CA1167394A - Hose for peristaltic pumps - Google Patents
Hose for peristaltic pumpsInfo
- Publication number
- CA1167394A CA1167394A CA000386678A CA386678A CA1167394A CA 1167394 A CA1167394 A CA 1167394A CA 000386678 A CA000386678 A CA 000386678A CA 386678 A CA386678 A CA 386678A CA 1167394 A CA1167394 A CA 1167394A
- Authority
- CA
- Canada
- Prior art keywords
- hose
- rubber
- reinforcement
- core
- produced
- 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
Links
- 230000002572 peristaltic effect Effects 0.000 title claims abstract description 5
- 230000002787 reinforcement Effects 0.000 claims abstract description 20
- 229920001971 elastomer Polymers 0.000 claims abstract description 14
- 239000000806 elastomer Substances 0.000 claims abstract description 6
- 238000004073 vulcanization Methods 0.000 claims description 8
- 244000043261 Hevea brasiliensis Species 0.000 abstract description 7
- 229920003052 natural elastomer Polymers 0.000 abstract description 7
- 229920001194 natural rubber Polymers 0.000 abstract description 7
- 239000000470 constituent Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 241000689227 Cora <basidiomycete fungus> Species 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229920002681 hypalon Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/0009—Special features
- F04B43/0054—Special features particularities of the flexible members
- F04B43/0072—Special features particularities of the flexible members of tubular flexible members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Reciprocating Pumps (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention relates to a hose for peristaltic pumps constituted by a core of elastomer or rubber, a first reinforcement, a layer of non-vulcanizable gum, a second reinforcement, an external sheathing of natural rubber, a flange, a stop-collar and an external ridge in natural rubber, bonded and culcanized onto the external sheathing.
The present invention relates to a hose for peristaltic pumps constituted by a core of elastomer or rubber, a first reinforcement, a layer of non-vulcanizable gum, a second reinforcement, an external sheathing of natural rubber, a flange, a stop-collar and an external ridge in natural rubber, bonded and culcanized onto the external sheathing.
Description
The present invention relates to hoses for use with perostaltic pumps.
The hoses used with peristaltic pumps are subjected to much strain and constitute wearing parts which need to be replaced rather often. It is therefore necessary to provide hoses which will be-tter withstand the repeated strains to which they are subjected. Such hoses should also, on the one hand, wear longer, even though with the disadvantage that their suction capacity reduces rapidly and, on the other hand, they should be adaptable to the conveying of a large number of products.
It is the object of the present invention to fulfill all these requirements by proposing a new hose for peris-taltic pumps which is constituted by a tubular central core produced with no junction plane in rubber or in elastomer, by a first reinforcement placed on the outer surface of the core, which is in the form of a gauze with meshes between 0.5 and 1 mm, oriented so as to form an angle of between 30 and 60~ (and preferably 451 wlth the longitudinal axis of the core, by a layer of non-vulcan-izable gum deposited on the first reinforcement, by a second reinforcement placed over the said layer of gum, and by an external sheathing produced with no junction plane, in rufi~er.
According to a preferred embodiment of the invention, the thickness ratio between the different constituents of the hose is such that the reinforcements and the gum layer are substantially situated at one third of the total thickness of the hose as measured from the inner surface of the core. Also, the thickness of the gum layer willadvantageously be equal to 1 mm.
The hose according to the invention further com-prises at least one end flange, which is produced separate-~ n rubber, with no junction plane, and is fitted by bonding-vulcanization on one end of the hose. In the 1~73~
case where only one flange is fitted on the hose, said latter will be advantageously equipped with a stop-collar in rubber, with no junction plane, said collar forming a support for a removable flange and being ~itted by bonding-vulcanization on the other end.
The hose according to the invention finally compri-ses a guiding ridge which is added on along one of its external generating lines by bonding-vulcanization.
The invention will be more readily understood on reading the following description with reference to the accompanying drawings in which :
- Figure 1 is a longitudinal cross-section of a hose according to the invention;
- Figure 2 ~s a cross-section along II-II of Figure l;
- Figure 3 is an external partial view of the cora equipped with its first reinforcing gauze;
- Figure 4 is a longitudinal cross-section of the ~ complete hose equipped with its collar, flange and ridge;
- Figure 5 is a cross-section along V-V of Figure 4, Referring first to Figures 1, 2 and 3, these show that the hose according to the invention comprises, starting from the inside, a central core 1, made of natural or synthet~c rufifier, w~th no junction plane, i.e. produced by extrusion or rovinq, and not by molding. It may equally be produced from an elas-tomer (chloroprene, butylnitrile, a product known under the trademark "Hypalon"...). The said core is then covered with a first reinforcement which is in the form of a gauze of~polyamide, rayon, or a wire netting,... with meshes of between 0.5 and 1 mm. Said gauze 2 is oriented with respect to the axis 3 of the tubular core 1 so that its warps and`wefts form an angle A and B of between 30 and 60 with said axis. Preferably, the angle will be 45.
On this first reinforcement is applied a layer 4 of non-vulcanizable gum and a second reinforcement 5. The texture of this reinforcement will be selected in relation to the characteristics required for the hose and can be identical to that of the first reinforcement. The resulting assembly is then covered with an external sheathing ~ in natural rubber. A composite hose is thus obtained which shows a number of advantages in view of the hoses known up to now.
For example, the first reinforcement enables the life of the hose to be, lengthened by restrainin~ the wearing -down of the core through internal abrasion at the end points of the area squeezed by the passage of the rollers, which abrasion can lead to the hose becoming perforated or breaking. The said first reinforcement further permits limit-ation f the stresses inside the entire hose assem~ly and inside the core, especially by forming a holding member for the material which tends to be carried away by the rollers squeezing it. The non-vulcanizable gum constitutes a securing agent, securing the first reinforcement to the core, the second reinforcement and the external sheathing to the inside part, and this due to its great plasticity which enables it to pass through the meshes of the gauzes and due to its bonding qualities which make it the bonding element of the entire hose. This gum also protects the hose against shearin~. Finally, the choice of natural rubber for the external sheathing is determined by the high qualities of this material from the point of view of its elasticity and,of its ready adherence to the remov-able elements.
It should also be noted that the thicknesses ofthe different constituents of the hose have been deter-mined so that the gum and the two reinforcements are situated at about one third of the overall thickness of the hose, as measured from its internal face. This dis-position is the one which when tested has given the bestresults. Moreover, the thickness of the gum does not ex-ceed 1 mm, this being the optimal thickness to preser~e all the qualities of the gum without suffering any of the drawbacks (amongst which, too great a plasticity which would affect the behavior of the hose).
Figures 4 and 5 show a hose such as described here-inabove with the same references but eq~ipped with re-movable elements. One of these elements is an end flange 7 produced by injection (i.e. with no junction plane) in natural rubber, and secured by bonding-vulcanization on a cut-in portion at the end of the hose 1 to 6, At another end of the hose has also been fitted by bonding-vulcani-zation a stop-collar 8, which is equally produced by injection, therefore with no junction plane. Said collar is provided with a groove 8a in which can be fitted a removable flange, not shown. Such flange is fitted in by way of notches provided both in the external side of the collar 8 and in the flange, in the same was as a socket type fitting.
Finally, over the whole length of an external generating line of the hose, is fitted a rib 9 or ridge, the function of which is to keep the hose centered inside the pump body. Said ridge is also bonded and vulcanized and is made of natural rubber.
Besides the advantages mentioned hereinabove, it will be noted that a hose, produced this way, is more "nervous", i.e. it retains a better elasticity when in service, the permanent deformation caused by the squeezing by the rollers of the pump being limited~ As a result, the volume of the chamber of the pump is better supported and the flow is more stable, the shape recove-ries are more rapid, this permitting higher speeds of rotation or a better filling of the chambers when vis-cous products are pumped up, hence a better flow rate, 73SI ~
It is also possible with the hose according to theinvention to obtain a higher delivery pressure, And since the hose is produced wlth no junction planes in any of its constituents, it is more homogeneous and therefore stronger than a hose produced by assembly or by folding of a flat piece, It should also be noted that the material cons-tituting the core can be selected and be-for example an elastomer suitable for the product conveyed. Considering the characteristics of these elastomers, it would have been impossible to use them as sole constituent of the hose because, used in very thick layers, these materials would not withstand the wear and tear imposed upon them, Finally, the hose is designed so that, as shown in Figure 4, only the core is in contact with the pumped product taccounting for the presence of the known connecting sleeves). Therefore, whatever thè product, the end members of the hose are made of natural rubber.
It will be advantageous for the length of the hose to be such that once fitted in the pump body, it is slightly squeezed at both ends, this preventing r~sk of the removable parts detaching themselves.
The invention finds an advantageous application in the production of pumps. It is in no way limited to the description given hereinabove, but on the contrary cover any variants that can be brought thereto without depart-ing from the scope or the spirit thereof.
The hoses used with peristaltic pumps are subjected to much strain and constitute wearing parts which need to be replaced rather often. It is therefore necessary to provide hoses which will be-tter withstand the repeated strains to which they are subjected. Such hoses should also, on the one hand, wear longer, even though with the disadvantage that their suction capacity reduces rapidly and, on the other hand, they should be adaptable to the conveying of a large number of products.
It is the object of the present invention to fulfill all these requirements by proposing a new hose for peris-taltic pumps which is constituted by a tubular central core produced with no junction plane in rubber or in elastomer, by a first reinforcement placed on the outer surface of the core, which is in the form of a gauze with meshes between 0.5 and 1 mm, oriented so as to form an angle of between 30 and 60~ (and preferably 451 wlth the longitudinal axis of the core, by a layer of non-vulcan-izable gum deposited on the first reinforcement, by a second reinforcement placed over the said layer of gum, and by an external sheathing produced with no junction plane, in rufi~er.
According to a preferred embodiment of the invention, the thickness ratio between the different constituents of the hose is such that the reinforcements and the gum layer are substantially situated at one third of the total thickness of the hose as measured from the inner surface of the core. Also, the thickness of the gum layer willadvantageously be equal to 1 mm.
The hose according to the invention further com-prises at least one end flange, which is produced separate-~ n rubber, with no junction plane, and is fitted by bonding-vulcanization on one end of the hose. In the 1~73~
case where only one flange is fitted on the hose, said latter will be advantageously equipped with a stop-collar in rubber, with no junction plane, said collar forming a support for a removable flange and being ~itted by bonding-vulcanization on the other end.
The hose according to the invention finally compri-ses a guiding ridge which is added on along one of its external generating lines by bonding-vulcanization.
The invention will be more readily understood on reading the following description with reference to the accompanying drawings in which :
- Figure 1 is a longitudinal cross-section of a hose according to the invention;
- Figure 2 ~s a cross-section along II-II of Figure l;
- Figure 3 is an external partial view of the cora equipped with its first reinforcing gauze;
- Figure 4 is a longitudinal cross-section of the ~ complete hose equipped with its collar, flange and ridge;
- Figure 5 is a cross-section along V-V of Figure 4, Referring first to Figures 1, 2 and 3, these show that the hose according to the invention comprises, starting from the inside, a central core 1, made of natural or synthet~c rufifier, w~th no junction plane, i.e. produced by extrusion or rovinq, and not by molding. It may equally be produced from an elas-tomer (chloroprene, butylnitrile, a product known under the trademark "Hypalon"...). The said core is then covered with a first reinforcement which is in the form of a gauze of~polyamide, rayon, or a wire netting,... with meshes of between 0.5 and 1 mm. Said gauze 2 is oriented with respect to the axis 3 of the tubular core 1 so that its warps and`wefts form an angle A and B of between 30 and 60 with said axis. Preferably, the angle will be 45.
On this first reinforcement is applied a layer 4 of non-vulcanizable gum and a second reinforcement 5. The texture of this reinforcement will be selected in relation to the characteristics required for the hose and can be identical to that of the first reinforcement. The resulting assembly is then covered with an external sheathing ~ in natural rubber. A composite hose is thus obtained which shows a number of advantages in view of the hoses known up to now.
For example, the first reinforcement enables the life of the hose to be, lengthened by restrainin~ the wearing -down of the core through internal abrasion at the end points of the area squeezed by the passage of the rollers, which abrasion can lead to the hose becoming perforated or breaking. The said first reinforcement further permits limit-ation f the stresses inside the entire hose assem~ly and inside the core, especially by forming a holding member for the material which tends to be carried away by the rollers squeezing it. The non-vulcanizable gum constitutes a securing agent, securing the first reinforcement to the core, the second reinforcement and the external sheathing to the inside part, and this due to its great plasticity which enables it to pass through the meshes of the gauzes and due to its bonding qualities which make it the bonding element of the entire hose. This gum also protects the hose against shearin~. Finally, the choice of natural rubber for the external sheathing is determined by the high qualities of this material from the point of view of its elasticity and,of its ready adherence to the remov-able elements.
It should also be noted that the thicknesses ofthe different constituents of the hose have been deter-mined so that the gum and the two reinforcements are situated at about one third of the overall thickness of the hose, as measured from its internal face. This dis-position is the one which when tested has given the bestresults. Moreover, the thickness of the gum does not ex-ceed 1 mm, this being the optimal thickness to preser~e all the qualities of the gum without suffering any of the drawbacks (amongst which, too great a plasticity which would affect the behavior of the hose).
Figures 4 and 5 show a hose such as described here-inabove with the same references but eq~ipped with re-movable elements. One of these elements is an end flange 7 produced by injection (i.e. with no junction plane) in natural rubber, and secured by bonding-vulcanization on a cut-in portion at the end of the hose 1 to 6, At another end of the hose has also been fitted by bonding-vulcani-zation a stop-collar 8, which is equally produced by injection, therefore with no junction plane. Said collar is provided with a groove 8a in which can be fitted a removable flange, not shown. Such flange is fitted in by way of notches provided both in the external side of the collar 8 and in the flange, in the same was as a socket type fitting.
Finally, over the whole length of an external generating line of the hose, is fitted a rib 9 or ridge, the function of which is to keep the hose centered inside the pump body. Said ridge is also bonded and vulcanized and is made of natural rubber.
Besides the advantages mentioned hereinabove, it will be noted that a hose, produced this way, is more "nervous", i.e. it retains a better elasticity when in service, the permanent deformation caused by the squeezing by the rollers of the pump being limited~ As a result, the volume of the chamber of the pump is better supported and the flow is more stable, the shape recove-ries are more rapid, this permitting higher speeds of rotation or a better filling of the chambers when vis-cous products are pumped up, hence a better flow rate, 73SI ~
It is also possible with the hose according to theinvention to obtain a higher delivery pressure, And since the hose is produced wlth no junction planes in any of its constituents, it is more homogeneous and therefore stronger than a hose produced by assembly or by folding of a flat piece, It should also be noted that the material cons-tituting the core can be selected and be-for example an elastomer suitable for the product conveyed. Considering the characteristics of these elastomers, it would have been impossible to use them as sole constituent of the hose because, used in very thick layers, these materials would not withstand the wear and tear imposed upon them, Finally, the hose is designed so that, as shown in Figure 4, only the core is in contact with the pumped product taccounting for the presence of the known connecting sleeves). Therefore, whatever thè product, the end members of the hose are made of natural rubber.
It will be advantageous for the length of the hose to be such that once fitted in the pump body, it is slightly squeezed at both ends, this preventing r~sk of the removable parts detaching themselves.
The invention finds an advantageous application in the production of pumps. It is in no way limited to the description given hereinabove, but on the contrary cover any variants that can be brought thereto without depart-ing from the scope or the spirit thereof.
Claims (7)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Hose for peristaltic pumps, wherein said hose comprises:
- a tubular central core produced, with no junction plane, in rubber or elastomer;
- a first reinforcement placed on the outer surface of the core in the form of a gauze with meshes between 0.5 and 1 mm and oriented between 30 and 60° with respect to the longitudinal axis of the core;
- a layer of non-vulcanizable gum;
- a second reinforcement - and an external sheathing produced, with no junction plane, in rubber.
- a tubular central core produced, with no junction plane, in rubber or elastomer;
- a first reinforcement placed on the outer surface of the core in the form of a gauze with meshes between 0.5 and 1 mm and oriented between 30 and 60° with respect to the longitudinal axis of the core;
- a layer of non-vulcanizable gum;
- a second reinforcement - and an external sheathing produced, with no junction plane, in rubber.
2. Hose as claimed in claim 1, wherein the reinforcements and the gum layer are situated at about one third of the thickness of the hose as measured from its inner surface.
3. Hose as claimed in claim 2, wherein the thickness of the gum layer is substantially equal to 1 mm.
4. Hose as claimed in claim 3, wherein the first reinforcement is inclined so as to form an angle of 45° with the longitudinal axis of the core.
5. Hose as claimed in claim 1, wherein said hose is equipped with an end flange produced separately in rubber, with no junction plane, and fitted by bonding-vulcanization on one end of the hose.
6. Hose as claimed in claim 5, wherein said hose comprises a stop collar produced in rubber, with no junction plane, forming support for a removable flange and fitted by bonding-vulcanization on the other end.
7. Hose as claimed in claim 5, wherein said hose comprises a guiding ridge in rubber fitted along a generating line of the hose by bonding-vulcanization.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8020597A FR2490774A1 (en) | 1980-09-25 | 1980-09-25 | TUBE FOR PERISTALTIC PUMPS |
| FR8020597 | 1980-09-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1167394A true CA1167394A (en) | 1984-05-15 |
Family
ID=9246280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000386678A Expired CA1167394A (en) | 1980-09-25 | 1981-09-25 | Hose for peristaltic pumps |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS58131386A (en) |
| BE (1) | BE890472A (en) |
| CA (1) | CA1167394A (en) |
| DE (1) | DE3138005A1 (en) |
| FR (1) | FR2490774A1 (en) |
| GB (1) | GB2084287B (en) |
| IT (2) | IT8153630V0 (en) |
| NL (1) | NL187928C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2647464B2 (en) * | 1988-10-28 | 1997-08-27 | 横浜ゴム株式会社 | hose |
| US4989643A (en) * | 1988-12-20 | 1991-02-05 | Chase-Walton Elastomers, Inc. | High performance composite hose |
| JPH0326888A (en) * | 1989-06-23 | 1991-02-05 | Tokai Rubber Ind Ltd | Pumping tube |
| US6168397B1 (en) * | 1997-07-01 | 2001-01-02 | Daiichi Techno Co., Ltd. | Flexible tube of squeeze pump |
| DE19814728A1 (en) * | 1998-04-02 | 1999-10-07 | Alfa Laval Flow Gmbh | Peristaltic pump and use for a transport hose with safety channel |
| SE521553C2 (en) * | 2000-07-05 | 2003-11-11 | Bo Gutaa | Peristaltic pump |
| WO2009006649A1 (en) * | 2007-07-04 | 2009-01-08 | Raymond William Hinks | Peristaltic pump hose |
| CN104154348A (en) * | 2014-08-06 | 2014-11-19 | 杨继广 | Water pipe special for peristaltic pump |
| FR3032751B1 (en) * | 2015-02-12 | 2018-08-10 | Bertrand Boisseau Du Rocher | PERISTALTIC PUMP. |
| CN112413242B (en) * | 2020-12-07 | 2022-03-25 | 江苏科信光电科技有限公司 | Sun-proof reinforcement type polyethylene pipe |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3112772A (en) * | 1961-02-09 | 1963-12-03 | Porter Co Inc H K | Elastomeric composition and method of bonding elastomers to ferrous and like metals |
| GB962381A (en) * | 1962-04-26 | 1964-07-01 | Goodyear Tire & Rubber | Flexible tubular structures, particularly hoses |
| NL6706959A (en) * | 1966-06-08 | 1967-12-11 | ||
| DE7242485U (en) * | 1971-11-24 | 1973-03-29 | Seyler L | Peristaltic pump |
| BE790709A (en) * | 1971-11-24 | 1973-02-15 | Seyler Leon A | DEVICE FOR DELIVERY OF A LIQUID UNDER PRESSURE |
| JPS5413029Y2 (en) * | 1974-07-08 | 1979-06-05 | ||
| FR2336570A1 (en) * | 1975-12-23 | 1977-07-22 | Delasco Sa | ELASTIC DEFORMABLE TUBE CONSTITUTING THE BODY OF A PERISTALTIC FLUID PUMP |
-
1980
- 1980-09-25 FR FR8020597A patent/FR2490774A1/en active Granted
-
1981
- 1981-09-23 GB GB8128792A patent/GB2084287B/en not_active Expired
- 1981-09-24 IT IT8153630U patent/IT8153630V0/en unknown
- 1981-09-24 IT IT68237/81A patent/IT1145110B/en active
- 1981-09-24 DE DE19813138005 patent/DE3138005A1/en active Granted
- 1981-09-24 BE BE2/59379A patent/BE890472A/en not_active IP Right Cessation
- 1981-09-25 JP JP56150808A patent/JPS58131386A/en active Granted
- 1981-09-25 CA CA000386678A patent/CA1167394A/en not_active Expired
- 1981-09-25 NL NLAANVRAGE8104424,A patent/NL187928C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GB2084287B (en) | 1984-08-30 |
| IT8153630V0 (en) | 1981-09-24 |
| BE890472A (en) | 1982-03-24 |
| FR2490774A1 (en) | 1982-03-26 |
| DE3138005A1 (en) | 1982-04-15 |
| IT1145110B (en) | 1986-11-05 |
| IT8168237A0 (en) | 1981-09-24 |
| GB2084287A (en) | 1982-04-07 |
| JPS58131386A (en) | 1983-08-05 |
| JPH0211749B2 (en) | 1990-03-15 |
| NL187928B (en) | 1991-09-16 |
| NL8104424A (en) | 1982-04-16 |
| FR2490774B1 (en) | 1985-03-29 |
| DE3138005C2 (en) | 1990-12-20 |
| NL187928C (en) | 1992-02-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |