baber/WOPTO huggingface dataset:
Patent KR-20020058046-A (KR)
IPC: A61K31/425
Filed: 2000-11-27
Abstract: 본 발명은 하기 화학식 I의 화합물 및 임의의 그의 거울상 이성질체에 관한 것이다. 
     <화학식 I> 
     
       
     
     식 중, 
     R 1 은 수소, 할로겐, C 1 -C 6 -알킬, C 1 -C 6 -알콕시, C 1 -C 6 -할로알킬, 또는 비치환 페닐이거나 C 1 -C 6 -알킬, C 1 -C 6 -할로알킬, C 1 -C 6 -알콕시, 아릴옥시, 할로겐, 시아노 및 니트로로 이루어진 군으로부터 선택되는 치환체에 의해 일치환 내지 오치환된 페닐이며, 이 때 치환체의 개수가 1 초과인 경우 그 치환체들은 서로 동일하거나 상이할 수 있고; 
     R 2 는 수소, C 1 -C 6 -알킬, (C 1 -C 6 -알킬렌)페닐, 피리딜, COOR 6 , CONR 7 R 8 , COR 6 , 알릴 또는 CH 2 -O-R 6 이고; 
     R 3 은 C 1 -C 6 -알킬이고; 
     R 4 는 C 1 -C 6 -알킬, C 1 -C 6 -할로알킬, C 1 -C 6 -알콕시, 아릴옥시, 할로겐, 시아노,히드록시, 아미노 및 니트로로 이루어진 군으로부터 서로 독립적으로 선택되는 각각의 치환체에 의해 치환되거나 비치환된 페닐, 벤질 또는 헤테로시클릴이고, 이 때 치환체의 개수가 1 초과인 경우 그 치환체들은 서로 동일하거나 상이할 수 있고; 
     R 6 은 C 1 -C 6 -알킬, 페닐 또는 벤질이고; 
     R 7 및 R 8 은 서로 독립적으로 수소 또는 C 1 -C 6 -알킬이고; 
     Q는 C 1 -C 6 -알킬렌이고; 
     X 1 은 N 또는 C(CN)이고; 
     X 2 는 N, C(CN), C(COOR 6 ), C(COR 6 ), C(SOR 6 ), C(CONR 7 R 8 ) 또는 C(N0 2 )이고; 
     X 3 및 X 4 는 서로 독립적으로 O 또는 S이고; 
     n은 0 또는 1이다. 
     활성 성분은 살충 특성이 유리하다.  상기 성분은 가축 및 사육 동물의 해충 방제에 특히 적절하다.
Patent KR-20020058053-A (KR)
IPC: C07C39/16
Filed: 2000-11-17
Abstract: 본 발명은 술폰화 가교 폴리스티렌 수지의 존재하에 페놀을 아세톤과 반응시켜 비스페놀을 제조하는 방법의 시운전에 관한 것이다.  본 발명은 a) 최적의 지속 운전 상태에 비해 아세톤 농도는 보다 저하시키고 페놀 농도는 보다 증가시켜 감소된 처리량으로 시운전을 수행하고, b) 지속 운전 상태에 도달할 때까지, 온도를 조절하면서 반응물량 및 반응기 공급물 중의 아세톤 함량을 단계적으로 또는 연속식으로 후속 증가시키는 것을 특징으로 한다.
Patent KR-20020073484-A (KR)
IPC: H01L33/34
Filed: 2000-12-21
Abstract: 마스크(4)를 이용하여, 제1의 III족 질화물계 화합물 반도체층(31)을 점 형상, 스트라이프 형상 또는 격자 형상 등의 아일랜드 상태로 에칭하고, 단차를 형성한다.  이로써, 단차 상단의 상면의 마스크(4)를 제거하지 않고 측면을 핵으로 하여 마스크(4) 상에는 에피택셜 성장하지 않은 제2의 III족 질화물계 화합물 반도체(32)를 세로 방향 및 가로 방향으로 에피택셜 성장시킴으로써 단차 부분을 묻으면서 위쪽으로도 성장시킬 수 있다.  이 때 제 2의 III족 질화물계 화합물 반도체(32)가 가로 방향 에피택셜 성장된 부분의 상부는 III족 질화물계 화합물 반도체층(31)이 가지는 관통 전위의 전파가 억제되고, 묻힌 단차 부분에 관통 전위가 경감된 영역을 만들 수 있다.
Patent KR-20020086924-A (KR)
Title: Impregnated glass fiber strands and products including the same
Inventor: RICE WILLIAM B
IPC: H05K3/00
Filed: 2001-03-16
Abstract: The present invention provides a fabric comprising at least one fiber strand comprising a plurality of fibers and having a resin compatible coating composition on at least a surface of the at least one fiber strand, wherein the at least one fiber strand has an Air Jet Transport Drag Force value of greater than 100,000 gram force per gram mass of strand as determined by a needle air jet nozzle unit having an internal air jet chamber having a diameter of 2 millimeters and a nozzle exit tube having a length of 20 centimeters at a strand feed rate of 274 meters per minute and an air pressure of 310 kiloPascals. The present invetion also provides a reinforced laminate comprising: (a) at least one matrix material; and (b) at least one fabric comprising at least one fiber strand comprising a plurality of fibers and having a resin compatible coating composition on at least a surface of the at least one fiber strand, wherein the at least one fiber strand has an Air Jet Transport Drag Force value of greater than 100,000 gram force per gram mass of strand as determined by a needle air jet nozzle unit having an internal air jet chamber having a diameter of 2 millimeters and a nozzle exit tube having a length of 20 centimeters at a strand feed rate of 274 meters per minute and an air pressure of 310 kiloPascals.
Patent KR-20030003257-A (KR)
IPC: B01J27/055
Filed: 2001-04-25
Abstract: A silver catalyst for ethylene oxidation to ethylene oxide is provided containing a promoter combination consisting of critical amounts of an alkali metal component and a sulfur component, the catalyst being essentially free of rhenium and transition metal components; optionally the catalyst contains a fluorine component.
Patent KR-20030034063-A (KR)
IPC: C21D8/10
Filed: 2001-06-14
Abstract: 시임용접에 의해 용해 또는 변태된 부분이 그렇지 않은 부분과 같은 정도로 높은 관축방향 r값을 구비하여 가공성, 특히 굽힘가공성이 우수한 고가공성 강관 및 그 제조방법을 제공한다.     구체적으로는 시임 부분을 포함하는 원주방향 전체 영역에서 1.2 이상, 보다 바람직하게는 1.6 이상의 길이방향 r값을 갖는 고가공성 강관이다.     이 강관은 띠강을 시임용접하여 이루어지는 강관에, 바람직하게는 Ac 1 온도이상의 가열부여후, 600℃ 이상 또한 Ac 3 이하의 온도영역에서 축경률 30% 이상의 축경압연을 하는 방법, 또는 추가로 이 압연후의 냉각중에, 또는 이 냉각완료후에 재가열하여 600℃ 이상 900℃ 이하에서 1초 이상 유지하는 열처리를 하는 방법에 의해 제조된다.
Patent KR-20030016269-A (KR)
IPC: C07D417/12
Filed: 2001-05-22
Abstract: 본 발명은 화학식 II를 갖는 화합물 및 또한 그 화합물을 포함하는 약학적 조성물, 그들의 제조 공정 및 약에서 화합물의 사용은 물론이고, 사람 11-β-히드록시스테로이드 탈수소효소 타입 1 효소에 작용하는 약제의 제조 공정에 관한 것이다.
Patent KR-20030013435-A (KR)
Title: Clarification Method for Oil Dispersions Comprising Overbased Detergents Containing Calcite
IPC: C10M159/20
Filed: 2001-05-15
Abstract: A hazy dispersion of a calcite-containing sulfonate detergent in oil is clarified by a process including the steps of:a) adding to the dispersion at least one acidifying compound selected from the group consisting of carbon dioxide; sulfur dioxide; organosulfonic acids having a molecular weight of at least 350; and organic carboxylic acids, diacids and anhydrides, containing at least 7 carbon atoms,b) reacting the dispersion in the presence of the acidifying compound, water, and at least one volatile organic solvent, andc) removing volatiles from the so-reacted dispersion by vaporization.
Patent KR-20040067425-A (KR)
Inventor: CHOI GYEONG RAK
IPC: H01H19/14
Filed: 2003-01-23
Abstract: PURPOSE: An assembling structure of a multifunctional switch cancel cam of a vehicle is provided to assemble easily a steering wheel into a cancel cam by using additionally an assembly reference unit. CONSTITUTION: An assembling structure of a multifunctional switch cancel cam of a vehicle includes a body part, a cancel cam, and a steering angle sensor. A multifunctional switch and a wiper switch are installed at a left side and a right side of the body part. A combination projection(210) is projected from the cancel cam(200). The steering angle sensor(300) includes a sensor(310) to sense a rotary angle of a cancel cam. The cancel cam is fixed at a predetermined angle to assembly a steering wheel into the cancel cam before an assembling process of the steering wheel. An assembly reference unit is installed at the cancel cam and the steering angle sensor.
Patent KR-20040070767-A (KR)
Inventor: JUNG YONG HWA
IPC: H01L21/304
Filed: 2003-02-04
Abstract: PURPOSE: A pad conditioner of a semiconductor substrate polishing apparatus is provided to prevent the slurry formed on a polishing pad from remaining by exhausting the slurry to the outside through an exhaust groove. CONSTITUTION: The pad conditioner includes a polishing pad(100) for polishing a semiconductor substrate. A plurality of concentric grooves(110) and a slurry exhausting unit are formed on the polishing pad. The plurality of concentric grooves minimize variation of a compression characteristic and make a flow of the slurry smooth. The slurry exhausting unit exhausts the slurry used in the polishing to the outside.
Patent KR-20030068467-A (KR)
Title: 반도체 집적 회로 장치의 제조 방법
IPC: B29C45/00
Filed: 2003-02-13
Abstract: 제품 품질의 안정화를 도모한다. 
     반도체 집적 회로 장치의 제조에 있어서 매트릭스 프레임에 대하여 수지 몰딩을 행할 때에, 몰드 금형(6)의 하형(8)의 매트릭스 배치의 1열째의 제1 캐비티(8a)와 2열째의 제2 캐비티(8b)에 대하여 각 캐비티 내에 소정 량의 에어(9)를 공급하여 가압하고, 캐비티 내에서의 밀봉용 수지(10)의 충전 속도가 각 캐비티에서 동일하게 되도록 밀봉용 수지(10)를 충전함으로써, 제품 품질의 안정화를 도모할 수 있다.
Patent KR-20040073088-A (KR)
Inventor: KIM YEONG BEOM
IPC: H01J29/76
Filed: 2003-02-13
Abstract: PURPOSE: A CRT including bobbin mounted on convergence yoke is provided to control and compensate a VCR property when manufacturing a deflection yoke or assembling a CRT and the deflection yoke. CONSTITUTION: A CRT including bobbin mounted on convergence yoke comprises an electron gun for emitting electron beams, a screen for displaying light, a shadow mask, a deflection yoke for deflecting the electron beams, and a convergence yoke for compensating miss-convergence. The convergence yoke includes a coil(610) for forming magnetic field to compensate misconvergence; an iron piece(620) for forming quadrupole magnetic field; a bobbin(630) fixed to the iron piece and having a path thereinside; and a compensating core(640) inserted into the path of the bobbin.
Patent KR-20040074334-A (KR)
Inventor: CHOI DO YEONG
IPC: G11B15/44
Filed: 2003-02-17
Abstract: PURPOSE: A loading motor bracket of a tape recorder is provided to form an inner circumference of a bracket body to be relative to an outer circumference of a loading motor, and to form an open portion on the bracket body to easily mount the loading motor, thereby preventing the loading motor from moving by using one pair of the first hook portions. CONSTITUTION: A bracket body(110) comprises a receiving space portion(103) where a loading motor is housed. An open portion(105) is formed at one side of the bracket body(110) to easily mount the loading motor on the bracket body(110). One pair of elastic transformers(105a,105b) are formed at both sides of the open portion(105). A through-hole is formed on a lower side of the bracket body(110) to prevent an interference. In a holder portion(120), a screw hole(121) and the second hook portion(123) are comprised to fix the bracket body(110) to a main deck of a tape recorder. The screw hole(121) firmly fixes the main deck and the holder portion(120) by coupling with screws. Plural projections are formed on a lower side of the holder portion(120) to effectively fix the bracket body(110).
Patent KR-20040074423-A (KR)
Title: Gas concentrator
Inventor: CHO SEONG MUN
IPC: B01D53/047
Filed: 2003-02-18
Abstract: PURPOSE: A gas concentrator is provided which selectively separates the specific gas by applying pressure difference to the adsorbent using selective adsorptivity of an adsorbent for adsorbing a specific gas primarily. CONSTITUTION: The gas concentrator comprises an adsorption bed in which absorbent is contained; and a check valve means connected to an upper part of the adsorption bed and consisted of fitting(1) and rubber valve(2), wherein the rubber valve comprises body part(4) and rubber plate(3), the rubber plate is attached to the edge of an upper part of the body part, wherein the rubber valve is inserted into the fitting, and the fitting is connected to an upper part of the adsorption bed so as to close the check valve means if pressure in the adsorption bed is the same as or less than an external pressure and open the check valve means to obtain a specific gas enriched air by exceeding elastic force of the rubber plate if pressure in the adsorption bed is greater than the external pressure, and wherein the gas concentrator further comprises a pump means so that the gas concentrator is operated at a pressure between vacuum pressure and the atmospheric pressure by the pump means, and a gas supply means connected to the check valve means to inject the enriched gas into a target space after sucking an enriched gas produced when the check valve means is opened.
Patent KR-20040075373-A (KR)
Inventor: HAN MYEONG SIK
IPC: H01L21/265
Filed: 2003-02-20
Abstract: PURPOSE: A method for forming a gate electrode of a semiconductor device is provided to reduce damage of a polysilicon layer by forming a buffer layer on the polysilicon layer. CONSTITUTION: A gate insulating layer(102) and a polysilicon layer(104) are formed on a semiconductor substrate(100) including an active region and a field region. A buffer layer is formed on the polysilicon layer. The polysilicon layer is changed into a conductive polysilicon layer by implanting ions into the polysilicon layer. The buffer layer is removed therefrom. An anti-reflective layer(116) is formed on the conductive polysilicon layer. A gate pattern is formed by etching sequentially the anti-reflective layer, the conductive polysilicon layer, and the gate insulating layer.
Patent KR-20040077292-A (KR)
Inventor: CHO JI WON
IPC: G01R31/06
Filed: 2003-02-28
Abstract: PURPOSE: A structure of a sensor for diagnosing layer short circuit of a rotor of a generator is provided to prevent previously a trouble of the rotor by predicting a state of the layer short circuit of the rotor. CONSTITUTION: A sensor(2) is used for detecting a state of layer short circuit of a rotor wire and generating a voltage waveform signal. A sensor signal measurement unit(3) measures the voltage waveform signal. The sensor is formed with a sensor tip(6) having a coil winding part and a sensor base(7) adhered on a rotor. The coil winding part is covered by rubber. The sensor signal measurement unit is connected to the sensor by using a wire(8). The sensor signal measurement unit is coupled to a boss(9) by using a bolt. A body includes a surge protector(11) for protecting a diagnosis system from an abnormal voltage.
Patent KR-20030081024-A (KR)
Title: Apparatus for processing a lens
IPC: B24B19/03
Filed: 2003-03-14
Abstract: To suppress the increase in the production cost while the time for converting the data of the shape of the lens frame into the data necessary for the processing is decreased. <??>In the apparatus, a holding shaft 41 in a lens unit 4 which can be freely displaced in the vertical direction while a lens 1 is rotated is disposed on the vertical line of a main shaft 51 of a main rotating tool 50. The apparatus has an elevating and lowering unit 3 which can support the lens unit 4 in the vertical direction. The elevating and lowering unit 3 is lowered while the lens unit 4 is supported. After the lens 1 is brought into contact with the main rotating tool 50, the elevating and lowering unit 3 is separated from the lens unit 4 and lowered to a position in the vertical direction decided based on the data of the shape of the lens frame. The processing amount is decided by this position. The processing pressure decided in accordance with the weight of the lens-holding unit is applied to the lens 1 and the processing is conducted. <IMAGE>
Patent KR-20030031101-A (KR)
Inventor: LEE CHEON GON
IPC: A01K97/00
Filed: 2003-04-01
Abstract: PURPOSE: Provided is an SQS electronic fishing system which falls an underwater special camera into underwater and see fishes directly through a color monitor so that it helps to increase enjoyment of fishing. CONSTITUTION: The SQS electronic fishing system comprises the parts of: an emitting electronic fishing hook(19) and an optical cable wire(14) which elevate DC 12V to high voltage; an underwater light control box(15) which is fallen to underwater to shed light on underwater, shake a natural bait and induce neighboring fishes; the color monitor(6) which assists to select the fishes as size; and a fish sensor(16) which senses the fishes to operate a lamp at a sensor communication speaker of the monitor.
Patent KR-20030044939-A (KR)
Inventor: HYUN MOUNG SOO
IPC: A01K13/00
Filed: 2003-03-28
Abstract: PURPOSE: Provided is a washing device for house pets which puts and holds the pets by fixing band and washes with water circulating to the top when the cover is closed. The device washes semi automatically in short period of time and water is not splashed outside. CONSTITUTION: The washing device comprises: a hexahedron main body with the top open and a certain part of which protrudes outside; a water supplying part at a certain part of the main body with a revolving water supply valve(12) which introduces supplied water inside the device; a discharge hole(13) with a packed plug at the bottom of the main body which discharges inside water outside; a safety discharge hole(14) at a certain part of the side fixed in up and down direction, upper part of which has open corrugated pipe so that the length is controlled in up and down direction; a shower hose connector(21), a multi-purpose shower hose(22) and shower equipment(23); and a cover which covers the top of the main body.
Patent KR-20040089990-A (KR)
Title: System for direct transaction/reservation of agricultural products using internet by linking producers with customers
Inventor: KIM KWANG KYUM
Filed: 2003-04-15
Abstract: PURPOSE: A system for direct transaction/reservation of agricultural products using the Internet is provided to enable producers and customers to share a community and perform the direct transaction conveniently by linking the producers with the customers, enable the producers to save a storage cost by delivering the products in the shortest time, and enable the customers to receive the fresh products. CONSTITUTION: Much regional producer information and the information related to production are uploaded to the same site. The customers select/reserve the products by comparing the information, and confirms a production community and a progress. Deposit money to maximize reliability of both sides is deposited in a banking institution for a predetermined time.
Patent KR-20040090867-A (KR)
Inventor: KANG HAN JONG
IPC: G06F17/21
Filed: 2003-04-18
Abstract: PURPOSE: A method for automatically generating an XSL(eXtensible Style Language) style sheet using a gravity layer method is provided to automatically generate the XSL style sheet by sequentially setting a layer grid spacing value and a grid gravity value to the XSL style sheet, and arranging each document object included in an XML(eXtensible Markup Language) document to a proper grid. CONSTITUTION: An XSL editor generates a result tree by receiving a source tree of the XML document from an XML editor. Each document object is recognized as rectangles surrounding the document object. The first layer grids are generated by repeatedly displaying the first virtual vertical/horizontal segment lines to the XSL style sheet. The rectangles are respectively mapped to the first layer grids by using the grid gravity value. The second layer grids are generated by repeatedly displaying the second virtual segment lines quartering the first layer grid. A table including the document object is generated by displaying the grid line of the grid values used in the mapping. The final XSL style sheet is generated by applying the XSL grammar to structure information of the table.
Patent KR-20030093963-A (KR)
IPC: H05B41/392
Filed: 2003-05-20
Abstract: The described DC to AC inverter efficiently controls the amount of electrical power used to drive a cold cathode fluorescent lamp (CCFL) Additionally, during striking of the CCFL, a higher energy initial energy pulse is used. During normal operation, a lower energy pulse is used. <IMAGE>
Patent KR-20040100218-A (KR)
Inventor: JUN GI MAN
IPC: H04L25/49
Filed: 2003-05-22
Abstract: PURPOSE: A high-speed 8bit/10bit encoder/decoder for increasing a data processing speed by applying a two-stage logic synthesis method to a logic gate structure is provided to perform rapidly and stably a processing operation by minimizing processing steps. CONSTITUTION: A 5bit/6bit encoding function block is used for calculating output data of 6 bits having same number of 0 and 1 by using input data of 5 bits. A 3bit/4bit encoding function block is used for calculating output data of 4 bits having same number of 0 and 1 by using input data of 3 bits. A disparity calculation block is used for generating and outputting a disparity(160) in response to an output and a clock of a 8bit/10bit encoding function block.
Patent KR-20040105910-A (KR)
Inventor: LEE YEONG DEUK
IPC: C08L23/06
Filed: 2003-06-10
Abstract: PURPOSE: Provided is a rubber composition for tire sidewalls, which uses a polyethylene-based wax different from wax currently used in tires to improve the appearance of tire and to retard cracking of rubber caused by ozone aging, thereby improving tire quality. CONSTITUTION: The rubber composition for tire sidewalls comprises 2-3 parts by weight of a polyethylene-based wax based on 100 parts by weight of base rubber. Particular examples of the base rubber include natural rubbers, synthetic rubbers and mixed rubbers thereof. The polyethylene-based wax have a molecular weight greater than that of a paraffin wax or microcrystalline wax currently used in tires by two times or more, as well as a broad range of melting points.
Patent KR-20040106774-A (KR)
Inventor: JUN CHANG HYEON
IPC: H04M1/23
Filed: 2003-06-11
Abstract: PURPOSE: A hybrid key input device of a mobile communication terminal and a method therefor are provided to process electromagnetic induction type key input and push type key input in parallel, thereby improving the convenience in key input. CONSTITUTION: A plurality of key input buttons have a plurality of numeral and character keys and a function key on a keypad(100) of a mobile communication terminal, wherein the keys are operated according to a push type input mode. A plurality of electromagnetic induction sensors are installed at the plurality of key input buttons. If the body of a user contacts to the electromagnetic induction sensors, electromagnetically induced key button signals are output to a screen of the mobile communication terminal, and the corresponding signals are recognized by the mobile communication terminal.
Patent KR-20040107052-A (KR)
Inventor: KIM HYEONG SEOK
IPC: H05K3/00
Filed: 2003-06-12
Abstract: PURPOSE: A method is provided to reduce impacts caused due to static electricity, by forming solder masks on a printed circuit board and exposing only a portion of a copper plate corresponding to the solder masks. CONSTITUTION: A method comprises a first step of arranging a plurality of pairs of solder masks(11) on a portion of an upper surface of a printed circuit board, corresponding to an electro-static discharge test position; a second step of exposing the solder masks to light such that a copper plate is exposed; and a third step of forming the entire of a lower surface of the printed circuit board including one of each of pairs of solder masks, into a ground portion, such that static electricity is eliminated when large amount of static electricity is suddenly introduced.
Patent KR-20050000077-A (KR)
Inventor: YOO CHEOL SANG
IPC: B60T13/70
Filed: 2003-06-23
Abstract: PURPOSE: A stop switch for a vehicle is provided to form a guide passage with a sufficient volume and to prevent the inflow of dust or foreign materials by a simple structure without connecting a hose as the air flows into an operating chamber. CONSTITUTION: In a stop switch for a vehicle, a rubber plate(6) is inserted between bodies(5) combined at the side of a housing(2) penetrated with an air-hole(2a). A movable terminal(7) is installed at the rubber plate in an operating chamber(4) formed in the body and a fixed terminal(8) is fixed and disposed in front of the movable terminal. The movable terminal is separated from the fixed terminal by a rebound spring(9). Accordingly, the stop switch flows in or out the air by penetrating the operating chamber and the outside of the body. A step unit(12) is formed at the outer periphery of the body. A first connection groove(22) for coupling with the outside of the body by a connection hole(21) and embedding a filter(15) and a second connection groove(24) for communicating with the operating chamber through a connection hole(23) are arranged at front and rear peripheries. The first and second connection grooves are linked to a guide groove(25) formed along the outer periphery of the step unit. A rubber tube(30) for keeping the first and second connection grooves and the guide groove airtight is disposed at the step unit of the body and inserted and joined in a combining unit(2b) of the housing.
Patent KR-20050003290-A (KR)
Inventor: KIM HEE SANG
IPC: H01L21/322
Filed: 2003-06-30
Abstract: PURPOSE: A method of fabricating a semiconductor device is provided to reduce electric field and increase a retention time by performing an implantation process only in a channel region. CONSTITUTION: A gate oxide layer(220), a gate electrode material, and an interlayer dielectric are sequentially formed on a semiconductor substrate(200) having a predetermined lower structure. A channel part is opened by etching the interlayer dielectric. A channel region(260) is formed by an implantation process. A nitride layer is formed thereon to bury the etched part and a planarization process is performed. The interlayer dielectric is removed by a wet-etch process. A gate is patterned by performing an etch process using the nitride layer as a mask.