baber/WOPTO huggingface dataset:
Patent KR-900005895-B1 (KR)
Title: Manufacture of ceramic circuit substrate
Inventor: SUZUKI HIDOSHI
IPC: H05K1/09
Filed: 1987-12-17
Granted: 1990-08-13
Abstract: The ceramic circuit board is prepared by the stages of forming a conductor portion of the ceramic circuit board by printing a conductive paste compsn. on a ceramic base plate (pref. a ceramic green sheet) and then firing the ceramic base plate together with conductive paste compsn., where a copper-base compsn. comprising 100 wt.% copper powder and 0.5-5 wt.% (pref. 0.5-3.5 wt.%) of at least one organometallic cpd. (pref. an organic titanate or aluminate cpd) capable of forming an organic cpd. or cpds. when fired in an inert atmos. is used as the conductive paste compsn.
Patent KR-900003967-B1 (KR)
Title: Cooking method of electronic range
Inventor: HO KI-TAE
IPC: H05B6/68
Filed: 1987-12-22
Granted: 1990-06-05
Abstract: The method for calculating temperature increment exactly by shortening the period of temperature detection and enlarging the period of temperature comparision comprises a first process for detecting and storing temperature of inflowing air on memories (M0, M1,....), a second process for shifting temperature stored in memories, and a third process for calculating temperature increment ( U) and temperature difference between inflowing air and exhausting air when the temperature of inflowing air coincides with the temperature stored in the memory (M0).
Patent KR-910008826-B1 (KR)
Inventor: NAKAMURA LIDAKA
IPC: G01D3/02
Filed: 1988-01-08
Granted: 1991-10-21
Abstract: 내용 없음.
Patent KR-910004961-B1 (KR)
IPC: B21C1/00
Filed: 1988-04-23
Granted: 1991-07-20
Abstract: A wire drawing device for drawing a plurality of strands (a-g) simultaneously in a downstream direction through a plurality of groups of dies (10a-10g), there being one die (10) for each strand. Each group of dies (10a-10g) is held in a retaining means (16) comprising first and second portions (15, 17) adapted for movement toward and away from one another. When the retaining means (16) is in the open position, wherein the portions (15, 17) have been moved away from each other, any one of the plurality of dies (10a-10g) may be removed without removing or displacing other dies in the same group. when the portions (15-17) are moved toward each other, they overlie at least partially the dies (10a-10g) in the group and thereby retain them in position.
Patent KR-950002154-B1 (KR)
Inventor: GANDOLFI CARMELO A
IPC: C07D405/12
Filed: 1987-06-25
Granted: 1995-03-14
Abstract: 내용 없음.
Patent KR-930010831-B1 (KR)
Inventor: MACNAK PHILIP P
IPC: H01Q1/27
Filed: 1987-01-02
Granted: 1993-11-12
Abstract: 내용 없음.
Patent KR-950001002-B1 (KR)
Title: Press punching apparatus of two sided adhesive tape
Inventor: JO KYU-CHOL
IPC: C09J7/00
Filed: 1989-01-19
Granted: 1995-02-06
Abstract: The press punching device is used for both-face adhesive tape to bond specially formed products having the same bonding surfaces and assemble them to a combined body, comprises a pulley support frame (2) having a pair of roll fixing pulleys (4), a support frame (7) having a pair of guide rollers (5) and tape bonding rollers (6)(6-1) on the machine frame, a punching device (11) driven by a pneumatic cylinder (12), a support frame (30) having tape drawing rollers (31)(31-1); projected peripheral portions on both peripheral edges of the guide roller; step motors (8)(32) respectively mounted on the rollers (6)(31), lifting height adjusting screws (10)(34) of operating bars (9)(33) for adjusting the height of the rollers (6-1)(31-1).
Patent KR-0161964-B1 (KR)
Inventor: PHILIPEE BOUSQUET
IPC: G11B15/12
Filed: 1989-04-25
Granted: 1998-12-15
Abstract: 개시된 열-자기 헤드는 주위 온도에서 자성을 가지는 갭을 가진다. 상기 갭은 큐리 온도 이상으로 가열되어 자성을 잃는다. 상기 갭의 양측면의 극편들(pole pieces)은 상기 갭에 가열 전류를 전달하는 전도체를 형성한다.
Patent KR-930003666-B1 (KR)
Title: Blind rivet
Inventor: BRADLEY WILLIAM D
IPC: F16B19/10
Filed: 1989-05-26
Granted: 1993-05-08
Abstract: A blind rivet able to be anchored in material such as softwood, without the need to break through the blind face (36) of the material, comprises a tubular shell (14) and a stem (15) which extends through the shell. The shell (14) has a preformed head (18) at one end of a shank (17). An end portion (19) of the shank remote from the head (18) has a thinner wall (21) than the main, next adjacent, portion of the shank, and is thus weakened and made more easily expandible. The stem (15) has a plugging portion (28) having an expander head (29) adjacent the thin-walled end portion 19) of the shell, a breakneck (27), and a pulling portion (26) which projects from the head end of the shell. The expander head (29) increases in diameter away from the pulling portion (26), and presents a plurality of longitudinal cutting elements (24) generally towards the weakened end portion (19) of the shell. On gripping the pulling portion (26) and pulling the stem (15), the cutting elements split the end portion (19) of the shell into a plurality of legs (37), while the expander head (29) enters into the end portion (19) and forces the legs (37) outwardly. The main part of the shank (17) has a smaller diameter bore (20) than the weakened end portion (19), and resists entry of the expander head (29).
Patent KR-940007323-B1 (KR)
Title: Process for preparation of polyphenylene sulfide
Inventor: LEE WAN-IN
IPC: C08G75/04
Filed: 1989-06-30
Granted: 1994-08-13
Abstract: This relates to manufacturing polyphenylene sulfide with high melting viscosity and little impurity. In the preparing polyphenylene sulfide by reacting polyhalogenated aromatic compd. with alkali metal sulfide in an organoamide or lactam solvent, a 12-24 membered crown ether compd. as a catalyst is used in the mol ratio of 0.001-0.2.
Patent KR-970000066-B1 (KR)
Title: Synchronizing circuit for reducing waiting-time jitter in a demultiplexer
Inventor: RAINER HEISS
IPC: H04J3/06
Filed: 1989-12-16
Granted: 1997-01-04
Abstract: There are time-division multiplex communication systems in which digital signals which are asynchronous with the pulse frame and consist of successive blocks whose beginnings are marked with sync words are inserted into the pulse frame. The resulting jitter of the sync words ("waiting-time jitter") is reduced by a circuit which derives from the clock of the received sync words a sync signal (SY) that exhibits less jitter than the clock of the received sync words. According to the invention, the circuit contains a measuring device which measures the time intervals (N) between the sync words, a filter (F) which takes the average (N') of the time intervals (N), and a signal generator (S) which forms the sync signal (SY) from said average (N') in such a manner that the pulse period of the sync signal (SY) is equal to said average (N').
Patent KR-930000421-B1 (KR)
Inventor: AMANO MASAKI
IPC: B66B1/20
Filed: 1990-03-29
Granted: 1993-01-21
Abstract: 내용 없음.
Patent KR-0155165-B1 (KR)
Inventor: HENNIG BRUNO E
IPC: H04N3/16
Filed: 1990-04-19
Granted: 1998-11-16
Abstract: 내용없음.
Patent KR-100198208-B1 (KR)
Inventor: CHAN C S
IPC: G06T11/60
Filed: 1990-05-16
Granted: 1999-06-15
Abstract: 내용 없음.
Patent KR-960012744-B1 (KR)
Inventor: KOMOTO AKIRA
IPC: G01G7/04
Filed: 1990-07-31
Granted: 1996-09-24
Abstract: 요약없음
Patent KR-0164595-B1 (KR)
Title: 2,3-dihydro-1-(pyridinylamino)-indoles, a process for their preparation and their pharmaceutical compositions containing them
Inventor: EFFLAND RICHARD CHARLES
IPC: A61K31/4433
Filed: 1990-08-01
Granted: 1999-01-15
Abstract: This invention relates to 2,3-dihydro-1-(pyridinylamino)-indoles of the formula <CHEM> wherein R1 is hydrogen, loweralkyl, aryl, arylloweralkyl, alkenyl, alkynyl or heteroarylloweralkyl selected from the group consisting of pyridinylmethyl, pyridinylethyl, thienylmethyl, thienylethyl; R2 and R3 are independently hydrogen, loweralkyl, aryl, arylloweralkyl or heteroarylloweralkyl selected from the group consisting of pyridinylmethyl, pyridinylethyl, thienylmethyl, thienylethyl; or R2 and R3 together form a cycloalkane ring of 4 to 6 carbons or a spiro-fused aryl or heteroaryl cycloalkane; X and Y are independently hydrogen, halogen, hydroxy, loweralkyl, loweralkoxy, nitro, amino or trifluoromethyl; m and n are independently integers of 1 to 3, the pharmaceutically acceptable acid addition salts thereof and where appropriate, the optical, geometrical and stereoisomers and racemic mixtures thereof. The compounds of this invention are useful as analgesics, anticonvulsants, for enhancing memory and for the treatment of Alzheimer's disease.
Patent KR-0180225-B1 (KR)
Title: Use of antiprogestomimetics for stimulating ovulation
Inventor: GRANDADAM JEAN ANDRE
IPC: A61K31/58
Filed: 1990-09-06
Granted: 1999-03-20
Abstract: The invention relates to the use of antiprogestomimetics for the manufacture of pharmaceutical compositions designed to stimulate ovulation.
Patent KR-940004259-B1 (KR)
Title: Manufacturing method of nosfet
Inventor: CHA KON-OP
Filed: 1990-12-13
Granted: 1994-05-19
Abstract: forming a first insulating layer on a first conductive-type semiconductor layer, and removing first insulating layer selectively; forming a trench by etching the substrate using first insulating layer as a mask; forming a gate insulating layer on the surface of the trench, and depositing a polysilicon and low temperature oxide sequentially on the overall surface on the substrate; forming two gate electrodes on the both side walls of the trench by selectively etching the gate insulating layer, polysilicon layer and low temperature oxide; forming a second conductive-type drain region in the exposed bottom of the trench; isolating the sidewall of the gate electrodes, and forming a drain electrode to come into contact with the drain region between two gate electrodes; forming a source region on the both sides of the gate electrodes, thereby reducing the short channel effect.
Patent KR-930009584-B1 (KR)
Title: Method for manufacturing a capacitor
Inventor: JONG JAE-YONG
IPC: H01L27/108
Filed: 1990-12-13
Granted: 1993-10-07
Abstract: For fabricating a capacitor for  increasing  of  capacitance, the method includes the steps of forming a first polysilicon layer on the substrate, patterning a first polysilicon, forming a  first oxide layer on the resultant, forming  a  first  contact  hole  by etching the  first  oxide  layer  selectively,  forming  a  second polysilicon sidewall on the sidewall  of  a  first  contact  hole, removing the first oxide layer, forming a second  oxide  layer  on the resultant, selective etching the second oxide layer to form  a second contact hole having one of second polysilicon sidewalls  in the center, forming a third polysilicon sidewall on the side of  a second contact hole and a second  polysilicon  sidewall  which  is formed in a second contact hole, removing a second oxide,  forming a dielectric layer on the exposed surfaces of a first  polysilicon layer, a second polysilicon layer and a third  polysilicon  layer, forming a plate electrode on the dielectric layer.
Patent KR-930004640-B1 (KR)
Title: Video camera
Inventor: MUN YONG-SUN
IPC: H04N7/18
Filed: 1990-12-22
Granted: 1993-06-02
Abstract: The device providing a system of low cost comprises: a  micom (100) controlling the system operation according to a  program;  a first converting  means  which  converts  the  picture  signal  of visitors inputted from the camera  (10)  into  the  digital  image data; a recording  means  which  stores  the  digital  image  data outputted from the first converting  means;  a  second  converting means for reproducing the analog image signal converted  from  the digital data on monitor (20); a means for generating the  field-in signal after separating the image signal inputted from the  camera into  the horizontal  synchronizing  signal  and   the   vertical synchronizing signal; a means for generating the address signal of image recording means.
Patent KR-930002266-B1 (KR)
Title: Hollow fiber membranes using for evaporation of deodorants
Inventor: KIM JONG-HAK
IPC: A61L9/12
Filed: 1990-12-24
Granted: 1993-03-27
Abstract: The solution discharging apparatus by  using  a  hollow  yarn membrane comprises a hollow yarn membrane (3) the one end of which is closed by binding a number of line of it, and the other end  of which is inserted into a solution container (1). The size of pores (4) provided at the surface of the hollow yarn membrane is between 0.001 and 0.1  m. The pressing means (6) that applies pressure  on the solution is provided on the solution container. A support  (7) that supports the solution container,  when  it  is  reversed,  is provided.
Patent KR-0146369-B1 (KR)
Inventor: GERARD OWEN MCCANN
IPC: B60T8/1761
Filed: 1989-02-09
Granted: 1998-12-01
Abstract: 내용없음.
Patent KR-930004468-B1 (KR)
Title: Tube green for golf training on water surface
Inventor: KIM KYONG-HO
IPC: A63B69/36
Filed: 1991-01-15
Granted: 1993-05-27
Abstract: The green has a looped floating tube (1) being inflated  with air and having on the inner side of the loop a plurality  of  hook eyes (2), a plurality of tension rib members (3)  each  having  on both ends hooks (4) for engaging resp. eyes (2), the  rib  members intercrossing one another in center in  assembling,  rope  strings (6) being tied on an anchor at one end and tied at the  other  end on one of hook eyes (5) provided on the outer  side  of  the  tube loop, and a green cover sheet (7) having a round edge  lacing  (8) covering the tube  loop  (1)  and  having  a  flag  pole  (9)  for targeting. The assembled float green is anchored  on  water  in  a pond, lake or stream, as  suited  taking  advantage  of  the  land circumference, to be targeted at for golf  shots.  The  successful balls stay put on the green for easy counting,  while  the  failed balls float off the green to be collected later.
Patent KR-930003421-B1 (KR)
Title: System self-testing apparatus and method for color video printer
Inventor: HONG SUNG-HO
IPC: A61B17/125
Filed: 1991-01-15
Granted: 1993-04-29
Abstract: The  apparatus  performs  self-diagnosis  of  a  color  video printer by using system-diagnostic  program  and  the  image  data stored in an  image  memory  for  demonstration,  and  controlling luminance and hue of the  printer.  It  includes  a  video  signal processor (30) for processing the output signal of an image memory section (20) to generate digital  signal,  a  thermal  print  head controller (50) for controlling a line memory  (40),  mechanism  a section (60) for printing the data of the line  memory  (40)  onto papers, and a servo section (70) for initializing the position  of the mechanism section (60).
Patent KR-0150798-B1 (KR)
Inventor: MARUYAMA SUSUMU
IPC: C07K5/08
Filed: 1991-02-19
Granted: 1998-08-17
Abstract: 본원 발명은 옥수수단백질유래의 신규올리고펩티드 및 옥수수단밸질유래의 특정 올리고펩티드(oligopeptide)를 유효성분으로서 함유하는 안지오텐신(angiotensin)변환효소저해제에 관한 것이고, 본제는 고혈압증의 치료 또는 예방에 유용하다고 기대되며, 본원 발명은 L-Leu-L-Ser-L-Pro, L-Leu-L-Gln-L-Pro, L-Val-L-Ser-L-Pro, L-Leu-L-Leu-L-Pro, L-Leu-L-Asn-L-Pro, L-Phe-L-Leu-L-Pro, L-Leu-L-Ala-L-Ala, L-Val-L-Ala-L-Ala, L-Leu-L-Gln-L-Gln, L-Val-L-Ala-L-Tyr, L-Leu-L-Ala-L-Tyr, L-Leu-L-Ser-L-His, 및 그 산부가염, L-Ile-L-Arg-L-Ala 및 그 산부가염, L-Leu-L-Arg-L-Pro 및 그 산부가염, 및 L-Ile-L-Arg-L-Ala-L-Gln-L-Gln 및 그 산부가염을 제공하고, 또한 L-Tyr-L-Val, L-Leu-L-Tyr, L-Leu-L-Phe, L-Phe-L-Tyr, L-Tyr-L-Arg 및 그 산부가염, L-Leu-L-Ser-L-Pro, L-Leu-L-Gln-L-Pro, L-Val-L-Ser-L-Pro, L-Leu-L-Leu-L-Pro, L-Leu-L-Asn-L-Pro, L-Phe-L-Leu-L-Pro, L-Leu-L-Ala-L-Ala, L-Leu-L-Gln-L-Gln, L-Val-L-Ala-L-Tyr, L-Leu-L-Ala-L-Tyr, L-Leu-L-Ser-L-His 및 그 산부가염, L-Leu-L-Arg-L-Pro 및 그 산부가염, 및 L-Ile-L-Arg-L-Ala-L-Gln-L-Gln 및 그 산부가염으로 이루어지는 군에서 선정되는 1종 이상을 유효성분으로서 안지오텐신 변환효소저해제를 제공한다.
Patent KR-100209125-B1 (KR)
Title: Fabric light control window covering
Inventor: COLSON WENDELL B
IPC: G11C29/00
Filed: 1991-07-15
Granted: 1999-07-15
Abstract: A fabric light control window covering in which fabric vanes 10a are adhesively bonded between two sheer fabric sheets 72,96 such that relative movement between the sheer fabric sheets in a direction perpendicular to the longitudinal direction of the fabric vanes changes the angle of the fabric vanes and, thus, controls the amount of light admitted through the shade. The vanes are bonded to the sheer fabric sheets in a manner which tends to bias the sheer fabric sheets together to the non-light admitting position. Also, disclosed are methods and apparatus for manufacturing the above window covering. The method features linear application of adhesive to the vane material which provides for a uniform appearance in the finished product. A heat setting process and apparatus is disclosed in which the bonded layers of sheer fabrics and vanes are fed between belts over hot and cool surfaces, under uniform tension and pressure. This provides for heat setting of the layers of the window covering to a uniform temperature-size relationship without inducing wrinkles or distortion into the fabric during heat setting. <IMAGE>
Patent KR-950011842-B1 (KR)
Inventor: KATO RIICHI
IPC: G07D11/00
Filed: 1991-08-09
Granted: 1995-10-11
Abstract: 내용 없음.
Patent KR-940003401-B1 (KR)
Title: Memory structure of concurrent i/o operation at the same address for fi-fo
Inventor: KIM HWAN-YONG
IPC: G11C11/40
Filed: 1991-09-20
Granted: 1994-04-21
Abstract: COSA for FIFO comprising first and second subarray (Subarray 1, Subarray 2) including a plurality of unit memory cells consisting of writing access transistor (TR1), saving capacitor (C) and reading access transistor (TR5), a plurality of writing beat lines (In0 - In7) and a plurality of writing word lines (WWL-0 - WWL-X) connected to each of said unit memory cells and writing column address selecting line, characterized in that the FIFO memory comprises a plurality of data latches saving data input from said writing beat line by SAN signal which is activated at the same time with the writing column address selecting signal and connected to the beat lines (In0 - In7) and a data drive which drives the data latches by said SAN signal to enable concurrent I/O at the same address.
Patent KR-940003234-B1 (KR)
Title: Sensor circuit of microwave oven
Inventor: LEE KON-KUK
IPC: H05B6/68
Filed: 1991-09-24
Granted: 1994-04-16
Abstract: Cooking takes more time in a microwave oven which employs an absolute humidity sensor since the sensor requires heating stand-by time. The circuit is provided to reduce this stand-by time. On the initial power-up time, it feeds the 1st current value (90-120 mA) to a bridge circuit (10) thru a switch (30). After some pre-defined time, turn-off the switch (30) and normal current value (30-40 mA) to the bridge circuit (10) via a resistor (R1). Thus, the self heating time of the sensor can be reduced to one-third by supplying high current - three times as high as normal current level - to the bridge circuit at the initial time.
Patent KR-100196984-B1 (KR)
Inventor: NAOTO HIRAMATSU
IPC: C22C38/18
Filed: 1991-10-11
Granted: 1999-06-15
Abstract: 본 발명은 0.03% 이하의 C, 0.25% 미만의 Si, 0.25% 미만의 Mn. 0.03%, 이하의 P, 0.001% 미만의 S, 0.03% 이하의 N, 15 내지 25% 의 Cr, 3 내지 6% 의 Al, 0.01 내지 0.2% 의 1 종 이상의 REM, Y 및 알칼리 토류와, 잔부 Fe 및 불가피적인 불순물로 이루어진 페라이트계 스테인레스 강을 제공하는 것이다. 본 발명에 따른 강은 우수한 내 고온 산화특성을 갖고 특히 이상 산화에 대한 저항성과 높은 인성을 가지므로, 자동차 배기가스 처리용 금속촉매변환기를 위한 박막 기판제조에 적절하다.
Patent KR-100200404-B1 (KR)
Inventor: KRIEGER FRIEDRICH
IPC: F23H17/12
Filed: 1992-02-17
Granted: 1999-06-15
Abstract: 하부공기를 위한 전방의 공기배출개구들과 그리고 후방의 공기공급개구들을 가지며 여기서 화격자봉은 중공의 상자모양의 사다리꼴의 횡단면에 의하여 특징지워지는 연소로용, 특히 쓰레기연소시설용의 화격자봉이 제안되었다. 또 움직일 수 있는 화격자봉의 열들은 2개의 인접한 화격자봉의 열들 사이의 이동거리에 상응하는 양정을 허용하는 상기한 종류의 화격자봉들로된 화격자가 제안된다. 또 화격자봉담체는 냉간의 그리고 열간의 조업상태에서 화격자에게 밀봉한 화격자표면을 주기위하여 아아치형상으로 형성되어있어야 한다.
Patent KR-950003907-B1 (KR)
Title: Lead frame
Inventor: OH SE-HYOK
IPC: H01L23/50
Filed: 1992-03-28
Granted: 1995-04-20
Abstract: The lead Frame for semiconductor chip package permits counting of various chips in size by extending intermal leads and forming bus-bar. The lead frame includes; semiconductor chip having the formed desired circuit; adhesive tape adhered on lower face of the semiconductor chip; bus-bar comprising the supporting portion for supporting the adhesive tape and at least two tie bars fixing the supporting portion; intermal leads mounted on bottom face of the adhesive tape; insulating layer formed on one end of bus-bar; and wires connecting the insulating layer, the bonding pads and the internal leads.
Patent KR-950003581-B1 (KR)
Inventor: ODAGAKI SHIGEKI
IPC: B60G17/018
Filed: 1992-06-26
Granted: 1995-04-14
Abstract: 내용 없음.
Patent KR-960008865-B1 (KR)
Title: Method for manufacturing a capacitor in semiconductor memory device
Inventor: SIM SANG-PIL
IPC: H01L21/822
Filed: 1992-07-15
Granted: 1996-07-05
Abstract: forming a conducting layer (50) over the semiconductor substrate; forming a first pattern (52) confined in the unit of cell on the conducting layer (50); forming a first spacer (54) on the side wall of the first pattern; forming a second spacer (56) on the side wall of the first spacer; forming a storage electrode pattern (50a) by etching the conducting layer (50); removing the first pattern and the second spacer; forming a third spacer (58) on the inside and outside wall of the first spacer; removing the first spacer; forming a storage electrode (100) by etching the storage electrode pattern.
Patent KR-950009347-B1 (KR)
Title: High-frequency low-loss tranceive repeater
Inventor: LEE DON-SHIN
IPC: H04B10/29
Filed: 1992-08-24
Granted: 1995-08-21
Abstract: The apparatus comprises transmission/reception divider, a transmission antenna, broadcasting unit, a directional combiner for control, a variable reducing unit, an amplifier for outputting an output at high speed, a deplexer, low-noise amplifier, and a high-frequency amplifier.
Patent KR-950009008-B1 (KR)
Title: Soot measuring method and its apparatus
Inventor: PAE KUK-HYON
IPC: G01N21/53
Filed: 1992-09-23
Granted: 1995-08-10
Abstract: The method for measuring dust is characterized in that the light emitted from a light source is transmitted to the dust by using a prism, the back dispersion light dispersed from the dust is made to change its path to a light receiving unit via a lens and a total reflection mirror by using the prism, thus measuring the density of the dust.
Patent KR-940007019-B1 (KR)
Title: Compost efflux treating method and apparatus by ozone and activated carbon
Inventor: PARK WAN-CHOL
IPC: C02F11/00
Filed: 1992-10-23
Granted: 1994-08-03
Abstract: The compost toilet flush water is treated by (a) reacting the flush water with ozon, (b) neutralizing the treated flush water with a sulfuric acid as a neutralizing agent, and (c) adsorption-treating the neutralized flush water with active carbon to remove a residual organic material. The treating appts. includes a compost toilet flush-storing tank (1), an ozon generator (5), an ozon reactor (2), a filter feeding water-storing tank (3) and an active carbon adsorption filtering device (4).
Patent KR-0158437-B1 (KR)
Title: Nonwoven filter and method of manufacture
Inventor: HASSENBOEHLER JR CHARLES BERNA
IPC: B01D39/00
Filed: 1991-05-02
Granted: 1998-12-01
Abstract: A filter useful as a cigarette smoke filter is made by convergingly passing a flat restrained meltblown web successively through a heated zone and a trumpet to form a roving. The roving may be processed to make filters. The process results in stretch orientation of longitudinal fibers and bulking due to cross fibers. Primary and secondary pleats formed in the web are bundled into a cylindrical roving. The pleats add bulking to the web and provide fluid permeability through the filter.