WO1997029868A1 - Verfahren und vorrichtung zum herstellen einer halterung an einem blechformteil aus dünnem blech - Google Patents
Verfahren und vorrichtung zum herstellen einer halterung an einem blechformteil aus dünnem blech Download PDFInfo
- Publication number
- WO1997029868A1 WO1997029868A1 PCT/EP1997/000759 EP9700759W WO9729868A1 WO 1997029868 A1 WO1997029868 A1 WO 1997029868A1 EP 9700759 W EP9700759 W EP 9700759W WO 9729868 A1 WO9729868 A1 WO 9729868A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- die
- sheet metal
- metal part
- pressure
- gas
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
- B21D51/44—Making closures, e.g. caps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/049—Deforming bodies having a closed end
Definitions
- the invention relates to a method for producing a holder on a sheet metal part made of thin sheet metal, in which the sheet metal part is provided with a cup-shaped shape, and a device for carrying out the method.
- the object of the invention is therefore to produce a holder in a cost-effective manner even with thin sheets.
- this object is achieved in that the molding is brought into engagement with a die and the side of the molding opposite the die is subjected to pressure.
- the shape which can also be called the "dome" is thus introduced into the die.
- the inside of the die has the negative shape of the shape later desired on the outside of the dome. If pressure is now applied to the inside of the dome, the dome expands. Its outside is then pressed against the die under pressure. Since it is only a thin sheet, the outside of the dome assumes the desired shape because it fits tightly against the corresponding negative shape of the die.
- the dome is thus reshaped, which ultimately leads to the desired outer contour without the material being weakened. More generally, this outer contour then forms the desired fastening contour or the fastening profile, to which attachments can be securely fastened.
- the die must be designed differently. Instead of an inner contour, it then carries an outer contour and is inserted into the interior of the dome. The pressure is then applied from the outside of the dome to form the fastening profile or the fastening contour. With the new process, the desired Apply contours or profiles on both sides of the sheet metal part. The pressure only ever has to be applied from the side on which the die is not in contact. There are no impurities, ie the shaped sheet metal part can be handled or processed immediately after the shaping without having to be cleaned.
- a closed space is preferably created, the boundary walls of which comprise the parts of the formation which are adjacent to a forming section of the die, and the space is filled with a pressurized fluid, in particular gas.
- the space is preferably small and the gas supply occurs suddenly. If the space is small, you need little gas. This allows the
- the pressure can be generated by compressing an elastomer spring, which then presses the sheet into the die. You don't need any consumables, such as gas, and you can work relatively quickly. If one compresses an elastomer spring in one direction, then it expands in another direction, namely wherever there is room for expansion. This makes it possible to "deflect" the force introduced into the elastomer spring, so that the sheet metal part is pressed into the die under the action of the elastomer spring compressed in one direction and thereby expanded in another direction.
- a force is preferably allowed to act on the elastomer spring perpendicular to the direction of deformation. If the deformation is to take place in the radial direction on the mandrel, the elastomer spring is compressed axially. As a result, it expands radially. Because the compression occurs essentially perpendicular to the expansion of the compression spring, a very uniform distribution of force on the sheet metal part can be achieved, so that the sheet thickness remains largely uniform even after the forming.
- the pressure is maintained over a predetermined period of time. This ensures that the embossed shape is retained after releasing the pressure.
- the die is preferably held in an upper part and the sheet metal part in a lower part, which are locked together before the pressure is applied.
- the terms “upper part” and “lower part” are not intended to mean any restriction to any orientation in space. They are chosen only to distinguish the two parts, the one part the die and the other part hold the sheet metal part. By locking these two parts, the forces occurring when the sheet metal part is pressurized can be absorbed.
- the locking can take place, for example, by means of a mechanism which, when the upper part and lower part are in a working position, comprises both parts. Moving the two parts apart is only possible if the corresponding mechanism, for example a clamp or the like, is opened or removed.
- the die preferably has a negative form of a thread, the sheet metal part is held in the bottom part in a rotationally fixed manner and the die and the bottom part are rotated relative to one another after the pressure has been reduced.
- a thread is a preferred fastening contour on the outside of the formation or of the dome, because it is then relatively easy to connect add-on parts to the sheet metal part.
- the attachments only have to be screwed onto the sheet metal part, for example the cover of a gas cartridge. For safety reasons, at least 4.5 load-bearing threads are generally prescribed here.
- At least one, in particular a ring, can run on the die
- Protrusion extended before pressurization and retracted after pressurization for example, grooves can be embossed, which can then also be used on the dome to hold attachments. These attachments can then snap into the groove or grooves, for example. It is necessary that the projections be extended or retracted. However, an undivided die is otherwise sufficient, so that the outside or the inside of the dome remain smooth.
- the die preferably lies on the outside of the formation. Accordingly, the die has an internal thread or an inwardly projecting or extendable projection, so that the corresponding contour results on the outside of the formation or of the dome. For many applications, this is the desired location for attaching attachments.
- the object is also achieved by a device for carrying out the method, in which an upper part has a die, a lower part has a workpiece holder and a pressure generating device and the upper part and the lower part can be moved towards one another.
- the pressure generating device can, for example, have a gas connection and a sealing arrangement.
- the upper part and the lower part can advantageously be locked together in one working position. In this way, the forces which are applied by the gas pressures can be absorbed.
- the upper part and lower part and thus also the sheet metal part and the die remain in a predetermined position, so that the deformation is not disturbed by movements.
- the gas connection in the working position preferably protrudes into the die with a pipe end.
- the gas connection therefore fills a part of the interior of the die, so that the space to be filled with gas later remains small.
- the tube end thus acts as a displacement body.
- the sealing arrangement surrounds the pipe end in a ring. With this simple measure, a seal can be ensured all around.
- the upper part also has a sealing arrangement which acts on the side of the sheet metal part which comes into engagement with the die.
- the sheet metal part has through openings which, for example in a gas cartridge, later serve to remove the gas from the cartridge.
- the gas pressure can then pass through the sheet metal part.
- the sealing arrangement on the top prevents the gas from entering the area with its pressure. before penetrates, which should actually be reshaped. Rather, the sealing arrangement keeps the die free of gas.
- an elastomer spring is provided on the side of the sheet metal part opposite the die and a pressure tappet cooperating with the elastomer spring.
- the pressure ram compresses the elastomer spring in one direction. As a result, it expands in a different direction and thereby presses the sheet metal part into the die.
- the "commutes" are relatively short, i.e. the change in shape of the elastomer spring is kept within relatively narrow limits.
- the pressure ram has a direction of movement parallel to the surface of the die.
- the pressure ram thus compresses the elastomer spring in a direction perpendicular to the forming direction. If, for example, the deformation is to take place on the circumferential wall of the dome, that is to say on the radial outer wall, then the pressure ram moves in the axial direction. This causes the elastomer spring to expand radially and press the sheet metal part into the die.
- the elastomer spring is preferably formed from polyurethane. This material can withstand a large number of load cycles, ie a large number of forming operations, without being damaged.
- the upper part advantageously has a rotary drive.
- a rotary drive of this type a rotational movement can be superimposed in addition to the linear movement apart when the upper part and lower part move apart.
- Sheet metal parts from the die are often more gentle. This is particularly advantageous if the workpiece holder has an anti-rotation device for the sheet metal part.
- the die can be rotated relative to the workpiece because the workpiece is held in the lower part in a rotationally fixed manner.
- the die preferably has a negative form of a thread.
- a thread is embossed on the outside of the dome. Since the die can now be rotated relative to the lower part and the workpiece, that is to say the sheet metal part, is held in the lower part, the sheet metal part and the die can be separated from one another without any problems.
- the die has at least one extendable and retractable projection.
- Fig. 3 is a plan view of the extendable and retractable projection according to Fig. 2 and
- Fig. 1 shows a device 1 for producing a holder on a sheet metal part 2 made of thin sheet metal.
- the sheet has a thickness in the range of 0.25 to 0.35 mm.
- the sheet metal molded part 2 is the cover of a gas cartridge, which is formed by deep drawing.
- the sheet metal part 2 has a peripheral wall 3 with a flange collar 4.
- the peripheral wall 3 is essentially perpendicular to a base 5.
- a dome 6 In the center of the base 5 there is a dome 6, that is to say a cup-shaped configuration which is designed as a hollow cylinder.
- the side walls of the dome 6 run essentially parallel to the peripheral wall 3 of the sheet metal part 2.
- the side of the sheet metal part from which the dome 6 rises is referred to below as the outside, while the other side is referred to as the inside.
- the device 1 has a lower part 7.
- the lower part 7 has a workpiece holder 8, in which the sheet metal part 2 is inserted.
- the lower part 7 also has a gas connection 9, which is connected via a line 10 to a gas source 11, from which gas can be supplied under pressure under control.
- the control can be limited to providing gas with the necessary pressure or releasing the gas from the gas connection 9.
- the gas connection 9 opens into the workpiece holder 8 via a pipe end 12.
- the pipe end 12 protrudes from the workpiece holder 8 by a certain distance.
- the pipe end 12 is surrounded by a seal 13.
- a schematically illustrated anti-rotation device 14 is provided, which can be actuated, for example, via a drive 15.
- the drive 15 When the drive 15 is actuated, it presses a lever tip 16 of the anti-rotation device 14 against the sheet metal part 2 and holds it in place by friction against rotation and against being pulled out of the workpiece holder 8.
- a plurality of anti-rotation locks 14, for example three pieces, are provided evenly distributed in the circumferential direction in order to achieve a uniform loading of the sheet metal part 2.
- the device 1 also has an upper part 17 which carries a die 19 provided with an internal thread 18.
- the die 19 is ground, for example, to produce the inner thread 18.
- the upper part 17 has a sealing arrangement 20, which acts on the bottom 5 of the sheet metal part 2, specifically on the outside thereof.
- a further seal arrangement 21 is provided on the upper part 17, which on the
- Front side acts on the outside of the dome 6.
- the dome 6 is provided with a through opening 22.
- the sealing arrangement 21 surrounds the opening 22.
- Fig. 1 shows the device 1 in the working position, in which the upper part 17 and lower part 7 have been moved towards each other so far that the sheet metal part 2 is pressed by the seal arrangements 20, 21 against the seal 13 in the lower part 7. As a result, a space 22 is formed which is closed. Only under the gas connection 9 can gas be supplied under pressure or the gas be released.
- the dome 6 is inflated.
- the outside of its peripheral wall is pressed into the internal thread 18 of the die 19.
- a thread forms on the outside of the dome 6. This results in threads that can have a greater depth than the thickness of the sheet metal of the molded sheet part 2.
- the pressure is suddenly introduced into the space 22. This creates a practically explosion-like reshaping.
- the pressure is then maintained for a predetermined time so that the reshaping is not reversed by elastic phenomena.
- a locking device 23 which has, for example, a plurality of clamps 24 distributed uniformly in the circumferential direction, one of which is shown.
- the bracket 24 is rotatably attached to the lower part 7. In the working position, it engages around a circumferential projection 25 on the upper part 17.
- the clamp 24 can be actuated by a drive 26.
- the gas is discharged from the space 22 via the gas connection 9 and the clamp 24 of the locking device 23 is released.
- the rotation 14 remains effective, however, so that the sheet metal part 2 is held in the workpiece holder 8 in a rotationally fixed manner.
- the sheet metal part 2 is now in threaded engagement with the die 19.
- the upper part 17 is now simultaneously rotated and raised, which is indicated by the arrows 27, 28.
- a corresponding rotary drive for the upper part 17, which can simultaneously cause a translatory movement, is for reasons of clarity not shown, but available. Since the sheet metal part 2 is held in the lower part 7 in a rotationally fixed manner and the lower part 7 does not rotate, the die 19 is thereby screwed out of the sheet metal part 2. As soon as the die 19 comes free from the sheet metal part 2, the rotation can stop and the translational movement can be continued on its own. Then the anti-rotation 14 is released and the sheet metal part 2 can be removed from the lower part. If necessary, ejectors not shown here can be provided.
- the sheet metal part 2 is inserted into the workpiece holder 8.
- the upper part 17 is now lowered in the direction of arrow 29 until the sheet metal part 2 between the
- a die 18 ' the schematic structure of which is shown in FIG. 2.
- the die 18 ' here has a retractable and extendable projection 30 which is actuated by a ram 31 with an inclined surface 32.
- This projection is shown in plan view in FIG. 3. It can be seen that the projection, when it has been driven out of the die 18 'by the plunger 31, forms a closed ring. If the reshaping takes place, the dome will lay against the die everywhere. Its expansion is prevented only in the area of the projection 30, so that a groove is formed there. This groove may not be completely smooth because the projection 30 is divided several times in the circumferential direction.
- FIGS. 2 and 3 are only schematic. Reset elements are not shown. There are also no arrows that ensure the stability of the die.
- the projection 30 is moved outward again, so that the interior of the die is free.
- FIG. 4 shows another device 110 for producing a holder on a sheet metal part 2 made of thin sheet metal. This corresponds in substantial parts to the illustration in FIG. 1. The same parts are therefore provided with the same reference numerals.
- the shaping of the sheet metal part 2 in the device 110 is, however, not by a gas supply, but by an elastomer spring 122 which is arranged in the interior of the dome 6 when the sheet metal part 2 is inserted into the device 110.
- the elastomer spring 122 consists for example of polyurethane.
- a pressure plunger 112 can be moved in the direction of arrow 133 in order to compress the elastomer spring 122.
- the direction 133 runs axially.
- the dome 6 is to be shaped radially. If one now compresses the elastomer spring 122 with the aid of the pressure plunger 112, that is to say compresses it, then it expands radially because the volume the elastomer spring 122 must remain essentially constant. With this radial expansion, the dome 6, more precisely, its peripheral wall, is then pressed into the die 18.
- the upper part 17 it is not absolutely necessary for the upper part 17 to be provided with sealing arrangements 20, 21. However, these can still be present.
- the seal 13 in the lower part is no longer required for sealing against gas passage. However, since the seals 13, 20, 21 also have a certain elasticity or softness, they can be used to ensure that the sheet metal part 2 is held gently in the device 110.
- the rest of the procedure is the same as described in connection with FIG. 1.
- the sheet metal part 2 is inserted into the lower part 7, which is locked with the upper part 17.
- the plunger 112 is then moved in the direction of the arrow 133 in order to compress the elastomer spring 122.
- the pressure tappet 112 can be relieved again.
- the deformation of the dome caused by the radial expansion of the compressed compression spring 122 is retained.
- the die 19 and the sheet metal part 2 are rotated relative to one another and thereby detached from one another.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97903314A EP0883453A1 (de) | 1996-02-19 | 1997-02-18 | Verfahren und vorrichtung zum herstellen einer halterung an einem blechformteil aus dünnem blech |
JP9529012A JP2000504629A (ja) | 1996-02-19 | 1997-02-18 | 薄板からなる板加工品に取付部を製造する方法及び装置 |
AU17915/97A AU1791597A (en) | 1996-02-19 | 1997-02-18 | Method and device for producing a mounting on a thin sheet metal shaped part |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996106055 DE19606055A1 (de) | 1996-02-19 | 1996-02-19 | Verfahren und Vorrichtung zum Herstellen einer Halterung an einem Blechformteil aus dünnem Blech |
DE19606055.9 | 1996-02-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997029868A1 true WO1997029868A1 (de) | 1997-08-21 |
Family
ID=7785778
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/000759 WO1997029868A1 (de) | 1996-02-19 | 1997-02-18 | Verfahren und vorrichtung zum herstellen einer halterung an einem blechformteil aus dünnem blech |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0883453A1 (de) |
JP (1) | JP2000504629A (de) |
AU (1) | AU1791597A (de) |
CA (1) | CA2246681A1 (de) |
DE (1) | DE19606055A1 (de) |
WO (1) | WO1997029868A1 (de) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE172442C (de) * | ||||
US2271762A (en) * | 1938-12-16 | 1942-02-03 | Draper Mfg Co | Method of making bung openings |
US2455767A (en) * | 1944-08-11 | 1948-12-07 | Continental Can Co | Sput connection |
DE2702890A1 (de) * | 1977-01-25 | 1978-07-27 | Vyzk Ustav Tvarecich Stroju | Vorrichtung zum aufweiten von hohlkoerpern, insbesondere von blechbehaeltern |
DE2735505A1 (de) * | 1977-08-06 | 1979-02-08 | Krupp Gmbh | Verfahren und vorrichtung zur herstellung eines hinterschnittenen hohlkoerpers |
EP0521637A1 (de) * | 1991-07-04 | 1993-01-07 | CarnaudMetalbox plc | Vorrichtung und Verfahren zum Wieder-im-Form-bringen von Behältern |
WO1993012982A1 (en) * | 1991-12-26 | 1993-07-08 | Precision Valve Corporation | A dimpled gasket |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1436538A (en) * | 1972-11-17 | 1976-05-19 | Dale Ltd John | Manufacture of articles such as collapsible tubes |
DE2302804C3 (de) * | 1973-01-20 | 1979-07-19 | Tokyu Sharyo Seizo K.K., Yokohama, Kanagawa (Japan) | Vorrichtung zum Ausbauchen und Lochstanzen napfförmiger Rohlinge in einem Gesenk |
-
1996
- 1996-02-19 DE DE1996106055 patent/DE19606055A1/de not_active Withdrawn
-
1997
- 1997-02-18 JP JP9529012A patent/JP2000504629A/ja active Pending
- 1997-02-18 AU AU17915/97A patent/AU1791597A/en not_active Abandoned
- 1997-02-18 CA CA 2246681 patent/CA2246681A1/en not_active Abandoned
- 1997-02-18 EP EP97903314A patent/EP0883453A1/de not_active Withdrawn
- 1997-02-18 WO PCT/EP1997/000759 patent/WO1997029868A1/de not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE172442C (de) * | ||||
US2271762A (en) * | 1938-12-16 | 1942-02-03 | Draper Mfg Co | Method of making bung openings |
US2455767A (en) * | 1944-08-11 | 1948-12-07 | Continental Can Co | Sput connection |
DE2702890A1 (de) * | 1977-01-25 | 1978-07-27 | Vyzk Ustav Tvarecich Stroju | Vorrichtung zum aufweiten von hohlkoerpern, insbesondere von blechbehaeltern |
DE2735505A1 (de) * | 1977-08-06 | 1979-02-08 | Krupp Gmbh | Verfahren und vorrichtung zur herstellung eines hinterschnittenen hohlkoerpers |
EP0521637A1 (de) * | 1991-07-04 | 1993-01-07 | CarnaudMetalbox plc | Vorrichtung und Verfahren zum Wieder-im-Form-bringen von Behältern |
WO1993012982A1 (en) * | 1991-12-26 | 1993-07-08 | Precision Valve Corporation | A dimpled gasket |
Also Published As
Publication number | Publication date |
---|---|
CA2246681A1 (en) | 1997-08-21 |
DE19606055A1 (de) | 1997-08-28 |
JP2000504629A (ja) | 2000-04-18 |
EP0883453A1 (de) | 1998-12-16 |
AU1791597A (en) | 1997-09-02 |
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