baber/WOPTO huggingface dataset:
Patent KR-880002476-B1 (KR)
Title: Method of cultivating garnoderma lucidom
Inventor: WADA TOSHIHIKO
IPC: A01G1/04
Filed: 1982-09-30
Granted: 1988-11-19
Abstract: A seed culture of Garnoderma lucidum (Fr.) Karst CM-359 was cultured in a medium contg. 2 kg saw dust of latifoliate tree, 900 g rice bran and 50g CaCO3 at 25↿C for 20 days (R.H.=50%) and maintained at 30↿C for 40 days under the condns. of R.H.=99% and 200 Lux to give its fruiting body, which is useful for a medical purpose.
Patent KR-880000372-B1 (KR)
Title: Heating compounding fiber
Inventor: SUGIHARA DAIZO
IPC: D04H1/544
Filed: 1983-04-27
Granted: 1988-03-20
Abstract: Melt-adherent fibres comprising a compsn. consisting of 50-100wt.% of a polyethylene with a density of 0.910-0.940 g/cm3 and a Q value (=Mw/Mn) of 4.0 or less, and 50-0 wt.% polyethylene with a density of 0.910-0.930 g/cm3 and a Q value of 7.0 or more. The fibres may be comprised solely of the compsn. or they may be composite fibres in which the compsn. continuously forms at least part of the composite fibre surface.  Pref. the other component in the case of composite fibres is polypropylene.
Patent KR-870000358-B1 (KR)
Title: Process for preparing triazole antifungal agents
Inventor: COOPER KELVIN
IPC: C07D407/14
Filed: 1983-06-08
Granted: 1987-03-05
Abstract: 1,3-Bis[1HH-1,2,4-triazol-1-yl)-2-heterocyclyl-propan-2-ol derivs. of formula (I) [Het=aromatic heterocyclic gp.! and their salts were prepd. Thus, 2-bromothiophene was treated with BuLi and ClCH2COCH2Cl followed by 1,2,4-triazole to give I(R=2-thienyl). (I) are useful for treating fungal infections in animals including man. (I) also have activity against a variety of plant pathogenic fungi including rusts, mildews, and moulds.
Patent KR-920000064-B1 (KR)
Inventor: REIDT DEAN K
IPC: H01R43/00
Filed: 1983-07-21
Granted: 1992-01-06
Abstract: 내용 없음.
Patent KR-860000889-B1 (KR)
Title: Apparatus for manufacturing seaweed
Inventor: KIM JONG-SHIK
IPC: A23L17/60
Filed: 1984-05-29
Granted: 1986-07-16
Abstract: This improved seaweed manufacturing device comprises a reciprocating pump (4) connected to the crank arm (3) of a motor driving shaft (6). This transports the seaweed mixture at a constant rate from the agitation tank (12) to the bucket (27, 27a). It automatically opens the bucket with the partition (c,c1) via a descending motion of (4). This ensures uniform loading with constant width into the seaweed bed (38) on the belt conveyor (15) having drain holes (b).
Patent KR-910008724-B1 (KR)
Inventor: SUCIU GEORGE D
IPC: C07C51/25
Filed: 1984-08-08
Granted: 1991-10-19
Abstract: 내용 없음.
Patent KR-910000560-B1 (KR)
Inventor: TOMMIS NORMAN
IPC: C23C8/32
Filed: 1984-09-06
Granted: 1991-01-26
Abstract: 내용 없음.
Patent KR-850000892-B1 (KR)
Title: Process for preparing trisubstituted imidazole derivatives
Inventor: SALLMANN ALFRED
IPC: C07D233/20
Filed: 1984-09-27
Granted: 1985-06-26
Abstract: Imidazoles (I; R1,R2 = phenyl, substituted phenyl (substitute) is halogen, hydroxy, lower alkyl, or lower alkoxy), pyridyl or 1-oxido- pyridyl; A = lower alkylene, lower alkylidene, or cycloalkylidene; R3 = lower alkoxycarbonyl, or lower alkanoyloxi-substd. lower alkoxycarbonyl; R3' = carboxy or reactable carboxy substitute; with the proviso that (i) at least one of R1  and R2 is other than phenyl when A is CH2 or CHMe and R3 is COOEt) were prepd. by the esterification of II with alcohol, sulfonic acid ester or alkylhalide.
Patent KR-890002921-B1 (KR)
Title: Fluid deflecting assembly
Inventor: SUGAWARA NORIO
IPC: F24F13/072
Filed: 1984-10-11
Granted: 1989-08-11
Abstract: The equipment for air conditioning with increased deflection angle comprises a passage (3) having an inlet (4) and an outlet (5), and one or more sets of deflector plates (7) rotatably mounted on a number of shafts (6) near the outlet.  The plates in each set are mounted along a curved line.  In one end position the plates together form a continuous curved guide wall (8) inside the passage, diverging from the direction of flow.  The guide wall attracts the current of air and thus deflects the entire current at the outlet due to the Coanda effect.
Patent KR-890001634-B1 (KR)
Title: Forming press method of bending plate for angles
Inventor: JO HYON-BONG
IPC: B21D5/01
Filed: 1984-11-30
Granted: 1989-05-12
Abstract: This invention is a forming method to form a curved parallel face on a corner of an angle bend.  Bulging a designated place of angle in a range of 90 degree by rolling process, and then pressing the bulged part to straighten while bending the angle at the part bulged.  As a result a continuous curved parallel face is formed without shearing and welding process.
Patent KR-880000650-B1 (KR)
Title: Sound braking device
Inventor: KIM GUN-TAE
IPC: H04N5/60
Filed: 1984-12-31
Granted: 1988-04-19
Abstract: This invention is concerned with the sound break device when image signal of television is not applied.  The oscillation signal of an oscillator (1) which is applied to the horizontal driver circuit (3) through 1/2 branch circuit (2) is applied to 1/525 branch circuit (4) .  After the synchronized output is integrated and rectified in circuit (7), it is applied to 1/525 branch circuit through a window circuit (8).  The 1/525 branch circuit (4) is composed of a commonly used T-flip flop circuit and from the circuit(7) the vertical synchronized signal is applied to the circuit (4) so as to be synchronized with vertical signal.
Patent KR-910000970-B1 (KR)
Inventor: HIROSE MASASHI
IPC: H01C10/32
Filed: 1985-01-28
Granted: 1991-02-19
Abstract: 내용 없음.
Patent KR-890002191-B1 (KR)
Title: Power supply momentary interruption processing system of radio communication equipment
Inventor: ONO MASARU
IPC: H04W84/08
Filed: 1985-02-08
Granted: 1989-06-22
Abstract: The system comprises a power source (1), a converter (2) for supplying the adequate voltage to peripheral circuits, in which includes a voltage detector (201) for checking the input voltage of the converter, a displayer (4), a controller (5) including a voltage detector (505) checking the input voltage of the controller and a memory (7), a transceiver (6) including a high frequency switch (605) which is disconnected when the detector (201) provides low signal, and a memory (7) for storing the control information.  When the voltage of the converter drops under certain level, a condenser (504) in the controller provides the compensation voltage to a CPU (1) and the memory.
Patent KR-880001686-B1 (KR)
Title: Collapsible vertical wind mill
Inventor: YOM NAK-IN
IPC: F03D3/06
Filed: 1985-03-26
Granted: 1988-09-06
Abstract: Four straight main wings are arranged in rhombic form capable of vertex or corner angle variation and with opposed upper and lower vertices or corners penetrated by a vertical centre shaft. The upper corner of the rhomb is held at a fixed position with respect to the shaft.  The lower corner of the rhomb is constituted by a slidable ring slidable along the shaft.  A ring stopper is provided on the shaft at a lower position for providing a lower limit position of the slidable ring.  Auxiliary wings are each provided on and project from each of the main wings, and are made of a flexible material.
Patent KR-900005064-B1 (KR)
Title: Noise reduction apparatus
Inventor: HITOTSMATSI SHUZO
IPC: H03G3/34
Filed: 1985-04-16
Granted: 1990-07-19
Abstract: An audio signal is divided into two discrete signals which have a phase difference between them and are transmitted onto two separate transmission paths. Two hold circuits (5,7; 10,11) are each arranged in one of the transmission paths and are put into operation in synchronism with the switching of record patterns to be produced or the occurrence of a dropout in the reproduced signal. The output signals of the two hold circuits are added (12) together to reduce the noise contained in the output audio signal. The operartion of the hold circuits is synchronised with noise by use of a detector (2) and th phase difference is introduced by the inclusion of a phase shifter (9) between the two hold circuits.
Patent KR-910000808-B1 (KR)
Title: Disposable package for dispensing liquids with controlled pate of flow
Inventor: RICHTER SIMON J
IPC: B67D3/00
Filed: 1985-06-20
Granted: 1991-02-09
Abstract: A disposable container for use as a syrup package in a post-mix beverage dispenser comprising a base end and a discharge end opposite thereto, sidewalls extending from the base end towards the discharge end, and a neck connecting the sidewalls to the discharge end and defining a discharge opening through which syrup or flavor concentrate may be dispensed. A flow-rate control tube having an openable, sealed end and a closed end is integrally formed with the container sidewalls. The flow-rate control tube has the openable, sealed end positioned in the container base end and has a major portion which extends substantially longitudinally of the container on the outside of the sidewalls, to an associated minor portion of the tube, which extends through the neck of the container so that the open end of the tube is in communication with the interior of the container in the neck region.
Patent KR-890002896-B1 (KR)
Title: Desulfurization flux of cac2-cac03
Inventor: KIM KI-CHANG
IPC: C21C7/064
Filed: 1985-06-24
Granted: 1989-08-08
Abstract: Desulfurization flux consists of calcium dicarbide 70-98 wt.% and calacium carbonate 2-30 wt.%.  The flux shows below 0.5mm in grain size.
Patent KR-880002190-B1 (KR)
Title: Process for producing lignin from agricultural waste matters
Inventor: KANG HO-KUN
IPC: C13K13/00
Filed: 1985-09-14
Granted: 1988-10-17
Abstract: The process for preparing furfural, xylose, MeOH, EtOh and lignin from lignocellulose contg. pentosan comprises (a) hydrolysing a raw material with 4-10 wt.% H2SO4 (solid:liquid=1:3-7) for 2hr at 98-130↿C and filtering the hydrolysate, (b) recovering furfural from the filtrate using stripping column, low boiling head column and hehydrating column, (c) hydrolysing the filter cake from (a) with 6- 15 wt.% H2SO4  for 1-2hr at 120-140↿C and filtering, (d) neutralizing the residual filtrate from (b) and the filtrate from (c) with Ca(OH)2 to pH 4-6, filtering and fermenting the filtrate at 25-32↿C using a brewer's yeast, (e) recovering EtOH and xylose from the fermented soln.  Using an ethanol column and a light solvent column, (f) neutralizing the residue from (c) with NaOH, filtering, washing and drying to provide lignin.
Patent KR-920009308-B1 (KR)
Inventor: NOGUCHI ICHIHIRO
IPC: F25B41/06
Filed: 1985-11-11
Granted: 1992-10-15
Abstract: 내용 없음.
Patent KR-900001313-B1 (KR)
Title: 4h-1-benzopyran-4-ones and their preparation
Inventor: JAEN JUAN C
IPC: C07D335/06
Filed: 1986-01-30
Granted: 1990-03-08
Abstract: Title compounds I [X=O, S; R=A or B; Ar=phenyl, lower alkyl, alkoxy, thioalkoxy, halo, TFM, Het; Het=2-, 3-, or 4- pyridinyl, lower alkyl, alkoxy, et.! are prepared.  Thus, a mixture containing 10mmol 7-(3- chloropropoxy)-4H-benzopyran-4-one, 11mmol 1-(2-chlorophenyl) piperazine dihydrochloride, 35mmol NaHCO3, and 0.6mmol NaI in 50ml dimethyl formamide is boiled at 85-90oC for 7 hrs.  Solvent is evaporated and the organic layer is treated with 10% HCl-methanol solution.  After evaporation, the resulting residure is recrystallized with ethanol/ethylacetate to give 3.2g 7-[3-(4-(2- chlorophenyl)-1-piperazinyl)propoxy!-4H-1-benzopyran4-one.
Patent KR-890001747-B1 (KR)
Title: Automatic exchange machine of dial inside frame in phototype setting machine
Inventor: MORISAWA YOSHIAKI
IPC: B41B17/20
Filed: 1986-03-17
Granted: 1989-05-19
Abstract: The device selects a frame out of a plurarity of characterboard inner frames and exchanges it for another one in setting.  A plurarity of arms attached to a rotating member are each provided with hooks that are arranged to move back and forth and up and down and hook into rings on the boards by actuation of respective cams.  The hooked board frames are taken into or out of the board for exchange.  The system performs an easy and speedy exchange operation of characters for phototype setting.
Patent KR-900000434-B1 (KR)
Title: Method for producing moulded coil
Inventor: NAGAYA TSUNEHIKO
IPC: H01F41/12
Filed: 1986-03-21
Granted: 1990-01-30
Abstract: The method for manufacturing a winding assembly is used for a static electricity inducing equipment such as a transformer and a reactor. The winding assembly includes a winding barrel around which a conductor (42) and at least a insulator (33) are wound with the number of predetermined layers, and a resin injected on the layers of the conductor and the insulator.  The method comprises a step for installing a winding barrel having a plurality of barrel segments, a step for winding a thin plate around the winding barrel, and a step for winding the conductor and the insulator alternately around the thin plate.
Patent KR-920008198-B1 (KR)
Title: Controller of gas cooking stove
Inventor: YAMASHITA TADAO
IPC: F23N5/14
Filed: 1986-04-18
Granted: 1992-09-25
Abstract: The  system  for  controlling  the  temperature  of  cooking materials or the flame power  of  the  range  has  a  proportional solenoid valve (1) mounted between  safety  valve  (11)  and  main burner (101) for controlling  gas  flow  by  electric  current,  a temperature sensor (6) for detecting the  temperature  of  cooking materials, a control-pattern selecting unit (8) including at least one memory means for the temperature of cooking materials  or  the flame power of the range. The safety valve (11) is mounted on  the lower part of main valve (12) to automatically close when the fire extinguishes.
Patent KR-890002222-B1 (KR)
Title: Textile fabric processing system
Inventor: SANDO YOSHIKAZU
IPC: D06B5/08
Filed: 1986-05-19
Granted: 1989-06-23
Abstract: Cloth treating appts. has a shifter to displace each or either of pair of frames forming cloth carrying path having wide and narrow areas defined by projective and recessed parts of the frames, and a fluidiser to form vortical or turbulent flow of fluid in wide areas.
Patent KR-870001540-B1 (KR)
Title: Decyanation of pergolide infermediate
Inventor: MISNER JERRY W
IPC: C07D457/02
Filed: 1986-08-14
Granted: 1987-09-02
Abstract: Ergoline derivs. of formula(I) and their pharmaceutically acceptable acid addn. salts are prepd. by treating(II) with alkaline metal hydroxide at 100-175≰C.  (I) have dopamine D-2 agonist activity and can be used to lower elevated blood pressure at a dosage which does not cause interaction with alpha receptors. (I) can also be used to inhibit prolactin secretion, treat endocrine disorders (e.g. sexual dysfunction) depression or anxiety, improve potency and alleviate symptoms of parkinsonism.
Patent KR-940002262-B1 (KR)
Title: Electrolytic apparatus and method of operating it
Inventor: ECONOMOPOULOS MARIOS
IPC: C25D7/06
Filed: 1986-10-14
Granted: 1994-03-19
Abstract: An anode arranged very close to a cathode in an electrolytic circuit is constituted by a plate formed with first and second sets of orifices, both distributed over the surface of the plate. The first set is connected to electrolyte supply means and the second set to electrolyte discharge means with the aim of producing high turbulence in the narrow space between the anode and cathode.
Patent KR-890002016-B1 (KR)
Title: Intraintestinal bypass graft
Inventor: RAVO BIAGIO
IPC: A61F2/04
Filed: 1986-11-27
Granted: 1989-06-08
Abstract: An improved intraintestinal bypass graft (1) for attachment in the lumen of a resectioned intestine or duct upstream of the anastomosis site in order to protect the healing anastomosis comprises an elongated tube (3) formed of a thin, highly flexible, water-impervious wall material terminating at its distal end (7) in a short, reduced diameter nipple (11). The surgical procedure for implanting the bypass graft can be simplified and shortened in time by readily fitting the distal nipple over one end of an elongated pliable leader, or alternatively over the terminal anvil nut of a circular anastomosis surgical stapler, and then drawing the leader or stapler body through the patient's anus to pull the distal end of the bypass graft out of the anus. The need to tie the distal end of the bypass graft to the leader or surgical stapler is eliminated.
Patent KR-900000609-B1 (KR)
Title: Injection device of printer using crt
Inventor: CHANG MOON-KIL
IPC: G06K15/00
Filed: 1986-12-27
Granted: 1990-02-01
Abstract: The scanner includes an electron gun (EG) depositing the inner sides of glass plates (20,21) for radiating the laser beam, a horizontal deflection controller (HD), metal wires (261-26n+1) arrayed with certain intervals for forming a negative charged dormant image on the drum charged by positive electrons emitted by the electron gun, and a sealing glasses (22,23) for sealing the glass plastes (20,21) and the metal wires (261-26n+1).
Patent KR-900000524-B1 (KR)
Title: Process for preparing 5'-xantyl acid by fermentation
Inventor: SONG SUK-WON
IPC: C12P19/06
Filed: 1987-06-04
Granted: 1990-01-31
Abstract: A 5'-xantyl acid is prepd. by culturing brevibacterium ammoniagenes(KFCC 10004)(having 5'-xantyl acid producibility) in culture medium contg. up to 1 species of L-glutamic acid or phytic acid.  5'-xantyl acid is useful as a raw material for prepg. 5'- guanilic acid, which is used as a nucleic acid seasoning.
Patent KR-960013035-B1 (KR)
Inventor: JIERII DEIIN ROIDO
IPC: H02K15/02
Filed: 1987-08-31
Granted: 1996-09-25
Abstract: 내용없음
Patent KR-960012774-B1 (KR)
Inventor: OKA SHINYA
IPC: B41J13/10
Filed: 1987-10-16
Granted: 1996-09-24
Abstract: 요약없음.
Patent KR-900007529-B1 (KR)
Title: Pad for air bag device
Inventor: SHIRAKI KOUJI
IPC: B60R21/20
Filed: 1987-12-30
Granted: 1990-10-11
Abstract: The pad is shaped like a box, and comprises an upper wall and side walls extending downward from the fringes of the upper wall. The pad is moulded integrally with an insert on which a coat layer is formed out of a soft synthetic resin. The coat layer has a thinwalled portion that breaks when the air bag inflates. The thinwalled portion is disposed at a given position on the upper wall. The insert comprises a rectangular tubular base portion made from a synthetic resin and flexible nets disposed on opposite sides of the thin-walled portion.
Patent KR-910000298-B1 (KR)
Inventor: TAKEGAWA YUJIRO
IPC: D03D47/30
Filed: 1987-12-31
Granted: 1991-01-24
Abstract: 내용 없음.
Patent KR-930002938-B1 (KR)
Inventor: HANAOWA KATSUO
IPC: H01B3/00
Filed: 1988-03-04
Granted: 1993-04-15
Abstract: 내용 없음.
Patent KR-940004944-B1 (KR)
Inventor: NIRAZAWA NOBUHIRO
IPC: H01G13/00
Filed: 1988-03-19
Granted: 1994-06-07
Abstract: 내용 없음.
Patent KR-910006388-B1 (KR)
Title: Composition of emulsion paints
Inventor: CHO YONG-HO
IPC: C09D5/02
Filed: 1988-11-16
Granted: 1991-08-21
Abstract: A  water-type  paint  is  produced  by  reacting  an  anionic synthetic resin with an amine cpd. as a basic neutralizing  agent, mixing a reactant with a mixed solvent of alkyl titanium cpd.  and alcohol, and water-solubilizing the mixt. with a  purified  water. The synthetic resin is pref. alkyd resin, polyester  resin,  epoxy ester resin or  urethane  resin,  and  the  amine  cpd.  is  pref. triethylamine,  dimethalamine,   N-   dimethyl   ethanolamine   or N- ethyl-diethanolamine.  The  paint  has  a  good  corrosion-  and chemical-resistance.
Patent KR-930005859-B1 (KR)
Inventor: KOBAYASHI KASUHIKO
IPC: B60R13/04
Filed: 1988-11-30
Granted: 1993-06-25
Abstract: 내용 없음.
Patent KR-0128729-B1 (KR)
Inventor: DUWAER
IPC: G09G3/36
Filed: 1988-12-26
Granted: 1998-04-22
Abstract: 내용없음.
Patent KR-910002176-B1 (KR)
Title: Gas-permeable porousbody its production and pressure casting mold
Inventor: YUKITO MURAGUCHI
IPC: C04B38/00
Filed: 1988-02-26
Granted: 1991-04-06
Abstract: This invention relates to a gas-permeable porous body and production thereof by blending siliceous pagodite, limestone and clay in such a manner that SiO2 accounts for 70 to 88 wt.%, CaO 5 to 23 wt.% and Al2O3 5 to 15 wt.%, molding the mixture and sintering the mold at 1,000 DEG C or above. This porous body has an extremely uniform pore diameter and high gas-permeability and is used for a filter or an aeration member or for a mold for pressure casting. This invention relates also to a pressure casting mold having drain paths (5, 5') which are formed near the boundary surfaces between surface layers (50) and support layers (60). The surface layer (50) is made of the gas-permeable porous body described above. This mold makes it possible to release smoothly a thickened portion.
Patent KR-960011526-B1 (KR)
Inventor: ARMIN AISERMAN
IPC: E05B47/00
Filed: 1989-02-15
Granted: 1996-08-23
Abstract: 내용없음.
Patent KR-910008069-B1 (KR)
Inventor: CHON BYONG-SIK
IPC: G03G15/00
Filed: 1989-02-28
Granted: 1991-10-07
Abstract: 내용 없음.
Patent KR-920002992-B1 (KR)
Inventor: MAKATI ASHOK C
IPC: C09J121/00
Filed: 1989-03-27
Granted: 1992-04-11
Abstract: 내용 없음.
Patent KR-910010033-B1 (KR)
Title: Non cop weaving method and equipment
Inventor: RYU KYUNG-HYUN
IPC: D03D47/00
Filed: 1989-07-27
Granted: 1991-12-10
Abstract: The copeless weaving system is characterized by  feeding  the front edge of the weft, hanging it on the  shuttle  hook  and  the suction hole, gripping it in the inner  clipper  of  the  shuttle, feeding the rear edge of the weft in the cone, passing it  through the first shuttle box (2) and then picking the weft from  the  box (2) to the second box (2'), beating it in the  box  (2'),  cutting it, picking it from the box (2') to the box (2), sucking the  edge of the weft in the  edge  hopper,  beating  it,  cutting  it,  and weaving it.
Patent KR-930001526-B1 (KR)
Inventor: KUWAHARA YORIYUKI
IPC: F27D17/00
Filed: 1989-09-05
Granted: 1993-03-02
Abstract: 내용 없음.
Patent KR-0139417-B1 (KR)
Title: Cutting insert for chip forming machining
Inventor: PETTERSSON LARS T
IPC: B23C5/20
Filed: 1989-09-21
Granted: 1998-06-01
Abstract: The invention relates to an insert for chip forming machining. The insert (10) is a body having polygonal basic shape and is provided with a cutting edge at the periphery thereof and a chip former. The chip former is provided in the shape of a plurality of ridges (23) whereby the mutual distance between adjacent ridges diminishes in direction towards the middle of the cutting edge so as to form a conical corrugated chip (30) which is forced away from the workpiece during machining.
Patent KR-0140881-B1 (KR)
Title: Disk cartridge
Inventor: NAKAGAWA KENJO
IPC: G11B11/105
Filed: 1989-09-22
Granted: 1998-07-15
Abstract: A disc cartridge (1) having a cartridge body (2,3) in which a magneto-optical disc (4) is rotatably accommodated in a hermetic-fashion so as to be capable of recording and/or reproduction. The cartridge body has a concave cut-away portion (22) extended from an insertion side end face of the cartridge body (2,3) to a central portion of the cartridge body to introduce extemal magnetic field generating means (34) which generates an external magnetic field to record an information signal on the magneto-optical disc (4) accommodated within the cartridge body (2,3).
Patent KR-920000416-B1 (KR)
Title: Process for preparing for high quality terephthalic acid
Inventor: PARK SANG-ON
IPC: C07C51/06
Filed: 1989-10-13
Granted: 1992-01-13
Abstract: A  method  for  preparing  high  purity  terephthalic   acid comprises  (a)  neutralizing  sodium   terephthalate   in   alkali treatment  waste  water  with  an  acid   to   recovery   impurity contg.-terephthalic   acid,   (b)   crushing   the   obtd.   crude terephthalic  acid  to  a  size  of  0.1-1,500 μm,  (c)   pouring oxigen-contg. gas at 0.01 ml/min - 1000 l/min  pouring  rate,  and heat-treating at 150-300 deg.C, and (d) removing the  impurity  by use of ammonia water soln.