baber/WOPTO huggingface dataset:
Patent KR-20010030344-A (KR)
Title: A universal magnetic stripe card
Inventor: INFOSINO WILLIAM J
IPC: G07F7/10
Filed: 2000-09-08
Abstract: PURPOSE: A universal magnetic stripe card is provided to enable a user to transform into a credit card, ATM card, employee access card, and other magnetic-stripe card. CONSTITUTION: A credit card sized universal card that a user may transform at will into a credit card, ATM card, employee access card, and any other conventional magnetic-stripe type card. To prevent the card from being used by anyone other than its owner, a security test may be presented each time the user tries to transform the universal card. The security test may involve, for example, electronically comparing the user's fingerprint with the owner's fingerprint. A database may be generated containing the fingerprints of the owners of universal cards.
Patent KR-20020020396-A (KR)
Title: A Method for HTML to xHTML Conversion and Tranmission in Mobile Communication Circumstances
Inventor: SEO EUN JU
IPC: G06F17/00
Filed: 2000-09-08
Abstract: PURPOSE: A method for converting and transmitting an HTML document into an xHTML(extensible HTML) document is provided to convert an HTML document into an xHTML document, in the case of using the Internet with a wireless terminal, to segment the converted data in accordance with the throughput of the wireless terminal or a gateway, and to transmit them. CONSTITUTION: A wireless terminal user requests access to a desired web site(100), a web server receives the URL(Uniform Resource Locator) of the requested web site(110). Then the web server brings the requested web site's HTML document and converts the HTML document into an xHTML document so as to be displayed through the user's wireless terminal(130). Then the web server segments the xHTML document so that a gateway or the wireless terminal can suitably process the document(140). The segmented documents are transmitted to the user's wireless terminal(150), and finally the xHTML document is displayed on the screen of the wireless terminal(160).
Patent KR-20020023610-A (KR)
Inventor: KIM JONG WON
IPC: B23K35/368
Filed: 2000-09-23
Abstract: PURPOSE: A flux cored wire for gas shield arc welding is provided which has superior all position weldability, particularly obtains convenience of upward welding, and simultaneously enables high speed horizontal filet welding and the formation of superior bead shape. CONSTITUTION: The flux cored wire for gas shield arc welding comprises 3.0 to 8.0 wt.% of Ti and Ti oxide as a TiO2 converted value, 0.5 to 2.0 wt.% of Si and Si oxide as a SiO2 converted value, 1.5 to 3.5 wt.% of metal Mn and alloy as a Mn converted value, 0.02 to 0.10 wt.% of C, 0.5 to 1.5 wt.% of Mg and Mg oxide as a MgO converted value, 0.2 wt.% or less of a sum of Na2O and K2O compounds, 0.1 to 0.5 wt.% of Zr and Zr oxide as a ZrO2 converted value and 0.2 to 0.8 wt.% of Al and Al oxide as an Al2O3 converted value based on the total weight of the wire, and is composed in the composition range satisfying the following Mathematical Expressions:£Mathematical Expression 1|£Mathematical Expression 2|.
Patent KR-20010076208-A (KR)
Title: Preparation of zeolite
Inventor: HAMADA HIDEAKI
IPC: C01B39/48
Filed: 2000-09-27
Abstract: PURPOSE: To provide a simple method of synthesizing a zeolite such as £A1|-SSZ-31 zeolite good in purity. CONSTITUTION: A zeolite is synthesized by drying a mixture of a zeolite raw material with an aluminum-containing substance, an organic template (preferably N,N,N,N',N',N'-hexaethyl-1,6-diazoniahexane dihydroxide or its salt) and water, providing a powdery dry gel, reacting the resultant dry gel while bringing the dry gel into contact with saturated steam and synthesizing the £A1|-SSZ-31. Furthermore, the N,N,N,N',N',N'-hexaethyl-1,6-diazoniahexane dihydroxide or its salt is used as the organic template to synthesize the zeolite.
Patent KR-20020028293-A (KR)
Title: chestnut and sweet potato roast time capsule
Inventor: KIM CHUNG BOO
IPC: F24C7/08
Filed: 2000-10-09
Abstract: PURPOSE: A time capsule for roasting a sweet potato and a chestnut is provided to prevent loss of taste and nutrition by forming a timer and to minimize loss of heat. CONSTITUTION: An electric plug is formed on a front upper portion of a time capsule. A timer is installed on a rear portion of the time capsule. A cylinder is mounted between the lower portion of the timer and the plug. A heater is formed as U shape or a spring shape by being arranged on the cylinder. The heater has a space for inserting a cylinder shaped pipe. A cover is installed on a lower portion of the heater. An air hole is formed in the middle of the cover. The cylinder shaped time capsule conveniently roasts a sweet potato and a chestnut by removing pneumatic pressure generated in roasting. Thereby, the time capsule for roasting the sweet potato and the chestnut minimizes loss of heat by forming the time capsule as the cylinder shape.
Patent KR-20020030204-A (KR)
Title: Crash pad fixing bracket for vehicle
Inventor: LIM BYEONG CHEOL
IPC: B62D25/08
Filed: 2000-10-16
Abstract: PURPOSE: A crash pad fixing bracket of a vehicle is provided to use a supporting bar of a crash pad fixing bracket with a variable length according to an entire width of a vehicle, thereby using a single supporting bar for various vehicles compatibly. CONSTITUTION: A crash pad fixing bracket of a vehicle includes a supporting bar(10) positioned at a lower end of a shield glass or an instrument panel and formed in the hollow pipe shape of a predetermined width for fixing a crash pad to a vehicle body, a fixing plate formed at both sides of the supporting bar to be fixed to a pillar, and a supporting plate formed in the center on a bottom surface of the supporting bar to be fixed to the vehicle body, and a length control element(40) formed at a predetermined position of the supporting bar for varying the length of the supporting bar according to the entire width of the vehicle.
Patent KR-20010000743-A (KR)
Inventor: LEE HYE JIN
IPC: A23L2/00
Filed: 2000-10-17
Abstract: PURPOSE: A health drink composition for pregnant woman containing calcium, red beet helping blood production and bowel movement, DHA (Docosahexaenoic acid) and taurine with enriched Vitamin D3 and C is provided to improve physical health of the woman and prevent gestosis and complications. CONSTITUTION: The drink composition is produced by the following steps: (i) getting a basic drink solution by adding 0.05wt% of water-soluble calcium, 0.15wt% of taurine, 0.02wt% of Vitamin D3 and C, 4.0wt% of Oligosaccharide, 3.0wt% of liquid fructose, and 0.04wt% of citric acid to refined water; (ii) mixing 10ml of DHA with 3g of β -Cyclodextrin and 500ml of refined water and centrifuging the clear mixture; (iii) stirring the basic drink solution, 0.4wt% of red beet juice and 0.3wt% of the clear mixture together with 0.2wt% of a fruit flavor mix and refined water for 30-40min; and then (iv) instant pasteurizing the last mixed solution at 87-95 deg.C and filling up, sealing and freezing.
Patent KR-20020031484-A (KR)
Title: Sludge Remove Apparatus of Settling Basin Weir
Inventor: KIM DONG U
IPC: B01D21/18
Filed: 2000-10-20
Abstract: PURPOSE: An algae removing equipment of settling tank is provided, which can selectively and automatically remove algae attached to weir of settling tank, thus keeping water path of supernatant at normal state and prevent algae from attaching to the weir wall in advance. CONSTITUTION: The system comprises an algae removing device(10) and an algae collecting device(20), all of which are fixed to a supporting frame(7) that is connected to platform(5) driven by a driving motor(6). To the both sides of weir(2), brushes(19a), which are spring connected by a moving member(17) to push forward by downward pushing of wedge(14) and rotate along the guide wheel(8) that move around the tank side, scratch the weir wall to clean algae. The downward moving of wedge(14) is made by a lifting member connected to a fixing member(11). The floating algae on the water surface is collected by algae collecting device(20) and mixed with coagulant at a ball screw(22) and discharged.
Patent KR-20020039986-A (KR)
Title: Vulcanizing mold for tire bladder
Inventor: JANG IN SEOK
IPC: B29C35/02
Filed: 2000-11-23
Abstract: PURPOSE: A bladder curing mold is provided to expand the life span of a bladder by uniformly forming a gauge of the bladder and to remove burrs from the bladder by improving the structure of a core mold. CONSTITUTION: A core mold(1) is provided to form an inner portion of a bladder(3). An outer mold is provided to form an outer portion of the bladder(3). A core adapter(10) is installed at an upper portion of the core mold(1) so as to form a coupling end(30) of the bladder(3). An end(11) of the core adapter(10) is positioned at a front of the coupling end(30) of the bladder(3). A parting section is formed by inclining the core mold(1) and the core adapter(10). Rubber solution is introduced into a space formed between the outer mold and the core mold(1) so as to form the bladder(3). At this time, the parting section formed between the core mold(1) and the core adapter(10) is positioned at the front of the coupling end(30), so the burrs are not formed in the bladder(3).
Patent KR-20020041618-A (KR)
Title: very small friction and wear tester
Inventor: AHN HYO SEOK
IPC: G01N3/56
Filed: 2000-11-28
Abstract: PURPOSE: A fine frictional wear test apparatus is provided to finely adjust the sliding distance and continuously control the size and reciprocation cycle of load, while achieving improved reliability for the test result. CONSTITUTION: An apparatus comprises a work table(4) having a flat plate sample(1) fixed onto the work table; a first drive unit(3) for moving the work table in a horizontal direction; a support board(6) disposed above the work table, and which has a ball sample(2) fixed at the lower surface of the support board; a first sensor(8) for sensing the horizontal displacement of the flat panel sample; a second driving unit for applying a predetermined load to the flat panel sample by the ball sample by pulling a load flat plate(7a), a second sensor(9) for sensing the displacement of the ball sample; a third sensor(10) for sensing the horizontal displacement of the ball sample; a fourth sensor(11) for sensing the vertical displacement of the ball sample; a control unit for operating the first and second driving units in accordance with a preset value, and calculating the displacement sensed by the sensors; and a display unit for displaying, in a real time basis, the frictional wear characteristics of the samples calculated by the control unit.
Patent KR-20010016355-A (KR)
Title: A joint pipe for prevention of noise
Inventor: KIM YONG AN
IPC: F16L23/00
Filed: 2000-12-05
Abstract: PURPOSE: A noise prevention connecting pipe is provided to improve productivity by making installation easy, to realize the quality of a product by reducing a defect ratio, and to be applied to connecting pipes of various shapes. CONSTITUTION: A connecting pipe(20) is composed of a fluid inlet port, a fluid discharge port, and a fastening nut(29) combined to the inlet port and the outlet port and for fastening the bores of the inlet port and the discharge port. A left cover unit(10a) with a left contact portion(11a) and a right cover unit(10b) with a right contact portion(11b) are installed on the rear face of the connecting pipe symmetric to each other. Herein, a compartment(17) is formed by the left and right cover units surrounding the connecting pipe. The noise caused by the bumping of a fluid against the inner wall of the connecting pipe is absorbed in the compartment. As both ends of a cover composed of the left and right cover units are firmly adhered to the connecting pipe by an adhesive agent, the body of the connecting pipe is completely isolated from the outside without a gap. Therefore, the leakage of noise is reduced.
Patent KR-20020046553-A (KR)
Title: A method of optimal cutting for bad wire
Inventor: KIM JEONG HWAN
IPC: B26D5/38
Filed: 2000-12-15
Abstract: PURPOSE: A method for cutting a bad tip of wire materials is provided to increase yield rate of wire materials by simplifying a cutter for bad tip of the materials even without installing a light projector and a light receiver. CONSTITUTION: A front light detector(4) for an opening(2') of a front guide(2) and a rear light detector(5) for an opening(3') of a rear guide(3) are installed to detect progressing of the wire materials by light generated from hot wire materials when a leading portion of wire materials is progressed. The progressing time for progressing distance is monitored by a time calculator(6). On the base of the calculated time, corresponding time from the rear guide to a cutter(8) is calculated. Corresponding signal is transferred to the cutter through a cutter controller(7), operating the cutter as to remove a bad portion in the leading portion of the wire materials.
Patent KR-20020048063-A (KR)
Title: Assist grip of an automobile
Inventor: RYU JUN YEOL
IPC: B60N3/02
Filed: 2000-12-15
Abstract: PURPOSE: An assistant grip of a vehicle is provided to stabilize the stance of an occupant during a travel by moving and rotating a grip body depending on the body and sitting position of the occupant. CONSTITUTION: An assistant grip of a vehicle comprises a guider(100) having a shaft(110), placing surfaces(120) and a fixing surface(130), a grip body(200) installed sliding along a guide groove(131), and a displacement preventing unit to prevent the displacement of the grip body while the grip body is pushed outward. The grip body is moved forward and backward depending on the figure of the body or the position of a seat. Upon pushing the grip body, a placing piece(320) of a leaf spring(300) is placed on the placing surface of the guider. Therefore, an occupant is kept in the stable stance.
Patent KR-20020048514-A (KR)
Title: Vetical Brinder with Following the sun device
Inventor: HN DOO SUNG
IPC: E06B9/36
Filed: 2000-12-18
Abstract: PURPOSE: A controller for vertical blinds using location tracer of the sun is provided to rotate the vertical blinds according to the location of the sun automatically. CONSTITUTION: The controller for vertical blinds using location tracer of the sun comprises a solar sensor case having a hole to increase an efficiency, wherein the case is arranged in a fan shape to recognize a location of the sun; and location tracer of the sun using the sensor case and a micro processor(11). After the solar location is grasped, the vertical blinds are rotated to a predetermined position by a motor control circuit(10) and a motor according to an internal program.
Patent KR-20020050640-A (KR)
Title: Device for measuring the ejection angle of a fuel nozzle
Inventor: LEE HAE UK
IPC: G01M99/00
Filed: 2000-12-21
Abstract: PURPOSE: An apparatus is provided to achieve improved engine performance and increased durability of engine by measuring fuel injection angle of fuel nozzle in a convenient manner. CONSTITUTION: An apparatus comprises a nozzle holder jig for accommodating a nozzle holder mounted with a nozzle for fuel injection; a bed(c) where the nozzle holder is mounted in a vertical direction through the nozzle holder jig, wherein the bed has an end rotating centering from the other end of the bed; an elevating section(b) connected, through a rotating shaft(d), to the other end of the bed serving as a rotation center; a bed rotation control section(g) mounted to the end of the bed connected to the elevating section, and which controls rotation amount of the bed; a support section(a) having elevation grooves(e) formed inside of both ends of the support section so as to accommodate both ends of the elevating section, and a return hole(4) formed at the center of the lower end of the support section so as to collect the fuel injected from injection ports of the nozzle; a first protractor attached to the side surface of the support section, and which measures rotating angle of the bed; a second protractor(3) attached to the side surface of the support section where injection ports of the nozzle are located; a base(6) having a convey path for conveying the fuel collected through the return hole formed at the support section; a pump(2) for feeding fuel to the nozzle, and re-feeding fuel through the covey path formed at the base; and a fuel pipe(5) for interconnecting the pump and the nozzle so as to supply fuel.
Patent KR-20020051756-A (KR)
Title: An automotive battery having a snap typed connecting means
Inventor: LEE JONG HEON
IPC: H01M2/10
Filed: 2000-12-23
Abstract: PURPOSE: Provided is a snap type connection member of a battery for a vehicle, which can connect a cable to a terminal of the battery by pressing, therefore assembling and separating are easy. CONSTITUTION: The snap type connection member is characterized in that a fixing member(10) comprises a supporting plate(11) for pressing a cable, a supporting device(12) formed on the lower part of the supporting plate(11) as one body and inserted and coupled into a connection cavity(1a) formed on the terminal(1) of the battery(B), and a withdrawing device(13) formed on the lower part of the supporting plate(11) as one body and projected to hold it with hands or tools. The supporting device(12) has a cross form and is made of a soft material. And the withdrawing device(13) has a circular inserting groove(13a) for inserting a rod(R), used for the separation from the connection cavity(1a), therein.
Patent KR-20020056584-A (KR)
Title: A LPG vehicle having an pressure sustained fuel tank
Inventor: CHO WON BONG
IPC: B60K15/07
Filed: 2000-12-29
Abstract: PURPOSE: An LPG car having a pressure maintaining fuel tank is provided to always maintain the optimum fuel discharge pressure by pressurizing LPG inside the fuel tank through an air valve when temperature around the fuel tank is lowered less than a predetermined temperature. CONSTITUTION: An LPG car having a pressure maintaining fuel tank includes an air chamber and a pressurizing part for pressurizing fuel when fuel pressure of a fuel tank is lowered. The pressurizing part has a diaphragm(11) moving laterally according to air pressure inside the tank, a support plate(12), and an air valve(13). The support plate is located at an interval from the diaphragm, supports the diaphragm, and has a number of holes(12-1). The air valve restricts introduction of the air and discharges moisture generated inside the tank.
Patent KR-20020058892-A (KR)
Title: A driving mode control method of gasolin direct injection engin
Inventor: KIM WON TAE
IPC: F02D41/02
Filed: 2000-12-30
Abstract: PURPOSE: An abrupt change of engine torque in transferring control of driving mode of a gasoline direct injection engine is prevented, thereby improving drivability. CONSTITUTION: In a gasoline direct injection engine having driving mode of early homogeneous mode(EHM), early stratified mode(ESM), and late stratified mode(LSM), a first transferring control is started from above driving mode to a lean air fuel ratio of relative small fuel amount. It is decided whether a corresponding output value of next driving mode is same with a measured output value concerning to opening degree of an exhaust gas recirculation valve or an intake flow control valve. If then, an electronic signal is changed to change the driving mode.
Patent KR-20010022772-A (KR)
Title: An indicating device, specially in a vehicle
IPC: G01P1/08
Filed: 1998-08-11
Abstract: An indicating device in a vehicle that supplies complementary information to the driver of the vehicle. The device is provided with at least one scale for displaying basic information on an index disc. The index disc includes indicators arranged in close connection with and in relation to individual indexes of the scale and arranged as individually controllable light sources for indicating complementary information, which is relatable to the scale. The scale is arranged so that the basic information includes the vehicle speed and the complementary information of a relative speed to a vehicle in front.
Patent KR-20010022939-A (KR)
Title: 자기기록장치
IPC: G11B33/12
Filed: 1999-06-16
Abstract: 자기기록장치 (1) 의 케이스 (4) 의 내부에는 프레임 플레이트 (19) 가 장착되며, 이 프레임 플레이트 (19) 에 디스크 구동모터 및 헤드체 (5) 가 부착되어 있다.     케이스 (4) 와 프레임 플레이트 (19) 사이에는 케이스의 변형을 방지하기 위한 부재 (88) 가 설치되며, 이 부재 (88) 는 카트리지 (2) 가 장전되어 있지 않을 때에는 스프링에 의해 카트리지 통과영역에 놓이고, 카트리지 (2) 가 전진하면 그 카트리지 (2) 의 전단에 밀려서 카트리지 통과영역외로 퇴피된다.
Patent KR-20010024168-A (KR)
Title: 유료 시청 프로그램 액세스 제어 시스템
IPC: H04N7/173
Filed: 1998-09-23
Abstract: 본 발명의 유료 시청 프로그램 액세스 제어 시스템은 텔레비전 신호를 전화 제어신호와 결합하여 원격 위치한 전화 접속부로 하여금 단일의 회선 또는 송신 회선을 통해 텔레비전 수신기에 연결되도록 한다.  상기 텔레비전 신호는 텔코 변조기(12)에서 상기 전화 제어 신호와 결합하고, 결합된 신호들은 분리기(14)에 의해 원격 위치에서 분리된다.  일단, 신호들이 분리되고 나면, 상기 텔레비전 신호와 상기 전화 제어 신호는, 마치 상기 원격 위치로 별도로 송신된 것처럼 사용될 수 있다.
Patent KR-20010030642-A (KR)
Title: 고속 직렬 데이터 통신시스템
IPC: H04L29/02
Filed: 1999-07-07
Abstract: 직렬 통신 시스템(100)은 각 제 1 신호(130) 및 제 2 신호(140)를 송신 회로(110)로부터 각 병렬 신호 캐리어를 통해 수신 회로(120)로 전송하기 위한 통신 매체를 포함한다.  클럭 신호(150)와 동기하여, 송신 회로(110)는 제 1 신호(130) 및 제 2 신호(140)로서 데이터 메시지의 클럭 신호(150) 및 데이터 비트(들)(160)의 조합을 직렬로 나타낸다.  데이터 비트 경계에서, 송신 회로(110)는 전송할 데이터 비트가 제 1 값을 가지는 경우에 제 1 신호의 천이를 초래하고, 데이터 비트가 상이한 제 2 값을 가지는 경우에 제 2 신호(140)의 천이를 초래한다.  수신 회로(120)는 예를 들어, XOR 함수를 사용하여 제 1 신호(130) 및 제 2 신호(140)의 신호 천이를 검출 및 조합하므로써 클럭 신호를 복구하고, 제 1 신호(130) 및/또는 제 2 신호(140)로부터 데이터 메시지를 복구하기 위한 수단을 포함한다.
Patent KR-20010031559-A (KR)
Title: 과산화수소 및 촉매를 사용하여 페닐렌디아민으로부터퀴논디이민을 제조하는 방법
IPC: C07C249/02
Filed: 1998-10-27
Abstract: 본 발명은 촉매의 존재하에서 과산화수소를 사용하여 퀴논디이민을 그의 대응하는 페닐렌디아민으로부터 제조하는 방법에 관한 것으로서, 
     페닐렌디아민 화합물은 촉매의 존재하에서 페닐렌디아민을 과산화수소와 반응시킴으로써 그의 대응하는 퀴논디이민으로 높은 선택도를 가지고 전환될 수 있는 것을 특징으로 한다.
Patent KR-20010041101-A (KR)
IPC: H04H20/00
Filed: 1998-12-21
Abstract: 본 발명은 다수 채널의 데이터가 다중되어 있는 방송을 수신하는 수신기에 있어서, 보다 고품위 혹은 보다 다양한 서비스를 행하고 있는 비트율이 높은 채널을 오토 프리세트하는 것을 기술적 과제로 하며, 비트율이 다른 복수 채널의 데이터가 시분할 다중된 신호를 수신하는 디지털 방송 수신기에 있어서, 상기 시분할 다중된 신호로부터 특정한 채널의 데이터를 추출하는 데이터 추출 수단과, 상기 채널의 비트율을 검출하는 비트율 검출 수단과, 수신 채널 정보를 기억하는 프리세트 메모리를 포함하고, 비트율 검출 수단에 의해 검출되는 비트율 값에 의해 채널 정보를 프리세트 메모리에 저장한다.  그리고, 데이터 추출 수단은 상기 저장된 채널 정보에 의해 특정되는 채널의 데이터를 추출함으로써 선국을 행한다.
Patent KR-20010042512-A (KR)
IPC: A61K31/715
Filed: 1999-03-17
Abstract: The invention concerns an ophthalmic composition comprising a beta-blocker solution, said composition being obtained by dissolving in water beta-blocker in the presence of alginic acid and adding an alkaline base, to obtain a solution with the PH of 6 to 8. Said composition has a sustained duration of action.
Patent KR-20010052954-A (KR)
Title: 내충격성 아크릴계 중합체 펠렛 및 그의 제조 방법
IPC: C08L33/08
Filed: 1998-06-17
Abstract: 내층으로서 하나 이상의 고무상 탄성체층 (α)을 가지며 최외층으로서 메틸메타크릴레이트를 주성분으로 하는 경질 중합체층 (β)을 갖는 아크릴계 다층 구조 중합체를 포함하여 이루어지고, 고무상 탄성체층 (α)을 포함하는 아세톤 불용부의 함량이 펠렛 단위 중량 당 70 내지 97 중량%인 내충격성 아크릴계 중합체 펠렛 및 그의 제조 방법이 개시되어 있다.  이 펠렛은 취급성이 우수하고, 동시에 고무상 탄성체의 함량이 많다.
Patent KR-20010088309-A (KR)
Inventor: AGATA KENICHI
IPC: G06F21/60
Filed: 2001-01-04
Abstract: PURPOSE: A general purpose computer is provided to store data protected by CONSTITUTION: An HDD(67) as the internal storage means of the general purpose computer holds the data such as music data protected by the
Patent KR-20010077978-A (KR)
Inventor: HANLEY JONATHAN P
IPC: B01F23/10
Filed: 2001-01-12
Abstract: PURPOSE: A gas mixing apparatus is provided to accurately mix a plurality of gases, to reduce defects such as tombstoning and solder splatter, and to improve soldering performance in the manufacture of a circuit board. CONSTITUTION: The compact gas mixing apparatus comprises a gas panel, pressure control valves(16,18) to regulate differential pressures, flow meters(30,32) and a static mixing chamber(34). The plurality of gases may be a minor gas and a major gas, where, for example, the major gas is nitrogen, and the minor gas is air or oxygen. The major gas and the minor gas is preferably mixed in a proportion of from about 100ppm to about 10,000ppm minor gas in the major gas, more preferably in a proportion of from about 500ppm to about 2,000ppm minor gas in the major gas.