electrolytic water storing container(315), a tub(309), an electrolytic water discharging opening/closing valve(317), a water level detecting section(321), and a controlling section(323). The controlling section(323) receives signals form the water level detecting section(321), and controls the electrolytic water amount regulating valve(303) and the electrolytic water discharging opening/closing valve(317).
Patent KR-20000045266-A (KR)
Title: Transmission/receiving signal level compensation method of mobile terminal
Inventor: LIM JOO EUNG
IPC: H04B7/26
Filed: 1998-12-30
Abstract: PURPOSE: A transmission/receiving signal level compensation method is provided to maximize the performance of a mobile terminal by compensating a gain variated at each channel with an automatic gain adjuster. CONSTITUTION: A transmission/receiving signal level compensation method comprises receiving steps of converting a waiting state into a receiving state(S210,S220), recognizing a current state(S230), a microprocessor measuring a receiving strength on a receiving frequency signal(S240), comparing the measured data with a data lead from a EEPROM(S250), determining if the receiving strength is appropriate(S260), maintaining a current receiving strength(S270). The transmission steps comprises converting a receiving state into a transmission state(S310,S320), determining if a call connection exists(S330), maintaining a receiving strength(S340), re-compensating the receiving strength(S341) and measuring a transmission strength with respect to a current receiving strength(S350).
Patent KR-20000046997-A (KR)
Title: Method for controlling lubrication of high velocity spindle unit
Inventor: KANG GYEONG CHEOL
IPC: F16N5/00
Filed: 1998-12-31
Abstract: PURPOSE: A method is provided to control lubrication of a high velocity spindle unit in order to conduct a process at high speed when power interception occurs for a short time after removing an apparatus. CONSTITUTION: A memory(14) stores the present time data by checking a data(D1) through a timer(T1). Then a system compares the present time data with a prior data(D2). When the difference is within a regular time, an apparatus conducts a process at high velocity. When the difference passes through the regular time, a lubrication unit is continuously pumped to supply a lubricant using a timer(T3) over a time supplying the lubricant to a spindle unit.
Patent KR-19990064210-A (KR)
Title: 항말라리아 약제의 제조 방법
IPC: A61K31/4706
Filed: 1996-10-11
Abstract: 본 발명은 항말라리아 약제로서 유용한 퀴놀린 호합물을 제조를 위한 신규 중간 생성물 및 방법 및 상기 방법에 유용한 중간 생성물에 관한 것이다.  본 발명은 화학식(II)의 화합물을 화학식(III)의 화합물과 반응시키는 것을 포함하는 화학식(I)의 화합물의 제조를 위한 방법에 관한 것이다: 
     
       
     
     (I) 
     
       
     
     (II) 
     
       
     
     (III) 
     (상기식에서, 
     R 1 은 C 1-6 알킬이고, 
     R 2 및 R 3 은 개별적으로 수소, 할로겐, 트리플루오로메틸 또는 C 1-6 알콕시이고, 
     R 4 는 C 1-6 알킬이고, 
     R 5 은 수소 또는 C 1-6 알킬이며, 
     R 6 는 니트로 또는 아미노이고, 
     X는 이탈기이다).
Patent KR-19990067124-A (KR)
Title: 택산의 반합성용 중간체 화합물 및 이의 제조방법
IPC: C07F7/30
Filed: 1996-10-25
Abstract: 본 발명은 신규한 택산의 반합성용 중간체 및 이의 제조방법에 관한 것이다.  본 발명은 특히 옥사졸리딘 또는 옥사졸리디논의 유도체, 및 신규한 바카틴 III의 유도체에 관한 것이다.   본 발명에 따른 택산 합성의 일반적인 방법은 이전의 당해 분야의 일반적인 9 단계의 공정에 비해, 시장에서 입수 가능한 제품으로부터 오직 5 단계만으로 PACLITAXEL TM 과 같은 제품을 수득 가능하게 해 준다.
Patent KR-19990082041-A (KR)
IPC: A61K35/76
Filed: 1997-02-05
Abstract: The present invention relates to bacteriophages for use in the treatment or prophylaxis of bacterial infections, especially mucosal bacterial infections such as Helicobacter pylori infections. In particular, it relates to modified filamentous bacteriophages, e.g. M13 phages, for such use, which bacteriophages present at its surface a recombinant protein comprising: (i) a first component derived from a bacteriophage surface protein; and (ii) a second component comprising variable region sequences of an antibody to provide a bacterial antigen binding site, said second component rendering said bacteriophage capable of binding to and thereby inhibiting growth of bacterial cells involved in the etiology of said infection.
Patent KR-20000064608-A (KR)
Title: 사용자측전력관리시스템및방법
Filed: 1996-03-18
Abstract: 사용자측 전력 관리 시스템은 전력 공급 설비(L1, L2, L3, N)로부터의 전기 라인(12)에 연결된 전력 트랜스듀서(10)를 포함한다.  전력 트랜스듀서(10)는 전력 공급 설비(L1, L2, L3, N)로부터의 확률적인 전력 소유를 감지하며, 이에 비례하는 출력 신호를 제공한다.  소정 임계 신호(28 또는 32)역시 비교 회로(21)에 제공되어, 두 개의 신호가 비교된다.  AC/DC 컨버터(38) 또는 전력 공급 장치는 전력 공급 설비의 전기 라인(L1, L2, L3, N)에 연결되고 그 출력에 DC 전압을 제공한다.  DC 전압의 진폭은 비교 회로(21)의 출력 신호에 의하여 제어된다.  전력 격리와 배전 회로(48) 및 축전 배터리(34)역시 포함된다.  전력 격리와 배전 회로는 AC/DC 컨버터(38) 및 축전 배터리(34)사이에 연결된다.  전력 관리 시스템은 피크 전력 수요를 감지하고 AC/DC 컨버터(38)에 의하여 전원이 공급되는 사용자 특정 로드(46)를 축전 배터리(34)로 스위칭한다.  피크 전력 수요가 없으면, AC/DC 컨버터(38)는 특정 로드(46)에 전력을 공급한다.
Patent KR-20000016075-A (KR)
Title: Concentrated alkaline isotropic detergent liquid with bleach
Inventor: DAY MICHAEL JOHN
IPC: C11D3/42
Filed: 1997-05-28
Abstract: PURPOSE: A liquid detergent with hydrogen peroxide bleach for washing a concentrated alkaline isotropic fabric is provided to be formed by 23 % of surfactant and 0.2 wt% of hydrogen peroxide bleach. CONSTITUTION: A concentrated alkaline isotropic fabric washing liquid detergent composition comprising at least 23 % of surfactants and further comprising at least 0.2 % hydrogen peroxide bleach, the composition is substantially free from hydrotropes which cause the pH to reduce and impair the effectiveness of the composition. Also a concentrated alkaline isotropic fabric washing liquid detergent composition comprising at least 15 % by weight of surfactant further comprises at least 0.2 % by weight hydrogen peroxide bleach and an optical brightener and is also substantially free from hydrotropes. The compositions may be used as a main wash bleaching liquid or a pretreatment liquid and may be activated with a bleach activator.