baber/WOPTO huggingface dataset:
Patent KR-900004620-B1 (KR)
Title: Optical information reproducing apparatus
Inventor: TANAKA SINGICHI
IPC: G11B7/09
Filed: 1987-01-15
Granted: 1990-06-30
Abstract: The optical information reproducing apparatus includes a photodectector with four photocells. Output signals of two photocells are delayed for a specified time. Output signals of the two delaying circuits and the other photocells are added. A phase comparator produces a tracking error signal from a phase difference between output signals of the two adders. Alternatively, a phase comparator produces a phase difference between the output signals of two photocells, and/or another comparator produces a phase difference between the output signals of the remaining photocells.
Patent KR-900002813-B1 (KR)
Title: Transmitter driving for programmable remote control transmitter
Inventor: SOGAME AKIRA
IPC: H03J1/00
Filed: 1987-02-06
Granted: 1990-04-30
Abstract: The transmitter driver receives codes for remote-controlling various electric devices in the learning mode and for remotecontrolling the devices according to the received remote control codes in the remote control mode.  The driver has an output transistor for driving a transmitter constituting a part of a load upon reception of electrical pulses representing the remote control codes.  A resister arranged between the output side of the output transistor and a given reference potenital is provided with control transistor, whose output electrodes are arranged between one end of the resistor at the side of the output transistor and the reference potencial.
Patent KR-890003535-B1 (KR)
Title: Motor controller
Inventor: YANG SUNG-HUI
IPC: H02P1/00
Filed: 1987-03-07
Granted: 1989-09-23
Abstract: The method for protecting the motor from the overheat caused by the motor current comprises: (a) determining the heat limit coefficient (L) and the heat resistance efficient (R); (b) calculating the equation CT1=R∫0T1I2dt when the detected current (i) is 115% of the rate current, CT2=R∫0T2(i-i100)2 when the i is between 100% and 115%, or CT3=R∫f(i115-i)2 dt when the i is less than 100% where i100  is 100% value of the rate current and i115 is 115%,.  The CT1  is added to the present heat value rate but if the sumnred value of CT2 is 60% less than the L, the CT2 is not added any more.  The CT3 is subtracted from the present heat value; (c) releasing the relay (Ra) of the power supply if the added/ sultracted value is greater than the L.
Patent KR-900000035-B1 (KR)
Title: Method for producing refractory-coating materials
Inventor: LEE DONG-HWI
IPC: C04B14/38
Filed: 1987-04-30
Granted: 1990-01-18
Abstract: A refractory coating material consists of 100 wt.% burnt plaster, 128-159 wt.% insulating material (e.g. vermiculite, diatomite), 400- 1000 wt.% inorganic fiber (e.g. rock wool, glass fiber, whisker) and a little additives.  The coating surface has a good crack-resistance and tensile strength.
Patent KR-890003734-B1 (KR)
Title: Process for making powder with vegetable flavor
Inventor: SIN JAE-IK
IPC: A23L27/00
Filed: 1987-05-22
Granted: 1989-10-04
Abstract: A mixt. contg. 30kg garlic, 150kg onion, and 400kg palm oil was blended for 10 min at room temp. and boiled again at 30 mmHg and 105≰C for 50 min.  The resulting mixt. was cooled, extracted, and mixed again with a mixt. contg. 280kg maltodextrin, 0.7kg gum arabic, 2kg salt, 48kg casein, 5kg K2HPO4, and 3 kg fat to give 670 kg powder having a vegetable flavor.
Patent KR-950002148-B1 (KR)
Title: Sustained-release multi-granule tablet
Inventor: ANDO HIDENOBU
IPC: A61K9/52
Filed: 1987-08-05
Granted: 1995-03-14
Abstract: A sustained-release multi-granule tablet is obtained by compressing sustained-release granules, which contains a basis, and a formulation adjuvant. Each of the granules has been coated in advance with a layer of the formulation adjuvant and/or a layer of a mixture of the formulation adjuvant and the basis. The tablet releases an active substance at a suitable velocity into the digestion tract, resulting in that the inbalance in the absorption of the drug in each patient and among individual patients is minimized to achieve maximum bioavailability.
Patent KR-910006725-B1 (KR)
Inventor: VESLEY GEORGE F
IPC: C09J7/10
Filed: 1987-12-31
Granted: 1991-08-31
Abstract: 내용 없음.
Patent KR-970003321-B1 (KR)
Inventor: NAKAZAWA TAKUICHIROU
IPC: G06F15/16
Filed: 1988-03-28
Granted: 1997-03-17
Abstract: 내용없음.
Patent KR-100187905-B1 (KR)
Inventor: SUZUKI MASAYUKI
IPC: G11B17/03
Filed: 1988-05-24
Granted: 1999-06-01
Abstract: 내용 없음.
Patent KR-900006844-B1 (KR)
Title: Treatment chait assembly
Inventor: BEACH RAYMOND D
IPC: A61G13/02
Filed: 1988-05-25
Granted: 1990-09-22
Abstract: The chair or couch for supporting a patient during a dental or medical examination, consists of an upper part (1) and a lowr part (2). When being used by a patient the upper part (1) lies horizontally over the lower part (2). The lower part contains the chair actuating mechanism and equipment for supplying the dentist's instruments (5). In order to provide easy access to the interior of the lower part of the chair, in the event of repairs being needed, the upper part is attached to the lower part by links, which enable it to be swung upwards away from the lower part.
Patent KR-930009228-B1 (KR)
Title: Reel driving method and apparatus of vcr
Inventor: HWANG HAK-SON
IPC: G11B15/44
Filed: 1988-06-30
Granted: 1993-09-24
Abstract: In a reel driving method to transfer the proper torque to the receiving and the supplying reel of VCR. The method comprises  the steps of: setting idler A,B gears  (48)(55)  to  engage  with  the receiving and the supplying reel at each side of the center  gear, rotating a supplying reel (39) clockwise in review and high  speed front review modes; and separating idler A gear from the receiving and the center gear instead of idler  B  gear  engaging  with  the supplying reel in backward high speed review  mode;  and  rotating the receiving reel conter-clockwise by  greater  torque  than  the torque to rotate the receiving reel in idler B gear engaging  with the supplying reel in backward high speed review mode.
Patent KR-900007093-B1 (KR)
Title: The manufacturing method of imitation pearl for ornament
Inventor: KWON HYUK-CHEOL
IPC: A44C27/00
Filed: 1988-07-13
Granted: 1990-09-28
Abstract: An imitation pearl for an ornament is manufactured by coating an ornament body of sythetic resin or glass with a lacquer mixed with a pearl pigment, grinding the coated film of the pearl surface with a fine powder, and re-coating the pearl with a transparent lacquer. The fine powder is pref. mica, talc, basic lead carbonate or bismuth salt.
Patent KR-960010977-B1 (KR)
Title: Pulse oximeter plethysmograph system
Inventor: HOOD JR RUSH W
IPC: A61B5/1455
Filed: 1988-10-08
Granted: 1996-08-14
Abstract: A pulse oximeter is provided including two light (62, 64) emitting diodes. Each LED is energized by a unique modulation signal. Light produced by the LEDs passes through the tissue of a subject and is detected by a photodiode (60). The photodiode signal is separated by tuned circuits (72, 74) resonant at the two modulation signals frequencies and physiological information signals are recovered from the separated signals by amplitude demodulation (100, 102). The inventive arrangement provides identification of back-to-back coupled LEDs and narrow band filtering for good noise immunity.
Patent KR-0141607-B1 (KR)
Title: Multifocal optical device
Inventor: COHEN ALLEN L
IPC: G02C7/06
Filed: 1988-11-10
Granted: 1998-07-01
Abstract: A multifocal ophthalmic lens having diffractive power has a central zone and a plurality of peripheral annular concentric zones. The peripheral zones include a stepped facet, each stepped facet having an outer corner with at least one outer corner being defined by a smooth curve. At least one inner corner can also be defined by a smooth curve. The facet profile preferably varies smoothly without discontinuities. <IMAGE>
Patent KR-930012240-B1 (KR)
Title: Apparatus for controlling damper of refrigerator and controlling method threrof
Inventor: YUN YONG-RO
IPC: F25D17/00
Filed: 1989-04-27
Granted: 1993-12-24
Abstract: The  apparatus  and  method  controls  the  damper  of   the multi- purpose chamber, used for ice-making, cooling or fermenting, according to user's needs, in refrigerators.  The  damper  control apparatus comprises  means  (R11-R16)  generating  electriv  power corresponding to the opening degree of the damper by coupling with an one-directional rotary motor; a plurality of selection switches (SW1- SW4);  means  recognizing   the   switch   selection;   means generating a control signal according to the  selected  switch;  a temp. sensor; a means (IC1) comparing the control signal with  the sensed temp.; a  means  determining  the  opening  degree  of  the damper; a means generating a motor drive control signal.
Patent KR-920001514-B1 (KR)
Inventor: DOER JWIREUGEN
IPC: C01B/
Filed: 1989-06-29
Granted: 1992-02-15
Abstract: 내용 없음.
Patent KR-920007217-B1 (KR)
Inventor: YOSHIDA SHINICHI
IPC: B41J2/485
Filed: 1989-09-23
Granted: 1992-08-28
Abstract: 내용 없음.
Patent KR-930003557-B1 (KR)
Inventor: SAKAI HIDEO
IPC: H01L27/088
Filed: 1989-12-12
Granted: 1993-05-06
Abstract: 내용 없음.
Patent KR-930008380-B1 (KR)
Title: Corespun yarn friction spinning apparatus and method
Inventor: MONTGOMERY TERRY G
IPC: D03D15/12
Filed: 1989-12-22
Granted: 1993-08-31
Abstract: A friction spinning apparatus includes a draw frame section 20, 21, 22, 25 with an entrance trumpet 23 including first and second fiber sliver guiding passageways 39, 40 for forming a three component corespun yarn 10. One of the guiding passageways 40 directs a core roving 11 into the draw frame section 20, 21, 22, 25 while the other sliver guiding passageway 39 directs a core wrapper sliver 12 into the draw frame section so that the core wrapper fibers 12 surround the core fibers 11. Outer sheath fibers 13 are then wound about the core 11 and core wrapper fibers 12 in an elongated throat extending between a pair of rotating suction drums 26, 27.
Patent KR-920007487-B1 (KR)
Title: Universial signal transceiving circuit pack
Inventor: KIM DOK-HWAN
IPC: H04M3/22
Filed: 1989-12-26
Granted: 1992-09-04
Abstract: The  signal  transmission  inspecting  circuit  inspects  the signal transmission state by comparing output  R2  multi-frequency compelled signal (MFC), dual tone  multi-frequency  signal,  audio signal from a ROM, feedback data signal from a switch  network  to reference data. The circuit includes a counter (5) for  generating compare instruction to a  first  comparator  (2)  with  a  certain period, a first comparator (2) for comparing the output data of  a ROM with a first reference data, a parallel  to  series  converter (7) for transmitting ROM data to a switch  network,  a  series  to parallel converter (3) for converting series  feedback  data  from the switch network  to  parallel,  a  second  comparator  (4)  for comparing the feedback data to a second reference data, and an  OR gate (8) for adding the output signal of the comparators.
Patent KR-920001768-B1 (KR)
Title: Process for preparing cromone carboxylate
Inventor: KIM SANG-HO
IPC: C07D311/22
Filed: 1989-12-29
Granted: 1992-03-02
Abstract: A process for preparing chromone carboxylate of  formula  (I) comprises (a) halobenzene of formula (II) or its  nuclear  substd. derivs. with oxaloacetic acid of formula (III) or its salts in  an organic solvent at  20-80  deg.C,  and  (b)  cyclizing  the  obtd. intermediate of formula (IV) in the presence of an acid  catalyst. In the formulas, X=Cl, Br or F; R1 and R2 each = H or C1-4  alkoxy or alkyl; M=H or Na; R'=H or C1-3 alkyl. Pref. the organic solvent is chloroform, benzene, dioxane or toluene.
Patent KR-920007129-B1 (KR)
Inventor: ARIMOTO HIRONOBU
IPC: H01J11/50
Filed: 1990-02-08
Granted: 1992-08-27
Abstract: 내용 없음.
Patent KR-100189033-B1 (KR)
Inventor: BUERUNAA BUREEMU
IPC: F16K31/06
Filed: 1990-04-06
Granted: 1999-06-01
Abstract: 본 발명은 복좌식의 전자밸브의 관한 것으로, 이 전자밸브의 밸브체(24)가 전자석의 가동자이고, 상기 전자밸브가 박판제의 케이싱 주위벽(10)내에 배치되어 있으며, 이 케이싱 주위벽이 플라스틱 사출성형에 의해 코어(18) 및 전기적인 접속부와 함께, 상기 플라스틱내에 매입되어 케이싱을 형성하고 있으며, 또한, 압력매체 통로(32 내지 38)를 구비한 접속부분(16)이 설치되어 있고, 이 경우 이 접속부분과 상기 코어(18)내에 배치된 플라스틱제의 접속통로(22)사이에 상기 밸브체가 위치하고 있는 형식이므로, 비교적 적은 수의 구성 부분밖에 필요로 하지 않는다.
Patent KR-930002445-B1 (KR)
Title: Digital multimeter driving system installed barflashing function
Inventor: HWANG TAE-JIN
IPC: G01R13/06
Filed: 1990-04-28
Granted: 1993-03-30
Abstract: The apparatus performs bar flashing function in  overflow  or overload condition using a sail  chip  to  display  the  condition visually and reduce the cost of manufacturing. And it uses  not  a separated encoder but track to generate the  data  concerned  with the available range of measuring. It includes an encoder  (4)  for generating  4  bit  encoded  data,  a  communicating  section  (5) composed  of  photo  couplers  (PC1,PC2)  for  communicating  data to/from a computer, and a CPU (1) for  applying  data  to  an  LCD section (2) and performing bar-flashing function  in  overflow  or overload condition.
Patent KR-920005779-B1 (KR)
Title: Photosensitive resin composition
Inventor: KIM KWANG-TAE
IPC: G03F7/039
Filed: 1990-06-16
Granted: 1992-07-18
Abstract: The photosensitive resin  compsn.  comprises  novolak  resin, photoactivation  agent  and  solvent.   M-cresol,   p-cresol   and formaldehyde novolak resin, of which molecular weight (12,500) and dispersity (915) is rearranged, is used 50-90 wt.% and diazo based photoactivation agent is used 10-50 wt.%. Novolak resin is  solved in 150 wt.% aceton and precipitated in  toluene  or  benzene.  The precipitate is filtered, dried and rearranged. Rearranged M.W.  of novolak  in   toluene   is   23,500   and   dispersity   is   420. Photoactivation agent is diazo prepared by polyhydroxy benzophenon and 1,2-naphto quinonazido-5-sulphonyl chloride. The  compsn.  can be used in the manufacture of a semiconductive device.
Patent KR-920005552-B1 (KR)
Title: Mould
Inventor: HAN YONG-SU
IPC: B29C45/26
Filed: 1990-08-18
Granted: 1992-07-06
Abstract: The   apparatus   assembles   mould   modules   standardized corresponding to the product size, and  reduces  preparation  time for the  plastic  injection  moulding.  The  assembling  apparatus comprises a fixed core (3) forming a half cavity  (2a),  an  inlet passageway (7), and a plurality of inlet  holes  (7a);  a  driving core (4) having a cavity (26) correspondent to the cavity (2a),  a core pin (10), and a  plurality  of  recovery  pin  holes  (9);  a support block (15), threaded with the driving core (4),  having  a plurality of holes (9',12') for loading recovery pins and ejection pines; an upper ejection block (16) supported  by  a  coil  spring (17) and having a plurality of holes (9",12");  a  lower  ejection block (20) threaded with the upper ejection block (16).
Patent KR-920009792-B1 (KR)
Inventor: AKIEDA HIDEYUKI
IPC: C07C41/26
Filed: 1990-09-29
Granted: 1992-10-22
Abstract: 내용 없음.
Patent KR-930007670-B1 (KR)
Title: Memory module
Inventor: KIM HWA-JUNG
IPC: G06F12/02
Filed: 1991-01-19
Granted: 1993-08-18
Abstract: The memory module accesses every bit by common control signal for one cycle. In the case of accessing specific  bits,  all  bits are accessed. Thus this problem causes the power  consumption  and the limitation of application range at input-output extension.  In order to extent memory area, memory module  has  the  function  of write per bit (WPB) and lessens the mounting space of PCB (printed circuit board). In general, memory ICS  include  the  unused  pins such as NC (no connection) pins. Such unused pins  accomplish  the act of WPB signal terminals. Memory  modules  consist  of  decoder circuits, transfer transistors (MOS IC), write-enable (WE)  signal control parts and CAS signal control parts.
Patent KR-930010944-B1 (KR)
Title: Multi-input nand circuit of bicmos logic
Inventor: HAM YUN-SOK
IPC: H03K19/20
Filed: 1991-03-15
Granted: 1993-11-17
Abstract: The multi-input NAND  circuit  for  Bi-CMOS  logic  uses  the schottky transistors for fast passing the current and reduces  the chip-space for applying the NAND gate  with  multi-input  signals. This circuit includes a noise reduction unit  (10)  which  rejects the noise of input signal, a switching  unit  (20)  which  outputs logical product input signals, and an  inverter  unit  (30)  which inverts  the  output  of  the  switching  unit  (20).  The  diodes (SD1-SDN-1, SDa, SDb) of the switching and inverter  unit  improve the action speed-up suchas  the  schottky  devices.  The  bi-polar transistors exactly regulate the High or Low state of  pulse,  and increase the output driving capacity.
Patent KR-100192102-B1 (KR)
Inventor: NAKAKAITO TOORU
IPC: F23D3/10
Filed: 1991-03-30
Granted: 1999-06-15
Abstract: 연소량에 상관없이 완전연소를 확보하면서 이중연소통의 적열부가 균일하게 적열되도록함으로써, 만족스러운 미관적 및 조작특성들을 나타낼 수 있는 오일버너용 다통연소구조. 
     이 구조는 복수의 원주방향으로 뻗은 줄-같은 천공부들과 복수의 원주방향으로 뻗은 줄-같은 비-천공부들이 수직방향으로 교호로 되는 식으로 설치된 중심통을 구비한다. 그러므로, 연소불꽃의 상단이 이중연소통의 간극속에 위치하도록 하기에 충분할 정도로 연소량을 감소시키기 위하여 십지가 낮추어진 때일지라도, 이중연소통의 적열부의 상부는 균일하게 어둡게 만들어지고 그 하부는 균일하게 적열되도록 만들어지는 한편, 양부분들사이의 경계는 원주방향으로 균일하게 형성되는 것이 확보된다.
Patent KR-940004908-B1 (KR)
Title: Parking apparatus
Inventor: LEE MYONG-KYU
IPC: E04H6/06
Filed: 1991-05-15
Granted: 1994-06-04
Abstract: The rack for performing double-stage parking with reduced weight and energy-consumption, comprises left/right vertical beams (3)(3') and horizontal beams (4)(5) connected on the front/rear/left/right support columns (1)(1')(2)(2'); circular moving bars (6)(6')(7)(7') connected with upper horizontal bars (8)(9) and hanging on four corners of stationary gantry (10); a grooved roller (18) of an upper radial shaft (17) engaged with a round track (15) fixed to the gantry (10); a pallet (14) connected with circular moving gantry (24) and connecting bars (25)(25')(26)(26'); a reduction pinion gear (22) driven by a motor (21) and engaged with an internal gear (23) on the gantry (10); left/right trolleys (31)(31') mounted on rails (28)(28') connected with a movable horizontal shaft (32).
Patent KR-930007654-B1 (KR)
Title: Fertilizer applicator
Inventor: YON KYU-HYOK
IPC: A01C15/00
Filed: 1991-05-28
Granted: 1993-08-18
Abstract: A container box having an open  top  and  narrowing  down  in tapering to an open bottom is mounted on a mount frame having side frames to be mounted on respective  wheels.  The  open  bottom  is plugged by a cylinder provided with a number of holes and having a square section bar through the cylinder to be rotatably mounted on the side frames by bearings.  The  outer  ends  of  the  bar  have respective wheels to frictionally engage with the  support  wheels on the ground. The box also has a fertilizer guide plate shaped to fit with the  bottom  cylinder.  As  the  box  on  the  wheels  is detachably attached to a  tractor with connecting rods and advance following the tractor, fertilizer in the  box  drops  through  the holes in the cylinder to be guided out on the guide plate  to  the ground.
Patent KR-940004994-B1 (KR)
Title: Manufacturing method for semiconductor device with multi-layer connection structure
Inventor: IM JANG-BIN
IPC: H01L21/70
Filed: 1991-05-28
Granted: 1994-06-09
Abstract: forming a first and second conductive layer on a contact hole, to fill the contact hole; carrying out a first etch back process until a native oxide formed at the interface between the first and second conductive layer is exposed; carrying out a second etch back process under the condition that first conductive layer and the native oxide have the same etch rate, to leave first and second conductive layer only in the contact hole; forming a third conductive layer on the substrate or conductive layer, thereby reducing the contact resistance and improving the step coverage of the metal layer.
Patent KR-930011941-B1 (KR)
Title: Manufacturing method sliver for several fancy yarn
Inventor: YANG CHANG-UK
IPC: D02G3/34
Filed: 1991-08-05
Granted: 1993-12-22
Abstract: feed  rollers  (1)(1')(2)(2')  for feeding more than one  strand,  of  base  sliver,  placed  at  the upper- right  side  of  a  base  frame  (a);  transferring  rollers (3)(4) (5)(6)(7) for transferring  multiple  strands  of  the  base sliver, placed along the feeding direction of the base  sliver;  a combing roller (9) installed between the first transferring roller (3)  and the  second  transferring  roller  (4);  guide   rollers (10)(11)(12) (13)  of  the  effect   sliver,   installed   at   the upper-right side of the  transferring  rollers  (4)(5)(6)(7);  and controlling plate, placed at the left side of the base frame  (a), and having the function of directing stoppage or  starting  motion of the guide rollers (10(11)(12)(13).
Patent KR-920000693-B1 (KR)
Inventor: DANIELS WILLIAM A
IPC: C25B3/23
Filed: 1991-10-11
Granted: 1992-01-20
Abstract: 내용 없음.
Patent KR-950000671-B1 (KR)
Title: Cell multiplexing device in asynchronous transfer mode
Inventor: RYU KANG-SU
IPC: H04L12/28
Filed: 1991-11-01
Granted: 1995-01-27
Abstract: The multiplexer comprises a cell buffer (10) for storing cell by kinds of cell, a circuit (13) for receiving transfer request signal from the cell buffer (10) to determine priority of cell transfer by sending transfer allowance signal by set priority, idle buffers (11) and a idle cell controller (12) for transferring idle cells if transfer data do not exist in cell buffers (10).
Patent KR-930011338-B1 (KR)
Title: Polyester fiber of high strength and high shrinkage
Inventor: KIM HONG-JO
IPC: D01F6/78
Filed: 1991-11-05
Granted: 1993-11-30
Abstract: The copolymerized  polyester  drawn  yarn  having  above  0.7 intrinsic viscosity, above 5.0 g/d strength, above 35  %  dry-heat shrinkage rate, above 10 % residual shrinkage rate and  above  1.0 g/ d heat-shrinkage stress is made by: adding  copolymers  of  0-10 mol% of isophthalic acid or dimethylisophthalate (B) against whole acid compn. and 5-15  mol%  of  2,2-bis(4(2-hydroxyethyoxy)phenol) propane (A) against whole  diol  compn.  to  the  main  compn.  of terephthalic acid, while satisfying the eq. 5 mol% <= (A) + (B) <= 20 mol%, 0.5 <= (A)/(A)+(B) <= 1; melt-spinning and  drawing.  The dry- heat shrinkage rate at is that at dry-heat of 170 deg.C for  2 min. after dry-heat treating at 120 deg.C under tension for 2 min.
Patent KR-940007457-B1 (KR)
Title: Thin film transistor and manufacturing method thereof
Inventor: BAE BYONG-SONG
IPC: H01L21/335
Filed: 1991-11-16
Granted: 1994-08-18
Abstract: The transistor consists of a gate electrode (1) which is shaped on the glass plate, an isolating film (2) which is shaped on the gate electrode, a semiconductor layer (3) which is shaped on the isolating film (2), a contact layer (5) which is shaped on the semiconductor layer (3), a protecting film (4) for protecting edge parts of the gate electrode, and source/drain electrodes which are shaped by using the second mask pattern minimizing the part overlapped with the first mask pattern.
Patent KR-100190776-B1 (KR)
Title: 2 beta, 19-ethylene bridged steroids as aromatase inhibitors, process thereof and pharmaceutical composition containing them
Inventor: JOHN O'NEAL JONSTONE
IPC: A61P15/16
Filed: 1991-11-30
Granted: 1999-06-01
Abstract: The present invention is directed to a group of androstane compounds which contain an ethylene radical bridging the 2- and 19-positions. These compounds are useful as aromatase inhibitors and they are prepared by the cyclization of a 19-[2-(4-toluenesulfonyloxy)ethyl]androst-4-ene-3,17-dione using a strong base.