baber/WOPTO huggingface dataset:
Patent KR-810002093-B1 (KR)
Title: Casting mould
Inventor: TAKAKI M
IPC: B22C1/10
Filed: 1977-06-11
Granted: 1981-12-28
Abstract: The mixt. for the cating molds was composed of XCAG which composed of amorphous Ca alumina and CaSO4, or JC which composed of llCaO7Al2O7CaX(X=halogen), CaSO4 and one of 3CaOSiO2, 2CaOSiO2 and 2CaOFe2O3-6CaO2Al2O3Fe2O3(optionally Al2O3/SiO3 wt. ratio was 0.4-1.8) and hardening accelerator such as formalin-naphthalenesulfonate condensate. The amorphous Ca aluminate was prepd. with a portland cement or ultra hardening cement and an alumina cement or Al2O3 - CaO mixt.
Patent KR-830000465-B1 (KR)
Title: 항바이러스제인 글리세롤 및 프로판디올의 아민 및 아미딘유도체의 제조방법
Filed: 1978-08-17
Granted: 1983-03-09
Abstract: 내용 없음.
Patent KR-790000371-B1 (KR)
Title: 2-(phenoxyalkylthio)imidazoles and congeners
Inventor: TWEIT R CH
Filed: 1978-10-27
Granted: 1979-05-09
Abstract: Title compd. (I; R1 = H, C1-C7 alkyl, R2 = H, Me, Alk= C1-C7 alkylene, ph=phenyl, general formula IV. Thus X2=halogen, nitro, cyano, formyl, carboxy, C1-C7 alkyl, ethylenedioxymethyl, C1-C7 alkoxy carbonyl and -COOM+ radical, M chosen alkali metal, alkali earth metal or ammonium phosphate) was prepd. by nitration of III (X2=with the exception of formular V radicals.)
Patent KR-830000594-B1 (KR)
Title: 광각인라인(in line)형 칼라 텔레비젼 영상관용의 자기집중편향요크 구조체
IPC: H01J29/70
Filed: 1979-08-29
Granted: 1983-03-15
Abstract: 내용 없음.
Patent KR-800000999-B1 (KR)
Title: Photoelectricity control auto lighting device
Inventor: SHIN CHAN
IPC: H04M1/22
Filed: 1980-05-23
Granted: 1980-09-19
Abstract: A photoelectric control device maintaining a constant and low lighting by a photoelectric feedback control when not used and lighting a regular candlelight by a interruption of the photoelectric feedback when used is comprised of a variable resistor(VR1), a lignt sensor(pH), a light collecting lens(L), a transistor(Q1), a resistor(R3) maintaing a constant output volt. and a timing condenser(C2). The oscillating period of the switching element(SBS) is adjusted by the charging of the timing condenser according to the adjustment of the VR1's value to adjust the candlelight of the light.
Patent KR-850001834-B1 (KR)
Title: Devices for shuttering and accelerated hardening concrete
Inventor: MARIE GERARD
IPC: B28B21/76
Filed: 1980-11-05
Granted: 1985-12-26
Abstract: To remove the shuttering boards in 13 hrs, hardening is accelerated by heating at 50 - 80≰C for 5 - 8 hrs. Shuttering boards (3) with resistance coil is mounted on the track (10). A screw jack (12) with a ball is set on the track to adjust the height and to keep the concrete level. The concrete can be heated either by resistance heating coil or by hot fluid which flows into the inside of the shuttering boards.
Patent KR-840002303-B1 (KR)
Title: Process for preparing oxaxolines
Inventor: BERNAUER KARL
IPC: C07D263/10
Filed: 1980-12-20
Granted: 1984-12-17
Abstract: An oxazoline deriv. of formula (I) is prepd. by reacting compds. of formula (II) with compds. of formula (III) in an inactive organic solvent, then applying ultraviolet rays. In the formulas, R1 and R2 are H, halogen, or lower alkyl; R3,R4,R5,R6 and R7 are H or lower alkyl; and R8 is H, lower alkyl, or formyl. (I) is an orally active antidiabetic agent.
Patent KR-840001743-B1 (KR)
Inventor: CHING TA-YEN
IPC: C08G77/26
Filed: 1981-05-29
Granted: 1984-10-18
Abstract: 내용 없음.
Patent KR-850000339-B1 (KR)
Title: Support structure for checking and repairing heavy rotatable objects
Inventor: MURAGUCHI YUTAHA
IPC: F16M11/04
Filed: 1981-08-26
Granted: 1985-03-21
Abstract: This invention relates to support equipment used to support the axes of heavy rotatable objects, i.e, turbines for generators or fans for ventilators, when checking and repairing the heavy rotatable objects. This support equipment is control the level (height) of the objects. The objective of this invention is to offer the support equipment for checking and repairing runners, which are equipped with an automatic controller that works the support roller perpendicular to the rotor axis.
Patent KR-870001420-B1 (KR)
Title: Dual steel tubing for damping
Inventor: SASAKI DAKESADA
IPC: F16L9/21
Filed: 1981-09-09
Granted: 1987-07-30
Abstract: The exhaust pipe for high temperature waste gas from a vehicle engine comprises a metal dual tubing.  This has an inner tube and an outer tube which are in contact with each other along the entire longitudinal length of the tubing.  A rib contacts the outer surface of the inner tube and the inner surface of the outer tube.  The rib extends the entire longitudinal diretion of the tubing, and is located at the half section of the dual tubing opposite to the half section where the tubes are in contact.
Patent KR-900007742-B1 (KR)
Title: Nonvolatile memory device
Inventor: KOMORI KAZUHIRO
IPC: H01L27/088
Filed: 1982-08-05
Granted: 1990-10-19
Abstract: The nonvoltaile memory device comprises a number of memory cells composed of insulated gate-type field effect semiconductor elements and terminals for applying writing voltage and a reading voltage to the memory cells. Wirings for connecting in common insulated gate- type field effect transistor elements of the memory cells, and resistance elements of MISFETs which are connected between the wirings and the terminals. The resistance elements or MISFETs are composed of a polycrystalline silicon film or a single crystal silicon film formed on the field insulation film.
Patent KR-850000607-B1 (KR)
Title: Rotary cutter
Inventor: KUBODA MASAO
IPC: B23Q27/00
Filed: 1982-09-30
Granted: 1985-05-01
Abstract: A revolving cutting tool can be defined by an imaginary cylindrical body (1) having a longitudinal center exis (01-02), about which a cutting edge tip(10) is rotatable(Q). A first vertical plane(P1), including the center axis, intersects the end planes (4,6) and defining end faces (3,5) of the cylindrical body. The body is cut by a second vertical plane (P2), which is inclined at an angle (beta) w.r.t. the first vertical plane(P1). The cutting tip has a cutting- edge profile, defined by an intersecting line between the second plane (P2), and a rotational surface drawn by the revolution of the cutting edge about the center axis.
Patent KR-890003494-B1 (KR)
Inventor: MIYAMOTO RIZU
IPC: G11B15/675
Filed: 1984-01-28
Granted: 1989-09-22
Abstract: 내용 없음.
Patent KR-870001071-B1 (KR)
Title: Process for preparing highly crystalline sodium cefoperazone
Inventor: O'BRIEN JR DANIEL JOSEPH
IPC: C07D501/24
Filed: 1984-02-06
Granted: 1987-05-27
Abstract: Sodium cefoperazone is prepd. in a form of high crystallin, which is useful as beta-lactam antibiotic. 1.0-1.5 vol part of water, 2.0-5.0 vol. part of acetone and 1wt. part of sodium cefoperazone is mixd. This mixt. is mixed with acetone and then acetone content of this mixt. is 83-86 vol.%.  The produced slurry is mixed again with acetone and then the final acetone content of this mixt. is 95-97 vol.%.  The produced crystalline sodium cefoperazone is seperated from the slurry.  This procese is performed at 18-25≰C.  The seperated crystalline is dried in vacuum. at 25≰C.
Patent KR-910005929-B1 (KR)
Inventor: MURRAY ALEXANDER P
IPC: G21C15/28
Filed: 1984-07-11
Granted: 1991-08-08
Abstract: 내용 없음.
Patent KR-860001120-B1 (KR)
Title: Hot coke receiving device
Inventor: KUSSUMURA SYOJI
IPC: C10B39/14
Filed: 1984-09-26
Granted: 1986-08-13
Abstract: Hot coke receiving device comprises (a) a ring-like horizintal frame surrounding the outer periphery of the coke bucket body without contact, the frame being connected to the discharge gate by a pair of rods; (b) a pair of outwardly projecting trunnions at opposing points on the frame; (c) a pair of vertical hanger beams secured near but apart from the position of the trunnions; and (d) vertical beams which have a projecting block that engages the trunnions.
Patent KR-860002103-B1 (KR)
Title: Method of bleaching for cork
Inventor: KIM TAE-MO
IPC: B27K5/02
Filed: 1984-11-09
Granted: 1986-11-26
Abstract: A new bleaching method for cork was developed using hydrogen peroxide and sodium chlorite. Thus, 200g cork were treated with 200g sodium chlorite in a closed vessel maintained at 1 kg/cm2. After 10 min, the mixt. in the vessel was treated with 200g hydrogen peroxide in H2O (2:1 ratio) and the vessel was maintained at 60≰C and 2.8 kg/cm2 for 1 h to give bleached cork, which showed the original characteristics.
Patent KR-890001968-B1 (KR)
Title: Process for producing sillicon hydride
Inventor: MIYAGAWA HIROHARU
IPC: C01B33/04
Filed: 1984-12-29
Granted: 1989-06-05
Abstract: Silicon hydrides of formula SinH2n+2 (n=1-6) are prepd. by reacting an Si-contg. alloy with an aq. acid solution in the presence of at least one of inert organic solvent having a boiling point -60 -- 250≰C.  The solvent is ether, hydrocarbon, halogenated hydrocarbon, ketone, aldehyde, amine, silicon hydride or organosilicon carbide. The process can be operated stably for long periods.
Patent KR-920001471-B1 (KR)
Inventor: HAGA TAKAHIRO
IPC: C07D239/34
Filed: 1985-06-14
Granted: 1992-02-14
Abstract: 내용 없음.
Patent KR-880000260-B1 (KR)
Title: Tool changing device of a machine tools
Inventor: SATTO MISSUHARU
IPC: B23Q3/155
Filed: 1985-07-13
Granted: 1988-03-15
Abstract: When a tool is exchanged between a tool magazine device positioned at the upper part of a column and a spindle positioned at the front part of the column, the tool exchanging operation of the exchanging arm is simplified, so that the tool exchanging time can be reduced.  Because the tool magazine device can be positioned at the backside of upper part of the column, it has no bad effect upon the straightness of the column.  The spindle can be moved upward and downward along the column of the machine tool.
Patent KR-930004445-B1 (KR)
Inventor: MIYATA TERUHISA
IPC: C09D175/04
Filed: 1985-08-19
Granted: 1993-05-27
Abstract: 내용 없음.
Patent KR-900005500-B1 (KR)
Title: Dispersing agent composition
Inventor: STRATA JULIUS J
IPC: C09K23/00
Filed: 1985-09-27
Granted: 1990-07-30
Abstract: A dispersing agent comprises (a) a silylated polyether of formula (I) or an isocyanato silane of formula (II), and (b) a phosphate ester of formula (III). In the formulas, R1 is H, C1-12 alkyl, C2-12 alkoxyalkyl or C6-12 acyl; R2 is H, C1-18 alkyl or C6-18 aryl; R3 is H, C1-12 alkyl, C6-18 aryl or C7-18 arylalkyl; R4 is C1-4 alkyl; R5 is C1-18 alkylene, C1-18 arylene or C1-18 aralkylene; R6 is C1-4 alkyl; R7 is H, C1-12 alkyl, C2-12 alkoxyalkyl or C6-12 acyl; R8 is H or C1-20 alkyl; R9 is H, C1-4 alkyl, C6-18 aryl or C7-17 alkylaryl; x + y is 2-100; x is 1-3; w is 0-6; m is 1-3; a is 0-1; b is 0-3; c+d is 0-100; e is 1-2; A is H, Na, K or Li. The agent is used for dispersing ferromagnetic particles in the magnetic coating.
Patent KR-930007343-B1 (KR)
Inventor: MARIO ANDRE
IPC: B65D51/16
Filed: 1985-11-13
Granted: 1993-08-09
Abstract: 내용 없음.
Patent KR-880002377-B1 (KR)
Title: Intermediate blowing device of carding machine
Inventor: LEE GA-HYONG
IPC: D01G15/74
Filed: 1985-11-30
Granted: 1988-11-03
Abstract: This system is an intermediate blowing system in a carding machine, especially for removing flecks from the floor and the side wall of a machine frame (20).  The system consists of a compressor (5), an air controller (6) with a timer (7), and pipelines (13,15) interconnected with serveral elbows (8,12,16...), on which upper blowing nozzles (4,4') and lower blowing nozzles (1) are prepared.  The upper blowing nozzles may clean the side wall of the frame and the lower blowing nozzles may clean the floor. The lower blowing nozzles are covered with a guide plate (22) for controlling the air flow from the nozzles.  Pipelines are attached with several brackets (3,9) onto the floor.
Patent KR-910001282-B1 (KR)
Title: Pouring edge on packing containers
Inventor: NANTIN HANS
IPC: B65D5/06
Filed: 1986-07-01
Granted: 1991-02-28
Abstract: Powring edges in the form of projecting material strips are used on packing containers for e.g. liquid foodstuffs. The pouring edge is generally covered by a tear-off cover strip (6) which also serves as a closure for a pouring opening (7). In order to prevent the pouring edge strip (8) from being torn off or deformed at the removal of the cover strip (6), the same is given a z-folded form and is joined to the outside of the packing container in two seating areas situated at a distance from each other, the doubled area located in between projecting from the packing container and guiding the out folwing liquid.
Patent KR-920009305-B1 (KR)
Inventor: KAKUBARI SENICHI
IPC: F25D11/00
Filed: 1986-09-16
Granted: 1992-10-15
Abstract: 내용 없음.
Patent KR-910000537-B1 (KR)
Inventor: SHIBAIKE NARIDO
IPC: G11B5/55
Filed: 1986-10-24
Granted: 1991-01-26
Abstract: 내용 없음.
Patent KR-970009213-B1 (KR)
Title: Shielded connector with latches
Inventor: FUSSELMAN DAVID F
IPC: H01R13/6581
Filed: 1986-11-12
Granted: 1997-06-07
Abstract: A shielded connector for electrical circuits comprising a non-conducting housing containing electrically conductive terminals and an electrically conductive housing, said electrically conductive housing comprising at least two elements, each of said elements being capable of mating with the other of said elements, at least one of said elements having at least one recessed pocket having an aperture open to the exterior of said element, each of said pockets being adapted to hold a projection on a latch, the interior walls of said pocket being continuous with the exterior walls of said electrically conductive housing and either a portion of said pocket also being located in a second element or at least one wall of said pocket being contributed by a second element.
Patent KR-950006076-B1 (KR)
Inventor: ACHTENBERG THEO
IPC: B64D15/00
Filed: 1986-11-21
Granted: 1995-06-08
Abstract: 내용 없음.
Patent KR-900006547-B1 (KR)
Title: Device for composing of computer memory
Inventor: LEE YOUNG-JIN
IPC: G06F12/02
Filed: 1986-11-29
Granted: 1990-09-13
Abstract: The memory constituent device for software-testing an existance and capacity of the memory board, comprises a confirmed comparator (10) receiving a confirmed signal and an address signal from a computer system bus (1) including an address bus (2), a data bus (3), a control bus (4) and a confirmation bus (5) to compare the confirmed signal with the address signal to transmit a confirmed responding signal to an address map register (14) through a NOR gate (21) and simultaneously to the control bus (4) through an OR gate (20). The address signal (2) on the computer system bus (1) is decoded by an address decoder (7) to be transmitted to a comparator (18) through the OR gate (20) and NOR gate (21).
Patent KR-950003438-B1 (KR)
Inventor: KAKII TOSHIAKI
IPC: G02B6/38
Filed: 1987-03-14
Granted: 1995-04-12
Abstract: 내용 없음.
Patent KR-950005507-B1 (KR)
Inventor: EMANUELBARENDSE NICOLAAS C M
IPC: C07C317/32
Filed: 1987-04-14
Granted: 1995-05-24
Abstract: 내용 없음.
Patent KR-930000849-B1 (KR)
Inventor: IKEDA ICHIO
IPC: E05B77/38
Filed: 1987-04-30
Granted: 1993-02-06
Abstract: 내용 없음.
Patent KR-900007217-B1 (KR)
Title: Process for preparing mercapto acylproline
Inventor: FISCHER JANOS
IPC: C07K5/062
Filed: 1987-06-26
Granted: 1990-10-05
Abstract: Prodn. of 1-(30mercapto-(2S)-methyl-propionyl)-pyrrolidine(2S)- carboxylic acid of formula (I) and its salts, comprises using 1-(3- halo-(2S)-methylpropionyl)-pyrrolidine-(2S)-carboxylic acid (II) or their salt which is reacted with CS(NH2)2 thiourea in an organic dipolar aprotic solvent and the resulting isothiouronium cpd. (III), either as the resulting acid addition salt with a hydrohalic acid or as the inner salt, is hydrolysed, the product opt. being converted into an acid addition salt and/or an acid addition salt obtained being converted into the free base or a different acid addition salt.
Patent KR-900009037-B1 (KR)
Inventor: SUZUKKI MASAYASU
IPC: C09D127/08
Filed: 1987-10-22
Granted: 1990-12-17
Abstract: 내용 없음.
Patent KR-890004897-B1 (KR)
Title: Process for making cheeze in a short time
Inventor: KIM GI-SONG
IPC: A23C19/032
Filed: 1987-10-29
Granted: 1989-11-30
Abstract: Fresh milk is pasteurized at 75≰C for 15sec, cooled to 31≰C, and mixed with 1% of starter composed of 90 parts of Streptococcus cremeris, 5 parts of Streptococcus diacetylactis, and 5 parts of Leuconstoc Cremoris.  The mixture is treated with lipase obtained from Aspergillus niger and rennet obtained from Mucor miehei to make curd.  The curd removed of whey is treated with edible salt, moulded, inoculated with Penicillium candidum, and fermented at 13≰C and 95% of relative humidity for 2 weeks to give a final product.
Patent KR-910002918-B1 (KR)
Inventor: AGUZ HIDEDOSHI
IPC: F16D23/02
Filed: 1988-03-05
Granted: 1991-05-10
Abstract: 내용 없음.
Patent KR-920000065-B1 (KR)
Inventor: BELAIDOUNI ALI
IPC: H01R43/05
Filed: 1988-04-14
Granted: 1992-01-06
Abstract: 내용 없음.
Patent KR-910007322-B1 (KR)
Inventor: CHAN C S
IPC: B41J2/055
Filed: 1988-09-16
Granted: 1991-09-25
Abstract: 내용 없음.
Patent KR-920006989-B1 (KR)
Title: Associative memory processing method using sdf filter
Inventor: JONG JAE-U
IPC: G06K9/74
Filed: 1988-12-23
Granted: 1992-08-24
Abstract: The method is for estimating original  vector  from  severely distorted input vector utilizing synthetic  discriminant  function (SDF).  The   method   comprises:   (A)   designing   SDF   filter corresponding to pattern groups; (B) obtaining the  inner  product of the SDF filter and distorted  input  vector  with  weight;  (C) applying nonlinear  function  to  the  inner  product  vectors  to separate the inner product values; (D) multiplying the  vector  by weight; (E)  overlapping  the  patterns;  and  (E)  taking  signal function on the result of step (D) and returning to the  step  (B) until the original vector can be easily estimated.
Patent KR-900008420-B1 (KR)
Inventor: KIM JONG-TAE
IPC: B23Q7/00
Filed: 1988-12-29
Granted: 1990-11-20
Abstract: 내용 없음.
Patent KR-960009652-B1 (KR)
Title: Needle disposal system
Inventor: MCCAMMON JOHN WESLEY
IPC: A61G12/00
Filed: 1988-04-22
Granted: 1996-07-23
Abstract: A needle disposal system comprises a hand held assembly of three components, namely a disposable container (10) having an inlet in its top face, a head unit (12) securable over said container (10) and a first cap (16) securable over said head unit (12). The head unit (12) has aperture means alignable with said inlet and through which used needles (18) can be fed into said container (10) for non-returnable passage therefrom. The first cap (16) has an aperture (30) alignable with an aperture (22) in said aperture means. The cap (16) has an inverted skirt (32) extending outwardly and upwardly to act as a protective shroud to protect a hand when holding said assembly during a needle inserting operation.
Patent KR-930010620-B1 (KR)
Inventor: ICHINOSE SUSUMU
IPC: G02B30/27
Filed: 1989-08-10
Granted: 1993-10-30
Abstract: 내용 없음.
Patent KR-0133531-B1 (KR)
Title: Controlled release therapeutic system for liquid
Inventor: SANTUS GIANCARLO
IPC: A61K9/54
Filed: 1989-09-12
Granted: 1998-04-23
Abstract: It is an object of the present invention a controlled release therapeutic system for liquid pharmaceutical compositions consisting of:   a) microgranules containing the active principle, in particular theophylline, having dimensions such as to be easily kept in suspension in a liquid medium and suitably treated in such a way as to show characteristics particularly suitable for film coating, b) a series of multilayer films which coat such microgranules and allow the controlled release in a predetermined time of the active principle contained in the granules, and at the same time conceived to maintain the release characteristics for long periods of time, c) a vehicle for the administration in a ready to use or reconstitutable liquid dosage form characterized by containing an immediately available quantity of the active principle.   A process for the preparation of said controlled release therapeutic system is also described.
Patent KR-920008240-B1 (KR)
Title: A circuit which displays a function of electronics product
Inventor: JO KI-YONG
IPC: G11B33/10
Filed: 1989-11-13
Granted: 1992-09-25
Abstract: The circuit indicates  the  various  behavioral  modes  on  a three- color LED in the electronic equipment. The circuit comprises a switching transistor (3) connecting between a hold terminal of a microprocessor (4) and a key (1) for reproducing a  compact  disk, two transistors (5,6) for producing the  first,  second  or  third colors in response  to  the  CD,  radio  or  timer  modes,  and  a three-color LED (7).
Patent KR-100187886-B1 (KR)
Title: A chamfering tool with a cutting knife
Inventor: HEINRICH HEULE
IPC: B23B51/10
Filed: 1989-11-23
Granted: 1999-06-01
Abstract: Described is a deburring tool having cutting blades for deburring the edges of through-bores on either side, having at least one cutting blade, consisting of a rectangular, edge-shaped cutting body having conically running cutting edges, undercut, sharpened flanks and an end bearing face on the cutter head for bearing against the inner surface of a bore. 
<??>The object of the invention is to make bevels to an accurately defined size on the front and rear side of through-bores by means of a deburring tool of the said type. 
<??>To this end, provision is made for a sliding portion deviating from the angle of the cutting edge to be formed in the direction of the axially outer part of the cutting blade, which sliding portion, furthermore, merges into a sliding radius formed at the end face.
Patent KR-0147293-B1 (KR)
Title: Selective asperity definition technique suitable for use in fabricating floating-gate transistor
Inventor: CHEN TEH-YI JAMES
IPC: H01L21/8247
Filed: 1989-12-08
Granted: 1998-11-02
Abstract: In a semiconductor fabrication technique, a first patterned layer (16) of nonmonocrystalline semiconductor material is created on a substructure (10, 12, and 14). An insulating layer (22) is thermally grown along the patterned layer in such a way that the upper edge of the remainder (16A) of the patterned layer forms an asperity (24). A blanket layer 26, preferably consisting of nonmonocyrstalline semiconductor material, is formed over the insulating layer. Using an etchant that attacks the blanket and patterned layers more than the insulating layer, a selective etch is performed to remove a section of the blanket layer. The etch is continued past the blanket layer to remove the underlying portion of the insulating layer located along the asperity and then, importantly, to remove the so exposed part of the asperity. The remainder (26A) of the blanket layer overlies the remainder (24A) of the asperity. The technique is particularly useful in manufacturing a floating-gate FET for an electrically erasable programmable device. The remainder of the asperity facilitates tunneling during erasure.
Patent KR-920006339-B1 (KR)
Inventor: UENISHI MITSUAKI
IPC: G06K19/077
Filed: 1989-04-19
Granted: 1992-08-03
Abstract: 내용 없음.
Patent KR-100187904-B1 (KR)
Inventor: KWON OH-TAI
IPC: G08B13/16
Filed: 1990-02-03
Granted: 1999-06-01
Abstract: 내용 없음.
Patent KR-0144571-B1 (KR)
Inventor: LANDT JEREMY A
IPC: G01S7/292
Filed: 1990-02-16
Granted: 1998-08-17
Abstract: 내용 없음
Patent KR-920002013-B1 (KR)
Title: Copper foil for a printed circuit board
Inventor: KIM YUN-KUN
IPC: C25D1/04
Filed: 1990-03-31
Granted: 1992-03-09
Abstract: A  copper  foil  for  a  printing  circuit  is  produced  by electrolyte-treating  a  side  of  copper  foil  joined   with   a insulating  substrate,  with   chromate   anticorrosive   solution containing one or two element of zinc,  tin,  molybdenum,  nickel, tungsten, magnesium so that the solution  is  composed  of  sodium dichromate 3-20 g/l, zinc sulfate 1-10 g/l,  nickel  sulfate  1-10 g/ l, under the condition of 20-30 deg.C, pH  3.0-5.0  and  current density 0.2-3.0 A/dm2  for  2-30  seconds.  The  solution  can  be composed of anhydride chromate 3-20 g/l, mono  zinc  sulfate  1-10 g/ l, ammonium tungstenate 1-10 g/l.