baber/WOPTO huggingface dataset:
Patent KR-20060040704-A (KR)
Title: Apparatus for controlling a virtual environment
Inventor: WATT MARK ALAN
IPC: G06T13/40
Filed: 2004-07-14
Abstract: An apparatus for controlling an interactive virtual environment is disclosed. The apparatus comprises means for defining a virtual environment populated by objects, the objects comprising at least avatars and props. objects within the virtual environment may be dynamically attached to and detached from other objects under user control. A prop has associated with it an animation for use when an avatar interacts with the prop, and when the prop is attached to another object the animation remains associated with the prop. When an object is attached to another object, it may inherit the movement of the object to which it is attached.
Patent KR-20060112643-A (KR)
Title: Antenna
Inventor: SHIBATA KAZUHIRO
IPC: H01Q19/13
Filed: 2004-08-05
Abstract: [PROBLEMS] To provide a wide band type antenna having nondirectivity without directivity in the horizontal plane direction and capable of receiving wide band radio, particularly, wide band signals over several GHz. [MEANS FOR SOLVING PROBLEMS] A brass spherical shell antenna element (11) of, for example, 10 mm in diameter is fitted to a brass rod (12) of 2.5 mm in diameter through the upper and lower through-holes (21) thereof in a skewered state. The rod (12) is vertically installed by a nylon resin insulation bush (23) fitted to the center part of a disk-like conductive circular plate (13). A coaxial cable (15) is connected to a connector sleeve (14) formed on the lower surface of the conductive circular plate (13) through a connector (16) so that the rod (12) can be connected to a core and the conductive circular plate (13) can be connected to a shield cable.
Patent KR-20060073602-A (KR)
Title: Solvent stable tinted iridescent film
Inventor: GRANEY DANIEL J
IPC: A61K8/49
Filed: 2004-08-06
Abstract: The present invention provides colored iridescent film comprising a core of substantially parallel layers wherein alternate of the layers comprise a first polymer and the remaining layers comprise a second polymer and at least one of the layers contains organic pigment. The present colored iridescent film may advantageously be used in decorative applications such as glitter.
Patent KR-20060103315-A (KR)
Title: Corrective clothes with crotch
Inventor: OYAMA MAKOTO
IPC: A41C1/02
Filed: 2003-11-28
Abstract: Girdles (short, long) capable of improving the posture of a wearer by acting on muscle around a pelvis, capable of being easily handled, and capable of being worn without uncomfortable feeling, wherein fastening parts in which the magnitudes of fastening forces vary from a portion to a portion are included in the portions of the girdles fitted to the body of the wearer, a fastening cloth part (21) is extended, in worn state, from near the upper part of a gluteal cleft through near the upper part of right and left hip parts and to near right and left greater trochanters and formed of a material with a fastening force, and a body front face fastening cloth part (24) is provided on the front side thereof.
Patent KR-20060085243-A (KR)
Title: Electroluminescent device
Inventor: STEUDEL ANNETTE
IPC: C09K11/06
Filed: 2004-09-17
Abstract: A method of forming an electroluminescent device comprising the steps of: providing a substrate comprising a first electrode for Injecting charge carriers of a first type; forming an electrolumInescent layer having a surface by depositing onto the substrate a composition comprising a host material and a light-emitting dopant monomer of formula (1): A-C-(X)n wherein X represents a polymerlsable group; A represents a light-emitting group; C represents a bond or a spacer group; and n is an integer; rendering at least some of the electroluminescent layer Insoluble in a solvent by polymarlsing the monomer of formula (1); exposing the electrolumineseent layer to the solvent; and depositing a second electrode capable of injecting charge carriers of a second type over the electrolumineseent layer.
Patent KR-20060056410-A (KR)
Title: Withanamide and withanolide compositions and method of use thereof
Inventor: NAIR MURALEEDHARAN G
IPC: A61K31/405
Filed: 2004-08-18
Abstract: Novel isolated and purified withanamides and withanolides are described. In particular, compounds from Withania somnifera fruit are the preferred source of the withanamides and withanolides, although they can be from other plant sources. In addition to their use as powerful antioxidants, the withanamides and withanolides can be useful for the treatment of depression, Alzheimer's Disease, obesity and migraine headaches.
Patent KR-20060089745-A (KR)
Title: Worm type optical disk
Inventor: SUZUKI YOSHIHISA
IPC: G11B7/243
Filed: 2004-09-24
Abstract: An environment-friendly WORM type optical disk not using organic materials. The disk comprises a light transmitting substrate (11) made of biodegradable resin, an absorption buffer layer (13) provided on this substrate (11), and a recording layer (12) provided on the absorption buffer layer (13), wherein the substrate (11) in an area irradiated with light is deformed or deteriorated to form a recording part (55).
Patent KR-20070001917-A (KR)
Title: Gag binding proteins
Inventor: KUNGL ANDREAS J
IPC: C07K14/54
Filed: 2004-12-02
Abstract: A method is provided for introducing a GAG binding site into a protein comprising the steps: - identifying a region in a protein which is not essential for structure maintenance; - introducing at least one basic amino acid into said site and/or deleting at least one bulky and/or acidic amino acid in said site, whereby said GAG binding site has a GAG binding affinity of Kd <= l0mum, preferably <= lmum, still preferred <= 0.lmum, as well as modified GAG binding proteins. ® KIPO & WIPO 2007
Patent KR-20070018835-A (KR)
IPC: A61L2/06
Filed: 2005-01-21
Abstract: 본 발명은 삽입부(7)의 선단부(17)에 있어서, 한쪽 개구(44)를 갖고, 선단부(17) 이외의 부분에 있어서 다른 쪽 개구(26)를 갖는 관로 부재(93)가 삽입 관통되고, 또한 상기 2개의 개구 이외의 부분이 외장 부재에 의해 덮인 내시경이며, 외장 부재에 의해 덮인 내시경의 내부(45)와 외부를 연통하는 외장 부재 개구(37)와, 외장 부재 개구(37)에 설치되어 내부(45)로의 진애의 진입 및 내부(45)의 윤활제의 내시경 외부로의 유출을 방지하기 위한 착탈 가능한 필터(149)를 갖는 내시경(2)과, 내시경(2)의 외부로부터 내시경 내부(45) 및 관로(93) 내에 고온 고압 증기를 공급하는 고온 고압 증기 공급 수단을 구비하는 것을 특징으로 하는 내시경 시스템이다.   
       
     내시경, 필터 유닛, 관로 부재, 필터, 방수 캡
Patent KR-20060127068-A (KR)
Title: Method for producing high cleannes steel excellent in fatigue strength or cold workability
Inventor: SAKAMOTO KOICHI
IPC: C21C7/00
Filed: 2004-12-17
Abstract: A high cleanness steel which is produced by adding, as a Li-containing material, a Li-Si alloy having a Li content of 20 to 40 % and/or Li2CO3 into a molten steel, specifically, at a step wherein a series of molten metal treatments of the adjustment of components, temperature adjustments and the slag smelting have been completed, and which has a total Li content of 0.020 to 20 ppm (on the mass basis) and contains oxide based inclusions having a longer diameter of 20 mum or more in an amount of 1.0 piece or less per 50 g of the steel, wherein the oxide based inclusions being present in the steel contain, in mass %, 15 to 55 % of CaO, 20 to 70 % of SiO2, 35 % or less of Al2O3, 20 % or less of MgO, and 5 to 20 % of Li2O; and a method for the high cleanness steel. The above high cleanness steel is further improved in cold workability or in fatigue characteristics.
Patent KR-20060130639-A (KR)
Title: Method for consolidating and sealing a tube
Inventor: FRANK HARALD
IPC: B29C65/08
Filed: 2005-01-07
Abstract: The invention relates to a method for consolidating and sealing a tube. According to the method, the tube (24) is positioned between a sonotrode (10) and an anvil (22) of an ultrasonic welding device that is associated with the latter, the sonotrode is activated and is displaced in relation to the counter-electrode for consolidating and sealing a tube. The aim of the invention is to automate the consolidation and sealing of a tube without individually entering the data of the tube into an ultrasonic welding device in advance. To achieve this, the tube is positioned and fixed between the sonotrode and the anvil, at least one characteristic variable of the tube is determined when said tube is fixed between the sonotrode and the anvil, stored welding parameters are retrieved based on the characteristic variable(s), the sonotrode is activated and the sonotrode is displaced in relation to the anvil in order to consolidate and seal the tube.
Patent KR-20060135753-A (KR)
Title: One-component epoxy resin composition
Inventor: AMANO HIROSHI
IPC: C08G59/68
Filed: 2005-01-21
Abstract: A one-component epoxy resin composition characterized by containing an epoxy resin having two or more epoxy groups in its molecule (component (1)), a polythiol compound having two or more thiol groups in its molecule (component (2)), a compound that releases a basic component at curing temperatures and is soluble in the component (2) (component (3)) and a compound having Lewis acidity (component (4)). This is a reproducible practicable one-component epoxy resin composition that is a homogeneous mixture of epoxy resin and curing agent, having a strikingly improved satisfactory storage stability and exhibits excellent curability. By virtue of this composition, there can be provided an excellent method of realizing impregnation bonding or thin-film hardening, and further provided a functional product.
Patent KR-20060109991-A (KR)
Title: Movable fence and method of opening/closing movable fence
Inventor: FUJIKI TOMOHIRO
IPC: E01F1/00
Filed: 2005-02-16
Abstract: A movable fence enabling passengers to safely and smoothly get on and off trains by aligning the doorways of the trains with different door positions with the opening parts of platform doors according to the types of trains. The platform doors (1) comprise door guards (5) installed at the end part of the platform oppositely to the incoming train to the platform (80) of a station and door bodies (7a) and (7b) advancing and retreating inside and outside the openings of the door guards (5). Openings for advancing and retreating the door bodies (7a) and (7b) therethrough are formed at both ends of the door guards (5) in the advancing/retreating direction of the door bodies (7a) and (7b), the lengths of the door bodies (7a) and (7b) in the advancing/retreating direction is formed larger than the length of the door guards (5) between both ends thereof so that the openings of the door bodies (7a) and (7b) can be adjusted according to the door openings of the trains. Based on the information on the arrangement of the doors of the incoming train, openings of the door bodies (7a) and (7b) can be controlled by a controller.
Patent KR-20070001958-A (KR)
Title: Composite compositions comprising cellulose and polymeric components
Inventor: DEAN DAVID M
IPC: C08L23/02
Filed: 2005-02-17
Abstract: The present invention is a composite composition comprising cellulosic material in a polymeric matrix comprising a thermoplastic polymer, and at least one compatibilizing copolymer prepared from an olefin and a functional comonomer, and articles prepared from such composites. The composition of the present invention can be useful as a synthetic wood. ® KIPO & WIPO 2007
Patent KR-20060132703-A (KR)
Title: Knitting method for wide rib texture by plating
Inventor: SHIMASAKI YOSHINORI
IPC: D04B1/00
Filed: 2005-01-27
Abstract: A knitting method for providing a neat wide rib tissue by making inconspicuous bleeding at knitting width end parts when a knitting fabric including the wide rib tissue is knitted by a weft knitting machine, particularly, by a plating using upper yarn and under yarn different in color from each other. By using the weft knitting machine, at the knitting width end parts on a side where the crossings of knitting yarn used for the plating are produced, one knitting fabric is formed in the face stitches of the rib tissue and the other is formed in the back stitches of the rib tissue. After the face stitches of the rib tissue of one knitting fabric is knitted, the knitting direction is changed and then the back stitches of the rib tissue of the other knitting fabric is knitted to position the crossings at the connecting parts of wide ribs so as to make inconspicuous the bleeding of the knitting yarn.
Patent KR-20070007089-A (KR)
Title: Electronic circuit
Inventor: KURODA TADAHIRO
IPC: H01L25/07
Filed: 2005-02-14
Abstract: An electronic circuit for efficiently transmitting a signal even if it transmits the signal over three or more boards three-dimensionally mounted. Three LSI chips are stacked, and a path over the three LSI chips is formed. On the first to third LSI chips (11a, 11b, 11c), first to third transmission coils (13a, 13b, 13c) and first to third reception coils (15a, 15b, 15c) are formed by wiring. Three centers of the openings of the three pairs of transmission and reception coils are aligned. Therefore, the three pairs of transmission and reception coils are inductively coupled to enable communication. First to third transmission circuits (12a, 12b, 12c) are respectively connected to the first to third transmission coils (13a, 13b, 13c), and first to third reception circuits (14a, 14b, 14c) are respectively connected to the first to the third transmission coils (15a, 15b, 15c). ® KIPO & WIPO 2007
Patent KR-20060118001-A (KR)
Title: Optical component-use molding and production method therefor
Inventor: HATTORI TOSHIAKI
IPC: G02B5/00
Filed: 2005-01-28
Abstract: An optical component-use molding imparted with a high-regularity construction having its refractive index changed cyclically on the order of about 80nm to 1000mum, and applicable to general optical use such as an optical sheet and an optical film; and a production method therefor. The optical component-use molding, obtained by photopolymerizing a photopolymerizing composition, comprises a matrix and many columnar structures arranged in one direction in the matrix, wherein the columnar structures have a refractive index different from that of the matrix, are arranged in a lattice form in a plane orthogonal to the above orientation direction, and have a high-regularity construction having its refractive index changed cyclically on the order of 80nm to 1000mum.
Patent KR-20070009590-A (KR)
Title: Process for the preparation of propylene oxide
Inventor: JUBIN JOHN C JR
IPC: C07D301/03
Filed: 2005-02-08
Abstract: Propylene oxide is formed in a two step reaction wherein in a first step oxygen and hydrogen are reacted in the absence of propylene to form hydrogen peroxide and in a second step propylene is reacted with the formed hydrogen peroxide to form propylene oxide, the same solid noble metal on TS-1 catalyst being used to catalyze the reaction in each step. ® KIPO & WIPO 2007
Patent KR-20070021170-A (KR)
IPC: G11B20/12
Filed: 2006-02-22
Abstract: BCA 데이터는 2개의 BCA 프리앰블과, 2개의 BCA 포스트앰블과, 2개의 BCA 데이터 영역을 포함한다. 각 BCA 데이터 영역에는 BCA 에러 검출 코드와 BCA 에러 정정 코드가 부가된다. 같은 정보 아이템이 2개의 BCA 데이터 영역에 다중 기록되고 있다. 이 때문에, 기억 매체의 표면에 생긴 먼지 또는 긁힘의 영향으로 한쪽의 데이터 아이템이 재생 불가능하게 되더라도, 다른 쪽의 BCA 데이터 영역으로부터 데이터가 재생될 수 있어, 데이터의 신뢰성이 향상된다.
Patent KR-20060132040-A (KR)
Title: Face image creation device and method
Inventor: NISHIMORI TAKASHI
IPC: G06T11/60
Filed: 2005-04-15
Abstract: A face image creation device (100) creates a first face image in which face parts for creating the first face image are arranged at positions based on the position of each face part in a second face image. The face image creation device (100) includes: a position calculation physical feature extraction unit (103) for receiving input of the second face image, extracting each of the face parts from the second face image, and calculating the position of each of the face parts in the second face image; a face feature storage unit (104) for storing reference position of each of the face parts in a reference face image; a plot rule storage unit (106) for storing the default position of each of the face parts for creating the first face image in the first face image; and a portrait synthesis unit (108) for deciding the position where each of the face parts for creating the first face image is arranged, according to the comparison result between the position of each face part in the second face image calculated and the position of each face part in the reference face image, and the comparison result between the distance between the default positions and the distance between the reference positions for a pair of a particular face part.
Patent KR-20070030786-A (KR)
IPC: G06F15/00
Filed: 2005-07-07
Abstract: 다른(異) 디바이스 사이의 데이터 전송(轉送)을 수반하는 컨텐츠 이용에서의 정보 누설(漏洩), 컨텐츠 부정(不正) 처리를 방지하는 구성을 제공한다. 드라이브와 호스트 등 다른 디바이스 사이의 데이터 전송을 수반하는 컨텐츠의 재생 혹은 기록 처리에서, 컨텐츠의 암호화 또는 복호 처리에 적용하는 미디어 ID(디스크 ID)를, 미디어로부터 판독(讀取; read)하고, 이것이 올바른(正; exact, correct) 정당(正當)한 미디어에 설정된 헤더 코드에 대응해서 기록되어 있는지를 드라이브 측에서 검증(檢證)하고, 검증에 의해서, 정당 미디어라고 확인된 경우, 드라이브 측에서 미디어 ID를 암호화해서 호스트에 출력한다. 본 구성에 의해, 미디어 ID의 외부 누설의 방지, 부정 미디어를 이용한 컨텐츠의 재생 또는 기록 처리의 방지가 실현된다.
Patent KR-20070012509-A (KR)
Title: Universal medication carrier
Inventor: BOGASH ROBERT C
IPC: G07F11/00
Filed: 2004-12-15
Abstract: A medication carrier for administering individual doses of therapeutic products to a patient, in a non- sequential fashion. The medication carrier comprises a receptacle which stores individually sealed, unit dose packages in random order, allowing each unit dose package to be easily accessed and released in response to automated or manual extraction. The medication carrier includes an array of stalls and retaining means for securing the sealed unit dose packages within the stalls until a scheduled dosing time. The unit dose packages are oriented such that identifiers imprinted thereon can be easily read without removing the packages from the carrier. ® KIPO & WIPO 2007
Patent KR-20070015217-A (KR)
Title: Carbonated beverage dispenser
Inventor: GRANT ROBERT P
IPC: B65D1/20
Filed: 2005-05-04
Abstract: The bottle may include an expanded rear end, an offset spout, and a substantially flat side positioned between the expanded rear end and the offset spout. ® KIPO & WIPO 2007
Patent KR-20070011564-A (KR)
Title: Methods and compositions using selective cytokine inhibitory drugs for treatment and management of cancers and other diseases
Inventor: ZELDIS JEROME B
IPC: A61K31/4035
Filed: 2004-05-05
Abstract: Methods of treating, preventing and/or managing cancer as well as and diseases and disorders associated with, or characterized by, undesired angiogenesis are disclosed. Specific methods encompass the administration of a selective cytokine inhibitory drug alone or in combination with a second active ingredient. The invention further relates to methods of reducing or avoiding adverse side effects associated with chemotherapy, radiation therapy, hormonal therapy, biological therapy or immunotherapy which comprise the administration of a selective cytokine inhibitory drug. Pharmaceutical compositions, single unit dosage forms, and kits suitable for use in methods of the invention are also disclosed. ® KIPO & WIPO 2007
Patent KR-20070034016-A (KR)
Title: 디스플레이 응용을 위한 저전력 소비 ｏｌｅｄ 물질
IPC: H01L51/40
Filed: 2005-05-13
Abstract: 본 발명의 소정의 실시예들은 디스플레이 디바이스들에서 유용한 OLED 물질들 및 그러한 OLED 물질들을 만드는 공정에 관한 것이다.  OLED 물질들은 하나 또는 그 이상의 기판에 통합된 극성 화합물들을 포함할 수 있다. 극성 화합물들이 인가된 전압 또는 전기장에, 경화됨과 동시에 노출되는 경우, 극성 화합물은 전압의 방향으로 배향될 수 있다. 그러한 배향은 OLED 물질로부터 방사된 광이 단일 방향으로 복사하게 한다.   대안적인 실시예들은 다이폴들이 단일 방향으로 배향된 극성 발광층을 갖는 디스플레이 디바이스를 포함하는 시스템에 관한 것이다. 
       
     OLED 물질, 디스플레이 디바이스, 극성 발광 물질, 저전력, 배향층
Patent KR-20080065452-A (KR)
Title: Built-in cooking appliance and installation device for the same
Inventor: YI SOO CHEOL
IPC: F24C15/30
Filed: 2007-01-09
Abstract: A built-in cooking appliance and an installation device for the same are provided to form a rear opening part in a portion of a top cover in the contact with a cabinet in order to allow air to flow. A built-in cooking appliance includes a top plate(5), a body frame(4), a cabinet, and a top cover(6). The body frame is provided under the top plate and receives at least one heater. The cabinet is provided with a receiving part(2) in which the tip plate is installed. At least one edge of the top plate is spaced apart from the cabinet and has an interval part for flowing air. The top plate includes a top cover to cover the interval part. One edge of the body frame extends beyond an end part of the top plate and is supported by the cabinet.
Patent KR-20070015972-A (KR)
IPC: B32B27/08
Filed: 2007-01-17
Abstract: 본 발명은 인강강도 및 복원력이 우수한 파렛트 포장용 비닐 포장재에 관한 것이다. 본 발명의 파렛트 포장용 비닐 포장재는 선형저밀도 폴리에틸렌(LLDPE) 70 내지 80 중량% 및 저밀도 폴리에틸렌(LDPE) 20 내지 30 중량%로 이루어진 A층; 에틸렌비닐아세테이트로 이루어진 B층; 및 선형저밀도 폴리에틸렌(LLDPE) 80 중량%, 저밀도 폴리에틸렌(LDPE) 15 중량% 및 첨가제 5 중량%로 이루어진 C층으로 이루어진 것으로, A층 및 C층에 선형저밀도 폴리에틸렌(mLLDPE 또는 옥텐LLDPE)과 저밀도 폴리에틸렌(LDPE)을 혼용하여 사용함으로써 우수한 인장강도 및 가공성이 부여되고, 상기 A층 및 C층 사이에 에틸렌비닐아세테이트(EVA)로 이루어진 B층을 구비함으로써 복원력이 발현되어, 적재물을 보호하고 운반시에 유동을 방지할 수 있다. 
       
     선형저밀도 폴리에틸렌(mLLDPE 또는 옥텐LLDPE), 에틸렌비닐아세테이트(EVA), 저밀도 폴리에틸렌(LDPE), 파렛트 포장
Patent KR-20070020540-A (KR)
IPC: F21S13/10
Filed: 2007-01-31
Abstract: 본 발명에 따른 가로등은 램프를 지지하는 램프지지암(204, 404)으로부터 연장되어 하부 내측으로 함몰된 다각형의 뚜껑(206, 406)을 구비하는 거치부, 및 상기 거치부의 뚜껑(206, 406)에 상응하여 끼워지는 다각형의 돌출 헤드(210, 410)를 구비하고 돌출 헤드(210, 410)의 하부는 상기 뚜껑(206, 406)의 저면 모서리 부분이 걸치어지도록 단턱지며 상기 헤드(210, 410)상에는 그 외벽과 이격되어 구비되는 제1 홀(212, 412)을 구비하는 상부 폴(240, 440)을 포함하는 것을 특징으로 한다. 
     본 발명에 따르면 풀림을 방지하여 가로등의 위치가 틀어지지 않고 전선과의 마찰을 최소화하여 감전 요인을 줄이면서 미관을 해치지 않는 가로등이 제공된다. 
       
     가로등, 다각형, 절연 파이프
Patent KR-20070035009-A (KR)
Title: 에멀젼 연료용 물 제조방법
IPC: C09K3/00
Filed: 2007-02-12
Abstract: 본 발명은 폐유와 경유, 등유 또는 벙커C유를 물과 혼합하여 에멀젼 화하여 연료로 사용할 때 쓰는 물 제조에 관한 것으로서 물이 기름(폐유와 경유, 등유 또는 벙커C유)과 혼합이 잘되도록 활성수소를 다량 함유하도록 하는 환원수기를 통과시킨 환원수와 결빙방지 역활을 하는 과산화수소수 그리고, 연소 시 황산화물과 질산화물의 발생을 저감시키는 촉매제와 물과 기름(폐유와 경유, 등유 또는 벙커C유)을 혼합시키는 계면활성제를 혼합하여 에멀젼 연료 생산 시 사용되는 에멀젼 연료용 물 제조방법에 관한 것이다. 
       
     에멀젼 연료, 촉매, 계면활성제
Patent KR-20080076095-A (KR)
Title: Lighting apparatus installed under ground
Inventor: KIM DONG HO
IPC: F21S8/02
Filed: 2007-02-14
Abstract: A lighting apparatus installed underground is provided to emit the light colors with pattern different from a previous pattern whenever a walker steps on the lighting apparatus installed underground. A lighting apparatus installed underground includes a main body(110), a light emitting module, a cap(130), a pressure sensor(140), and a drive part. The main body has an opening and a seating groove. The light emitting module is mounted in the seating groove. The cap is installed to shield the opening of the main body. The pressure sensor is installed at a horizontal part of a coupling groove(116) to output a signal corresponding to variation in weight of the cap. The drive part controls the light emitting module to change a drive pattern according to a set sequence.
Patent KR-20080076147-A (KR)
Title: Shock absorber having free piston
Inventor: YANG SEUNG KOOK
IPC: F16F9/34
Filed: 2007-02-15
Abstract: A shock absorber having a free piston is provided to limit the excessive movement of a free piston toward the position contacted with a piston valve by forming a stopper. A shock absorber having a free piston comprises a tube(10) wherein a piston valve is reciprocated, a free piston(30), and a stopper(14). The free piston vertically moved by reciprocation of the piston valve divides the inside of the tube into an oil room(10a) and a gas room(10b). The stopper is placed inside the tube to limit the excessive movement of the free piston. The stopper is also positioned between the bottom dead center of the piston valve and the top dead center of the free piston.