CA2260634C - Elastomeric stator for an eccentric spiral pump - Google Patents
Elastomeric stator for an eccentric spiral pump Download PDFInfo
- Publication number
- CA2260634C CA2260634C CA002260634A CA2260634A CA2260634C CA 2260634 C CA2260634 C CA 2260634C CA 002260634 A CA002260634 A CA 002260634A CA 2260634 A CA2260634 A CA 2260634A CA 2260634 C CA2260634 C CA 2260634C
- Authority
- CA
- Canada
- Prior art keywords
- stator
- casing
- attachment ring
- stator according
- lining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
- F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
- F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits
- F04C2/1075—Construction of the stationary member
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
An elastomeric stator for an eccentric spiral pump is provided. The stator has a lining made of elastomeric material and a hollow chamber for a rotor. The hollow chamber has a double or multiple spiral configuration. A rigid casing surrounds the lining and is spiraled in conformity with the inner contour of the stator. The casing has a practically uniform thickness over its length. Attachment rings are secured to ends of the casing and serve for joining the stator to other pump parts. The inner peripheral surface of the attachment ring has a contour that corresponds at least substantially to the inner contour of the stator.
Description
Background of the Invention The present invention relates to an elastomeric stator for an eccentric spiral pump, with the elastomeric stator having a rigid casing that surrounds a lining that is made of elastomeric material and has a hollow chamber that serves for accommodating a rotor, with the hollow chamber having a double or multiple spiral configuration; attachment rings are disposed at the ends of the stator for joining with other parts of the eccentric spiral pump.
With the known stators of this type, the attachment rings are embodied in a flange-like manner as circular rings to provide favorable fastening possibilities to the adjoining parts of the eccentric spiral pump, for example on the pump jack. The use of these circular rings for stators whose casing has a uniform thickness over its length, and therefore has a spiral configuration on the outside and on the inside, is not possible since such circular rings do not allow an orderly connection of the stator to the remaining parts of the pump to occur. For this reason, one is forced to permanently deform the ends of the casing of this last-mentioned stator in order to impart a cylindrical shape to it at that location. It is to be understood that this deformation results in special processing steps.
It is therefore and object of the present invention to embody stators of the aforementioned general type in such a way that on the one hand they provide the advantages of a casing that is spiraled on the inside and on the outside, and on the other hand are also suitable for such pumps that require a circular connection at the stator ends.
In one aspect, this invention provides an elastomeric stator for an eccentric spiral pump, comprising:
a lining made of elastomeric material and having a hollow chamber that serves for accommodating a rotor, said hollow chamber having a double or multiple spiral configuration; a rigid casing that surrounds said lining, wherein said casing is spiraled in conformity with an inner contour of said stator, and wherein said casing has a practically uniform thickness over its length; and a respective attachment ring secured to at least one end of said casing and serving for joining of said stator with other pump parts, wherein an inner peripheral surface of said attachment ring has a contour that corresponds at least substantially to said inner contour of said stator.
Brief Description of the Drawing This object, and other objects and advantages of the present invention, will appear more clearly from the following specification in conjunction with the accompanying schematic drawing, in which:
Fig. 1 is a longitudinal cross-sectional view of an end portion of one exemplary embodiment of the inventive elastomeric stator;
Fig. 2 is a view of the stator of Fig. 1 taken in the direction of the arrow II thereof;
With the known stators of this type, the attachment rings are embodied in a flange-like manner as circular rings to provide favorable fastening possibilities to the adjoining parts of the eccentric spiral pump, for example on the pump jack. The use of these circular rings for stators whose casing has a uniform thickness over its length, and therefore has a spiral configuration on the outside and on the inside, is not possible since such circular rings do not allow an orderly connection of the stator to the remaining parts of the pump to occur. For this reason, one is forced to permanently deform the ends of the casing of this last-mentioned stator in order to impart a cylindrical shape to it at that location. It is to be understood that this deformation results in special processing steps.
It is therefore and object of the present invention to embody stators of the aforementioned general type in such a way that on the one hand they provide the advantages of a casing that is spiraled on the inside and on the outside, and on the other hand are also suitable for such pumps that require a circular connection at the stator ends.
In one aspect, this invention provides an elastomeric stator for an eccentric spiral pump, comprising:
a lining made of elastomeric material and having a hollow chamber that serves for accommodating a rotor, said hollow chamber having a double or multiple spiral configuration; a rigid casing that surrounds said lining, wherein said casing is spiraled in conformity with an inner contour of said stator, and wherein said casing has a practically uniform thickness over its length; and a respective attachment ring secured to at least one end of said casing and serving for joining of said stator with other pump parts, wherein an inner peripheral surface of said attachment ring has a contour that corresponds at least substantially to said inner contour of said stator.
Brief Description of the Drawing This object, and other objects and advantages of the present invention, will appear more clearly from the following specification in conjunction with the accompanying schematic drawing, in which:
Fig. 1 is a longitudinal cross-sectional view of an end portion of one exemplary embodiment of the inventive elastomeric stator;
Fig. 2 is a view of the stator of Fig. 1 taken in the direction of the arrow II thereof;
Fig. 3 is a longitudinal cross-sectional view of an end portion of a modified exemplary embodiment of the inventive elastomeric stator together with a connecting element.
- 2a -Summary of the Invention The elastomeric stator of the present invention is characterized primarily in that the separate attachment rings are secured to the ends of a casing that is spiraled in conformity with the inner contour of the stator and has a practically uniform thickness over the length of the casing, whereby the inner edge of the attachment rings has a contour that corresponds at least substantially to the inner contour of the stator.
The present invention thus proceeds from a stator casing that has a uniform thickness over its periphery and its length and accordingly can be easily manufactured from a cylindrical tubular member by deformation from the inside. A processing or mechanical treatment of the end sections of such a casing configuration is not required; rather, these end sections can be formed in conformity with the spirals and accordingly have approximately the shape of an ellipse when viewing their end faces . In order to provide a general use for such casings, they are provided with flange-like attachment rings that deviate from the geometrical circular ring shape and instead their inner periphery, i.e.
the inwardly disposed edge thereof, has an at least approximately elliptical shape in conformity with the inner contour of the elastic lining. For this reason, the end face of the stator casing can also rest flush against the inner side of the attachment and can be fastened there, which is preferably achieved by means of welding or the like.
The thus-embodied stator can be utilized universally. It can therefore also be used with those eccentric spiral pumps that for the conventional stators must be provided with cylindrical outer surfaces.
Pursuant to a further proposal of the present invention, the inventive stator offers the possibility of being able to manufacture stator casing bodies in greater lengths, and in particular even with inwardly disposed elastic linings, in order from these bodies of greater lengths to be able to cut off shorter ends with a standard cut. These ends are then directly used as casing bodies and in the sense of the present invention are provided with the attachment rings. Workpieces produced in the aforementioned manner and already provided with an elastic inner lining can even be fixedly connected to the attachment rings by weld seams on their backs.
Further specific features of the present invention will be described in detail subsequently.
- 2a -Summary of the Invention The elastomeric stator of the present invention is characterized primarily in that the separate attachment rings are secured to the ends of a casing that is spiraled in conformity with the inner contour of the stator and has a practically uniform thickness over the length of the casing, whereby the inner edge of the attachment rings has a contour that corresponds at least substantially to the inner contour of the stator.
The present invention thus proceeds from a stator casing that has a uniform thickness over its periphery and its length and accordingly can be easily manufactured from a cylindrical tubular member by deformation from the inside. A processing or mechanical treatment of the end sections of such a casing configuration is not required; rather, these end sections can be formed in conformity with the spirals and accordingly have approximately the shape of an ellipse when viewing their end faces . In order to provide a general use for such casings, they are provided with flange-like attachment rings that deviate from the geometrical circular ring shape and instead their inner periphery, i.e.
the inwardly disposed edge thereof, has an at least approximately elliptical shape in conformity with the inner contour of the elastic lining. For this reason, the end face of the stator casing can also rest flush against the inner side of the attachment and can be fastened there, which is preferably achieved by means of welding or the like.
The thus-embodied stator can be utilized universally. It can therefore also be used with those eccentric spiral pumps that for the conventional stators must be provided with cylindrical outer surfaces.
Pursuant to a further proposal of the present invention, the inventive stator offers the possibility of being able to manufacture stator casing bodies in greater lengths, and in particular even with inwardly disposed elastic linings, in order from these bodies of greater lengths to be able to cut off shorter ends with a standard cut. These ends are then directly used as casing bodies and in the sense of the present invention are provided with the attachment rings. Workpieces produced in the aforementioned manner and already provided with an elastic inner lining can even be fixedly connected to the attachment rings by weld seams on their backs.
Further specific features of the present invention will be described in detail subsequently.
Description of Preferred Embodiments Referring now to the drawing in detail, the elastomeric stator essentially comprises a rigid, for example steel, shell or casing 1, an inwardly disposed lining 2 that is surrounded by the casing 1 and is made of rubber or rubber-like polymeric material, and connection or attachment rings 7 that are disposed at the ends of the stator and are also made of steel.
The lining 2 is preferably fixedly connected to the casing 1;
however, it can also merely rest against the inner side of the casing 1, thus dispensing with a binder, and is therefore held only in a positively engaging or interlocking manner. The lining 2 has a continuous hollow chamber 4 for receiving a rotor 5, which is illustrated in cross-section only in Fig. 2. To achieve a pump effect, the rotor 5 has the shape of a single spiral whereas the hollow chamber 2 has the shape of a double spiral.
The important thing is that the lining 2 on the whole has a uniform thickness "S", and the inside and outside of the casing 1 has a contour that is also spiraled in conformity with the hollow chamber 4. The casing 1 therefore also has a uniform thickness M
over the length of the stator.
Disposed at the end face 6 of the casing 1 is an attachment ring 7 that is made of steel or the like and is intended for establishing the connection between the stator on the one hand and the pump jack at the intake or pressure side on the other hand.
The outer periphery of the attachment ring 7 is cylindrical.
However, the inwardly disposed edge 8 of the attachment ring 7 extends in the manner of the contour of the hollow chamber 4, i.e., parallel thereto, and hence essentially describes an ellipse (see Fig. 2). The lining 2 extends radially inwardly of the edge 8.
An annular groove 9 is disposed on the outer end face of the attachment ring 7 and extends concentric to the outer peripheral surface thereof; the annular groove 9 serves to receive an 0-ring 10.
The illustrated stator is preferably held between two flange-like parts of the pump that are connected by through bolts; the outer diameter of these parts should in this connection correspond to that of the attachment rings 7 provided at both ends, whereby the 0-ring 10 is deformed and establishes a seal. It is also possible to provide the attachment ring 7, in the vicinity of its outer periphery, with bolt holes or similar connecting means in order to provide a connection to other parts of the pump that is as detachable as possible.
The casing 1, already equipped with the lining 2, can be produced by being cut to length from an article of greater length by being sawed off therefrom or by any other suitable means. Both ends of this casing 1 can then be provided with an attachment ring 7 that is secured by weld joints applied to the outside in order in this manner to provide a sealed and secure connection between the casing 1 and the two attachment rings 7.
For reasons of fluid flow, the inner periphery of the attachment ring 7, as indicated at the reference numeral 11, can expand conically outwardly.
In the embodiment illustrated in Fig. 3, an attachment ring 7 is again provided at one but preferably also at both ends of the stator. However, in contrast to the embodiment illustrated in Figs.
1 and 2, in this embodiment the outer diameter of the attachment ring 7 corresponds to the greatest amplitude of the casing 1, in other words, does not extend beyond the casing 1 in a radial direction. In addition, the inner, approximately elliptical peripheral surface 13 of the attachment ring 7 is flush with the inner surface 4' of the lining 2. Thus, there is no break or shoulder at the transition between the attachment ring 7 and the inner surface 4' of the lining 2. The weld joint or seam 12 is again provided.
In Fig. 3, the attachment ring 7 serves for the fastening of the metallic sleeve 14 that is coaxial with the stator and that is connected at its rear end to the attachment ring 7 via a weld seam 15, while being provided in the region of its front end with an internal and possibiy also an external screw thread 16. This connecting thread can also have a conical shape. The metallic sleeve 14 additionally has an outer diameter that corresponds with that of the attachment ring 7, and an inner diameter that is determined by the greatest transverse dimension of the peripheral surface 13.
Stators of the type shown in Fig. 3 are predominantly used for being lowered into test bores, for example for the extraction of crude oil. Such stators have the advantage that at one end of the stator the suction armatures can be fastened whiie at the other end of the stator the pipes that accommodate the drive rods can be secured. However, the present invention is not limited to this application.
The subsequent attachment of a metallic sleeve 14 having threads has the advantage that the threads can be cut into an element that is later to be connected to the stator.
Also with the embodiment illustrated in Fig. 2 the attachment ring 7 effects a favorable transition from the outwardly spiraled .
stator casing I to an outer cylindrical connection member.
The present invention is, of course, in no way restricted to the specific disclosure of the specification and drawing, but also encompasses any modifications within the scope of the appended claims.
The lining 2 is preferably fixedly connected to the casing 1;
however, it can also merely rest against the inner side of the casing 1, thus dispensing with a binder, and is therefore held only in a positively engaging or interlocking manner. The lining 2 has a continuous hollow chamber 4 for receiving a rotor 5, which is illustrated in cross-section only in Fig. 2. To achieve a pump effect, the rotor 5 has the shape of a single spiral whereas the hollow chamber 2 has the shape of a double spiral.
The important thing is that the lining 2 on the whole has a uniform thickness "S", and the inside and outside of the casing 1 has a contour that is also spiraled in conformity with the hollow chamber 4. The casing 1 therefore also has a uniform thickness M
over the length of the stator.
Disposed at the end face 6 of the casing 1 is an attachment ring 7 that is made of steel or the like and is intended for establishing the connection between the stator on the one hand and the pump jack at the intake or pressure side on the other hand.
The outer periphery of the attachment ring 7 is cylindrical.
However, the inwardly disposed edge 8 of the attachment ring 7 extends in the manner of the contour of the hollow chamber 4, i.e., parallel thereto, and hence essentially describes an ellipse (see Fig. 2). The lining 2 extends radially inwardly of the edge 8.
An annular groove 9 is disposed on the outer end face of the attachment ring 7 and extends concentric to the outer peripheral surface thereof; the annular groove 9 serves to receive an 0-ring 10.
The illustrated stator is preferably held between two flange-like parts of the pump that are connected by through bolts; the outer diameter of these parts should in this connection correspond to that of the attachment rings 7 provided at both ends, whereby the 0-ring 10 is deformed and establishes a seal. It is also possible to provide the attachment ring 7, in the vicinity of its outer periphery, with bolt holes or similar connecting means in order to provide a connection to other parts of the pump that is as detachable as possible.
The casing 1, already equipped with the lining 2, can be produced by being cut to length from an article of greater length by being sawed off therefrom or by any other suitable means. Both ends of this casing 1 can then be provided with an attachment ring 7 that is secured by weld joints applied to the outside in order in this manner to provide a sealed and secure connection between the casing 1 and the two attachment rings 7.
For reasons of fluid flow, the inner periphery of the attachment ring 7, as indicated at the reference numeral 11, can expand conically outwardly.
In the embodiment illustrated in Fig. 3, an attachment ring 7 is again provided at one but preferably also at both ends of the stator. However, in contrast to the embodiment illustrated in Figs.
1 and 2, in this embodiment the outer diameter of the attachment ring 7 corresponds to the greatest amplitude of the casing 1, in other words, does not extend beyond the casing 1 in a radial direction. In addition, the inner, approximately elliptical peripheral surface 13 of the attachment ring 7 is flush with the inner surface 4' of the lining 2. Thus, there is no break or shoulder at the transition between the attachment ring 7 and the inner surface 4' of the lining 2. The weld joint or seam 12 is again provided.
In Fig. 3, the attachment ring 7 serves for the fastening of the metallic sleeve 14 that is coaxial with the stator and that is connected at its rear end to the attachment ring 7 via a weld seam 15, while being provided in the region of its front end with an internal and possibiy also an external screw thread 16. This connecting thread can also have a conical shape. The metallic sleeve 14 additionally has an outer diameter that corresponds with that of the attachment ring 7, and an inner diameter that is determined by the greatest transverse dimension of the peripheral surface 13.
Stators of the type shown in Fig. 3 are predominantly used for being lowered into test bores, for example for the extraction of crude oil. Such stators have the advantage that at one end of the stator the suction armatures can be fastened whiie at the other end of the stator the pipes that accommodate the drive rods can be secured. However, the present invention is not limited to this application.
The subsequent attachment of a metallic sleeve 14 having threads has the advantage that the threads can be cut into an element that is later to be connected to the stator.
Also with the embodiment illustrated in Fig. 2 the attachment ring 7 effects a favorable transition from the outwardly spiraled .
stator casing I to an outer cylindrical connection member.
The present invention is, of course, in no way restricted to the specific disclosure of the specification and drawing, but also encompasses any modifications within the scope of the appended claims.
Claims (14)
1. ~An elastomeric stator for an eccentric spiral pump, comprising:
a lining made of elastomeric material and having a hollow chamber that serves for accommodating a rotor, said hollow chamber having a double or multiple spiral configuration;
a rigid casing that surrounds said lining, wherein said casing is spiraled in conformity with an inner contour of said stator, and wherein said casing has a practically uniform thickness over its length; and a respective attachment ring secured to at least one end of said casing and serving for joining of said stator with other pump parts, wherein an inner peripheral surface of said attachment ring has a contour that corresponds at least substantially to said inner contour of said stator.
a lining made of elastomeric material and having a hollow chamber that serves for accommodating a rotor, said hollow chamber having a double or multiple spiral configuration;
a rigid casing that surrounds said lining, wherein said casing is spiraled in conformity with an inner contour of said stator, and wherein said casing has a practically uniform thickness over its length; and a respective attachment ring secured to at least one end of said casing and serving for joining of said stator with other pump parts, wherein an inner peripheral surface of said attachment ring has a contour that corresponds at least substantially to said inner contour of said stator.
2. ~A stator according to claim 1, wherein a respective attachment ring is secured to each end of said casing.
3. ~A stator according to claim 1, wherein said attachment ring has an outer periphery that is at least approximately circular in shape.
4. ~A stator according to claim 1, wherein said attachment ring has an outer end face that is provided with at least one annular groove for receiving a sealing ring.
5. ~A stator according to claim 1, wherein said inner peripheral surface of said attachment ring extends essentially parallel to said inner contour of said stator.
6. ~A method of manufacturing said elastomeric stator of claim 1, which includes the step of cutting off said stator casing from a casing body of greater length and then providing said casing with said attachment rings.
7. ~A method according to claim 6, wherein said stator casing is cut off from a casing body that is provided with an elastomeric lining.
8. ~A stator according to claim 1, wherein said inner peripheral surface of said attachment ring widens conically outwardly.
9. ~A stator according to claim 1, wherein said attachment ring has an outer diameter that is practically determined by the greatest amplitude of said spiral of said casing.
10. ~A stator according to claim 1, wherein said attachment ring has an outer diameter that is greater than the greatest amplitude of said spiral of said casing.
11. ~A stator according to claim 1, wherein said attachment ring serves for the fixed connection of hollow cylindrical tubular members that extend coaxial to said stator and can be provided on the inside and/or on the outside with threads.
12. ~A stator according to claim 11, wherein said cylindrical tubular member has an outer diameter that corresponds to that of said attachment ring.
13. ~A stator according to claim 11, wherein an inner surface of said lining merges in a practically step-free manner with an inner peripheral surface of said attachment ring.
14. ~A stator according to claim 13, wherein an inner diameter of said tubular member is determined by the greatest transverse dimension of said inner peripheral surface of said attachment ring.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19804260.4 | 1998-02-04 | ||
| DE19804260A DE19804260C2 (en) | 1998-02-04 | 1998-02-04 | Elastomer stator for an eccentric screw pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2260634A1 CA2260634A1 (en) | 1999-08-04 |
| CA2260634C true CA2260634C (en) | 2008-07-15 |
Family
ID=7856549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002260634A Expired - Fee Related CA2260634C (en) | 1998-02-04 | 1999-02-03 | Elastomeric stator for an eccentric spiral pump |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0935071B1 (en) |
| AT (1) | ATE240460T1 (en) |
| CA (1) | CA2260634C (en) |
| DE (2) | DE19804260C2 (en) |
| ES (1) | ES2199487T3 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19950257B4 (en) * | 1999-10-18 | 2013-01-17 | Wilhelm Kächele GmbH Elastomertechnik | Eccentric screw pump with fully lined stator |
| DE19950258A1 (en) * | 1999-10-18 | 2001-04-26 | Wilhelm Kaechele Gmbh Elastome | Eccentric worm pump or motor has stator with end ring with through opening of essentially similar shape to stator interior, threaded with same pitch and number of turns over ring thickness |
| FR2826407B1 (en) * | 2001-06-21 | 2004-04-16 | Pcm Pompes | SPRAY PUMP STATOR AND PROCESS FOR ITS MANUFACTURE |
| US7131827B2 (en) * | 2003-11-17 | 2006-11-07 | Artemis Kautschuk-Und Kunststoff-Technik Gmbh | Stator for an eccentric screw pump or an eccentric worm motor operating on the moineau principle |
| DE102005028818B3 (en) | 2005-06-22 | 2006-08-24 | Artemis Kautschuk- Und Kunststoff-Technik Gmbh | Stator for an eccentric screw pump comprises axially arranged stator segments connected pressure-tight on their contact points by a tube pulled onto a casing and overlapping the contact points and a radially flattened metal ring |
| CA3153581C (en) | 2014-02-18 | 2024-02-06 | Vert Rotors Uk Limited | Rotary positive-displacement machine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1995353U (en) * | 1965-12-31 | 1968-10-24 | Max Streicher | CLASSIFICATION AND PROTECTION DEVICE FOR ECCENTRIC SCREW PUMPS. |
| NL6815412A (en) * | 1967-11-02 | 1969-05-06 |
-
1998
- 1998-02-04 DE DE19804260A patent/DE19804260C2/en not_active Expired - Fee Related
-
1999
- 1999-01-14 DE DE59905518T patent/DE59905518D1/en not_active Expired - Lifetime
- 1999-01-14 AT AT99100630T patent/ATE240460T1/en not_active IP Right Cessation
- 1999-01-14 EP EP99100630A patent/EP0935071B1/en not_active Expired - Lifetime
- 1999-01-14 ES ES99100630T patent/ES2199487T3/en not_active Expired - Lifetime
- 1999-02-03 CA CA002260634A patent/CA2260634C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE59905518D1 (en) | 2003-06-18 |
| CA2260634A1 (en) | 1999-08-04 |
| ES2199487T3 (en) | 2004-02-16 |
| ATE240460T1 (en) | 2003-05-15 |
| DE19804260C2 (en) | 2003-04-10 |
| DE19804260A1 (en) | 1999-08-12 |
| EP0935071A1 (en) | 1999-08-11 |
| EP0935071B1 (en) | 2003-05-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20140204 |