baber/WOPTO huggingface dataset:
Patent KR-20000033092-A (KR)
Title: Frequency demodulation apparatus and method
Inventor: HWANG IN JOON
IPC: H03D3/00
Filed: 1998-11-19
Abstract: PURPOSE: A frequency demodulation apparatus and the method thereof are provided to achieve the frequency demodulation by using the approximation of arcsin. Furthermore, the frequency demodulation apparatus for the SECAM(Sequential Couleur Avec Memory or Sequential Color with Memory) color demodulation is provided to achieve the frequency demodulation by using the approximation of arcsin for the color difference signal components transmitted in the SECAM method. CONSTITUTION: A frequency demodulation apparatus consists of a first ADC(Analog to Digital Converter)(10), a first oscillator(12), a multiplication(14), a first LPF(Low Pass Filter)(16), a first de-emphasis part(18), a first frequency differential part(20) and a first gain compensation part(22). The first ADC(10), sampling a frequency-demodulated signal, converts it into a digital signal. The first oscillator(12) outputs a first oscillation signal. The multiplication(14) carries out the multiplication for the sampling value and the oscillation signal. The first frequency differential part(20) outputs the frequency-demodulated digital signal.
Patent KR-20000034197-A (KR)
Title: Method for emulsifying styrene-butadiene-styrene block copolymer
Inventor: KIM YEONG SANG
IPC: C08J3/03
Filed: 1998-11-28
Abstract: PURPOSE: A process for emulsifying a styrene-butadiene-styrene block copolymer is provided which is capable of changing to a plant mix type easily. CONSTITUTION: An emulsifying method of a styrene-butadiene-styrene block copolymer comprises dissolving a styrene-butadiene-styrene block copolymer in a non polar solvent, emulsifying by adding 5 to 10 parts by weight of a mixed emulsifying agent consisting to a rosin salt, a salt of fatty acid, and a salt of oleic acid and 80 to 100 parts by weight of water to 100 parts by weight of the solution, removing the non polar solvent through a vacuum apparatus and concentrating. The emulsion can be applied to a plant mix type with ease while improving a rate of deformation and stability when applied to asphalt.
Patent KR-19990062918-A (KR)
Title: 플러그-인 시스템용 클림프 접촉 장치
IPC: H01R13/11
Filed: 1998-12-09
Abstract: 본 발명은 전선의 벗겨진 단부에 부착되고 접촉부, 전이 영역, 와이어 클림프 및 절연 클림프를 가지는 각진 접촉 챔버를 구비하는 플러그-인 장치용 클림프 접촉 장치에 관한 것이다.
Patent KR-20000039845-A (KR)
Title: Thermoplastic resin composition having good thermal resistance
Inventor: SHIN SEONG KIL
IPC: C08L25/08
Filed: 1998-12-16
Abstract: PURPOSE: A resin composition useful as parts of electric cooker and automobile interior finish is provided which has an improved releasing property, not lowering thermal resistance and fluidity of ABS resin by using a polyethylenic antiadditive. CONSTITUTION: A resin composition comprises 5-50 weight parts of maleic anhydride copolymer(formula 1) comprising 20-55 weight parts of total volume of anhydric maleic acid and N-(substituted) maleimide monomer, 6-10 weight parts of vinylic graft copolymer, 70-0 weight parts of copolymer of aromatic vinyl and cyanated vinyl and 0.5-3 weight parts of a polyethylenic antiadditive having 1,000-10,000 of weight average molecular weight per 100 weight parts of the total composition.
Patent KR-20000041298-A (KR)
Title: Apparatus for buffering audio data in rom system by removing memory jitter
Inventor: KIM HYEON GWON
IPC: G06F12/14
Filed: 1998-12-22
Abstract: PURPOSE: An apparatus for buffering audio data is provided to have a function of removing a memory jitter caused by an optical pickup jump in a read only memory(ROM) system. CONSTITUTION: An apparatus for buffering audio data in a read only memory(ROM) by removing a memory jitter, comprises an eight to fourteen modulation(EFM) demodulator, an error correcting memory(34), a latch(42), an interface(62), a buffer memory(60), and a memory controller(38). The EFM demodulator separates EFM data into the audio data and sub code data. The EFM demodulator responds to synchronous signals detected from the EFM data, and generates record clock signals. The error correcting memory responds to record addresses to store the audio data, and responds to read addresses to read the audio data. The latch is synchronized with the sub code data. The latch latches sub code synchronous signals output from the EFM demodulator, by responding to read clock signals. The interface outputs the latched sub code data and the read audio data, by responding to the latched sub code synchronous signals and the read clock signals. The buffer memory stores the audio data and the sub code data output from the interface. The memory controller outputs the read clock signals generated by dividing system clock signals. The memory controller outputs the record addresses generated by responding to the record clock signals. The memory controller responds to control signals to unify the read addresses with the record addresses, and outputs the addresses.
Patent KR-20000042286-A (KR)
Title: Draining structure of silent base of fully-automated washing machine
Inventor: PARK YONG SEOK
IPC: D06F39/12
Filed: 1998-12-24
Abstract: PURPOSE: A draining structure of a silent base of a fully-automated washing machine is provided to reduce producing cost, to improve working efficiency by removing an overflow hose, and to prevent insulating destruction due to flood. CONSTITUTION: When a flood is occurred while a washing machine is operated, an overflow pipe is placed on a straight line with a flood drainage hole(5) of an overflow hose assembling part(O). The washing water falling via the overflow pipe falls toward the drainage hole of the overflow hose assembling part. A portion of the washing water is directly flowed into the drainage hole and then discharged. The remaining water is dispersed to other area after colliding against the peripheral of the drainage hole. Many hollow holes for drainage(7) and inclined drainage holes(8) are formed on the silent base(4). The dispersed washing water is discharged to the lower part of the washer via the hollow holes and inclined drainage holes. A baffle(9) is formed in vertical around the hollow holes and the inclined drainage holes to prevent splash of water toward an inclined driving part.
Patent KR-20000042870-A (KR)
Title: Forming method of trench of semiconductor device
Inventor: KIM WON IL
IPC: H01L21/76
Filed: 1998-12-28
Abstract: PURPOSE: A method for forming a trench of a semiconductor device is to prevent from oxidizing of an active region of a silicon substrate when an oxidation layer is deposited to form an oxidation layer spacer. CONSTITUTION: A trench forming method comprises the steps of: forming a pad oxidation layer(2) and a pad nitrification layer(3) serially on a silicon substrate(1), applying a photoresist(5) to the pad nitrification layer, and patterning the photoresist; etching the nitrification layer using the patterned photoresist as a mask to expose the pad oxidation layer, and removing the photoresist; depositing a nitrification layer(6) on the former layer, and etching the nitrification layer to form a nitrification layer spacer(7) such that a portion of the silicon substrate between the nitrification layer spacers is secured as an active region on which a trench(9) is formed; depositing an oxidation layer(4) on the former layer, and etching the oxidation layer and the exposed pad oxidation layer to form an oxidation layer spacer(8) and to expose the silicon substrate on which a trench is formed; etching the exposed silicon substrate to form the trench; and removing the oxidation layer spacer and pad oxidation layer under the same.
Patent KR-20000044825-A (KR)
Title: Thin film micromirror array-actuated device module and manufacturing method thereof
Inventor: CHOI YOUNG JUN
IPC: G02F1/015
Filed: 1998-12-30
Abstract: PURPOSE: A manufacturing method for a TMA device module is provided to reduce the TCP contact defect by forming the source pad, gate pad and the common electrode pad in a same height and in a double angle structure. CONSTITUTION: A device comprises a TMA module(1), an insulation substrate(10), a field oxide layer(20), a MOS transistor(40), a low temperature oxide layer(50), a source line(60b), a gate line(60a), a metal layer(60), a source pad(62), a gate pad(64), a pad protection layer(66), a protection layer(70), an actuator(100), and a common electrode pad(310). A manufacturing method comprises a step of forming a driving substrate in which the transistor is installed; a step of forming the actuator and the driving mirror on the driving substrate; a step of forming the common electrode line to be electrically connected with the upper electrode of the actuator; a step of etching pad open area until the source pad, gate pad and the common electrode pad are formed; a step of forming the pad protection layer to protect the source pad, gate pad, and the common electrode pad; and a step of joining the TCP with the exposed source pad, gate pad and the common electrode pad.
Patent KR-20000046657-A (KR)
Title: Elevator speed control apparatus
Inventor: CHOI DON
IPC: B66B1/24
Filed: 1998-12-31
Abstract: PURPOSE: An elevator speed control apparatus is provided to ensure maximum safety of riders and reduce damage on the system while detecting and preventing, independently of an elevator system controller, an overspeed drive of elevator in all range of operation. CONSTITUTION: An apparatus comprises a switching circuit unit(2) for receiving a first speed signal from an elevator system according to an elevator speed pattern, a second speed signal and a switching control signal from a controller(4) and outputting a third speed signal, the controller(4) for receiving a first speed signal from the elevator system, and outputting the second speed signal having a proper speed pattern according to the actual current speed of the elevator and a switching control signal to the switching circuit unit(2), a memory (6) for read/write data according to the request from the controller(4), a counter circuit unit(8) for counting a location information signal input upon operation of elevator and outputting the result to the controller(4), and an input/out unit(10) connected to the controller(4) so as to input/output a variety of signals.
Patent KR-19990067476-A (KR)
Inventor: MILLER STEPHEN
IPC: C10G45/64
Filed: 1996-11-05
Abstract: 본 발명은 저렴한 시약 및 낮춰진 공정 비용으로 비제올라이트성 분자체를 제조하는 방법을 제공한다. 본 발명의 방법은 알루미늄 알콕사이드 및 기타 비용이 더 나가는 시약대신에 수산화 알루미늄과 같은 저 밀도 작은 크기의 수화된 알루미나 입자를 사용하는 것을 포함한다. 바람직한 수화된 알루미나 입자는 1.0 g/cm의 밀도, 약 40 미크론 미만의 평균 입자 크기 및 0.12 중량% 미만의 알카리 함량을 갖는다.
Patent KR-19990072016-A (KR)
Title: 공작물절단가공기
IPC: B23Q15/12
Filed: 1997-10-09
Abstract: 본 발명은 칩 제거에 의한 공작물 절삭 기계, 예컨대 밀링 기계 또는 선반에 관한 것이다.  회전 부재, 즉 커터 헤드(40) 또는 기계화 될 공작물(10)의 밸런스 에러를 검출하기 위해서 센서(60)가 제공된다.  공구(40)와 관련된 공작물(10)의 전진 이송은 밸런스 에러 센서(60) 신호에 의존하여 공구의 밸런스 에러에서 가능한 편차를 보상하는 방식으로 보정된다.  선반의 경우에 공작물의 전진 이송은 회전각의 위치에 따라 및 결정된 밸런스 에러에 따라 조정될 수 있으며, 그 결과 프로세스의 진행 중에 또는 프로세스 직후에 밸런스가 이루어질 수 있다.
Patent KR-19990072036-A (KR)
IPC: F04C2/16
Filed: 1996-07-08
Abstract: PCT No. PCT/CH96/00250 Sec. 371 Date Feb. 8, 1999 Sec. 102(e) Date Feb. 8, 1999 PCT Filed Jul. 8, 1996 PCT Pub. No. WO97/21925 PCT Pub. Date Jun. 19, 1997In prior art designs, single-flight cast double worms with angles of contact >720 DEG  with large balance hollows at both ends and worm lengths of whole multiples of the pitch operate in the medium rotation speed ranges ( DIFFERENCE 3000 min DIFFERENCE 1) without imbalance. The desired use of special uncastable materials and the manufacturing complexity and the necessary dimensional stability even for extreme profile geometries pose additional problems in balancing which are solved by the present invention. Here, it is possible, by varying the angle of contact of the worm and any balance hollows and/or by altering the contour of the worms in the medium engagement region, to reduce the size of the balance hollows, sometimes to "zero", and with the possible use of additional masses. Besides the advantage of simple raw component manufacture, worms balanced in this way also permit the use of special materials and extreme worm geometries for fitting in pumps used in the chemical, medical and food sectors.
Patent KR-19990082089-A (KR)
IPC: F02B25/14
Filed: 1997-11-24
Abstract: A device for optimizing the efficiency of an internal combustion engine of the type having at least one cylinder within which a piston moves. The cylinder receives an air-fuel fresh gas mixture via an intake system or channel incorporating at least one intake valve. From the cylinder, spent gas emerges and is fed to an exhaust pipe via an exhaust system or channel. The channel incorporates at least one exhaust valve. Within one of the channels where the spent gas moves, the gas passage section is adjustable so as to modify the velocity and pressure of the gas flow directed toward the cylinder and exhaust pipe.
Patent KR-20000015854-A (KR)
Title: High yield stereospecific mannosylation
Inventor: SCOTT IAN L
IPC: C07H15/18
Filed: 1997-05-20
Abstract: PURPOSE: Published methodology for the malformation leads to difficulties in driving the reaction to completion, and frequently result in contamination with 1 to 3% of the beta anomer and ortho by-products. CONSTITUTION: Process of malformation begins with an alcohol or phenol along with a protected mannosyl fluoride. The alcohol or phenol is treated with the protected mannosyl fluoride in the presence of a Lewis acid to give the alpha-mannosylated product in high chemical yield and purity.
Patent KR-20000022201-A (KR)
Title: Method for manufacturing a polycabonate
Inventor: KUZE SHIGEKI
IPC: C08G64/30
Filed: 1997-06-19
Abstract: PURPOSE: A method for manufacturing a polycarbonate with high quality is provided to use a phosphorous basic compound and a quaternary phosphonium salt having specific structure, as polymerization catalysts in a molten state. CONSTITUTION: A method for manufacturing a polycarbonate through an ester exchange reaction in a molten state utilizes catalysts composed of a phosphorous-including basic compound and a quaternary phosphonium salt(the quaternary phosphonium is different from a quaternary phosphonium used as the phosphorus-including basic compound), having a radical more than 1 species or 2 species, selected from groups formed with an aryl group and an alkyl group. The phosphorus-including basic compound is the quaternary phosphonium salt with a structure which a carbon atom does not have divergence. The carbon atom is directly combined with a phosphorous atom composing the compound.
Patent KR-19990067765-A (KR)
Title: 타임스위치 및 그 제조방법
IPC: H01H43/10
Filed: 1999-01-07
Abstract: 전자기기의 회로사양의 차이에 대해 약간의 수정만으로 여러가지 회로로의 대응을 가능하게 하여, 생산성의 향상 및 원가의 저렴화에 기여할 수 있는 것을 과제로 한다. 
     이를 해결하기 위해 이 타임스위치는 적어도 회전구동원(M)과, 이 회전구동원(M)의 회전력을 감속하여 전달하는 치차열(13)과, 이 치차열(13)의 회전에 의해 작동하는 캠(12a)(16a)과, 온 또는 오프제어되는 리프스위치(sw1)(sw2)와, 이들 각 구성요소를 수납하는 광체(筐體)를 갖는다.  그리고 회로접속용 단자(t1)등이 마련된 여러종류의 리프접편(s11)등을 준비해둠과 동시에 단자를 공통단자로서 이용할 경우 그 단자와의 사이를 연결하는 연결부재로서 연결용 리프접편을 준비해 둔다.  한편 광체(11)측에는 리프접편(s11∼s22)등에 마련된 단자(t1)등을 광체(11)의 바깥쪽으로 돌출시키기 위한 절개구멍을 소정위치에 마련해 둠과 동시에 각 리프접편 및 연결부재를 고정하기 위한 고정부(20a∼20h)를 미리 정한 소정위치에 마련해 둔다.  그리고 리프접편을 선택적으로 이용하고, 그 리프접편을 소정의 고정부에 고정시킴과 동시에 필요에 따라 연결부재에 의해 소정단자와의 사이를 접속하여 회로의 사양에 대응한 배선을 얻는 것이다.
Patent KR-20000005584-A (KR)
Inventor: GAWANISIDOSIRO
IPC: H01H37/76
Filed: 1999-02-08
Abstract: PURPOSE: Membranous temperature fuse and its manufacturing method is provided to mollify the limitations of the conventional temperature fuse that has possibility to be deformed into smaller regional outline because of surface tension applied on circular board and to have little separating ability. CONSTITUTION: The membranous temperature fuse and its manufacturing method comprises film based on resin, front element of lead conductive materials that has a pair of belt shape and adhered on the film, available alloy piece melting at low temperature connected between the front of the belt-shaped lead conductive materials, flux spread on the available ally piece melting at low temperature, resin cover film located the resin based film, and the clearance between the resin based film, and resin cover film.
Patent KR-20000056849-A (KR)
Inventor: LEE YUN KEUN
IPC: G10L25/84
Filed: 1999-02-26
Abstract: PURPOSE: A method for recognizing voice of an audio device is provided to increase the yield of voice recognition irrespective of peripheral noise by using an adaptive filter. CONSTITUTION: A method for recognizing voice of an audio device includes following steps. At the first step, a voice signal from which a noise signal is removed by adapting the noise signal from the audio signal to the input voice signals from a microphones. At the second step, the voice interval is detected by performing detecting algorithm of voice interval using short period energy, zero crossing rate, and short period mean variation on the received voice signal. At the third step, the voice signal is analyzed to extract characteristics, the characteristics is compared with a reference pattern or probability of reference model is calculated, and the characteristics or the calculated probability is adapted to a recognizer.
Patent KR-20000060242-A (KR)
Inventor: KIM GI DONG
IPC: H05B33/20
Filed: 1999-03-12
Abstract: PURPOSE: An organic electric field luminous element is provided to increase luminous efficiency and radiate green wavelength light by introducing new green light emitting material or a dopant. CONSTITUTION: An organic electric field luminous element includes a luminous layer containing a compound having the structural formula 1. Here, each of R1 and R2 is a carbon ring to connect N to each of benzene ring carbons 1 and 1', respectively. Each of R3 and R4 is composed of one selected from group including alkoxy, allylocyl, alkyl, phenyl, amine group, halogen and hydrogen. The carbon ring R1 and R2 can include 2 to 10 carbon atoms, and R1 and R2 can be saturated and alternatively unsaturated.
Patent KR-19990046039-A (KR)
Title: 실내미니골프
IPC: A63B67/02
Filed: 1999-03-16
Abstract: 본 발명은 골프에 관한 것으로, 보다 상세하게는 매우 간편한 구조로서 실내에서 남녀노소에 관계없이 누구나 즐길 수 있도록 한 실내 미니골프에 관한 것인 바, 
     공을 타격하는 시타부(A), 각종 장애물이 형성된 장애부(B), 홀(6)이 형성된 홀부(C)로 이루어지며, 시타부(A), 장애부(B), 홀부(C)는 각각 베이스판(1) 상에 인조잔디(2)를 결합하며 양측에는 벽면(3)을 형성하고 베이스판(1)은 하측에 높낮이가 서로 다른 받침대(4)를 결합하며, 상기 시타부(A), 장애부(B), 홀부(C)는 개별로 분리제작하여 조립수단으로서 상호 분리, 조립할 수 있게 하여 이들의 결합에 따라 각 코스를 여러 패턴으로 구성할 수 있게 하고, 시타부(A)와 홀부(C) 사이에는, 전코스의 홀부(C)에서 시타부(A)측으로 공을 이송함과 동시에 전코스 홀부(C)의 홀(6)로부터 다음 코스의 시타부(A)로 공을 이송하는 이송관(9)을 배치하여 이들을 각 코스 별로 연결토록 하며, 장애부(B)와 홀부(C)상에는 탈락구(5)를 형성하고 저면에는 탈락구(5)에서 탈락된 공을 회수하기 위한 네트(7)와 회수관(8)을 마련하며, 홀부(C)와 이송관(9)측에는 한 코스를 뛰어넘어 그 다음 코스로 곧장 이동할 수 있는 한단계 뛰어넘기경로를 구비한 것에 요지가 있다.
Patent KR-20000061636-A (KR)
Inventor: OH CHI YEONG
Filed: 1999-03-29
Abstract: PURPOSE: A method for implementing a virtual cashbox is provided to allow only the authorized person to preserve and withdraw the file by using the password and a domestic codification algorithm, to codify the internet transmission data in order to allow access to only the authorized individuals, and to thoroughly secure important information that requires secrecy or security. CONSTITUTION: A method for implementing a virtual cashbox is composed of authentication, transmission, execution, and recovery. The user is authenticated(S100) and the codification or the decoding of the file is performed(S200). The file is executed, transmitted, and stored in a special cashbox(S300, S400, S500). When the user orders for the deletion of file, the secure delete process is executed for complete deletion of the file(S600). If a file has not been accessed for a certain time, automatic lock-up process is executed(S700). When the password is lost or forgotten, the password is recovered through a special file that stores Password Analogy Sentence/Word(S800).
Patent KR-19990078394-A (KR)
Title: 감압접착제및표면보호재
IPC: C09J11/06
Filed: 1999-03-30
Abstract: 초기 접착력 및 이의 유지성과 내후성과의 균형이 우수하여 장기 접착 후에도 풀이 남지 않아 용이하게 재박리할 수 있는 폴리이소부틸렌계 감압 접착제 및 이를 사용한 표면 보호재의 개발을 목적으로 하며, 본 발명에서는, 유기용매 속에서 라디칼 발생제로 소련처리한 이소부틸렌계 중합체와 분자량이 90 내지 300이고 산소원자 함유율이 8.5% 이상인 알콜 또는 이의 유도체 또는 분자량이 70 내지 400이고 산소원자 함유율이 11% 이상인 카복실산 또는 이의 유도체로 이루어진 박리 제어제를 적어도 성분으로 하고, 박리 제어제를 이소부틸렌계 중합체 100중량부당 0.001 내지 5중량부 함유하는 감압 접착제 및 이로 이루어진 감압 접착층을 지지 기재 위에 갖는 표면 보호재로 하였다. 
     이소부틸렌계 감압 접착층의 접착 계면 부근에 박리 제어제가 편재되어 응집력이 약한 층이 형성되어, 초기 접착력 및 이의 유지성과 내후성이 우수한 감압 접착층을 수득할 수 있다.
Patent KR-20000061715-A (KR)
Inventor: SEO KWANG SEOK
IPC: C08J7/04
Filed: 1999-03-30
Abstract: PURPOSE: A film for preventing static electricity which is able to keep static electricity preventing property of the film and improve light-permeability of the film for preventing static electricity by improving a degree of permeation of a visible ray through the film and also make static electricity preventing products with various surface physical properties by changing the physical properties of a protecting layer according to materials of the protecting layer and a method for preparing the same are provided. CONSTITUTION: The film for preventing static electricity comprises: (i) a conductive layer which is formed by coating the surface of the base plate with conductive substances; and (ii) a protecting layer which is formed by coating the surface of the conductive layer with insulating high molecule in a thickness of not losing the surface conductivity of the final product. The method comprises steps of: (i) coating the surface of the base plate with a conductive material to foam a conductive film; and (ii) coating the surface of the conductive film with an insulating high molecule.
Patent KR-20000061980-A (KR)
Inventor: KIM JAE WOON
IPC: C04B33/00
Filed: 1999-03-31
Abstract: PURPOSE: A process for producing miracle clay is provided, which eliminates a toxic matter from natural mineral ores such as macbanseok by using non-toxic natural clay. CONSTITUTION: The process for producing the miracle clay comprises the steps of: (A) mixing the natural mineral ores such as macbanseok and ocher in the weight ratio of 2:8 and mixing the resultant mixture and mica in the weight ratio of 9:1 and then steaming the mixture at 70-95°C for 10-30 min. and sintering the steamed mixture at 1000-1350°C for 120-240 min. followed by pulverizing the sintered mixture to form powder of 400-650 mesh; (B) mixing an activated carbon and an activated clay in the volume ratio of 1:9 and maturing the mixture at 30-80°C for 120-260 min. and then mixing diatomaceous earth and the mica in the weight ratio of 4:6, and mixing the mixture of the diatomaceous earth and the mica and the matured mixture in the weigh ratio of 8:2, followed by stirring the mixture; mixing the mixture(A) and the mixture(B) in the weight ratio of 2:8; drying the mixture at 70-120°C for 120-240 min.
Patent KR-20000066243-A (KR)
Inventor: YOO HEON HYUNG
IPC: A42B1/00
Filed: 1999-04-14
Abstract: PURPOSE: A cap for shielding electromagnetic wave is provided to protect a brain area from harm of the electromagnetic wave generated by computer, cellular phone, mobile phone, beeper, wireless communicating devices, microwave oven, TV, electronics, etc. CONSTITUTION: A cap for shielding electromagnetic wave is manufactured by inserting conductive metal net woven metal fabrics between the outside cloth(11) and the inside cloth(13) of the cap. The shielding materials(12) of the electromagnetic wave are copper and nickel. In addition to the materials, aluminium, brass and steel are contained to the metal net. A diameter of the shielding materials(12) is in the range of 0.01-0.1mm and the net mesh is 50-300 mesh/inch. The shielding effect of 200 mesh/inch covers several hundred MHz frequency up to 80dB or several GHz frequency up to 40dB. An ear covering(14) is foldable and attached to the cap for using a cellular phone or mobile phone.