WO2000027764A1 - Method and device for removing a mandrel during the production of a quartz glass pipe - Google Patents
Method and device for removing a mandrel during the production of a quartz glass pipe Download PDFInfo
- Publication number
- WO2000027764A1 WO2000027764A1 PCT/EP1999/008344 EP9908344W WO0027764A1 WO 2000027764 A1 WO2000027764 A1 WO 2000027764A1 EP 9908344 W EP9908344 W EP 9908344W WO 0027764 A1 WO0027764 A1 WO 0027764A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blank
- mandrel
- abutment
- pulling
- longitudinal axis
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01466—Means for changing or stabilising the diameter or form of tubes or rods
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/14—Other methods of shaping glass by gas- or vapour- phase reaction processes
- C03B19/1469—Means for changing or stabilising the shape or form of the shaped article or deposit
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/14—Other methods of shaping glass by gas- or vapour- phase reaction processes
- C03B19/1484—Means for supporting, rotating or translating the article being formed
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01486—Means for supporting, rotating or translating the preforms being formed, e.g. lathes
Definitions
- the invention relates to a method for removing a dome from a porous SiO 2 blank formed by depositing SiO 2 particles on the cylindrical surface of the dome rotating about its longitudinal axis, which is then sintered to produce a tube made of synthetic quartz glass.
- the invention relates to a device for removing a mandrel from a porous SiO 2 blank formed by the deposition of SiO 2 particles on the cylindrical surface of the mandrel.
- a method according to the type mentioned at the outset is known from US Pat. No. 4,362,545. Then, in order to produce a preform for optical fibers using a flame hydrolysis burner, SiO 2 particles are deposited in layers on the cylindrical surface of a slightly conical mandrel that is clamped at both ends in a lathe and rotates about its longitudinal axis. A back and forth movement along the longitudinal axis of the mandrel forms an elongated, porous blank made of SiO 2 particles. Aluminum oxide, quartz, graphite or silicon carbide are recommended as suitable materials for the production of the mandrel. The mandrel is usually removed before further processing of the blank, for example by glazing or collapsing.
- the present invention is therefore based on the object of specifying an inexpensive method for removing a mandrel in the production of tubes made of quartz glass, which facilitates the use of an inexpensive, cylindrical mandrel, and to provide a suitable device for removing the mandrel.
- this object is achieved on the basis of the method described at the outset in accordance with the invention in that, in order to remove the mandrel, an end face of the blank is fixed and aligned in a receptacle which comprises a passage and a fixed abutment made of a deformable mass
- the mandrel extends through the passage, a tensile or pushing force acting in the direction of the longitudinal axis of the dome, by means of which the end of the blank is pressed against the abutment, being applied to the mandrel and continuously increased until the mandrel detaches from the blank.
- the blank is brought into a predetermined orientation and position.
- at least one of the two front ends of the blank is fixed and aligned in a receptacle.
- the recording includes an abutment made of a deformable mass. It is provided with a passage through which the mandrel extends. The opening width of the passage is larger than the outside diameter of the mandrel, but smaller than the outside diameter of the blank.
- the mandrel can be removed from the blank by pulling it out or by pushing it out. In any case, the end of the blank is pressed against the abutment when a pulling or pushing force acting on the mandrel in the direction of the longitudinal axis of the dome and counter to the abutment is pressed.
- the ends of the blanks usually taper outwards.
- the outer surface in the region of the tapered ends is suitable as a fixing surface for aligning the blank in the receptacle, and at the same time serving as a pressing surface, it can be pressed against the abutment.
- the fact that the exact geometry of the blank ends can vary is taken into account in that the abutment comprises a deformable mass which adapts to the respective geometry of the blank end. The abutment is therefore able to accommodate differently shaped blank ends.
- the deformable mass of the abutment can be elastically or plastically deformable.
- the end of the blank is pressed against the deformable mass of the abutment. Due to the deformation of the mass and its adaptation to the respective geometry of the blank, the force is distributed over a larger area in the area of the blank end; This prevents damage to the blank.
- the force acting on the mandrel is continuously increased until the mandrel releases from the blank.
- continuous here means a continuous or a gradual increase in strength.
- the method according to the invention can be used for the removal of any mandrel of any design, in particular it facilitates the removal of a cylindrical mandrel.
- a procedure is particularly preferred in which an abutment made of an elastically deformable mass is used. Compared to an abutment made of a plastically deformable mass, this procedure has the advantage that the geometry of the abutment regresses after the blank is removed, so that the initial geometry of the abutment is always the same regardless of the previous use.
- the method according to the invention is particularly advantageous if the blank is formed with an end that tapers outwards in a tapering area, and the opening of the abutment is designed with an inner cone that narrows in the direction of action of the tensile or pushing force, due to the action on the mandrel Pulling or pushing force, the tapered area of the blank is pressed against the inner cone.
- the blank end and the abutment are coordinated favorably with one another, particularly with regard to the fixing of the blank and the distribution of the compressive forces acting on the blank.
- the tapering area offers a large area for fixing the blank in the receptacle
- the tapering area is applied to the inner wall of the inner cone over a large area due to the tensile or pushing force acting on the mandrel and the deformability of the abutment, so that the compressive forces acting on the end of the blank are distributed over a large surface.
- the inner cone of the abutment which has a central axis that extends in the direction of the pulling or pushing force acting on the mandrel, contributes to self-centering of the blank in this direction and thus prevents tilting when removing the mandrel.
- a method has proven to be particularly suitable in which the tensile or pushing force is applied by means of a pulling or pushing device which can be displaced in the direction of the longitudinal axis of the mandrel.
- a pulling or pushing device which can be displaced in the direction of the longitudinal axis of the mandrel.
- the pulling or pushing device acting on the mandrel is displaced exactly in the direction of the longitudinal axis of the dome, the bending forces acting on the blank are kept as low as possible; Canting is avoided. This can be ensured particularly simply by mounting the receptacle for the blank and the pulling or pushing device on a common linear guide, the blank being fixed in the receptacle in such a way that the dome longitudinal axis extends in the guide direction of the linear guide.
- a holding device for fixing and aligning the blank which comprises a receptacle for a front end of the blank, which is provided with an abutment made of a deformable mass, and which has a passage, through which the mandrel extends, and with a pulling or pushing device acting on the mandrel and acting in the direction of the longitudinal axis of the dome, by means of which the end of the blank connected to the mandrel can be moved against the abutment.
- the at least one receptacle is used to fix, store and align the blank when removing the mandrel.
- the recording includes an abutment made of a deformable mass. It is provided with a passage through which the mandrel extends. The opening width of the passage is larger than the outside diameter of the mandrel, but smaller than the outside diameter of the blank.
- a pulling or pushing device is provided which engages on the mandrel and thereby generates a pulling or pushing force acting in the direction of the longitudinal axis of the dome.
- the pulling or pushing device acts on one of the mandrel ends protruding from the blank, namely on the mandrel end extending through the abutment in the case of a pulling force, and on the opposite mandrel end in the case of a pushing force. It is essential that the mandrel, and thus the blank connected to the mandrel by friction, moves in the direction of the abutment due to the pulling or pushing force, so that the end face of the blank facing the abutment is pressed against the abutment.
- the ends of the blanks usually taper outwards.
- the outer surface in the region of the tapered ends is suitable as a fixing surface for aligning the blank in the receptacle, and at the same time serving as a pressing surface, it can be pressed against the abutment.
- the fact that the exact geometry of the blank ends can vary is taken into account in that the abutment comprises a deformable mass which adapts to the respective geometry of the blank end. The abutment is therefore able to accommodate differently shaped blank ends.
- the holding device can have a corresponding receptacle for each face-side end of the blank.
- the deformable mass of the abutment can be elastically or plastically deformable.
- an abutment is preferred which comprises an elastically deformable mass.
- Such an abutment has the advantage over an abutment made of a plastically deformable mass that the geometry of the abutment regresses after the blank is removed, so that the initial geometry of the abutment is always the same regardless of the previous use.
- An elastically deformable mass consisting of polymerized silicone has proven to be particularly suitable. Such a mass is permanently elastic and firm. It can be produced, for example, by vulcanization of liquid silicone components and its geometry can easily be adapted to the intended use.
- An embodiment of the device in which the abutment has a funnel-shaped opening has proven particularly useful. The mandrel of a blank fixed in the receptacle extends through the funnel-shaped opening, while the front end of the blank lies against the inner wall of the opening.
- the opening is advantageously provided with an inner cone which narrows in the direction of movement of the pulling or pushing device, and against which, by means of the pulling or pushing device, an end of a blank fixed in the receptacle which tapers outward in a tapering region can be moved.
- the blank end and the abutment are particularly advantageously matched to one another with regard to the fixing of the blank and the distribution of the compressive forces acting on the blank. Because on the one hand the tapering area offers a large area for fixing the blank in the receptacle, and on the other hand, due to the tensile or pushing force acting on the mandrel, the tapering area lies against a large area on the inner wall of the inner cone, so that the taper acting pressure forces are distributed over a large surface.
- the inner cone of the abutment which has a central axis that extends in the direction of the pulling or pushing force acting on the mandrel, contributes to self-centering of the blank and thus prevents mutual tilting when the mandrel is removed from the blank.
- the common linear guide for the holding device of the blank, on the one hand, and for the pulling or pushing device, on the other hand, makes it particularly easy and reproducible to apply a pulling or pushing force to the mandrel, which acts exactly in the direction of the longitudinal axis of the dome.
- FIG. 1 shows a device according to the invention in a side view, partly in section
- FIG. 2 shows the device according to FIG. 1 in a top view
- Figure 3 is a side view of a receptacle for the blank for use in the device according to the invention in a section, and
- Figure 4 is a front view of the receptacle according to Figure 3, seen in the direction of the arrow "X".
- the base part of the device according to FIG. 1 is a linear module 1, in which three clamping tables 2, 3, 4 are arranged in a row one behind the other.
- the front clamping table 2 receives a clamping tool 5 for a blank 6.
- the clamping tool 5 comprises a slotted collet 7, a nut 8 and a collet holder 9 provided with a hollow cone. By tightening the nut 8, the collet 7 is pulled into the hollow cone of the collet holder 9.
- the pull collet 7 is a collet according to DIN 6341.
- the front clamping table 2 is connected to a handwheel 10 via a spindle and can be moved by turning the handwheel 10.
- a left receptacle 11 for the blank 6 is rigidly mounted on the middle clamping table 3.
- the receptacle 11 consists of a stainless steel housing 12 into which a one-piece silicone clamping mold 13 is housed.
- the silicone clamping mold 13 the structural details of which can be seen in FIGS. 3 and 4, is formed with a funnel-shaped opening 31 which opens into a passage 15 in the stainless steel housing 12.
- the silicone clamping mold 13 is oriented such that the central axes of the funnel-shaped opening 31 and the passage 15 run parallel to the guide direction 16 of the linear module 1.
- a right receptacle 17 for the blank 6 is mounted on the rear clamping table 4.
- This is designed exactly like the left receptacle 11, a silicone clamping mold 19 being housed in a stainless steel housing 18, the shape, dimensions and manufacture of which are explained in more detail below with reference to FIGS. 3 and 4.
- the two silicone clamping molds 13 are mounted in their respective stainless steel housings 12, 18 so that their maximum openings lie opposite one another and the passages 15, 20 of the stainless steel housings 12, 18 from one another point away.
- the rear clamping table 4 is connected via a spindle to a handwheel 21 and can thus be moved in the guide direction 16 of the linear module 1.
- the blank 6 extends between the two receptacles 11, 17.
- the blank 6 is in the form of a so-called porous soot body with a length of approximately 100 cm and an outer diameter of approximately 10 cm, with the two ends of the blank 6 following rejuvenate on the outside.
- the end facing the receptacle 11 is designated in FIG. 1 by the reference number 25, the tapering region of the end by the reference number 26.
- the blank 6 is held on a cylindrical support tube 22 made of aluminum oxide, which in the exemplary embodiment has an outer diameter of 8 mm, and that protrudes from the blank 6 on both sides.
- the blank 6 and the support tube 22 have the same central axis 23.
- the conical end 25 of the blank 6 projects into the clamping molds 13 in such a way that the tapering region 26 abuts an inner wall of the opening 31. Accordingly, the opposite end of the blank 6 is held in the receptacle 17.
- the ends of the support tube 22 extend through the respective passages 15, 20.
- the left end of the support tube 22 is held in the tension collet 7, the tension axis 24 of the tension collet 7 extending exactly coaxially with the central axis 23 of the support tube 22.
- FIG. 3 shows details of the receptacle 11 in a side view.
- the receptacle 11 comprises the cup-shaped stainless steel housing 12 within which the silicone clamping mold 13 is arranged.
- the stainless steel housing 12 is rotationally symmetrical, the axis of rotation being designated by the reference number 30 in FIG.
- the inside case diameter is 180 mm and the height is 160 mm.
- the bottom 28 of the stainless steel housing 12 is provided centrally with the passage 15 with a diameter of 45 mm.
- the silicone clamping mold 13 bears against the inner walls of the stainless steel housing 12. It has a funnel-shaped opening 31 which extends coaxially with the axis of rotation 30 and which, viewed in the direction of the axis of rotation 30, is divided into three regions.
- the opening 31 has its largest diameter at 100 mm.
- the cylindrical region 32 extends over a length of 50 mm and merges into a central region which is designed in the form of an inner cone 27.
- the inner cone 27 tapers over a distance of 50 mm to an inner diameter of 60 mm in the direction of a rear, cylindrical region 29, which has a diameter of 60 mm.
- the receptacle 11 is firmly connected to the central clamping table 3 via an angle 33.
- the receptacle 11 as a whole, and in particular the silicone clamping mold 13, are designed to be radially symmetrical about the axis of rotation 30. This design contributes to a radially symmetrical distribution of the forces acting on the blank when the carrier tube is pulled out.
- the silicone clamping mold 13 consists of a silicone rubber which is produced from a two-component mixture which is commercially available under the name RTV-ME 622 (from Wacker Chemie GmbH, Kunststoff). To produce the silicone clamping mold 13, the two components are mixed in a ratio of 9: 1. The flowable mixture is poured into a casting mold, in which a casting core is arranged corresponding to the funnel-shaped opening 31 of the silicone clamping mold 13.
- the stainless steel housing 12 itself is used as a casting mold, so that the dimensional accuracy and accuracy of fit of the silicone clamping mold 13 is ensured after the polymerization.
- the porous blank 6 is produced by the known VAD method (Vapor Outside Deposition) by flame hydrolysis of a silicon-containing compound (SiCl 4 ) and deposition of SiO 2 particles on the cylindrical surface of the carrier tube 22.
- the blank 6 together with the carrier tube 22 is clamped into the device, as shown in FIGS. 1 and 2.
- the blank 6 is first inserted into the silicone clamping mold 13 of the left receptacle 11, the left, free end of the carrier tube 22 emerging from the passage 15 having a length of about 15 cm protrudes.
- the other end of the blank 6 and the right receptacle 17 is moved accordingly, the blank 6 first being aligned horizontally by shifting the right receptacle 17 by turning the handwheel 21 and then the conical blank ends between the two silicone clamping molds 13, 19 are gripped are and thus the blank 6 is stretched elastically and securely.
- the elasticity of the silicone clamping molds 13, 19 thereby ensures gentle, almost damage-free storage and fixing of the blank 6.
- a spring back of the silicone clamping mold 19 by the Compression of the silicone when clamping the blank 6 is prevented by a locking mechanism on the spindle.
- the clamping table 2 with the clamping tool 5 fastened thereon is then moved to the left, free end of the support tube 22 by the handwheel 10 being actuated accordingly.
- the collet 7 takes on the end of the support tube 22. Then, by turning the nut 8, the collet 7 is drawn into the cone of the collet receptacle 9, whereby the free end of the support tube 22 is firmly clamped.
- the clamping table 2 is moved away from the clamped blank 6 by turning the handwheel 10 until the carrier tube 22 detaches from the blank 6.
- the tapered region 26 of the blank 6 is pressed against the inner cone 27 of the silicone clamping mold 13. Due to the elasticity of the silicone clamping mold 13, damage to the blank 6 is prevented.
- This also contributes above all to the fact that the funnel-shaped inner wall of the inner cone 27 adapts to the tapering region 26 of the blank 6 by elastic deformation, thereby enclosing the entire circumference of the blank 6 in this area, and thus the compressive forces acting on the blank end 25 a larger area can be distributed.
- the arrangement of the clamping tables 2, 3 and 4 on a common linear module 1 and the alignment of the blank 6 ensures that the central axis 23 of the support tube 22 and the clamping axis 24 of the collet 7 run coaxially to one another. This ensures that when the clamping table 2 is moved, the force applied to the support tube 22 acts exactly in the direction of the central axis 23 of the support tube 22 and thus a bending stress on the blank 6 is avoided.
- a blank, transparent quartz glass tube is produced from the blank 6 thus produced by sintering at a temperature around 1500 ° C.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Making Paper Articles (AREA)
- Glass Melting And Manufacturing (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Metal Extraction Processes (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99957273A EP1047639A1 (en) | 1998-11-05 | 1999-11-02 | Method and device for removing a mandrel during the production of a quartz glass pipe |
BR9906743-9A BR9906743A (en) | 1998-11-05 | 1999-11-02 | Process and device for removing a mandrel in the production of a quartz glass tube |
KR1020007006728A KR100604684B1 (en) | 1998-11-05 | 1999-11-02 | Method and device for removing a mandrel during the production of a quartz glass pipe |
CA002317726A CA2317726A1 (en) | 1998-11-05 | 1999-11-02 | Method and device for removing a mandrel during the production of a quartz glass pipe |
JP2000580950A JP4311882B2 (en) | 1998-11-05 | 1999-11-02 | Method and apparatus for removing a mandrel during manufacture of a quartz glass tube |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19850929A DE19850929C1 (en) | 1998-11-05 | 1998-11-05 | Method and apparatus for producing quartz glass pipes |
DE19850929.4 | 1998-11-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000027764A1 true WO2000027764A1 (en) | 2000-05-18 |
Family
ID=7886743
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/008344 WO2000027764A1 (en) | 1998-11-05 | 1999-11-02 | Method and device for removing a mandrel during the production of a quartz glass pipe |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP1047639A1 (en) |
JP (1) | JP4311882B2 (en) |
KR (1) | KR100604684B1 (en) |
CN (1) | CN1287541A (en) |
BR (1) | BR9906743A (en) |
CA (1) | CA2317726A1 (en) |
DE (1) | DE19850929C1 (en) |
TW (1) | TW466217B (en) |
WO (1) | WO2000027764A1 (en) |
ZA (1) | ZA200003352B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10061319C1 (en) * | 2000-12-08 | 2002-01-24 | Heraeus Quarzglas | Holder used for a porous blank made of silicon dioxide particles has a receiver for fixing the porous blank using a fluid |
DE102011008954B4 (en) * | 2011-01-19 | 2013-01-17 | Heraeus Quarzglas Gmbh & Co. Kg | Method for producing a quartz glass cylinder and carrier for carrying out the method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4362545A (en) * | 1980-07-03 | 1982-12-07 | Corning Glass Works | Support member for an optical waveguide preform |
EP0082642A1 (en) * | 1981-12-21 | 1983-06-29 | Corning Glass Works | Method and apparatus for producing tubular glass article |
GB2172885A (en) * | 1985-03-06 | 1986-10-01 | Sumitomo Electric Industries | Method for producing a highly pure glass tube |
JPH0687618A (en) * | 1992-09-04 | 1994-03-29 | Furukawa Electric Co Ltd:The | Method for removing porous glass body from porous glass base material |
EP0701975A2 (en) * | 1994-09-15 | 1996-03-20 | Heraeus Quarzglas GmbH | Process for sintering hollow tubes of silica soot and support device therefor |
DE19751919A1 (en) * | 1996-12-02 | 1998-06-04 | Heraeus Quarzglas | Production of quartz glass bodies |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3806570A (en) * | 1972-03-30 | 1974-04-23 | Corning Glass Works | Method for producing high quality fused silica |
US4233052A (en) * | 1979-04-16 | 1980-11-11 | Corning Glass Works | Carbon coating for a starting member used in producing optical waveguides |
US4298365A (en) * | 1980-07-03 | 1981-11-03 | Corning Glass Works | Method of making a soot preform compositional profile |
-
1998
- 1998-11-05 DE DE19850929A patent/DE19850929C1/en not_active Expired - Fee Related
-
1999
- 1999-10-28 TW TW088118663A patent/TW466217B/en not_active IP Right Cessation
- 1999-11-02 JP JP2000580950A patent/JP4311882B2/en not_active Expired - Fee Related
- 1999-11-02 CA CA002317726A patent/CA2317726A1/en not_active Abandoned
- 1999-11-02 WO PCT/EP1999/008344 patent/WO2000027764A1/en active IP Right Grant
- 1999-11-02 CN CN99802009A patent/CN1287541A/en active Pending
- 1999-11-02 KR KR1020007006728A patent/KR100604684B1/en not_active IP Right Cessation
- 1999-11-02 BR BR9906743-9A patent/BR9906743A/en not_active Application Discontinuation
- 1999-11-02 EP EP99957273A patent/EP1047639A1/en not_active Withdrawn
-
2000
- 2000-07-04 ZA ZA200003352A patent/ZA200003352B/en unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4362545A (en) * | 1980-07-03 | 1982-12-07 | Corning Glass Works | Support member for an optical waveguide preform |
EP0082642A1 (en) * | 1981-12-21 | 1983-06-29 | Corning Glass Works | Method and apparatus for producing tubular glass article |
GB2172885A (en) * | 1985-03-06 | 1986-10-01 | Sumitomo Electric Industries | Method for producing a highly pure glass tube |
JPH0687618A (en) * | 1992-09-04 | 1994-03-29 | Furukawa Electric Co Ltd:The | Method for removing porous glass body from porous glass base material |
EP0701975A2 (en) * | 1994-09-15 | 1996-03-20 | Heraeus Quarzglas GmbH | Process for sintering hollow tubes of silica soot and support device therefor |
DE19751919A1 (en) * | 1996-12-02 | 1998-06-04 | Heraeus Quarzglas | Production of quartz glass bodies |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 18, no. 347 30 June 1994 (1994-06-30) * |
Also Published As
Publication number | Publication date |
---|---|
JP2002529353A (en) | 2002-09-10 |
EP1047639A1 (en) | 2000-11-02 |
KR20010033286A (en) | 2001-04-25 |
BR9906743A (en) | 2000-10-17 |
CA2317726A1 (en) | 2000-05-18 |
CN1287541A (en) | 2001-03-14 |
TW466217B (en) | 2001-12-01 |
KR100604684B1 (en) | 2006-07-26 |
ZA200003352B (en) | 2001-02-20 |
JP4311882B2 (en) | 2009-08-12 |
DE19850929C1 (en) | 1999-11-25 |
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