NO20080227L - Fremgangsmate og anordning for innvendig avkjoling av ekstruderte termoplastror - Google Patents
Fremgangsmate og anordning for innvendig avkjoling av ekstruderte termoplastrorInfo
- Publication number
- NO20080227L NO20080227L NO20080227A NO20080227A NO20080227L NO 20080227 L NO20080227 L NO 20080227L NO 20080227 A NO20080227 A NO 20080227A NO 20080227 A NO20080227 A NO 20080227A NO 20080227 L NO20080227 L NO 20080227L
- Authority
- NO
- Norway
- Prior art keywords
- cooling
- thermoplastic tube
- tube
- refrigerant
- thermoplastic
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
- B29C48/902—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies internally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9115—Cooling of hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92514—Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/926—Flow or feed rate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92923—Calibration, after-treatment or cooling zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92952—Drive section, e.g. gearbox, motor or drive fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/904—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article using dry calibration, i.e. no quenching tank, e.g. with water spray for cooling or lubrication
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/905—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article using wet calibration, i.e. in a quenching tank
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9115—Cooling of hollow articles
- B29C48/912—Cooling of hollow articles of tubular films
- B29C48/913—Cooling of hollow articles of tubular films externally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Oppfinnelsen vedrører en fremgangsmåte og anordning for avkjøling av et ekstrudert termoplastrør (1), ved å lede et gassformig kjølemedium tangensielt mot den innvendige flaten av termoplastrøret (1) langs hele dens omkrets, hvormed det innvendige av termoplastrøret (1) deles opp ved hjelp av et beskyttende rør (8) til en utvendig ringformet strømningskanal (9) for avkjølingsmediet langs den innvendige flaten av termoplastrøret (1), og en sentrisk returkanal (10) gjennom hvilken en del av kjølemediet er ment å bli suget tilbake under påvirkning av strømmen av kjølemediet i den utvendige ringformete strømningskanalen (9), og for å bli omdirigert mot den innvendige flaten av termoplastrøret (1), oppfinnelsen er karakterisert ved at det kjølemediet er luft, og at det er kjøleutstyr (6) montert i returkanalen (10), hvormed i det minste temperatur og strømningshastighet for kjølevannet ført til kjøleutstyret (6), og muligens også av kjøleluften som mate inn i termoplastrør (1), justeres og reguleres basert på dimensjon og ekstrusjonshastighet av termoplastrøret (1) som tilvirkes.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20050634A FI20050634A (fi) | 2005-06-15 | 2005-06-15 | Menetelmä ja laite ekstrudoitujen kestomuoviputkien sisäiseksi jäähdyttämiseksi |
PCT/FI2006/050253 WO2006134228A1 (en) | 2005-06-15 | 2006-06-13 | Method and device for internal cooling of extruded thermoplastics pipes |
Publications (1)
Publication Number | Publication Date |
---|---|
NO20080227L true NO20080227L (no) | 2008-03-17 |
Family
ID=34778354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO20080227A NO20080227L (no) | 2005-06-15 | 2008-01-14 | Fremgangsmate og anordning for innvendig avkjoling av ekstruderte termoplastror |
Country Status (8)
Country | Link |
---|---|
US (1) | US8062013B2 (no) |
EP (1) | EP1890859A4 (no) |
CA (1) | CA2612163A1 (no) |
FI (1) | FI20050634A (no) |
NO (1) | NO20080227L (no) |
RU (1) | RU2410240C2 (no) |
WO (1) | WO2006134228A1 (no) |
ZA (1) | ZA200711067B (no) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008047209A1 (de) * | 2008-09-15 | 2010-04-15 | Cincinnati Extrusion Gmbh | Vorrichtung und Verfahren zum Kühlen von Kunststoffprofilen |
DE102010025524A1 (de) * | 2010-06-29 | 2011-12-29 | Kraussmaffei Technologies Gmbh | Vorrichtung zum Erzeugen eines hohlen Kunststoffprofiles |
GB201318252D0 (en) * | 2013-10-15 | 2013-11-27 | Ap Plastics Ltd | Blown film extrusion system and process |
CN104002465B (zh) * | 2014-05-15 | 2016-06-29 | 华南理工大学 | 一种胀-微缩式双轴向拉伸管连续成型方法及设备 |
CN110091493B (zh) * | 2019-04-28 | 2024-02-02 | 重庆爱博塑业有限公司 | 一种ps片材定型装置 |
RU2769197C2 (ru) * | 2020-05-27 | 2022-03-29 | Федеральное государственное автономное образовательное учреждение высшего образования "Сибирский федеральный университет" | Устройство завихрителя потоков воздуха для охлаждения экструдированных масс |
CN113635531B (zh) * | 2021-08-03 | 2023-03-17 | 青岛英诺包装科技有限公司 | 一种bopp包装膜的制备及其生产工艺 |
CN113977902B (zh) * | 2021-10-12 | 2024-02-02 | 安徽瑞远管道有限公司 | 一种快速冷却定型的pe给水管注塑设备 |
CN115648502B (zh) * | 2022-11-16 | 2023-06-30 | 湖南诚路管业科技有限公司 | 一种节能型hdpe给水管快速冷却设备 |
CN117283849B (zh) * | 2023-10-23 | 2024-05-31 | 徐州天富达塑业有限公司 | 一种塑料管加工装置 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB828851A (en) | 1957-01-01 | 1960-02-24 | British Cellophane Ltd | Improvements in or relating to the manufacture of thin-walled tubing from thermoplastic materials |
GB1104079A (en) | 1964-03-26 | 1968-02-21 | Plastics Kogyo Co Ltd | Apparatus for producing synthetic resin tubes |
US3329999A (en) * | 1965-08-16 | 1967-07-11 | Nat Distillers Chem Corp | Internal air ring |
DE1504804A1 (de) | 1965-08-28 | 1969-09-18 | Reifenhaeuser Kg | Verfahren zum Kuehlen des aufgeweiteten Folienschlauches bei Folienblasanlagen |
NO119195B (no) * | 1965-10-27 | 1970-04-06 | J Thordarson | |
CH549455A (fr) | 1971-09-28 | 1974-05-31 | Sig Schweiz Industrieges | Procede de fabrication d'un film tubulaire en matiere plastique, installation pour la mise en oeuvre de ce procede et film obtenu par ce procede. |
DE2357993C2 (de) * | 1973-11-21 | 1983-11-17 | Reifenhäuser KG, 5210 Troisdorf | Vorrichtung zur Innenkalibrierung von Hohlprofilen aus thermoplastischem Kunststoff |
DE2523975A1 (de) | 1975-05-30 | 1976-12-16 | Veba Chemie Ag | Vorrichtung zur herstellung spannungsarmer rohre aus thermoplastischem kunststoff |
DE2652641C2 (de) | 1976-11-19 | 1978-12-14 | Reifenhaeuser Kg, 5210 Troisdorf | Einrichtung zur Innenkühlung von Kunststoffhohlprofilen |
US4698196A (en) | 1985-12-24 | 1987-10-06 | Xerox Corporation | Method and apparatus for extruding creaseless thin walled tubes |
US5447665A (en) * | 1986-03-31 | 1995-09-05 | Nupipe, Inc. | Method of removal of replacement pipe installed in an existing conduit |
AT409474B (de) * | 1992-09-01 | 2002-08-26 | Greiner & Soehne C A | Extrusionswerkzeug für mit zumindest einem hohlraum versehene bauteile sowie verfahren zum herstellen derartiger bauteile |
US5525289A (en) * | 1995-01-30 | 1996-06-11 | Lupke; Manfred A. A. | Method and apparatus for cooling hollow molded product |
EP0857561B1 (de) | 1997-02-05 | 2003-09-10 | Linde AG | Verfahren und Vorrichtung zur Kühlung extrudierter Hohlprofile |
HUP0301174A2 (hu) | 2003-04-30 | 2005-03-29 | Dr-Pack Ii. Kft. | Eljárás és berendezés extrudált műanyag fóliatömlők hűtésére |
-
2005
- 2005-06-15 FI FI20050634A patent/FI20050634A/fi not_active IP Right Cessation
-
2006
- 2006-06-13 EP EP06755415A patent/EP1890859A4/en not_active Withdrawn
- 2006-06-13 WO PCT/FI2006/050253 patent/WO2006134228A1/en active Application Filing
- 2006-06-13 CA CA002612163A patent/CA2612163A1/en not_active Abandoned
- 2006-06-13 ZA ZA200711067A patent/ZA200711067B/xx unknown
- 2006-06-13 US US11/917,694 patent/US8062013B2/en not_active Expired - Fee Related
- 2006-06-13 RU RU2007149041/05A patent/RU2410240C2/ru not_active IP Right Cessation
-
2008
- 2008-01-14 NO NO20080227A patent/NO20080227L/no not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
RU2410240C2 (ru) | 2011-01-27 |
CA2612163A1 (en) | 2006-12-21 |
US8062013B2 (en) | 2011-11-22 |
US20090139695A1 (en) | 2009-06-04 |
FI20050634A0 (fi) | 2005-06-15 |
EP1890859A4 (en) | 2011-08-24 |
ZA200711067B (en) | 2009-06-24 |
FI20050634A (fi) | 2006-12-16 |
EP1890859A1 (en) | 2008-02-27 |
RU2007149041A (ru) | 2009-07-10 |
WO2006134228A1 (en) | 2006-12-21 |
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Legal Events
Date | Code | Title | Description |
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FC2A | Withdrawal, rejection or dismissal of laid open patent application |