baber/WOPTO huggingface dataset:
Patent KR-820000772-B1 (KR)
Title: Insecticidal composition condaining optrically active -cyano-3-phenoxy-benzyl-2-(4-chloro-phenyl) isovalerate
Inventor: OUNO NOBUO
IPC: A01N31/08
Filed: 1977-08-18
Granted: 1982-05-10
Abstract: Title compd. was prepd. as the ester(I) of the (S)-(+)-acid with the racemic alc. by treating (S)-(+)-4-ClC6H4CH(CH Me2)CO2Na with (+)-3-PhOC6H4CHBrCN; I was chromatographed to give the ester(II) of the (S)-(+)-acid with the (S)-(-)-alc.  The insecticidal activity of II was consistantly higher than that of I and the activities of both exceeded that of the racemic ester(III); the phytotoxicities increased in the same order, I<II<III.  Thus, LC50 against Spodoptura litura was 1.7, 5.0 and 12 ppm for I, II and III, resp.
Patent KR-820000204-B1 (KR)
Title: Compact optical viewer for micrafiche or cassette
Inventor: VEVICK G
IPC: G03B21/11
Filed: 1977-09-01
Granted: 1982-03-04
Abstract: In the compact microfiche reader, light from a microfiche or cassette microfilm is projected and undergoes several reflections prior to striking a viewing screen.  One of the reflecting surfaces is defined by a prism sheet having a number of prisms.  Light is both reflected by and passes through the prism sheet, the prism sheet thus defining a dual-function optical surface.  This makes possible a more compact viewer.  Several alternatives employ foldable reflecting surfaces and a foldable viewing screen to further reduce the size of the reader.
Patent KR-810000636-B1 (KR)
Title: Process for preparing cephalosporin compound
Inventor: SHIRAISHI MITZURU
IPC: C07D501/18
Filed: 1978-02-28
Granted: 1981-06-10
Abstract: Title compds.(I; X = organic group) were prepd. by substitution of R' with H of II(R1 = acyl).  Thus, 6.15 g 7-[D-5-phthalimido-5-carboxyvalerylamido -3-(2-carboxybenzoyloxy)methyl-3-cephem-4-carboxylic acid was suspended in dichloromethane and reacted with N,N-dimethylaniline and dimethyldichlorosilane at 20-25≰C for 30 min.  The obtained product was reacted with 4.20 g phosphorus pentachloride at -25±2≰C for 30 min to give 3.43 g 7β-amino-3-(2-carboxybenzoyloxy)methyl-3-cephem-4-carboxylic acid.
Patent KR-800001634-B1 (KR)
Title: Process for preparing oxazoles
Inventor: WESTON G
IPC: C07D263/32
Filed: 1978-07-18
Granted: 1980-12-31
Abstract: 4.5-Diaryloxazol-2-yl alkanoic acid derivs.(I; Ar, Ar1 = Ph, naphthyl, thienyl, furyl or substituted phenyl; R = carboxyethyl, carboxypropyl) useful as antiinflammatory agent were prepd. by esterification and cyclization of alloylaryl carbinol(II) with butandioic acid or pentandioic acid.  Thus, 373 g succinic anhydride, 531 g benzoine and 296 g pyridine were stirred at 90-950C, 15 hr and then were reacted with 1300 ml CH3COOH and 385 g NH4NO3 at 90-950C, 2 hr to give 702 g(67%) β-(4,5-diphenyloxazole-2-yl)propionic acid.
Patent KR-810001677-B1 (KR)
Title: Process for the selective hydrogenation of gasolines comprising both gum-generating compounds and undesirable sulfur compounds
Inventor: COAYNS JENA
IPC: C10G45/04
Filed: 1978-11-29
Granted: 1981-10-27
Abstract: Gasolines, including steam-cracked gas oil fractions, were hydrogenated over Pd and Ni catalysts to reduce gumforming compounds and mercaptans, with minimum reduction of monoolefins.  Result unsaturated gasolines are sweet and have a low gum-generator content.
Patent KR-820002298-B1 (KR)
Title: Process for preparing 1,2-benzoiso-thiazoline-3-one-1,1-dioxide derivatives
Inventor: SEKI S
IPC: A01N43/30
Filed: 1979-03-20
Granted: 1982-12-15
Abstract: Title compds.(I; R1, R2 =same or not alkyl, aryl, aralkyl, formig heterocyclic ring, X = H, halogen, nitro, carboxy, carbamoyl; n = 1-4) useful as fungicide for agriculture, were prepd. by the reaction of excess II and III in the presence of reactive compds. with OH group of oxoacid such as trichlorophosphate, oxychlorophosphate.
Patent KR-830001238-B1 (KR)
Title: 자전거 페달 작동식 브레이크 제어 및 이완장치
IPC: B62L5/00
Filed: 1979-08-27
Granted: 1983-06-27
Abstract: 내용 없음.
Patent KR-840001018-B1 (KR)
Title: Article of jewellery
Inventor: DIEHL DR WALTER
IPC: A44C15/00
Filed: 1981-03-27
Granted: 1984-07-20
Abstract: An article of jewellery, preferably shaped like a butterfly or insect, has two attachments ; one for each end of a chain. The attachments are fixed to the free ends of inherently rigid wires, the other ends of the wires being fastened to the body of the article in such a way that they articullate freely with the body. An eye encircling each end of the chain, which can slide along the chain, is fixed to one end of each of a pair of elongated parts. The other ends of the elongated parts are fastened to the body of the article of jewellery is such a way taht they articulate freely with the body, the points of attachment of the elongated parts being spaced apart from the points of attachment of wires.
Patent KR-840000296-B1 (KR)
Title: Labelling machine
Inventor: YAMASIDA KYOIJJI
IPC: B65C9/40
Filed: 1981-04-04
Granted: 1984-03-16
Abstract: The labelling machine used to stick labels on the outer surfaces of container bodies(10) includes a first driving mechanism(1˜5) and a second driving mechanism(1'˜5').  The labelling machine consists of a pair of label-roll drums(1,1'), a pair of drawing rollers(3,3'), a pair of cutters(4,4'), a pair of feed rollers(5,5'), a label-sticking roller(6), two end detectors(12) for a label roll, and a paste roller(7).  The second driving mechanism begins to work when the starting end of the label roll is detected, and the first driving mechanism begins to work when the terminating end of the label roll is detected.
Patent KR-860001580-B1 (KR)
Title: Process for preparation of benzylimidazol derivatives
Inventor: OGATA MASARU
IPC: A61P7/02
Filed: 1982-05-14
Granted: 1986-10-10
Abstract: 3-(o-(Heterocyclylalkyl)phenoxy)-2-hydroxy-N-alkylpropylamine derivs. of formula I [R=5- or 6-membered unstad. heterocycle contg. 1-3N, (un)substd. benzimidazolyl; X=CHR6C;CR7R8 (R6, R7, R8=H, C1-4alkyl); R1=C1-4alkyl; R2=H, C1-4alkyl, R1R2N= pyrrolidino, piperidino, piperazino, morpholino;R3,R4,R4=H, C1-4 alkyl, C1-4alkoxy, halo! and their acid addn. salts were prepd. Thus, treating imidazole with SOCl2 followed by 2,3,5-HOCl2C6H2COMe gave imidazole II, which was treated with epibromohydrin followed by reacting with Me2CHNH2 to give the imidazole (III). Cpds I are antiarrhythmic agents for treating arrhythmias and for prophylaxis of angina pectoris.
Patent KR-830002581-B1 (KR)
Title: 피가공물에 금속을 도금하여 악세사리를 제조하는 방법
IPC: A44C27/00
Filed: 1982-05-17
Granted: 1983-11-16
Abstract: 내용 없음.
Patent KR-850001395-B1 (KR)
Title: Wrist of industrial robot
Inventor: INABA HAJIMU
IPC: B25J9/14
Filed: 1982-06-30
Granted: 1985-09-30
Abstract: The robot wrist(30) is attached to a robot arm(120) and includes first(36) and second(38) rotary output shafts. Each shaft has an end face(36a, 39a) for attaching robot hands, the end faces being orthogonal and positioned on two orthogonal end faces of a wrist housing(34). Both the output shafts are rotated by a single electric servomotor(40). Air under pressure is introduced into the wrist housing(34) from the robot arm by an air supply pipe(44). The pipe is brought into the housing through a covering plate(42). The air supply pipe(44) is connected to a fluid conveying pipe(62) that leads to air passages in the output shaft(36,38).
Patent KR-830002785-B1 (KR)
Title: 보혁광택제가 함치된 편상지포 및 그의 제조방법
IPC: A47L23/08
Filed: 1982-07-23
Granted: 1983-12-16
Abstract: 내용 없음.
Patent KR-900006051-B1 (KR)
Title: Air cleaning device
Inventor: PETERSON ROSS T
IPC: F02M35/022
Filed: 1983-03-25
Granted: 1990-08-20
Abstract: A vehicle internal combustion engine air cleaning device comprising a housing having a cylindrical portion, a bottom wall and a hood surmounting the cylindrical portion which has a leading wall, a downwardly curved top wall, a back wall and side walls which converge is towards the back wall, an inlet in the leading wall containing a louvred element having a plurality of angled louvres arranged so that air entering the hood in a direction substantially normal to the leading wall has imparted to it an initial circular movement in a plane parallel to the bottom wall and perpendicular to the longitudinal direction of the louvres, the housing containing a vane assembly downstream of the inlet.
Patent KR-900008356-B1 (KR)
Title: Oiler
Inventor: GOMUKAI SIGEMI
IPC: G07F15/00
Filed: 1983-12-20
Granted: 1990-11-17
Abstract: The oil supply apparatus comprises an oil supply nozzle (10); a pump (6); a flow meter (7); a nozzle receiving part (11); a switching means for driving the pump when the nozzle is removed from the nozzle receiving part; a preset means for presetting the oil supplying amount or the price to refuel unitl the oil supplying amount or price reaches a preset value; a means for driving the pump for a short time when the nozzle is received in the receiving part; and a safety certfying means for preventing the pump from being driven when the oil counting amount is larger than the presetted amount.
Patent KR-870001877-B1 (KR)
Title: Process for producing benzyl esters of aromatic hydroxycarboxylic acids
Inventor: SSUCHIYA HIROAKI
IPC: C07C69/88
Filed: 1984-02-27
Granted: 1987-10-20
Abstract: Aromatic hydroxycarboxylate benzyl esters are prepd. by reacting aromatic hydroxy carboxylic acid or its lower alkyl ester i.e. para- hydroxy benzoic acid and 4-hydroxyisophthalic acid with benzyl alcohol in the presence of R2Sn=Z, RpSnXq or Ti(OR)4.  In the formula, R, same or not, is C1-4 alkyl; Z=O or S, X=halogen or - OCOR'(R'=C1-11 alkyl); p=2, 3 or 4, q=0, 1 or 2, p+q=4.  When q is 2, both X form a -OCO-R2-COO-[R2=C1-10 (un)satd. alkylene or arylene!. Coboiling substance formative solvent with water is used for the acceleration of dehydration and adjustment of rxn. temp.
Patent KR-890003685-B1 (KR)
Title: Real-time hierarchal pyramid signal processing apparatus
Inventor: CARLSON CURTIS L
IPC: G06F17/10
Filed: 1984-06-27
Granted: 1989-09-30
Abstract: The process for the analysing frequency spectrum of the information component (G0) of the video signal having certain dimensions in (N+1) frequency bands where n is a constant over 2 includes a pipe line having a set of sequentially arranged sampled-signal converters (100- 1,...100-N) for analysing the frequency spectrum during delayed real time.  The converters have the first input terminals (G0,..., Gn), the second input terminals (CL1,..., CLn), the first output terminals (G1,...,Gn), and the second output terminals (L0,...,Ln-1).  The second input terminal of each converter receives divided sampling frequency clock (CL1, ...,CLn).
Patent KR-870001278-B1 (KR)
Title: Gas supplier for optical fiber glass preform
Inventor: DAGIMODO HIROAKI
IPC: C23C16/448
Filed: 1984-12-01
Granted: 1987-06-30
Abstract: A gas supplier with high efficieny is provided.  The supplier is composed of a main tank and an ancillary tank.  The outlet of the ancillary tank is placed in the main tank.  The feedback pipe is diverged from the outlet of the main pipe.  The top of the feedback pipe is placed in the ancillary tank.  The control valves are installed in the feedback pipe and the hub of the outlet of the main pipe and the feedback pipe.  Gas can be pressed into the main tank from the inlet of the main pipe.
Patent KR-910006988-B1 (KR)
Title: Process for production 2-alkoxy aminosulfonyl benzene sulfonylurea
Inventor: SHIOKAWA KOZO
IPC: C07D521/00
Filed: 1985-02-09
Granted: 1991-09-14
Abstract: Novel herbicides are produced by the novel reaction   <IMAGE> <IMAGE>  +TR  <IMAGE>  in which R1, R2 and R3 each independently is lower alkyl of 1 to 4 carbon atoms, and M is an alkali metal atom.
Patent KR-910010246-B1 (KR)
Inventor: INOUE KIYOSHI
IPC: B23H7/00
Filed: 1985-03-19
Granted: 1991-12-24
Abstract: 내용 없음.
Patent KR-890004393-B1 (KR)
Title: Air cooling type absorption cooler
Inventor: KUNUGI YOSHIFUMI
IPC: F25B15/06
Filed: 1985-06-18
Granted: 1989-11-03
Abstract: The cooler has an air cooling type absorber having a structure in which, in cooling the absorbing solution and the refrigerant vapour by air, the absorbing solution and the refrigerant vapour on the inlet side of the absorber are cooled by the cooling air on the outlet side of the absorber.  The absorbing solution on the outlet side of the absorber is cooled by the cooling air on the outlet side.  By causing the absorbing solution sprayed into the absorber to flow downward and the air for cooling the absorbing solution and the refrigerant vapour to flow upward, the absorbing solution is cooled by the air which has a temperature approximately equal to the inlet temperature of the cooling air.
Patent KR-910003129-B1 (KR)
Inventor: BANDO SHIGERU
IPC: B24B9/10
Filed: 1985-07-04
Granted: 1991-05-20
Abstract: 내용 없음.
Patent KR-880001568-B1 (KR)
Title: Pyrazoline derivatives and the process thereof
Inventor: DEGEN ANGELINA JOY
IPC: A01N43/24
Filed: 1985-10-24
Granted: 1988-08-23
Abstract: Pyrazoline derivs. of formula (I) are new.  (I) are prepd. by alkylation of the products obtained by reacting Rc-N=C=W with compd. of formula (II).  In the formulas, RA is (a) [R'A=H, halogen, lower alkyl, lower alkoxy, lower haloalkoxy, lower alkynyloxy or lower haloalkyl ; RB is 4- or 5-substituent of (b) [R'B=H, halogen, lower alkyl, lower alkoxy or lower haloalkyl ; RC is (c) [RD=H or lower alkyl; RE=halogen, lower alkyl, lower alkoxy, lower haloalkoxy, lower haloalkyl, CN, NO2, -NRFRG or -SOnRH; Rf=RG=RH= lower alkyl; n=0-2 ; RN is H or lower alkyl; V and W are each independently  O or S. (I) have excellent insecticidal activities.
Patent KR-950000341-B1 (KR)
Inventor: MITSUYA FUMIO
IPC: G11C16/26
Filed: 1985-11-25
Granted: 1995-01-13
Abstract: 내용 없음.
Patent KR-900008660-B1 (KR)
Inventor: NAITOH MITSUGA
IPC: G06F11/22
Filed: 1985-12-17
Granted: 1990-11-26
Abstract: 내용 없음.
Patent KR-900003699-B1 (KR)
Title: Automatic speed control system of automobile
Inventor: LEE WON-JAE
IPC: B60K31/00
Filed: 1986-04-11
Granted: 1990-05-30
Abstract: A wireless remote speed controller for transmitting the signal of the limited speed is installed at each of road facilities. An automobile with a receiver is controlled by the receiving signal from the wireless speed controller. The signal transmitting circuit includes sixteen flip-flop circuits, a frequency converter, a FM modulator, and an antenna. The signal receiving circuit includes a demodulator, a converter, a latch circuit, fourteen relays, and a buzzer.
Patent KR-880001092-B1 (KR)
Title: 7-rubstituted bycyelie pyrazolidinones and process for preparation of
Inventor: JUNGHEIM LOUIS N
IPC: C07F9/6503
Filed: 1986-04-28
Granted: 1988-06-23
Abstract: The titled compounds (I) and their pharmacentically acceptable salts, useful as antibacterials, are prepared. 2,3di(arylcarboxylate)-7- (R,S)-(t-butoxycarbonylamino)-8-oxodiazabicyclo [3,3,0  octa-2-ene is prepared by reacting 4-(R,S)(t-butoxycarbonylamino)-3-oxo-1- (methylene)-1,2-pyrazolidinium ylide with diarylbutenedioate in anhydrous acetonitrile for 3hr.
Patent KR-890001400-B1 (KR)
Title: Air transfer and mix apparatus for powder
Inventor: SON JAE-IK
IPC: B65G53/04
Filed: 1986-09-29
Granted: 1989-05-02
Abstract: A blender in an air transporting system for powder material comprises a hopper (4) having a shut-off valve (1) and a filter beg (3), a feed screw (S) disposed under the hopper, the other screw (6) rotating in a counter-direction to the feed screw, a paddle (S-1) mounted between the two screws, a blending chamber (10) prepared just under the paddle, and an air nozzle (9) positioned at the rear side of the blending chamber.  The pitches (P1, P2, P3) of the feed screw are designed to be gradually lessened towards the downstream.  The width of the hopper outlet is pref. three times the screw diameter.
Patent KR-940006111-B1 (KR)
Inventor: KOBAYASHI TAKEO
IPC: B23B31/30
Filed: 1986-11-04
Granted: 1994-07-06
Abstract: 내용 없음.
Patent KR-890003072-B1 (KR)
Title: A filtering device in cutting machine
Inventor: UCIYAMA TADAO
IPC: B01D33/06
Filed: 1986-12-15
Granted: 1989-08-21
Abstract: A filter for waste cutting oil contg. chips comprises a mechanism to supply waste cutting oil contg. chips, a filter drum, a guide groove (8) fitted with a stoper (9) placed at the inside of a circular plate of the filter drum and a movable bucket (10) having a chip selection plate with numerous holes movably placed in the guide groove (8).
Patent KR-920009916-B1 (KR)
Inventor: DEAN ROBERT E
IPC: H01L29/43
Filed: 1985-07-03
Granted: 1992-11-06
Abstract: 내용 없음.
Patent KR-900008917-B1 (KR)
Inventor: SUZUKI ATSUSHI
IPC: G11C7/10
Filed: 1987-01-20
Granted: 1990-12-11
Abstract: 내용 없음.
Patent KR-940005463-B1 (KR)
Inventor: PATRON CHRISTIAN S A E
IPC: H05B6/04
Filed: 1987-03-14
Granted: 1994-06-18
Abstract: 내용 없음.
Patent KR-950004611-B1 (KR)
Inventor: RICE RODERT W
IPC: F02C9/42
Filed: 1987-04-10
Granted: 1995-05-03
Abstract: 내용 없음.
Patent KR-890003733-B1 (KR)
Title: Process for yoghourt sterilized
Inventor: HAN YONG-SOO
IPC: A23L2/42
Filed: 1987-06-05
Granted: 1989-10-04
Abstract: The method for preparing sterilized lactobacillus beverage comprises: (a) fermenting the skin milk and adjusting the amount of solid without milk to 2.5-5.0%; (b) adding sugar to the above broth; (c) homogenizing at 30-60 C under the 10-200 kg/cm3 pressure.
Patent KR-950002830-B1 (KR)
Inventor: AUBARD GILBERT
IPC: C07C215/16
Filed: 1987-07-01
Granted: 1995-03-27
Abstract: 내용 없음.
Patent KR-910005032-B1 (KR)
Title: Clock randomizing number board
Inventor: KIM SUNG-DU
IPC: G04C3/00
Filed: 1987-09-17
Granted: 1991-07-22
Abstract: The number board (1) of clock with numbers randomly  arranged sets a clock by the hour, minute and  secodn  on  digital  display (OP)(MP) (SP). The hands (2)(3)(4) on  the  number  board  (1)  are mounted to a stepping motor (M1)(M2)(M3)  for  driving  respective hands. The drive circuit of the clock comprises  a hour hand drive circuit, a minute hand drive  circuit  and  a  second  hand  drive circuit, they are connected to OR-gate (OR1g9having a start button (B4) and an oscillator (OSC).
Patent KR-910000611-B1 (KR)
Title: Multi memory and auto finding circuit
Inventor: HAN HONG-KYU
IPC: G11B15/03
Filed: 1987-10-30
Granted: 1991-01-28
Abstract: The circuit includes a reel  motor  driving  pulse  generator (350) for driving a  reel  motor  according  to  the  signal  from control signal terminals and for generating pulse train, a counter (450) for generating tape run data by counting the pulse train, an address signal generator (550) for selecting address  switches  so that address signal  is  generated,  a  mode  selector  (SW0)  for selecting mode from memory modes, finding mode and normal mode  by user's  selection,  a  multi-finding  memory  (650)  for   storing run-data on output address of the address signal  generator  (550) and for transmitting the stored data as  a  finding  data,  and  a comparator (700) enabled by  finding  mode  selection  so  that  a first, a second, and a third comparator signal are generated.
Patent KR-930010146-B1 (KR)
Title: Picture processing method for fax
Inventor: HAN YONG-JIN
IPC: H04N1/411
Filed: 1987-11-30
Granted: 1993-10-14
Abstract: This invention concerns the image processing method for  high resolution using a half-tone  methods.  The  H.T.  signal  of  the system control part is added to J-K flip flops (10,11) and an H.T. processing part, and the line enable signal is added to the  clock node in J-K flip flop (11). The clock signal is added to AND  gate and J-K flip flop (10) and output of J-K F.F (10) is added to  the other input node of AND gate. The output of F.F (11) is  added  to the line memory (8) and the strobe mode of data selector.
Patent KR-960013447-B1 (KR)
Title: Steroids containing a keto group at position 23, their preparation, their use in the preparation of compounds of the 20-ketopregnane series, and intermediates of this use
Inventor: VIVAT MICHEL
IPC: C07J41/00
Filed: 1987-12-05
Granted: 1996-10-05
Abstract: A compound of the formula    <IMAGE>  I  wherein R1 is hydrogen or methyl, R2 is methyl or ethyl, the A,B,C and D rings optionally have one or more double bonds and are optionally substituted with one or more members of the group consisting of halogen protected hydroxy, 1/8O, alkyl and alkoxy of 1 to 4 carbon atoms and alkenyl and alkynyl of 2 to 4 carbon atoms, R is selected from the group consisting of halogen, -OH, alkoxy of 1 to 6 carbon atoms, aralkoxy of 7 to 15 carbon atoms, alkylthio of 1 to 6 carbon atoms, arylthio of 6 to 14 carbon atoms, aralkylthio of 7 to 15 carbon atoms and   <IMAGE> wherein R3 and R4 are individually selected from the group consisting of hydrogen, alkyl of 1 to 6 carbon atoms and aralkyl of 7 to 15 carbon atoms or R3 and R4 together with the nitrogen atom form another heterocycle optionally containing a nitrogen atom or oxygen atom and their preparation and their use to form 20-keto-pregnanes.
Patent KR-960016845-B1 (KR)
Inventor: NASUDA AKIRA
IPC: H04N5/359
Filed: 1987-12-15
Granted: 1996-12-21
Abstract: 요약없음.
Patent KR-950010459-B1 (KR)
Inventor: TODD CHRISTOPHER J
IPC: G11C8/16
Filed: 1988-01-29
Granted: 1995-09-18
Abstract: 내용 없음.
Patent KR-920000636-B1 (KR)
Inventor: MIKATA UUICHI
IPC: H01L29/49
Filed: 1988-04-14
Granted: 1992-01-17
Abstract: 내용 없음.
Patent KR-950010359-B1 (KR)
Inventor: INOUE YOICHI
IPC: F16D3/28
Filed: 1988-05-06
Granted: 1995-09-16
Abstract: 내용 없음.
Patent KR-920001695-B1 (KR)
Title: Interfacing method between p.c. and fax
Inventor: KIM HAK-SOO
IPC: G06F3/00
Filed: 1988-05-31
Granted: 1992-02-22
Abstract: analyzing interfacing modes upon receipt of key inputs from  a  personal  computer;  inputting picture data into the personal computer, and storing  the  picture data into a data storing section under  a  receiving  and  storing mode; storing coded picture data into a data storing section after receipt of the data from a facsimile under a  text  storing  mode; transmitting the coded data to the facsimile by  withdrawing  them from the data storing section of the  personal  computer  under  a withdrawing and transmitting mode; and decoding and  printing  the coded picture data  by  withdrawing  the  data  from  the  storing section of the personal computer under a withdrawing and  printing mode.
Patent KR-910005470-B1 (KR)
Title: Conference call system
Inventor: PARK JEONG-WON
IPC: H04M3/56
Filed: 1988-08-31
Granted: 1991-07-29
Abstract: The circuit is applicable to the A and μ Law Type  conference communication  method.  32  number  of  the  subscriber   can   be participated in  the  phone  conference  using  the  circuit.  The circuit includes a digital mixer (80) for modulating the PCM audio data of the 32 members of subscribers into the linear PCM data and de-modulating the mixed limear PCM data into PCM data of  A  or μ-Law type, a controller (30) for controlling the digital mixer  to mix the wanted channels, providing the attenuation control  signal to the mixer when the sum of the audio  signals  of  each  channel exceeds certain level, an a/μ law  selectro  (70)  for  providing selection data  of  A  or μ law,  a  logic  module   (90)   for synchronizing the timing of the status data transmitted  from  the controller and the mixed  PCM  data  by  receiving  a  synchronous signal  and  a clock  signal,  an  1-bit  static  RAM  (60)   for compensating the delay in the channel/frame by the output  control signal of the logic module, and a ROM (40) for storing the monitor program and the group information.