baber/WOPTO huggingface dataset:
Patent KR-810001809-B1 (KR)
Title: Picture display tube
Inventor: IJZEREN A
IPC: H01J29/92
Filed: 1977-10-04
Granted: 1981-11-14
Abstract: The picture display tube includes an electrode system(4) generating an electron beam directed to a display screen(8).  An electrically conductive layer(13) extends between the screen and the electrode system over the envelope inner surface.  A resistive layer(14) is situated near the electrode system.  A high voltage contact(15) in the envelope between the screen and electrode system is connected to the conductive layer.  A getter(18) is mounted on a resilient metal connection strip(19) detachable held in the envelope by a pin and slot connection.  The pin projects internally from the tube wall and having an enlarged head and neck.
Patent KR-830000268-B1 (KR)
Title: Luminance control circuit for a television receiver
Inventor: OKADA TAKASHI
Filed: 1979-11-15
Granted: 1983-02-25
Abstract: The luminance control cct. for a television receiver produces a control signal is response to a video signal exceeding an end of the dynamic range of a cathode ray tube. Gain control ccts.(10)(12) in the path of the video signal to the cathode ray tube adjust their gain in response to the control signal to maintain the video signal within the dynamic range of the cathode ray tube. The end of the dynamic range at which the video signal may be controlled includes one or both of the white peak and black levels. The control signal may also be responsive to an average cathode ray tube beam current exceeding a predetd. value.
Patent KR-840000108-B1 (KR)
Title: A method of weaving tubular fabrics
Inventor: TORRI SOICHI
IPC: D03D37/00
Filed: 1979-12-24
Granted: 1984-02-11
Abstract: This invention is about the method of weaving tubular fabrics.  circular loom shuttles have upwardly and/or downwardly displaced tips so as to deviate in the upward or downward direction any warps lying on the center line of the sheds. By the use of healds allowing selected warps to remain on the shed center line, the shuttle cause pattern weaving,e.g. in forming nonslip weave patterns for grain, fertilizer etc. bags.
Patent KR-840000580-B1 (KR)
Title: Fiber aggregates
Inventor: TESCH GUENTER
IPC: D04H1/46
Filed: 1980-01-07
Granted: 1984-04-23
Abstract: Filaments of min. diam. 3mm end min. length 15mm are intermingled to produce slender, long spherical aggregates whose density is 0.01-0.1 g/cm3.  In needle processing of them needles pass through the aggregates without any resistance, gripping and withdrawing.  Pulled length of the aggregates can be extended without losing their special cohesiveness.
Patent KR-840000665-B1 (KR)
Title: Optical reading system
Inventor: MCMILLIN JOHN V
IPC: G06K7/14
Filed: 1980-01-12
Granted: 1984-05-09
Abstract: A line-scanning camera generates signal information indicating marks on a scanned document.  A selectable memory containing several document formats causes the signal information from the scanned document, corresponding to a selected format, to be transmitted for evaluation.
Patent KR-830001913-B1 (KR)
Title: 불순인산의 처리방법
IPC: C01B25/22
Filed: 1980-02-02
Granted: 1983-09-23
Abstract: 내용 없음.
Patent KR-840001190-B1 (KR)
Title: Thermal stabilization of vinyl resins
Inventor: FOURE MICHEL
IPC: C08K5/00
Filed: 1980-05-06
Granted: 1984-08-18
Abstract: Thermal stabilization of halo-vinyl resins comprises blending the vinyl resins with 100 pts. of more than one tintetramercaptide compds. of formula (I) and 10-200 pts. of more than one Crown compds. of formula (II). In the formulas, R1,R2,R3 and R4 are C1-24 alkyl, C5-24 cycloalkyl, C6-24 aryl, C7-24 alkaryl, or R-COO(CH2)n where R is C1-20 and n is 1-6; X is 4 or greater. One or more oxygen atoms may be substituted with sulfur or nitrogen stoms.
Patent KR-850001185-B1 (KR)
Title: Fuel reactor
Inventor: MARKUS GERARDUS ANTHONIUS
IPC: F23R3/06
Filed: 1981-06-16
Granted: 1985-08-19
Abstract: The fuel reactor or high-intensity burner includes an inner shell (16) mounted within an outer shell (11) with an annular space (18) between them, the inner shell having openings (25) in the form of slots. The openings are provided in the vicinity of a tangential combustion air inlet (13), connected to the annular space and adjacent to a discharge nozzle (23) within the inner shell discharge end. The slots allow some air entering the inelt to flow onto the discharge nozzle for cooling. The slots are pref. disposed at circumferentially disposed locations around the nozzle.
Patent KR-850000133-B1 (KR)
Title: Expandable styrene series resin composition
Inventor: HATUO SUGITANI
IPC: C08J9/14
Filed: 1981-07-28
Granted: 1985-02-27
Abstract: A resin compsn. contains (a) 0.03-20 wt.% styrene resin contg. the organosilyl gp. of formula -SiYnR3-n in molecule (where R is an inert monovalent organic gp, Y is a hydrolyzing gp., and n is 1-3), (b) 1- 20 wt.% (based on styrene resin) foaming agent, and opt. (c) organic silane cpd. contg. more than two hydrolyzing gps. The resin compsn. provides a foamed molding having excellent heat resistance.
Patent KR-880001256-B1 (KR)
Title: The selective hydrocarboxylation of propulene to isobutyric acid
Inventor: PESA FREDERICK ANTHONY
IPC: C07C67/00
Filed: 1981-11-13
Granted: 1988-07-16
Abstract: An isobutyric acid is prepd. by the selective liq. phase hydrocarboxylation of propylene with CO and H2O in the presence of a catalyst system at 75-150≰C and 250-5000 psi.  The catalyst system contains Pd (or Pd compd.), HX (X=halogen) and phosphoamine ligand of formula R1R2R4P.  In the formula, R1, R2 and R4 are each opt. sustd. amine, C1-12 alkyl or aryl, but at least one is amino gp. of NR5R6 (R5, R6=H, C1-12 alkyl or aryl).  The catalyst system is thermally stable and does not readily lose selectivity at the reaction temps.
Patent KR-900000443-B1 (KR)
Title: Method and apparatus for condensing evapor component of gas mixture evapor
Inventor: BANERJY ROTAN
IPC: B01D5/00
Filed: 1982-05-14
Granted: 1990-01-30
Abstract: A method of continuously condensing a vapor component of a gas mixt. supplied to a reflux heat exchanger (40) includes the following steps of: a) introduicng a flow of a cryogenic liquid, having a boiling point below that of the vapor component, directly into the liquid phase in the exchanger to cause chilling; b) stirring the liquid phase substantially to preclude local freezing of the liquid phase, the introduction of the cryogenic liquid creating some of the stirring; c) and removing the chilled liquid from the device and returning a portion of the removed chilled liquid as reflux to the device and into contact with gas mixture thereby to condense the vapor component.
Patent KR-890002317-B1 (KR)
Title: Improvements in or relating method of fitting operating conditions of an internal combustion engine
Inventor: CURTIL REMI
IPC: F02B29/08
Filed: 1982-09-10
Granted: 1989-06-30
Abstract: The method is for operating a four-stroke cycle diesel engine supercharged by an exhaust gas-driven turbocompressor with valve timing giving a partial overlap of the opening periods of the exhaust and intake valves, with early intake closure and partial exhaust closure for the major part of the intake step.  This is followed by partial reopening of the exhaust and its final closure near bottom dead center after closure of the intake valve.  At low and medium engine powers part of the super-charged intake air is bypassed to an end of an exhaust manifold.  The cylinder filling factor and combustion air excess are thereby increased and the exhaust valve temperature is reduced.
Patent KR-880000367-B1 (KR)
Title: Method for producing multilayered glass-ceramic structure with coppor-based conductors
Inventor: KAMEHARA NOBUO
IPC: H01L23/15
Filed: 1983-06-11
Granted: 1988-03-20
Abstract: Structure is produced by firing a multilayered structure in which patterns of copper based paste and ceramic layers are laminated alternately.  The ceramic layers are glass ceramic green sheets contg. a thermally depolymerisable resin binder.  Firing is conducted in two stages, the first being in an inert atmosphere contg. water vapour at a partial pressure of 0.005-0.3 atm. at a temp. at which the binder is depolymerised and eliminated but the glass ceramic and copper components are unchanged.  The second firing stage is in an inert atmosphere without water vapour at a higher temp. at which particles of the glass ceramic components coalesce but the matallic stage of the copper is not affected.
Patent KR-880002660-B1 (KR)
Title: Central processor
Inventor: TRUBISKY LEONARD G
IPC: G06F9/34
Filed: 1983-10-10
Granted: 1988-12-17
Abstract: The general purpose digital data processing system with a optimized central processor makes the system to be maximumly effective.  The five-stage central unit obtains instructions in program order from an instruction stack which is loaded when an instruction fetch unit receives an instruction double word from the instruction cache.  In the first stage the operation code is decoded and operand address formation started, using an 18-bit Y portion and 6-bit TAG portion, for completion in the second stage. In the third and fourth stages the directory of the operand cache is searched and the operand is obtained from storage.  In the final stage the distributor distributes each instruction and its operand to the appropriate execution unit.
Patent KR-910001369-B1 (KR)
Inventor: SENO YASUTAKA
IPC: H01H15/06
Filed: 1984-01-19
Granted: 1991-03-04
Abstract: 내용 없음.
Patent KR-910006947-B1 (KR)
Inventor: STEPHENSON GRAHAM W
IPC: E21B17/01
Filed: 1984-01-26
Granted: 1991-09-14
Abstract: 내용 없음.
Patent KR-930001573-B1 (KR)
Inventor: STLECHL JEN A
IPC: F16H48/29
Filed: 1984-03-14
Granted: 1993-03-05
Abstract: 내용 없음.
Patent KR-860002053-B1 (KR)
Title: Process for preparing of briquett
Inventor: KANG SHIN-U
IPC: C10L9/10
Filed: 1984-09-28
Granted: 1986-11-20
Abstract: A briqutte is prepd. from coal of low quality. The briqutte is composed of 50% coal of low quality, 20% graphite, 28% coal of high quality and 2% combustion accelerant. The combustion accelerant is composed of 70% calcium oxide, 5% ferric oxide, 5% potassium nitrate, 5% sodium hydrocarbonate, 5% soot and 10% briquette cinder. This process cuts down cost of production.
Patent KR-870000866-B1 (KR)
Title: Process for the preparation of aryl substituted imidazol compounds
Inventor: ROBERTSON DAVID WAYNE
IPC: C07D471/04
Filed: 1984-11-05
Granted: 1987-04-30
Abstract: Aryl-substd. imidazol compds. (I) and (Ia) [R1=C1-4alkyl, aryloxy, benzyloxy, alkylsulfonyl, halo, cyano, nitro, amino; L,D=N or CH; G=- CH2-,-NR2-, -O-, -S(O)r- (R2=C1-3 alkyl, r=0,1,2); n=2,3  are prepd. by reaction of aryl compd. (III) [E=carboxylic acid  with compd. (II) [A=amino . This reaction is performed in inert solvent containing base, catalytic acid and dehydration agent. The base is pyridine or triethylamine and the acid is ptoluenesulfonicacid and the dehydration agent is thionyl chloride. The compd. (I) is useful as a medicine for thrombosis, asthma.
Patent KR-870000753-B1 (KR)
Title: Deck torquing apparatus
Inventor: YU IK-HYONG
IPC: G11B31/00
Filed: 1984-11-02
Granted: 1987-04-13
Abstract: This apparatus is concerned about the deck driving system of an answering phone, which regenerates or records the message sequentially in one's absence. A reel(2), which has extruded jointing pieces(3) on the reel shaft(21), and a head assembly(27) jointed to the supporting shaft(26) of a inducing plate(25) are fixed on the board(1). A head assembly guide plate(22) is jointed with an acting bar controlled by a solenoid(9). This assembly moves the head up and down. A lever spring(15a) is established in the circular cam(15), which has hollowed portions(13,13',13") jointed with the asist gear(11). The solenoid controls the stopper, which is made on the projectors(14) of the asist gear.
Patent KR-870001175-B1 (KR)
Title: Damper disc
Inventor: FUKATANI YASUNOBU
IPC: F16D13/64
Filed: 1985-01-09
Granted: 1987-06-16
Abstract: The motor vehicle clutch torsion shock absorber disc consists of clutch and retention plates (6,7) on either side of a flange(2). Apertures for torsion spring(12) are located circumferentially between the plates.  The two plates are equipped with vanes (20, 23) on the outer edges of the spring apertures to hold them in place. Each vane is made as part of a plate and has seating projections(21) for the spring ends along the side edges of the apertures.
Patent KR-900007294-B1 (KR)
Title: Thermal head defect detective system
Inventor: ISHIKAWA MARNORU
IPC: G01R31/02
Filed: 1985-01-22
Granted: 1990-10-08
Abstract: A defect detection system of a thermal element comprises a power supply line (4) for supplying the power source (5) to the thermal element (1), a converting switch (7) for switching the printing power source and a power source to detect a defect, and a comparator (9) for detecting the defect of the thermal element by comparing the voltage drop generated by selecting the power source to detect a defect with the reference voltage.
Patent KR-870000236-B1 (KR)
Title: Novel acidic polycyclic ether antibiotic abstract
Inventor: CELMER WALTER D
IPC: A23K20/195
Filed: 1985-02-15
Granted: 1987-02-18
Abstract: A new acidic polycyclic ether antibiotic, CP-63, 517(I), is produced by submerged aerobic cultivation of Streptomyces endus subspecies aereus. I is used to improve feed utilization to promote growth of cattle and swine, and to control coccidiosis. Thus, S. endus aureus was cultivated by conventional fermn. methods and I isolated from the culture broth by extn. with methylisobutyl ketone. The ext. was concd., chromatographed on silical gel, and the column eluted with EtOAc. Fractions contg. I were combined, stirred with Darco G60 carbon and the mixt. filtered. The yield of I Na salt was 800mg from -25L.
Patent KR-890004458-B1 (KR)
Title: Semiconductor device
Inventor: MATSUOKA FUJIO
IPC: H01L27/11
Filed: 1985-04-26
Granted: 1989-11-04
Abstract: The device includes six transistor memory cell in a matrix form , each having a pair of inverters.  Each cell comprises a first-channel type first MOS transistor having a source, drain, gate and substrate region; a second-channel type second MOS transistor having another source, drain, gate and substrate region; a first-channel type third MOS transistor having third source, drain, gate and substrate region; a second-channel type fourth MOS transistor having the fourth source, drain, gate and substrate region.  The gates of the third and fourth MOS transistors are formed on a second portion.
Patent KR-940009068-B1 (KR)
Inventor: MIJOBE TETSUO
IPC: F24H1/10
Filed: 1985-07-08
Granted: 1994-09-29
Abstract: 내용 없음.
Patent KR-940003249-B1 (KR)
Inventor: DUPON JAN-MASHALL
IPC: C06B21/00
Filed: 1986-02-13
Granted: 1994-04-16
Abstract: 내용 없음.
Patent KR-890001041-B1 (KR)
Title: Cooling system for an automobile engine
Inventor: KUSE YOSHIKATSU
IPC: G05D23/13
Filed: 1986-02-18
Granted: 1989-04-20
Abstract: A cooling system for a vehicle engine includes a water jet (1), a radiator (6), a water pump (2), and a thermostat housing (12).  A passage (8,8a) communicates an upper outlet of the water jacket with a lower inlet of the radiator.  A second passage (11) communicates an upper outlet of the radiator with an inlet of the water pump, having the thermostat housing at the upstream of the pump.  A bypass (15) is connected between the first passage and the thermostat housing.  A thermostat (22) comprises a thermosensitive device with valves in the thermostat housing.  The thermo-sensitive device is disposed in the bypass and the valves are operated by the operation of the thermo- sensitive device.
Patent KR-940010115-B1 (KR)
Inventor: OUHADI TRAZOLLAH
IPC: C11D3/20
Filed: 1986-08-04
Granted: 1994-10-21
Abstract: 내용 없음.
Patent KR-910002320-B1 (KR)
Inventor: ANDO HIDEO
IPC: G11B7/12
Filed: 1987-02-28
Granted: 1991-04-11
Abstract: 내용 없음.
Patent KR-890003912-B1 (KR)
Title: Working-up animal intestines
Inventor: YO YONG-SIK
IPC: A23L13/20
Filed: 1987-03-07
Granted: 1989-10-12
Abstract: A processing method of animal intestines is presented.  Thus, 20kg of animal intestines is soaked into 10 kg of water containing 1 kg of edible salt for 3 min, washed, and immersed in a solution containing 500g of sucrose, 150g of vegetable protein, 150g of mono sodium glutamate, 50g of ascorbic acid, 50g of tocopherol, 25g of sodium nitrate, 25g of sodium nitrite, 50g of sodium erysorbate, and 200g of phosphoric acid salt in 11 kg of 10% NaCl solution for 24 hrs to give the final product.
Patent KR-930001692-B1 (KR)
Inventor: MORI MOTOAKI
IPC: B65B13/02
Filed: 1987-04-15
Granted: 1993-03-11
Abstract: 내용 없음.
Patent KR-900004373-B1 (KR)
Title: Checking apparatus for measuring velocity of moving target
Inventor: KOIKE EISHI
IPC: A63B69/38
Filed: 1987-06-13
Granted: 1990-06-23
Abstract: The speed is determined by measuring the time interval between detection of a vibration wave produced when the ball is hit by the tennis player's racket and detection of another vibration wave produced when the ball hits the court surface. A vibration sensor (11), a microcomputer (15) for calculating the speed of movement of the ball, and a liquid crystal display (7) for showing the speed of movement are accommodated in a case which is mounted on the tennis racket. A sound collecting microphone (3a) is attached to the lower edge of the net near a ball landing position on the court, and the detection signal is transmitted by a radiowave to a receiver (17) accommodated in the case.
Patent KR-890002680-B1 (KR)
Title: Mat of cleaning foatwear
Inventor: NIHZAKI HUGOSABURO
IPC: A47L23/22
Filed: 1987-07-14
Granted: 1989-07-24
Abstract: The mat for cleaning off mud or dirt from shoes consists of the plural brush part (2) made of the long holders (6) gripping the fur (5), the fixing groove (11) of the assembling member (3) and bridges on which the plural brush part (2) is put.  The mat can be lain down on a floor like a cushion with the bridges and has the good strength of fastening.
Patent KR-900006192-B1 (KR)
Title: Back bias voltage generator
Inventor: CHO SU-IM
IPC: G11C11/407
Filed: 1987-10-30
Granted: 1990-08-25
Abstract: The generator with a level detecting circuit determining the clamping level being insensitive to the power supply comprises an oscillator (10) for generating pulse, a buffer (20) generating pulse with power supply level, a charge pump circuit (30) generating the back-bias voltage, and a back-bias voltage level detector (40) maintaining the back-bias voltage insensitive to variation of the power supply. The generator fabricated on the semiconductor chip reduces the junction breakdown and leakage current because the reverse bias voltage is lower than conventional one.
Patent KR-960015343-B1 (KR)
Inventor: MCCREADY RUSSELL JAMES
IPC: B01F7/02
Filed: 1987-12-01
Granted: 1996-11-09
Abstract: 내용없음.
Patent KR-960001370-B1 (KR)
Inventor: CLARK A R
IPC: A61P27/02
Filed: 1987-12-22
Granted: 1996-01-26
Abstract: 내용 없음.
Patent KR-950009137-B1 (KR)
Inventor: TSUNEYOSHI WAKUI
IPC: B21B1/22
Filed: 1987-12-24
Granted: 1995-08-16
Abstract: 내용 없음.
Patent KR-900008215-B1 (KR)
Title: Electro motor apparatus of bending m/c
Inventor: NAM HO-HYUN
IPC: B21D5/00
Filed: 1987-12-28
Granted: 1990-11-06
Abstract: The bending machine is used for cutting or bending metal sheet. The device selectively transmits torque from flywheel (10), mounted on bending machine frame (1), to transmission gear (12') (12") of shaft bar (11). The device includes the shaft of gear (15) meshed with gear (11') of shaft bar (11), connected with power input shaft of transmission (16); power generating gear (19) mounted on power output shaft of the transmission (16); transverse bar (7) for rotating spiral shaft bar (6).
Patent KR-950000950-B1 (KR)
Inventor: NIGAM ANIL
IPC: G11B5/596
Filed: 1988-12-07
Granted: 1995-02-06
Abstract: 내용 없음.
Patent KR-970003910-B1 (KR)
Inventor: BROWN KENNETH M
IPC: H01L21/60
Filed: 1988-06-08
Granted: 1997-03-22
Abstract: 요약없음
Patent KR-960003823-B1 (KR)
Title: Composition comprising polymer of 4-methyl-pentene-1
Inventor: SIGEMOTO HIROMI
IPC: C08K3/30
Filed: 1988-06-11
Granted: 1996-03-22
Abstract: A composition comprising a polymer of 4-methyl-pentene-1 and a lithopone, the amount of the lithopone being 1 to 70% by weight with respect to the total weight of the polymer and the lithopone can be used to provide molded products of improved impact strength and excellent gloss.
Patent KR-920004540-B1 (KR)
Inventor: HORIOKA GEIZI
IPC: H01L21/3065
Filed: 1988-08-27
Granted: 1992-06-08
Abstract: 내용 없음.
Patent KR-910009613-B1 (KR)
Title: Method for integration of resistor chod capacitor and structure of semiconductor apparatus
Inventor: KIM HYON-SU
IPC: H01L27/00
Filed: 1988-12-19
Granted: 1991-11-23
Abstract: The method for  integrating  the  resistor  in  semiconductor device comprises the steps of: forming a epitaxial  layer  (2)  on p-type silicon substrate (1), followed by  forming  a  oxide  film (3), nitride film (4) in sequence; removing a fixed  part  of  (4) and (3)  by  photo   lighography   processing;   depositing   the polycrystalline silicon  (7)  and  inserting  the  polycrystalline silicon into the semiconductor device by  lithography  processing; forming a contact hole and metal interconnection line  to  connect the metal electrode (21)  with  polycrystalline  silicon  inserted into device. This method has advantage of decreasing the chip size and contact resistance by using the barrier metal.
Patent KR-0136796-B1 (KR)
Inventor: PEIL WILLIAM
IPC: H03K3/53
Filed: 1988-12-28
Granted: 1998-05-15
Abstract: 내용 없슴
Patent KR-960007902-B1 (KR)
Title: Optical medium
Inventor: KIM BYUNG-HOON
IPC: G11B7/2433
Filed: 1988-12-31
Granted: 1996-06-15
Abstract: The optical recording medium with thickness 200-300A is made by adding titanium and silver to tellurium and selenium based recording film. The proportion of Se is 8-10 atom% to Te, that of Ti is 0.05-0.2 wt% to Te and that of Ag is 0.05-0.2 wt% to Te. The optical recording media doesn't need to have protective film from oxidation, and in case of regeneration CNR(carrier to noise ratio) can be improved.
Patent KR-920005346-B1 (KR)
Title: Wafer transporting method
Inventor: JONG CHAN-SON
IPC: H01L21/00
Filed: 1989-03-14
Granted: 1992-07-02
Abstract: The method automatically feeds a  wafer  on  one  carrier  to another  carrier,  and  simultaneously  arranges   a   flat   zone regardless of the wafer size. The method comprises a process (100) of moving down a roller and left and right elevators  if  a  wafer size gets put in and a start switch gets selected; a process (200) of moving a holder toward the left  elevator  if  there  exists  a wafer in the left elevator;  a  process  (300)  of  detecting  the arrangement position  of  the  flat  zone;  a  process  (350)  of arranging the flat zone by rotating  a  roller  according  to  the input data on the wafer size; a  process  (400)  of  clamping  the holder, and moving the wafer on the left  elevator  to  the  right elevator.
Patent KR-920005215-B1 (KR)
Inventor: SNYDER DAVID A
IPC: H04B10/43
Filed: 1989-07-04
Granted: 1992-06-29
Abstract: 내용 없음.
Patent KR-930000021-B1 (KR)
Inventor: HIROSAKI UKIHIRO
IPC: G06K1/12
Filed: 1989-07-13
Granted: 1993-01-06
Abstract: 내용 없음.
Patent KR-920003705-B1 (KR)
Title: Method of manufacturing amorphous silicon thin film transistor
Inventor: CHOE GWANG-SU
IPC: H01L29/786
Filed: 1989-07-14
Granted: 1992-05-09
Abstract: A thin film transistor of amorphous silicon  is  composed  of glass substrate (1), gate electrodes  (2A,2B),  first  and  second gate insulating layers (3A,3B), amorphous semiconductor layer (4), ohmic layer (5), source electrode (6), drain  electrode  (7),  and transparent conductive film (8). The first gate  insulating  layer (3A) with the thickness of 2500 angstrom is  formed  from  silicon nitride prepared by mixing SiH4 and NH3 in the ratio of 1:7.5, and the second gate insulating layer (3B) with the  thickness  of  500 angstrom is formed from silicon nitride prepared  by  mixing  SiH4 and NH3 in the ratio of 1:1 - 1:4. The produced transistor shows a good on-current property.'