baber/WOPTO huggingface dataset:
Patent JO-2285-B1 (JO)
Title: Dihydro-benzo (b) (1.4) dizepin-2-one derivatives as mglur2 antagonists ii
Inventor: MUTEL VINCENT
IPC: C07D417/10
Filed: 2002-04-10
Granted: 2005-09-12
Abstract: This invention is concerned with dihydro-benzo [b] [1,4] diazepin-2-one derivatives of the general formula: Wherein RI, R2, R3, X and Y are as defined in the specification. The invention further relates to med medicaments containing there compounds, a process for their preparations as well as their use for preparation of medicaments for the treatment for the treatment or prevention of acute and/or chronic neurological disorders
Patent KR-800000515-B1 (KR)
Title: Apparatus topurify exhaust gas for multi-cylinder internal combustion engine
Inventor: IRIMAZIRI SHOICHIROU
IPC: F01N3/10
Filed: 1975-12-22
Granted: 1980-06-12
Abstract: Each cylinder of an I. C. V-8 engine is provided with a main combustion chambustion chamber(5) and an auxiliary combusstion chamber(7) connected by a torch opening(6). An exhaust reaction chamber assembly(25) is positioned between the two banks of cylinders(2) and is provided with a liner(28) having a first reaction chamber therein. Four exhaust tubes(24) each connected to receive exhaust gases from two adjcent cylinders(2) project into the reaction chamber.
Patent KR-810001399-B1 (KR)
Title: Process for the continuous casting of liquid polymerizable compositions
Inventor: MORITANI MASAHIKO
IPC: C08F20/14
Filed: 1978-01-14
Granted: 1981-10-19
Abstract: A copolymer syrup from Me methacrylate(I) and acrylate esters contg. bis(4-tertbutylcyclohexyl)peroxydicarbonate(II) is continuously charged to a space between 2 endless belts and 2 tubular gaskets, passed through heating areas at<100oC and 100oC and cooled to give a continious transparent sheet.  Thus, a syrup from 3:97 mixt. of Et acrylate and I contg. 0.001 % azobisisobutyronitrile and 20 % copolymer(III) was mixed with 0.3% II, degassed and charged to an app. described above, heated 11.4 min at 80oC and 4.9 min at 120oC to give a 30-mm sheet of III contg. 0.43% risidual monomer.
Patent KR-810001500-B1 (KR)
Title: Method for introduction of filament strand onto feed of roller of chopped glass filament strands manufacturing system
Inventor: NAKAZAWA K
IPC: C03B37/02
Filed: 1978-07-07
Granted: 1981-10-25
Abstract: The apparatus for making chopped strands of glass filaments comprises (a) the plurality of spinning furnaces(12) positioned parally, (b) applicators (15) for coating lubricant, (c) main guid rollers(19) for introducing fiber strand(17) to feed roller(21), (d) a main feed roller(21) for winding-up the fiber strand, wherein the surface of the feed roller is made from polyurethane rubber; wherein the glass strand is drawn only by frictional contacting with the surface of the main feed roller(21), and (e) a cutting roller to cut the glass strand by constant length.
Patent KR-830002136-B1 (KR)
Title: 선택적으로 침탄되고 단조된 저합금철계 분말 금속부품의 제조방법
IPC: B22F5/08
Filed: 1979-05-31
Granted: 1983-10-15
Abstract: 내용 없음.
Patent KR-810000309-B1 (KR)
Title: Method for producing azonitrile compositions
Inventor: CHOI MYUNG JAI
Filed: 1979-08-31
Granted: 1981-04-09
Abstract: Azonitrile compds. (I; R1,R2,R3,R4 = methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, neobutyl, cyclopropyl, cyclopentyl, or phenylisopropyl) were manufd. by the oxidation of hydronitrile with hydroperoxide.  Thus, MIBK and hydrazine sulfate were reacted with sodium cyanate in room temp. for 4 days to give 1,2-di-(1-isobutyl-1-cyano)-ethyl-hydrazine, which was added with hydrazine peroxide to give the title compds.
Patent KR-820000540-B1 (KR)
Title: Power drawbolt with planetary drive
Inventor: KIRKHAM E
IPC: B23B31/28
Filed: 1979-12-06
Granted: 1982-04-13
Abstract: The drawbolt is rotatably mounted within the spindle of a machine tool to secure a toolholder to a socket in the front end of the spindle.  Two spur gears are formed on the rear end of the spindle and drawbolt, respectively, and are positioned side by side.  The two spur gears are equal in diameter, but have differing numbers of teeth.  A planetary gear cage surrounds the spur gears and has pinion gears which are meshed with both spur gates.  The planetary gear cage is attached to the armature of an electric motor which rotates the cage and causes rotation of the drawbolt at a reduced speed.
Patent KR-830001219-B1 (KR)
Title: 메탄, 비메탄 탄화수소 측정방법
Filed: 1980-02-12
Granted: 1983-06-24
Abstract: 내용 없음.
Patent KR-840000869-B1 (KR)
Title: Locking device
Inventor: GOTANDA MOTOHIRO
IPC: E05B45/12
Filed: 1980-08-22
Granted: 1984-06-20
Abstract: As a locking device for a doorknob, a dead bolt is used that is divided into two parts. Locking or unlocking the door can be done by using the lead switch fitted on the pillar of the house being protected. In the system, the source of electric power which connected to the doorknob is supplied by turning the knob, which saves energy.
Patent KR-820000970-B1 (KR)
Title: Process for the preparation of a-oximino-a-haloketones
Inventor: KIM Y
Filed: 1981-03-20
Granted: 1982-05-31
Abstract: Title compds. (I; R = Me, Et, n-Pr, iso-Pr, n-Bu, ter-Bu, benzyl, phenyl, phenoxymethyl; X = Cl, Br, I), useful as intermediates for preservative agents of paper and pulp, were prep. by reaction of α-haloketone (II) and alkylthionitrite (III; R1 = n-Bu, ter-Bu) in the presence of HCl (gas) and organic solvent. Thus, 500 mg II(R = Me; X =Cl) and 974 mg III(R1 = ter-Bu) in Et2O reacted with HCl for 3 hr to give 513 g I.
Patent KR-900008876-B1 (KR)
Inventor: SHAW HERBERT J
IPC: G01B9/02
Filed: 1982-03-31
Granted: 1990-12-11
Abstract: 내용 없음.
Patent KR-880000649-B1 (KR)
Title: Multiple tone pirot signal system
Inventor: LOUGHLIN BERNARD D
IPC: H04H1/00
Filed: 1982-05-03
Granted: 1988-04-19
Abstract: In the stereo radio system, tones are modulated on a carrier wave which is also multiplex modulated by stereo related audio signals. Detection of the presence of one of the tones in a received signal provides an indication of the possibility of stereo related modulation components in the received signal. Detection of the presence of both tones in the received signal provides confirmation that stereo related modulation components are in the received signal.  In one form, 15HZ and 30HZ phaserelated tones are used.  A stereo receiver incorporates 15HZ and 30HZ phase detectors which form interrelated phase-locked 100ps with a common 30Hz reference oscillator.
Patent KR-900001147-B1 (KR)
Title: Head servo circuit
Inventor: ITTO KENJI
IPC: H04N5/783
Filed: 1982-09-06
Granted: 1990-02-27
Abstract: The appts. has rotary heads for reproducing a video signal recorded on tracks formed obliquely with respect to the longitudinal direction of a magnetic tape, a motor for rotating the rotary heads, and a magnetic tape travelling circuit.  The head servo circuit comprises a detecting circuit for detecting the rotation of the motor and producing a signal in accordance with the detected rotation.  A reference frequency signal generating circuit generates a reference frequency signal and a phase comparing circuit compares phases of the reference frequency signal generated by the reference frequency signal generating circuit and the signal from the detecting circuit.
Patent KR-890000418-B1 (KR)
Title: Azetidines and preparation process thereof
Inventor: BREUER HERMANN
IPC: C07D413/12
Filed: 1982-12-31
Granted: 1989-03-17
Abstract: 3-Amino-2-oxoazetidine-1-carboxamide derivs. of formula (I) or their salts are prepd. by reacting β-lactam of formula (II) with isocyanate of formula (III).  In the formulas, R1 is acyl; R2 is H or methoxy; R3 and R4 are each H, alkyl, alkenyl, cycloalkyl, aryl, or 5,6 or 7 cyclic hetero ring; R5 is H, alkyl or aryl; R6 is H, alkyl, aryl, 5,6 or 7 cyclic hetero ring, -NR7R8 or (CH2)nX[n=1-4; x=halogen, aryl, alkoxy or aryloxy; R7=R8=H, alkyl or aryl .  (I) and their salts are useful as antibacterial agents.
Patent KR-910004666-B1 (KR)
Inventor: CHANG JOHN C
IPC: C07C279/18
Filed: 1983-11-09
Granted: 1991-07-09
Abstract: 내용 없음.
Patent KR-860002087-B1 (KR)
Title: Automatic response system for telephone
Inventor: AN BYONG-GIL
IPC: H04M1/64
Filed: 1983-11-30
Granted: 1986-11-24
Abstract: When a recipient is absent, this device records the message of the sender, monitors from outsides or performs preassigned functions according to each mode (message, response revival, response set, two way and outside recording mode etc.) This telephone is composed of a telephone circuit part(1) discriminated ring signal and message signal and microprocessor(2) and analog switching part done circuit at each mode, and selecting circuit(4) voice synthesizer (5) motor driving unit(6) detecting circuit part(7) and head part and audio amplifier(9) and speaker(10).
Patent KR-910005412-B1 (KR)
Title: Process for preparing spsticipial nitromethylene derivatives
Inventor: HARRIS MARTIN
IPC: C07D309/00
Filed: 1984-02-15
Granted: 1991-07-29
Abstract: Substituted 2-nitromethylene-tetrahydro-2H-1,3-thiazines of formula:in which n is 0 or 1; m is 0 or 1; X is oxygen or sulphur; and R is alkyl, alkenyl or alkynyl optionally substituted by one or more of the same or different substituents selected from halogen atoms and hydroxy, thiol, acyloxy, acylthio, alkoxy, alkoxyalkoxy, haloalkoxy, and optionally substituted phenyl groups; have useful pesticidal properties.
Patent KR-890001347-B1 (KR)
Title: Burner
Inventor: WARD TREVOR
IPC: F23D11/40
Filed: 1984-03-29
Granted: 1989-04-29
Abstract: The burner has a body (1) which defines a passage (2) forming in part a flow path for gases between two openings (3.4). One opening (4) serves either as an inlet for receiving air for combustion with the fuel in a combustion chamber (16) in one mode of operation, or as an outlet for discharging waste gas from the passage in an alternative mode.  The second opening (3) serves as an outlet for combustion products in the one mode of operation or as an inlet for receiving waste gas in the alternative mode.  An assembly (5) injects fuel and air into the passage and the fuel and air first mix in a nozzle (31) with the fuel being ignited by an electrode (47).  The fuel is combusted in a pre-combustion chamber (32) before entering the main combustion chamber.  The fuel is partially or fully pre-combusted irrespective of the mode in which the burner is opeating to avoid prepurging with air or re-ignition between flue and firing cycles.
Patent KR-910002564-B1 (KR)
Title: Process for the preparation of hexa hydro pyrrolo (2,1-a) isoquinoline derivatives
Inventor: MARYANOFT BRUCE E
IPC: C07D491/147
Filed: 1984-06-23
Granted: 1991-04-26
Abstract: Novel compounds are disclosed, which are derivatives of 1, 2, 3, 5, 6, 10b-hexahydropyrrolo [2, 1-a]- isoquinolines, represented by general formula (I): <CHEM> as well as pharmaceutical compositions and methods for the treatment of depression in warm-blooded animals, e.g., man. Novel intermediates are also part of the invention.
Patent KR-890003205-B1 (KR)
Title: Disk automatic exchanger
Inventor: SIMBO TAKAO
IPC: G11B17/30
Filed: 1984-08-16
Granted: 1989-08-26
Abstract: A disc transferring mechanism moves alongside the bank of upright discs and transfers a disc held at a predetermined position on the disc storage section to the disc playback section.  A wire whose ends are attached to the disc transfer mechanism prevents the discs held in the disc storage tray from falling out except for the disc being transferred.  As the disc transfer mechanism moves along the disc storage tray the disc fall out prevents mechanism is rocked against a bias so that the bias is overcome by the disc to be played.  This disc rolls into a port in the disc transfer mechanism.  The wire is controlled by a guide as the disc transfer carriage moves.
Patent KR-900000824-B1 (KR)
Title: Temperature measuring device of heating system
Inventor: WOLPHGANG KURUT
IPC: A47J27/62
Filed: 1984-11-12
Granted: 1990-02-17
Abstract: Arrangement for the temp. measurement in a heating system comprises a cooking pan with food placed on a hotplate by which the temp. of the food in the cooking pan is measured.  The cooking pans (10,10') are provided with circular surrounding radiating surfaces (12,12') in the transition area from the bottom (11,11') of the cooking pans and the pan wall.  A radiation sensor (30) with focusing device is orientated to the hotplate (21,23) and is arranged at a distance to the radiating surface which corresponds to the distance between the neck (35) in the radiation measuring field of the radiation sensor and the inlet surface (31) of the radiation sensor.
Patent KR-890003110-B1 (KR)
Title: System for interlocking closely ajacent vertical lengths of tube in a heat exchanger having loops
Inventor: FOURNIER JEAN
IPC: F22B37/20
Filed: 1984-11-24
Granted: 1989-08-22
Abstract: Tubes form loops between an inlet and an outlet in which the tubes are suspended from a rigid structure by the inlet and outlet. Starting from the middle lengths, each length is provided with a hollow member (12) projection on its side towards the outside with a hollow member (12) projecting on its side towards the outside of the handle, welded to the tube along two generator lines (14), and resting against the outer face of the adjacent length.  A projecting lip (18) depends from the tube while the adjacent length is provided with an opposite member likewise welded to it along two generator lines.
Patent KR-930000848-B1 (KR)
Inventor: HULL SCOTT A
IPC: E05B55/12
Filed: 1984-12-20
Granted: 1993-02-06
Abstract: 내용 없음.
Patent KR-880000673-B1 (KR)
Title: Controlling circuit of stepping motor
Inventor: LEE JU-IK
IPC: H02P7/00
Filed: 1985-05-23
Granted: 1988-04-20
Abstract: This invention is concerned with the control circuit of step motor which is used for precise position control.  When the control system controlled by step motor (3) is arrived at the initial position, the posiiton sensing device (1) detects it accurately.  And as the remaining opposite directional signal is not applied to step motor by the detecting signal of initial position, the control system is set in the initial position easily and also the manipulation of initial position is easily performed.  It is not necessary to interpolate the initial position in spite of a long use.
Patent KR-880001542-B1 (KR)
Title: Low solids content coal tar hased impreganting pitch
Inventor: CHU ARTHUR S
IPC: C10C1/00
Filed: 1985-07-04
Granted: 1988-08-20
Abstract: The method of obtaining a coal tar based pitch characterised by having a quinoline insoluble QI content of less than 0.5% and enhanced impregnation property comprises (a) selecting coal tar oil feedstock having; (i) a distillation residue at 355 deg.C greater than 30 wt.%; (ii) a QI less than 0.5 wt.%; and (iii) a filtration rate through 4 Whatman filter paper of 500g in 30 seconds; (b) heating the feedstock to a temp. of 150 deg.-390 deg.C; and (c) oxidising and stripping the feeedstock until; (i) an ASTM D3104-77 softening point of 90-150 deg.C; (ii) a coking value of at least 45 wt.% according to ASTM D2416-73; and (iii) a flashpoint of at least 200 deg.C according to ASTM D92-72 are obtained.
Patent KR-890003257-B1 (KR)
Title: An industrial robot
Inventor: TADA HARUO
IPC: B25J17/02
Filed: 1985-07-18
Granted: 1989-08-31
Abstract: In use of a robot dust may be produced from engaging gears (15), motor brushes and bearings (18,19,20,21).  To prevent that dust from escaping to the exterior the dust-producing parts are shielded by a cover (22) and by members (16,17).  Any dust produced passes through the bearings (18,19) and into the air passages (23,24).  Air containing any dust is discharged through exaust flow paths provided by pipe (33,34).  The throttles (25,26) have small clearances in which air is compresed as it is drawn in from the external atmosphere.  The resulting increased pressure prevents the flow of dust-carrying air from the interior of the robot to the external atmosphere.
Patent KR-890000934-B1 (KR)
Title: Elevator for coffin
Inventor: PARK JAE-HWAN
IPC: B66B7/00
Filed: 1985-12-09
Granted: 1989-04-14
Abstract: An elevator passageway which is designed to save the space for a lift carbin is constructed large enough to keep a room (3) for a coffin (6).  Two balance weights (8,8') may be mounted on the spaces (7,7') remained at both sides of the room (3), and a Ushaped bracket (9) is prepared to surround the room (3) and to guide the balance weights. Each balance weight is hung by a separate rope (16,17) through a pair of upper and lower guide sheaves (14,14',15,15').
Patent KR-890002630-B1 (KR)
Title: Shell crusher of hard shell seed
Inventor: YOSHIHARA MASAZUMI
IPC: B02B3/00
Filed: 1986-01-21
Granted: 1989-07-21
Abstract: The device crushes any rinds of fruits without much collapse or damage of the contents.  The structure comprises an accepting plate (6) in the exit of the hopper (5), a setting pipe (7), a shooting barrel (1), and an air compressed tank (2).  A pad plate (9) that collides with the shot rind of fruits is positioned at the opposite side of the air tank (2).  Thus fruits are shot into the crash room (8) by the compressed air, and are crashed.  Hence the apparatus has advantages such as the complete peeling officiency, the miniaturization of the system and the controlability of air amount according to the amount of fruits.
Patent KR-900003518-B1 (KR)
Title: Multiport axial valve with balanced rotor
Inventor: SCHUMANN GARY M
IPC: F16K11/06
Filed: 1986-02-10
Granted: 1990-05-21
Abstract: Conduits to be interconnected are attached to a hollow stationary body, or stator assembly, which is comprised of three sections, or elements, each of which is cylindrical in exterior form. There are fluid flow paths in a rotating body, or rotor assembly, which is located inside the stator assembly. The rotor assembly assumes various positions according to the cycle steps and distributes fluid flowing into and out of the valve in a different manner in each cycle step. There are space between the rotor and stator assemblies which contain seals for prevention of leakage and definition of folw passages.
Patent KR-950002489-B1 (KR)
Inventor: BOALS WAYYNE S
IPC: F16K31/385
Filed: 1986-03-28
Granted: 1995-03-20
Abstract: 내용 없음.
Patent KR-970009099-B1 (KR)
Inventor: HOLDER JR CLINTON HAYS
IPC: G11C11/408
Filed: 1986-01-31
Granted: 1997-06-05
Abstract: 내용 없음.
Patent KR-950002651-B1 (KR)
Inventor: VRIENS LEENDERT
IPC: H04N9/31
Filed: 1987-03-23
Granted: 1995-03-24
Abstract: 내용 없음.
Patent KR-940005311-B1 (KR)
Title: Electric razor
Inventor: OPRACH KLAUS
IPC: B26B19/02
Filed: 1987-03-28
Granted: 1994-06-16
Abstract: An electric shaving apparatus has a housing serving as a hand grip (1) with projecting support lugs (11, 12) that defines pivot axis (Z). Shearing head system (2) is movable about pivot axis (Z) and comprises a shearing head frame (3) that has at least one upper cutter (4) with arcuate extensions towards the longitudinal sides (5, 6) of the shearing head frame (3), and at least one under cutter (25, 26, 34) driven by a motor and in cooperative relation with the upper cutter (4). The shearing head system (2) is arranged to pivot about the pivot axis (Z) in such a manner that the shearing area usable for shaving will engage the skin surface and not become disengaged from the skin surface as directions of sliding movement of the shearing head system change.
Patent KR-930001979-B1 (KR)
Inventor: AKAIKE SEIJI
IPC: F16J15/32
Filed: 1987-08-25
Granted: 1993-03-20
Abstract: 내용 없음.
Patent KR-950011912-B1 (KR)
Inventor: OMAE TADAYUKI
IPC: C08L23/08
Filed: 1987-08-27
Granted: 1995-10-12
Abstract: 내용 없음.
Patent KR-950011705-B1 (KR)
Inventor: HERMANN KENNETH W
IPC: H01J9/24
Filed: 1987-08-31
Granted: 1995-10-07
Abstract: 내용 없음.
Patent KR-910009418-B1 (KR)
Title: Method of sawing wafer chip
Inventor: JO SONG-HWAN
IPC: H01L21/302
Filed: 1987-10-16
Granted: 1991-11-15
Abstract: The method prevents the damage of internal  circuit  and  the discoloring of pad in the wafer-chip cutting. The method comprises various processes such as taping for attaching tape on  the  wafer backside after mounting the wafer on chuck; sawing for  using  D.I water for the blade cooling, separating die on the  wafer  by  the blade rotation; high-pressure  water  cleaning  for  removing  the silicon dust attached on  the  die  pad  in  sawing.  The  die  is separated from wafer by the blade rotation, while maintaining  the constant-pressure of D.I water contained water soluble  gas  (CO2) and the constant-cutting speed of the blade.
Patent KR-910001953-B1 (KR)
Inventor: KUBO DOYOHIDE
IPC: G11B23/087
Filed: 1987-11-04
Granted: 1991-03-30
Abstract: 내용 없음.
Patent KR-970007431-B1 (KR)
Inventor: SUZUKI TOGI
IPC: D01F6/84
Filed: 1988-01-21
Granted: 1997-05-08
Abstract: 내용없음.
Patent KR-950010716-B1 (KR)
Inventor: CLARK ROBERT E
IPC: C21D9/50
Filed: 1988-01-30
Granted: 1995-09-22
Abstract: 내용 없음.
Patent KR-960011046-B1 (KR)
Inventor: VISCA MARIO
IPC: C09K23/00
Filed: 1988-02-26
Granted: 1996-08-16
Abstract: 내용 없음.
Patent KR-960000859-B1 (KR)
Inventor: TSUNASHIMA GENJI
IPC: C08J7/044
Filed: 1988-03-16
Granted: 1996-01-13
Abstract: 내용 없음.
Patent KR-960003193-B1 (KR)
Inventor: TOSAKI CHIKAO
IPC: G01N11/10
Filed: 1988-04-23
Granted: 1996-03-06
Abstract: 내용 없음.
Patent KR-910005135-B1 (KR)
Inventor: JENNRICH CARLETON E
IPC: C14B1/58
Filed: 1988-07-16
Granted: 1991-07-23
Abstract: 내용 없음.
Patent KR-960003812-B1 (KR)
Inventor: MAJETTE MARK W
IPC: B41J2/51
Filed: 1988-07-22
Granted: 1996-03-22
Abstract: 내용 없음.
Patent KR-910004561-B1 (KR)
Title: Clip for flanges of forms in formworks
Inventor: MAIER JOSEF
IPC: E04G17/04
Filed: 1988-07-26
Granted: 1991-07-06
Abstract: A clip for abutting marginal flanges of forms for formworks which are used for the pouring of concrete has a cylindrical housing for two slidable arcuate clamping elements at opposite sides of a radially extending recess for the flanges. A wedge is movable between those end portions of the clamping elements which are remote from the recess to urge the elements against the exposed sides of the flanges. The wedge can be slidably coupled to the clamping elements so that it can urge the elements against or disengage the elements from the flanges in the recess.
Patent KR-910005260-B1 (KR)
Title: Apparatus parch sesame
Inventor: HONG KI-SANG
IPC: A23N12/08
Filed: 1988-09-20
Granted: 1991-07-24
Abstract: The apparatus for parching sesame includes a fixed  body  (4) united with a gear box (5) and cylinder (7) into an integral  body and a interlocking shaft (9)  mounting a  interlocking  gear  (10) interlocked with the worm-gear (8) of gear shaft  (6).  The  mount frame (11) mounted on the upper part of  the  fixed  body  (4)  is formed with an axial hole portion  and  an  outlet  and  mounts  a electric heater (15) mounted on the  interlocking  shaft  (9)  for heating box (13) on lower part. The box (13)   includes  a  hopper (16) with the hole (14') in the middle parts of  the  upper  parts and a heating cover (14).
Patent KR-910009531-B1 (KR)
Title: Optic system of lens
Inventor: HONG JUN-YOUNG
IPC: G03B5/00
Filed: 1988-11-08
Granted: 1991-11-21
Abstract: The system for 35 mm  single-lens  reflec  cameras,  has  the first group with divergent-refracting function and the second  and third groups  with  convergent-refracting  function  in  order  to satisfy various conditions in focal length. The system comprises a divergence meniscus having the  concave  surface  for  facing  the object, a connecting lens with double-convex  and  double-concave, another divergence meniscus, a  convergence  meniscus  having  the convex surface for facing the object, a divergence meniscus with a connecting lens, a divergence meniscus having the concave  surface for facing the object the lenes being arranged  sequentially  from the object. If respective absolute values of focal length in three groups are f1,f2,f3, the values satisfy the condition such as  4f1 < f2 < 5f1 and 1.5f1 < f3 < 2.4f1.
Patent KR-960006288-B1 (KR)
Inventor: ROBINSON JOHN R
IPC: A43B5/00
Filed: 1989-01-26
Granted: 1996-05-13
Abstract: 내용 없음.
Patent KR-910010244-B1 (KR)
Inventor: OZAWA YASUO
IPC: B24B13/00
Filed: 1989-04-07
Granted: 1991-12-24
Abstract: 내용 없음.
Patent KR-920001612-B1 (KR)
Inventor: BENN RAYMOND C
IPC: B22F3/14
Filed: 1989-05-01
Granted: 1992-02-20
Abstract: 내용 없음.