CA1128154A - Reactor - Google Patents
ReactorInfo
- Publication number
- CA1128154A CA1128154A CA316,543A CA316543A CA1128154A CA 1128154 A CA1128154 A CA 1128154A CA 316543 A CA316543 A CA 316543A CA 1128154 A CA1128154 A CA 1128154A
- Authority
- CA
- Canada
- Prior art keywords
- conductor rods
- annular
- rods
- reactor
- hollow cylinder
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F37/00—Fixed inductances not covered by group H01F17/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2895—Windings disposed upon ring cores
Abstract
"REACTOR"
Abstract of the Disclosure A reactor comprising an insulative annular ease, an annular iron core disposed in the case, a plurality of first conductor rods facing the inner periphery of the case, a plurality of second conductor rods facing the outer periphery of the case, and a plurality of connecting conductors connecting the ends of the first conductor rods to those of the second conductor rods, thereby constituting a spiral current path winding around the annular iron core.
Abstract of the Disclosure A reactor comprising an insulative annular ease, an annular iron core disposed in the case, a plurality of first conductor rods facing the inner periphery of the case, a plurality of second conductor rods facing the outer periphery of the case, and a plurality of connecting conductors connecting the ends of the first conductor rods to those of the second conductor rods, thereby constituting a spiral current path winding around the annular iron core.
Description
5~L
"REACTOR"
Background_of the Invention This invention relates to a reactor for a high voltage, large current semiconductor circuit or the like.
Recently there have been developed power inverters and control apparatus of a great capacity using semi~
conductor devices such as thyristors. The circuit voltage and current of these apparatus are as high as tens to hundreds of kilovolts and as large as tens to lQ hundreds o~ kiloamperes. Reactors to be used in these apparatus are therefore required to withstand such a high voltage and such a large current. Further, it is desired that they should be made as small and light as possible.
A known reactor comprises an insulative annular frame and an annular iron core clisposed in the frame.
A plurality of bundles of lead wire are wound around the case to provide a predetermined current density.
The core-case unit wound with the lead wire is put together with a base plate and other support members.
The core, lead wire and frame constitute an electro-magnetic section, and the base plate and the support members a mechanically reinforcing section. In such a construction of the reactor, the mechanical strength of the frame or the wound lead wire is not fully taken into consideration and the frame does not completely enclose the core, so that the reactor is not strong enough to withstand against a high voltage.
~ f such a known reactor is used in such an apparatus of a large capacity as mentioned above and, is supplied with an excessive current generating a great electromagnetic force, S the lead wire may be deformed or the iron core may be broken.
It may be considerable as a means of solving above problem to enhance the insulations bçtween the core and the conductor and between the conductor and the support members, and to re-inforce the support members, but this would make the reactor more massive and broadens the space between the core and the conductorO A5 a result, more magnetic flux would leak to heat the reactor locally, generate much noise and increase stray current loss.
Summary of the Invention An object of this invention is to provide a reac~or in which conductors and an insulative case containing an iron core not only constitute an electromagnetic section but also work as reinforcing members and the case enclose the iron core completely, thereby making it electrically stronger against a high voltage as well as mechanically stronger against an electromagnetic force generated by an e~cessive current.
Another object of this invention is to provide a reactor which i5 small in size and light in weight.
A reactor according to this invention comprises an annular insulative case cons~ituted by an inner hollow r'` ~
~2~
cylinder, an outer hollow cylinder and a pair of plates cove-ring an annular space between the inner and outer hollow cylinders; an annular iron core disposed in the case; a plurality of inner conductor rods ex-tending in the inner hollow cylinder parallel to one another in the axial direc-tion of the inner hollow cylinder; a plurality of outer con-ductor rods extending outside the outer hollow cylinder paral-lel to one another in the axial direction of the outer hollow cylinder; a plurality of connecting conductors connecting both ends of the inner conductor rods to those of -the outer conductor rods in such a way as to constitute a spiral current path winding around the annular iron core; and a pair of terminals connected to the ends of the current path, respec-tively; said annular insulative case being secured substan-lS tially by means of said inner conductor rods, said outer conductor rods and connecting conductors.
Brief Descrip_ion of the Drawing Fig. 1 is a plan view of one reactor according to this invention;
Fig. 2 is a cross sectional view of the reactor shown in Fig. 1, taken along line II-II in Fig. l;
Fig. 3 is a cross sectional view oE a part of an~ther reactor according to this invention; and Fig. 4 is a plan view of an annular plate used in a further embodiment of this invention.
Detailed Description of the Preferred Embodiments As shown in Figs. 1 and 2, a reactor according to this invention comprises an annular iron core 1 and an insulative annular case 2. The core 1 is an annular piece of iron or a bundle of silicon steel plates and is disposed in the insulative case 2. The case 2 is constituted by an inner hollow cylinder 4, an outer hollow cylinder 5, a square plate 6 having a central opening and a round plate 7 having a cen-tral hole and four holes 3 at the corners. The plates 6 and 7 cover up the annular space between the hollow cylinders 4 and 5. Through the holes 3 the reactor will be secured by means of screws or the like. The hollow cylinders 4 and 5 and the plates 6 and 7 are made of an organic insulative material such as wood and resins or an inorganic insulative material such as glass and ceramics. Instead they may be made of metal and coated with an insulative material.
On the inner wall of the inner hollow cylinder 4 a plurality of inner conductor rods 8 are arranged at regular intervals and extending parallel to one another in the axial direction of the cylinder 4. Each of the inner conductor rods 8 has threaded ends 8a and 8b, which penetrate the plates 6 and 7, respectively. Outside the outer hollow cy-linder 5 a plurality of outer conductor rods 9 are arrangedat regular intervals and extending parallel to one another in the axial direction of the cylinder 5O Each of the outer conductor rods 9 has threaded ends 9a and 9b, which penetrate the plates 6 and 7, respectively.
The reactor further comprises a plurality of connec-ting conductors 10, each having one hole at both ends. The connecting conductors 10 electrically and mechanicall~ connect the inner conductor rods 8 to the outer conductor rods 9 in the following manner. As shown in Fig. 1, the lower end 8b o~
a first inner conductor rod 8A and the lower end 9b of a first outer conductor rod 9A are inserted into the holes of a first connecting conductor lOA, respectively. Two nuts 11 are then turned to secure the connecting conductor lOA onto the sur-face of the round plate 7. The upper end 8a of a s~econd innerconductor rod 8B and the upper end 9a of the outer conductor rod 9A are inserted into the holes of a second connecting con-ductor lOB, respectively, and two nuts 11 are turned to secure the connecting conductor lOB onto the surface of the square plate 6. Then, the lower end 8b of the second inner conductor rod 8B and the lower end 9b o~ a second outer conductor rod 9B
are inserted into the holes of a th:ird connecting conductor lOC, respectively, and two nuts 11 are turned to secure the connec-ting conductor lOC onto the surface of the round plate 7. In similar way, the other connecting conductors 10 connected the inner conductor rods 8 to the outer conductor rods 9. As a result, the conductors rods Q and 9 and the connecting conduc-tors 10 constitute a spiral current path which is winding about the annular iron core 1.
A pair of terminals 12 are connected at one end respectively to the two inner conductor rods 8 which make the end por-tions of the spiral current path. The other end of each terminal 12 extends outside.
Since the insulative case 2 completely enclose the iron core 1, the reactor is electrically strong against a high voltage and mechanlcally strong against an electromagnetic force generated by the core 1 when an excessive current is supplied. Further, the insulative ' case 2 works as a support member to secure the con~
ductor rods 8 and 9 at prescribed positions. The conductor rods 8 and 9 and the connecting conductors 10, which constitute a spiral current path, are steadfastly secured to both plates 6 and 7. Thus, they would not be dislocated even if the iron core 1 generates a large electromagnetic force when an excessive current is supplied thereto.
In the reactor shown in Figs. 1 and 2, the insulative case 2 has a circular cross section. The cross section o the case 2 need not be limited to this.
It may be a rectangular one, an elliptical one or any other cross section, according to the shape of the core 1 and the configurations of the conductor rods 8 and 9 and the connecting conductors 10. The material and shape of the conductor rods and connecting conductors are selected such that the conductor elements have a proper effective cross sectional area with respect to the specific resistance of the material.
In the reactor of Figs. 1 and 2, bolt-nut units are used to connect the conductor rods 8 and 9 to the connecting conductors 10. Instead, each of the connecting conductors 10 may fastens two conductor rods 8 and 9 in such a manner as illustrated in Fig. 3. That is, each connecting conductor 10 has two holes 13, and each conductor rod has at each end a projection 14 which mates with the hole 13 of the connecting conductor 10. This method makes it eas~ to assemble the re-actor. Or the conductor elements 8, 9 and 10 may be welded or riveted. Any fastening method may be employed so long as it promises a good electrical connection between the conduc-tor elements and a sufficient mechanical strength of the resultant spiral current path.
The conductor rods 8 and 5~ and the connecting con-ductors 10 are either solid or hollow. The reactor may beprovided further with such an annular support plate 16 as shown in Fig. 4. The support plate 16 has a plurality of holes 15, through which the outer conductor rods 9 are to extend. It is disposed between the square plate 6 and the round plate 7, thereby to enhance the mechanical strength of the reactor.
As described above, the iron core 1 is completely enclosed in the insulative case 2. The iron core 1 and the conductor elements 8, 9 and 10 constituting a spiral current path around the core 1 are therefore made strong against a high voltage. In addition, since the rod-like ~...... ~
, ~
. ~
s~
conductors 8 and 9 are fastened by means of the con-necting conductors 10, -the spiral current path con-stituted by these conductor elements is extr~mely strong against an electromagnetic force which may be generated when an excessively large cuxrent is supplied. Since the case 2 and the conductor elements 8, 9 and 10 are strong against a high voltage and act as mechanically reinforcing members as well, any special reinforcing members need not be provided. As the lnsulative case
"REACTOR"
Background_of the Invention This invention relates to a reactor for a high voltage, large current semiconductor circuit or the like.
Recently there have been developed power inverters and control apparatus of a great capacity using semi~
conductor devices such as thyristors. The circuit voltage and current of these apparatus are as high as tens to hundreds of kilovolts and as large as tens to lQ hundreds o~ kiloamperes. Reactors to be used in these apparatus are therefore required to withstand such a high voltage and such a large current. Further, it is desired that they should be made as small and light as possible.
A known reactor comprises an insulative annular frame and an annular iron core clisposed in the frame.
A plurality of bundles of lead wire are wound around the case to provide a predetermined current density.
The core-case unit wound with the lead wire is put together with a base plate and other support members.
The core, lead wire and frame constitute an electro-magnetic section, and the base plate and the support members a mechanically reinforcing section. In such a construction of the reactor, the mechanical strength of the frame or the wound lead wire is not fully taken into consideration and the frame does not completely enclose the core, so that the reactor is not strong enough to withstand against a high voltage.
~ f such a known reactor is used in such an apparatus of a large capacity as mentioned above and, is supplied with an excessive current generating a great electromagnetic force, S the lead wire may be deformed or the iron core may be broken.
It may be considerable as a means of solving above problem to enhance the insulations bçtween the core and the conductor and between the conductor and the support members, and to re-inforce the support members, but this would make the reactor more massive and broadens the space between the core and the conductorO A5 a result, more magnetic flux would leak to heat the reactor locally, generate much noise and increase stray current loss.
Summary of the Invention An object of this invention is to provide a reac~or in which conductors and an insulative case containing an iron core not only constitute an electromagnetic section but also work as reinforcing members and the case enclose the iron core completely, thereby making it electrically stronger against a high voltage as well as mechanically stronger against an electromagnetic force generated by an e~cessive current.
Another object of this invention is to provide a reactor which i5 small in size and light in weight.
A reactor according to this invention comprises an annular insulative case cons~ituted by an inner hollow r'` ~
~2~
cylinder, an outer hollow cylinder and a pair of plates cove-ring an annular space between the inner and outer hollow cylinders; an annular iron core disposed in the case; a plurality of inner conductor rods ex-tending in the inner hollow cylinder parallel to one another in the axial direc-tion of the inner hollow cylinder; a plurality of outer con-ductor rods extending outside the outer hollow cylinder paral-lel to one another in the axial direction of the outer hollow cylinder; a plurality of connecting conductors connecting both ends of the inner conductor rods to those of -the outer conductor rods in such a way as to constitute a spiral current path winding around the annular iron core; and a pair of terminals connected to the ends of the current path, respec-tively; said annular insulative case being secured substan-lS tially by means of said inner conductor rods, said outer conductor rods and connecting conductors.
Brief Descrip_ion of the Drawing Fig. 1 is a plan view of one reactor according to this invention;
Fig. 2 is a cross sectional view of the reactor shown in Fig. 1, taken along line II-II in Fig. l;
Fig. 3 is a cross sectional view oE a part of an~ther reactor according to this invention; and Fig. 4 is a plan view of an annular plate used in a further embodiment of this invention.
Detailed Description of the Preferred Embodiments As shown in Figs. 1 and 2, a reactor according to this invention comprises an annular iron core 1 and an insulative annular case 2. The core 1 is an annular piece of iron or a bundle of silicon steel plates and is disposed in the insulative case 2. The case 2 is constituted by an inner hollow cylinder 4, an outer hollow cylinder 5, a square plate 6 having a central opening and a round plate 7 having a cen-tral hole and four holes 3 at the corners. The plates 6 and 7 cover up the annular space between the hollow cylinders 4 and 5. Through the holes 3 the reactor will be secured by means of screws or the like. The hollow cylinders 4 and 5 and the plates 6 and 7 are made of an organic insulative material such as wood and resins or an inorganic insulative material such as glass and ceramics. Instead they may be made of metal and coated with an insulative material.
On the inner wall of the inner hollow cylinder 4 a plurality of inner conductor rods 8 are arranged at regular intervals and extending parallel to one another in the axial direction of the cylinder 4. Each of the inner conductor rods 8 has threaded ends 8a and 8b, which penetrate the plates 6 and 7, respectively. Outside the outer hollow cy-linder 5 a plurality of outer conductor rods 9 are arrangedat regular intervals and extending parallel to one another in the axial direction of the cylinder 5O Each of the outer conductor rods 9 has threaded ends 9a and 9b, which penetrate the plates 6 and 7, respectively.
The reactor further comprises a plurality of connec-ting conductors 10, each having one hole at both ends. The connecting conductors 10 electrically and mechanicall~ connect the inner conductor rods 8 to the outer conductor rods 9 in the following manner. As shown in Fig. 1, the lower end 8b o~
a first inner conductor rod 8A and the lower end 9b of a first outer conductor rod 9A are inserted into the holes of a first connecting conductor lOA, respectively. Two nuts 11 are then turned to secure the connecting conductor lOA onto the sur-face of the round plate 7. The upper end 8a of a s~econd innerconductor rod 8B and the upper end 9a of the outer conductor rod 9A are inserted into the holes of a second connecting con-ductor lOB, respectively, and two nuts 11 are turned to secure the connecting conductor lOB onto the surface of the square plate 6. Then, the lower end 8b of the second inner conductor rod 8B and the lower end 9b o~ a second outer conductor rod 9B
are inserted into the holes of a th:ird connecting conductor lOC, respectively, and two nuts 11 are turned to secure the connec-ting conductor lOC onto the surface of the round plate 7. In similar way, the other connecting conductors 10 connected the inner conductor rods 8 to the outer conductor rods 9. As a result, the conductors rods Q and 9 and the connecting conduc-tors 10 constitute a spiral current path which is winding about the annular iron core 1.
A pair of terminals 12 are connected at one end respectively to the two inner conductor rods 8 which make the end por-tions of the spiral current path. The other end of each terminal 12 extends outside.
Since the insulative case 2 completely enclose the iron core 1, the reactor is electrically strong against a high voltage and mechanlcally strong against an electromagnetic force generated by the core 1 when an excessive current is supplied. Further, the insulative ' case 2 works as a support member to secure the con~
ductor rods 8 and 9 at prescribed positions. The conductor rods 8 and 9 and the connecting conductors 10, which constitute a spiral current path, are steadfastly secured to both plates 6 and 7. Thus, they would not be dislocated even if the iron core 1 generates a large electromagnetic force when an excessive current is supplied thereto.
In the reactor shown in Figs. 1 and 2, the insulative case 2 has a circular cross section. The cross section o the case 2 need not be limited to this.
It may be a rectangular one, an elliptical one or any other cross section, according to the shape of the core 1 and the configurations of the conductor rods 8 and 9 and the connecting conductors 10. The material and shape of the conductor rods and connecting conductors are selected such that the conductor elements have a proper effective cross sectional area with respect to the specific resistance of the material.
In the reactor of Figs. 1 and 2, bolt-nut units are used to connect the conductor rods 8 and 9 to the connecting conductors 10. Instead, each of the connecting conductors 10 may fastens two conductor rods 8 and 9 in such a manner as illustrated in Fig. 3. That is, each connecting conductor 10 has two holes 13, and each conductor rod has at each end a projection 14 which mates with the hole 13 of the connecting conductor 10. This method makes it eas~ to assemble the re-actor. Or the conductor elements 8, 9 and 10 may be welded or riveted. Any fastening method may be employed so long as it promises a good electrical connection between the conduc-tor elements and a sufficient mechanical strength of the resultant spiral current path.
The conductor rods 8 and 5~ and the connecting con-ductors 10 are either solid or hollow. The reactor may beprovided further with such an annular support plate 16 as shown in Fig. 4. The support plate 16 has a plurality of holes 15, through which the outer conductor rods 9 are to extend. It is disposed between the square plate 6 and the round plate 7, thereby to enhance the mechanical strength of the reactor.
As described above, the iron core 1 is completely enclosed in the insulative case 2. The iron core 1 and the conductor elements 8, 9 and 10 constituting a spiral current path around the core 1 are therefore made strong against a high voltage. In addition, since the rod-like ~...... ~
, ~
. ~
s~
conductors 8 and 9 are fastened by means of the con-necting conductors 10, -the spiral current path con-stituted by these conductor elements is extr~mely strong against an electromagnetic force which may be generated when an excessively large cuxrent is supplied. Since the case 2 and the conductor elements 8, 9 and 10 are strong against a high voltage and act as mechanically reinforcing members as well, any special reinforcing members need not be provided. As the lnsulative case
2 completely enclose the iron core 1, no other insulation members need to be arranged between the core 1 and the conductor elements 8, 9 and 10. Thus, the reactor can be made extremely small and light and can therefore be manufactured at a low cost.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A reactor comprising an annular insulative case constituted by an inner hollow cylinder, an outer hollow cy-linder and a pair of plates covering an annular space between the inner and outer hollow cylinders; an annular iron core disposed in the case; a plurality of inner conductor rods extending in the inner hollow cylinder parallel to one ano-ther in the axial direction of the inner hollow cylinder; a plurality of outer conductor rods extending outside the outer hollow cylinder parallel to one another in the axial direction of the outer hollow cylinder; a plurality of connecting con-ductors connecting both ends of the inner conductor rods to those of the outer conductor rods in such a way as to consti-tute a spiral current path winding around the annular iron core; and a pair of terminals connected to the ends of the spiral current path, respectively; said annular insulative case being secured substantially by means of said inner con-ductor rods, said outer conductor rods and connecting conductors.
2. A reactor according to Claim 1, wherein each of said connecting conductors has two holes, each of said inner conductor rod has a projection at each end, and each of said outer conductor rod has a projection at each end, said pro-jections being mated with said holes, whereby each connecting conductor fastens each pair of inner and outer conductor rods.
3. A reactor according to Claim 1, further com-prising an annular plate disposed halfway between said plates and having a plurality of holes through which said outer conductor rods are extending.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP156757/77 | 1977-11-22 | ||
| JP1977156757U JPS5730834Y2 (en) | 1977-11-22 | 1977-11-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1128154A true CA1128154A (en) | 1982-07-20 |
Family
ID=15634645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA316,543A Expired CA1128154A (en) | 1977-11-22 | 1978-11-21 | Reactor |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5730834Y2 (en) |
| CA (1) | CA1128154A (en) |
| CH (1) | CH635702A5 (en) |
| DE (1) | DE2850657C2 (en) |
| FR (1) | FR2409584A1 (en) |
| GB (1) | GB2008858B (en) |
| SE (1) | SE440964B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4524342A (en) * | 1981-12-28 | 1985-06-18 | Allied Corporation | Toroidal core electromagnetic device |
| US4649639A (en) * | 1982-05-21 | 1987-03-17 | Allied Corporation | Method of building toroidal core electromagnetic device |
| DE4221769C1 (en) * | 1992-07-02 | 1994-01-27 | Abb Patent Gmbh | Producing inductive constructional component - winding at least one winding around magnet core emerging from floor plate and core plate between which are vertical metal bar groups. |
| DE102004039230A1 (en) | 2004-08-12 | 2006-02-23 | Epcos Ag | Inductive component for high currents and method for its production |
| DE102005006344A1 (en) | 2005-02-11 | 2006-08-17 | Epcos Ag | Insulating part and toroidal core choke |
| JP2016187031A (en) * | 2014-12-19 | 2016-10-27 | 株式会社村田製作所 | Coil component and method of producing the same |
| DE102018111468A1 (en) * | 2018-05-14 | 2019-11-14 | Schaffner International AG | Throttle with busbar windings |
| DE102019215514A1 (en) * | 2019-10-10 | 2021-04-15 | Robert Bosch Gmbh | Common mode choke |
| DE102019215521A1 (en) * | 2019-10-10 | 2021-04-15 | Robert Bosch Gmbh | Common mode choke |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR52973E (en) * | 1943-06-24 | 1945-08-27 | Licentia Gmbh | Switching reactance for contact converters |
| CH290733A (en) * | 1950-05-26 | 1953-05-15 | Siemens Ag | Choke coil. |
| DE968215C (en) * | 1953-02-28 | 1958-01-23 | Purrmann & Herr G M B H | Composable primary winding for current transformer consisting of full copper conductors |
| DE1266378B (en) * | 1960-09-29 | 1968-04-18 | Siemens Ag | Suppression choke combination for high currents |
| DE1208811B (en) * | 1961-05-18 | 1966-01-13 | Licentia Gmbh | For different nominal currents switchable winding current transformer |
| US3319207A (en) * | 1963-07-18 | 1967-05-09 | Davis Jesse | Grooved toroidal body with metal filling |
| US3321725A (en) * | 1965-12-16 | 1967-05-23 | Gen Electric | Current transformers having multiturn primary windings |
| JPS5020152B2 (en) * | 1971-07-15 | 1975-07-12 | ||
| JPS5330991Y2 (en) * | 1973-06-15 | 1978-08-02 |
-
1977
- 1977-11-22 JP JP1977156757U patent/JPS5730834Y2/ja not_active Expired
-
1978
- 1978-11-14 GB GB7844472A patent/GB2008858B/en not_active Expired
- 1978-11-21 FR FR7832830A patent/FR2409584A1/en active Granted
- 1978-11-21 SE SE7811977A patent/SE440964B/en not_active IP Right Cessation
- 1978-11-21 CA CA316,543A patent/CA1128154A/en not_active Expired
- 1978-11-22 CH CH1199278A patent/CH635702A5/en not_active IP Right Cessation
- 1978-11-22 DE DE2850657A patent/DE2850657C2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5482345U (en) | 1979-06-11 |
| SE7811977L (en) | 1979-05-23 |
| DE2850657C2 (en) | 1982-04-29 |
| CH635702A5 (en) | 1983-04-15 |
| JPS5730834Y2 (en) | 1982-07-07 |
| GB2008858A (en) | 1979-06-06 |
| SE440964B (en) | 1985-08-26 |
| FR2409584A1 (en) | 1979-06-15 |
| FR2409584B1 (en) | 1982-02-05 |
| GB2008858B (en) | 1982-05-19 |
| DE2850657A1 (en) | 1979-05-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |