baber/WOPTO huggingface dataset:
Patent KR-840002341-B1 (KR)
Title: Liner sticking of cap
Inventor: MORI FUMI
IPC: B65D53/06
Filed: 1979-09-12
Granted: 1984-12-20
Abstract: A cap, which has a liner, is composed of a cap shell (1) and the liner (5) is prepd. from pressed thermoplastics. The liner has a thin central part (6), a ring-shaped thick rising (7), and a ring-shaped hollow (8). In the liner of the cap, the orientation index I. is defined as I. = 1 + m (1 is the orientation coeff. at the direction of the diam. of the liner, and m is that at the direction of circumference). In the liner, the difference of the orientation index between the circumference and central part is less than 0.37.
Patent KR-810001647-B1 (KR)
Title: Silkworms sericulture house
Inventor: SHIM KYU SANG
IPC: A01K67/04
Filed: 1979-10-08
Granted: 1981-10-27
Abstract: Silkworm rearing house enable to cut the labor cost to remove the silkworm's excrements was manfd.  Thus, vertical roller(7) and circling roller(7') were fixed to the pillar under the plates laid by layer upon layer.  Belt conveyor(9) connected to two rollers and scraper(14) was attached beneath the circling roller.  This conveyor removes the excrements out and scraper cleans the residues upon the conveyor.
Patent KR-810000905-B1 (KR)
Title: Method of producing sodium percarbonate
Inventor: PARK RO HAK
IPC: C01B15/10
Filed: 1980-02-05
Granted: 1981-08-19
Abstract: Sodium percarbonate was prepd. for use as a bleaching agent or an oxiding agent by adding phenol after the reaction of sodium carbonate with hydrogen peroxide.  Characteristics of this method are termed to be a stable one to produce sodium percarbonate with adding phenol as a stabilizer.
Patent KR-840000364-B1 (KR)
Title: Cap
Inventor: GAMM ROBERT J
IPC: A42B1/24
Filed: 1981-01-24
Granted: 1984-03-27
Abstract: The pocket is included in a cap and designed to hold smaller sized personal items.  The cap is formed with a head covering portion and a bill arranged pointing forward.  The pocket is formed of a pair of liners, the inner liner comprising a segment of the head covering portion of the cap, while the outer liner is stitched near its edges with the underlying cap segment.  A course member connects with the upper edge of the outer liner.  The closure member has Velcro(RTM) disposed along its edges for securing it with the cap, and further includes a snap clasp as its upper apex for firm securement of the closure member to the cap.
Patent KR-850000686-B1 (KR)
Title: A burner for burning pulverized fuel
Inventor: BARKER ALBERTI
IPC: F23K3/02
Filed: 1981-03-17
Granted: 1985-05-14
Abstract: A burner to burn pulverized fuel comprises a combustion chamber, an ignition chamber connected to the combustion chamber and equipped with a lighting apparatus like a distribution tube, and an apparatus to supply a mixture of fuel and compressed air, which is connected to the inside of the combustion chamber and is located between the combustion chamber and the ignition chamber.
Patent KR-890000217-B1 (KR)
Title: Stabilized titanium dioxide-pigmented polyolefin compositions
Inventor: STRETANSKY JOSEPH A
IPC: C08K3/22
Filed: 1981-09-17
Granted: 1989-03-10
Abstract: A composition stable toward a degradation caused by an actinic radiation comprises polyolefin selected from polypropylene, ethylene- propylene copolymers and high-density polyethylene, at least 2 wt.% of titanium dioxide, and 0.1-2 wt.% of C12-20 alkylester of 3,5-di- tertbutyl-4-hydroxybenzoic acid.
Patent KR-860000584-B1 (KR)
Title: Process for preparation of 2,3-dichloro-5-trichloromethyl pyridine
Inventor: WERNER JOHN A
IPC: C07B61/00
Filed: 1982-03-11
Granted: 1986-05-17
Abstract: Process for the preparation of 2,3-dichloro-5-trichloromethyl pyridine was described. Thus, 2-chloro-5-trichloromethyl pyridine was chlorinated with Cl2 at 70-250 ≰C in the presence of W(CO)6 or Mo(CO)6  to give 2,3-dichloro-5-trichloromethyl pyridine. The title compd. is used as a herbicide for crop protection.
Patent KR-840000217-B1 (KR)
Title: Method of producing asphalt expansion joint filler
Inventor: CHANG YUN-HWAN
IPC: C08L95/00
Filed: 1982-05-04
Granted: 1984-02-29
Abstract: Asphalt expansion joint filler for architectural atructure is prepared from cork powder, lauan saw-dust, and the asphalt mixture(I).  Mixing ration of cork to saw-dust, is 2, and the mixture is dried for 5 minutes through heating under 30-50≰C.  I is obtained in a rotary mixer at 150-200≰C, of which the components and compositions are 60% of brown asphalt, 15% of straight asphalt, 8% of cut back asphalt (RC-3), 7% of cut-back asphalt (MC-3), 5% of asbestos, and 5% of natural rubber. Final product is obtained by means of hydraulic press (300 kg/cm2) from the mixture of 40% cork-saw dust and 60% of I.
Patent KR-870000868-B1 (KR)
Title: Process for preparing bicyclic pyrimidine-5-one derivatives
Inventor: KENNIS LUDO E J
IPC: C07D211/32
Filed: 1982-06-25
Granted: 1987-04-30
Abstract: The title compds. I [R1=H, lower alkyl, Ar; R2=H, lower alkyl, Ar; R3=H, lower alkyl; A=-(CH2)2-, -(CH2)3-, etc.; Q=-X-Ar; X=-CO-, - CHOH, -CN-NH2, etc. , useful as a psychosis curing agent, are prepd. Thus, a mixt. contg. 36 parts 5-(2-hydroxyethyl)-6methyl-2-[(1)-methyl-2-oxopropyl)thio -4-(3H)-pyrimidione and 240 parts 60%- HBr.acetate is stirred and heated at 90≰C for 4h. The resulting ext. is dissolved in 400 parts 2-propanone, washed, and dried to give 44 parts 6-(2-bromoethyl)-2,3,7-trimethyl-5Hthiazole[3,2-alpha -pyrimidin-5-one monoHBr.
Patent KR-870000572-B1 (KR)
Title: Cooler for rotary electric machine
Inventor: USSUNOMIYA YUMITERU
IPC: H02K9/06
Filed: 1982-08-21
Granted: 1987-03-19
Abstract: The device has a ventilation guide which is disposed at the coil end portion of the stator of the rotary electric machine. The guide divides the stator coil end portion in an axial direction of the rotor of the rotary eletcric machine into a first ventilating section for advancing cooling air onto an inner peripheral side of the coil end portion. Also formed is a second ventilating section for advancing the cooling air, having passed through the first ventilating section onto an outer peripheral side of the coil end portion.
Patent KR-870002098-B1 (KR)
Title: Forming apparatus of a steel pipe
Inventor: YOCHIDA GEIITSIRO
IPC: B21D15/00
Filed: 1984-01-26
Granted: 1987-12-08
Abstract: The device includes a cylinder frame 2 consisting of two half sections 2a, 2b and being uprightly fixed on a base 1.  The frame is provided with press forming rollers 3, 3a, 3b arranged radially with an equal spacing, and the shafts 4s of the rollers are clamped between the sections 2a and 2b, which are joined by bolting.  The rollers are connected to respective drive units 21. The device can process a pipe positioned in the center of the rollers to form recesses on the surface of the pipe while axially moving with rotation.
Patent KR-910001438-B1 (KR)
Inventor: GEIGER ROLF
IPC: C07D209/52
Filed: 1984-01-28
Granted: 1991-03-07
Abstract: 내용 없음.
Patent KR-860000573-B1 (KR)
Title: Method for manufacturing -l-aspartyl-l-phenylalanine ester
Inventor: CHOE YONG-HWAN
IPC: A23L27/00
Filed: 1984-05-18
Granted: 1986-05-17
Abstract: α-L-aspartyl-L-phenyl alanine ester I ≮R1 = alkyl ≉ is prepd. for use as a sweetening agent. N-fluorenylmethylformyl aspartic acid is reacted with phenylalanine ester in organic solvent such as dioxane, acetic anhydride, toluene, acetic acid. This reaction is catalized by triphenyl phosphine and hydrobromic acid. This protein sweetening agent is 200 times sweeter than sugar.
Patent KR-920003584-B1 (KR)
Inventor: TAKAMIYA YOSIO
IPC: B21F31/00
Filed: 1984-10-17
Granted: 1992-05-04
Abstract: 내용 없음.
Patent KR-890004788-B1 (KR)
Title: Process of forming a film of fluorine containing resin on a metallic substrate
Inventor: SUNADA KOKI
IPC: C23C18/20
Filed: 1985-02-15
Granted: 1989-11-27
Abstract: The fluoro resin film having high mechanical properties is coated in 6 steps: (a) coating fluoro resin on metal substrate, (b) putting the fluoro resin coated metal substrate into a vacuum chamber, (c) lowering the pressure of the vacuum chamber to 10-3 Toss, (d) heating the chamber at 330≰C-420≰C for predeterminded time, (e) cooling slowly the chamber, in nature state, to prequenching state lower than heating temp, (f) introducing inert gas to chamber for fast-cooling of the coated fluoro resin film on the metal substrate.
Patent KR-870000827-B1 (KR)
Title: Process for preparing cephalosphorin derivatives
Inventor: MUTO SHIGEAKI
IPC: A61K31/545
Filed: 1985-02-22
Granted: 1987-04-23
Abstract: Title compds. I[R1=C1-4 halogeno alkyl  are prepd. Thus, 2.6g 7beta- [2-(2-amino-4-thiazolyl)-(Z)-2-methoxyimino acetamido -3[(2-methyl- 1,3,4-thiadiazol-5-yl)thiomethyl -3-cephem-4-carboxylic acid and 1 ml dicyclohexyl amine in 100 ml anhyd. acetone is treated with 0.82 g dichloroacetyl chloride in 10 ml acetone at -10≰C for 1h. The resulting ppt. is dissolved in a mixt. contg. 50ml ethyl acetate and 25ml H2O, washed with HCl and satd. NaCl, dried, and chromatog. to give I (R1=CHCl2) (yield=75%).
Patent KR-880001075-B1 (KR)
Title: Method of encaosulated articles
Inventor: OLDHAM SUSAN L
IPC: B29C70/66
Filed: 1985-05-08
Granted: 1988-06-22
Abstract: The method for encapsulating and impregnating an article comprises (a) placing the article in the cavity of a rigid mould; (b) loading the mould into a chamber heated to a certain temp.; (c) filling the mould cavity with a low viscosity thermosetting resin; (d) evacuating the cavity to impregnate the article with the resin and to degas the mould contents; (e) releasing the vacuum to atmospheric pressure to burst remaining gas bubbles; (f) applying pressure to the mould to encapsulate the article in the resin; (g) ejecting the article from the mould; and (h) heating the article to cure the resin.  The composite articles are useful for aerospace applications.
Patent KR-920010841-B1 (KR)
Inventor: NAUMAN ROLF
IPC: G11B5/706
Filed: 1985-06-18
Granted: 1992-12-19
Abstract: 내용 없음.
Patent KR-900008113-B1 (KR)
Title: Fluoroallyl-amine derivatives
Inventor: MCDONALD LAN A
IPC: C07C67/00
Filed: 1985-07-12
Granted: 1990-10-31
Abstract: Fluoroallylamine derivs. of formula (I) and their pharmacologically acceptable acid addn. salts are prepared. In (I), R1 and R2 each= H, Cl or F; R3= H or C1-4 alkyl; and X= O or S (I) are monoamine oxidase (MAO) inhibitors capable of preferentially inhibiting MAO-B. At suitable low doses MAO-A is not inhibited, avoiding the cheese effect. (I) are thus useful for treating depression or for potentiating l-dopa in treatment of parkinsonism.
Patent KR-920009245-B1 (KR)
Inventor: GANDA HISASHI
IPC: D02H13/26
Filed: 1985-09-09
Granted: 1992-10-15
Abstract: 내용 없음.
Patent KR-890003918-B1 (KR)
Title: Dot pattern generating system
Inventor: SIKANAI NAOKI
IPC: G06F3/12
Filed: 1985-09-27
Granted: 1989-10-12
Abstract: The system is for printing out a dot pattern continuously and efficiently on a printing device by displaying and printing out dot pattern information which has continuous dots thinned out as condensed characters with optional dot pitch.  Two knids of timers are provided to a PMCLK (18) for the timing of the determination of the carrying speed of a printing head and FiRETiM (19) for the timing of the determination of the driving frequency of each element of the printing head per unit time.
Patent KR-900002100-B1 (KR)
Title: Method and apparatus for controlling operation of disc refiner
Inventor: ELLERY JOHN M SR
IPC: D21D1/30
Filed: 1985-10-10
Granted: 1990-04-02
Abstract: A method of operating a disc refiner which is driven by a main drive motor and which has disc whose separation is controlled by an auxiliary motor.  The method comprises continously carrying out the following steps; generating a first signal representing the actual power used by the main drive motor; generating a second signal representing the available power for the main motor generating a third signal representing the maximum auxiliary motor speed; dividing the second signal by the third signal to obtain a first quotient signal; dividing the first signal by the first quotient signal to obtain a second quotient signal.
Patent KR-900005876-B1 (KR)
Title: Solid state image sensor
Inventor: KIMATA MASHAHUMI
IPC: H04N5/374
Filed: 1986-01-23
Granted: 1990-08-13
Abstract: The solid-state image sensor includes pixels including photodetectors (111-148) for detecting light signal and vertical charge transfer (210-240) for transferring signal charges. The pixels are arranged in two directions orthogonal to each other. A transfer gate scanning circuit (600) sequentially selects as pixels row from several pixel rows arranged in a second direction. A charge sweep device scanning circuit (700) supplies readout signals to the selected pixel rows so that signal charges may be read out several times within a horizontal scanning interval from the photodetectors (111-148).
Patent KR-870001643-B1 (KR)
Title: Method and apparatus for forming a row of zigzag coupling elements for slide fasteners
Inventor: MACHEUDA YASEUHIKO
IPC: A44B19/42
Filed: 1986-03-29
Granted: 1987-09-18
Abstract: Method and appts. for forming a row of continuous zigzag coupling elements for slide fasteners on a rotating die wheel raving an annular groove in its peripheral surface and pair of rows of cirmunferentially staggered pins, one row on each side of the groove.  The method comprising (A) winding the monofilament alternately around the pins in a zigzag form; (B) forcing the zigzag monofilament in the annular groove so as to shape it into a row of folded u-shaped zigzag coupling element blanks having parallel legs; and (C) compressing the lower fortions of the ushaped coupling element blanks into the pinal form of the coupling elements.
Patent KR-890002730-B1 (KR)
Title: Circuit arrangements for discharge lamps
Inventor: YUN SE-YANG
IPC: H05B41/14
Filed: 1986-08-13
Granted: 1989-07-25
Abstract: The circuit for removing the mis-operation after starting the lamp includes a bifilar wound transformer (T) which count electromotive force biases reversely the cut-off side main transistor in an instant not to be turned on, and a charging condenser (C4) for trigger pulse generation of which both taps are disconnected automatically not to generate the move pulses after starting the lamp.
Patent KR-900001153-B1 (KR)
Title: Actuating relay for vehicle seat belt tensioning device
Inventor: REGERE ARNO
IPC: H01H36/00
Filed: 1986-12-09
Granted: 1990-02-27
Abstract: The operating switch for a vehicle seat belt restraint device has a reed contact device (1) contained within the switch housing (2) with its longitudinal axis perpendicular to the travel direction and vertical to the vehicle horizntal plane.  The contact device is enclosed by annular magnet (4) perpendicular to its longitudinal axis held equidistant from the contact device via a spring system (5) in the rest position and displaced horizontally upon impact to operate the contacts.  Pref. the switch housing has a circular chamber (6) containing the annular magnet which is supported from the chamber walls via equiangularly spaced compression springs (5).
Patent KR-910005532-B1 (KR)
Title: Composition and process for consitioning the surface of plastic substrates prior to metal plating
Inventor: DEL GOBBO ANTHONY R
IPC: H05K3/42
Filed: 1985-05-08
Granted: 1991-07-31
Abstract: An alkaline composition for enhancing the adhesiveness of metal plating to a plastic substrate comprising: (a) a compound represented by general formula (I), and (b) a compound represented by general formula (II), wherein R1, R2, R3, and R4 are independently selected from the group consisting of hydrogen atoms, aryl groups and alkyl groups of 1-4 carbon atoms, m is 0 to 2 and n is 2 to 5; the compositions comprising, by weight, about 10 gram/liter (g/l) to saturation compound (a) and about 10g/l to saturation compound (b). The composition is preferably employed before alkaline permanganete etching of the plastic, followed by electroless metal plating using conventional techniques.
Patent KR-930003244-B1 (KR)
Inventor: LACROIX ALAIN
IPC: C11D3/395
Filed: 1985-09-20
Granted: 1993-04-24
Abstract: 내용 없음.
Patent KR-950002356-B1 (KR)
Inventor: KARLEN JAMES P
IPC: B25J9/10
Filed: 1987-02-17
Granted: 1995-03-17
Abstract: 내용 없음.
Patent KR-890002037-B1 (KR)
Title: Small denier torque yarn and it's making method
Inventor: KIM DAL-GYU
IPC: D02G3/24
Filed: 1987-09-23
Granted: 1989-06-08
Abstract: The invention relates to a fine torque yarn having low uniformed torque for thin stocking knitting.  The undrawn yarn from a creel is passed through rollers 2 and 3 to be heated at 130-180 deg.C by a heater 4 and is given not more than 200 torque level to be stretched at 25-40% stretchability.   Twisting is given in variations by adjusting the contact distance on a twist cylinder 5 with positions of guide rollers g1 and g2.  The produced yarn improves the quality of stockings with the uniformed torque.
Patent KR-900002343-B1 (KR)
Title: Process of 2-(1-pentyl-3-quanidino-4-(2-methyl-4-inidazolyl)thiazole and their crystaline dihydrochloride trihydrate
Inventor: ALLEN DOUGLAS J M
IPC: C07D417/04
Filed: 1987-10-28
Granted: 1990-04-12
Abstract: The title cpds. of formula (I) and their pharmaceutically acceptable acid addn. salts are prepd. by reacting 2-guanidino-4(2-alkyl-4- imidazolyl)-thiazole with amine of formula RNH2 in the presence (or absence) of inert solvent at 50-150 deg. C.  In the formulas, R= benzyl or C1-5 alkyl; R1= C1-5 alkyl.  (I) have a good antiulcer activity.
Patent KR-910002603-B1 (KR)
Inventor: OHTA HARUO
IPC: H04N5/92
Filed: 1987-11-13
Granted: 1991-04-27
Abstract: 내용 없음.
Patent KR-900002552-B1 (KR)
Title: Glass cutting method and apparatus
Inventor: MOULY RAYMOND J
IPC: C03B21/04
Filed: 1987-12-09
Granted: 1990-04-20
Abstract: Glass sheet to be cut is maintained at a temp. at which it is sufficiently rigid to be handled without marking or impairment of optical properties, and the cut line is selectively heated to at least the softening temp. before the cut is made.  Pref. the glass in the vicinity of the cut line is maintained at least at the strain point temp, while the body of the sheet may be maintained at least at the annealing temp.  Selective heating may be effected by directing flames from a line heater against one or both major surfaces.  The sheet may be a continuously advancing ribbon of float glass and the heaters and the cutting blade may be mounted to temporarily advance with it.
Patent KR-960004325-B1 (KR)
Inventor: WILLIS DONALD HENRY
IPC: G11C8/16
Filed: 1988-01-29
Granted: 1996-03-30
Abstract: 내용 없음.
Patent KR-900006802-B1 (KR)
Title: Arrangements for discharge lamps
Inventor: CHANG SOK-SEUNG
IPC: H05B41/16
Filed: 1988-02-15
Granted: 1990-09-21
Abstract: The electronic ballast providing constant voltage regardless input voltage to the fluorescent lamp comprises a noise filter (1) of filtering the noise from the input voltage, a full-wave rectifier (2) rectifying the filtened input voltage, a controller (3) providing proportional output voltage but inverse proportional one from the preset critical voltage, to the rectified input voltage a constant voltage circuit (4) providing constant voltage, a trigger pulse generator (5) providing the programmable phase control pulse, a rectifier (6) providing DC constant voltage rectified by the trigger pulse signal.
Patent KR-910007781-B1 (KR)
Title: Method of fabricating semiconductor memory
Inventor: CHOI DO-CHAN
IPC: H01L27/108
Filed: 1988-03-12
Granted: 1991-10-02
Abstract: The semiconductor memory device for improving reliability  by minimizing the interaction of cells is  manufactured  by:  forming a trench  (1)  on  silicon substrate (16), followed by forming an oxide layer (2)  and  etching  the  oxide layer to open the bottom of trench; depositing an  polysilicon  (3)  on  oxide  layer  (2), followed by ion doping at  the  polysilicon  by  focul  processing or  ion implantation;  forming  a  thin  oxide   layer   (4)   for storage  oxide   on   the  polysilicon  (3)  and  depositing   the polysilicon (5) on the oxide  layer   (4);   The  apposition  type impurity to the substrate is implanted into the polysilicon (5).
Patent KR-960007291-B1 (KR)
Inventor: DAUBENBUCHEL WERNER
IPC: B29C49/22
Filed: 1988-03-12
Granted: 1996-05-30
Abstract: 내용 없음.
Patent KR-970007091-B1 (KR)
Inventor: DATTA PAUL J
IPC: A61L15/00
Filed: 1988-04-09
Granted: 1997-05-02
Abstract: 내용없음
Patent KR-910008101-B1 (KR)
Title: Feedback type data output circuit of semiconductor memory device
Inventor: CHOI YUN-HO
IPC: G11C11/407
Filed: 1988-12-30
Granted: 1991-10-07
Abstract: The circuit latches the output of the unit function block  of semiconductor memory device to break the data flow and disables  a sense amplifier to transmit  the  don't  care  signal  to  a  data transmitting circuit. The  circuit  comprises  a  sense  amplifier (SA') for amplifying and transmitting the faint  signal  from  the unit cell to an I/O line, a read  driver  (RD')  for  reading  the output signal of the I/O line sense  amplifier  (SA'),  an  output latch block (OLB) for latching  the  output  signal  of  the  read driver (RD'), an output buffer  (DOB)  for  buffering  the  output signal of the  output  latch  block  to  transmit  to  the  output terminal (Do), a precharge block (PRB) for synchronizing an  input terminal (Nd) of the output buffer to the precharge clock (Cp)  to precharge, and a state transition detection block (STD)  detecting the state transition of data inputing to the input terminal of the output buffer to generate the feedback control clock.
Patent KR-960014553-B1 (KR)
Title: Modifiers for aqueous basic solutions of phenolic resole resins
Inventor: DUNNAVANT WILLIAM R
IPC: C08K5/05
Filed: 1988-04-25
Granted: 1996-10-16
Abstract: The subject invention relates to modifiers for aqueous basic solutions of phenolic resins. The modifiers are open-chain ether alcohols or ketone alcohols. They assist in stabilizing the aqueous basic solutions of phenolic resole resins and improve the tensile strength of foundry shapes prepared from foundry mixes made with the aqueous basic solutions.
Patent KR-920011023-B1 (KR)
Title: Wholly aromatic polyester
Inventor: AN TAE-WAN
IPC: C08G63/60
Filed: 1989-02-24
Granted: 1992-12-26
Abstract: The method for producing  an  aromatic  polyester  having  at least 0.3  intrinsic  viscosity  and  an  optical  anisotropy  is characterized  by  polymerizing  components  (I)(II)(III)  with  a component (IV) of 5-35 mol % in the presence of an  ester-internal conversion catalyst at 150-400 deg.C. The catalyst is dialkyl  tin oxide,  diaryl  tin  oxide,  titanium  alkoxide,  alkoxy  titanium silicate, BF3 or hydrogen  chloride.  The  polyester  has  a  melt workability at 350 deg.C or less.
Patent KR-920005325-B1 (KR)
Inventor: YAMADA TETSUO
IPC: H04N5/341
Filed: 1989-03-07
Granted: 1992-07-02
Abstract: 내용 없음.
Patent KR-920004194-B1 (KR)
Inventor: YAMAYA NORIMASA
IPC: C08K5/41
Filed: 1989-05-17
Granted: 1992-05-30
Abstract: 내용 없음.
Patent KR-920003553-B1 (KR)
Title: Cover for a closet seat
Inventor: KIM DOO-JIN
IPC: A47K13/16
Filed: 1989-05-19
Granted: 1992-05-04
Abstract: The paper cover sheet  (1)  having  generally  unidirectional texture  is  provided  with  a  perforated  tear-off  line  of  an ellipticall shape in the center to correspond to the  toilet  bowl mouth. The tear-off line is perforated in such a manner  that  the bridge between the adjacent perforations remains in the  direction of the paper  texture  to  facilitate  tear-off  by  pulling.  The perforated line prevents tear-off at wrong places other  than  the line.