GB1560319A - Control device for thyrisor-fed d c motor - Google Patents
Control device for thyrisor-fed d c motor Download PDFInfo
- Publication number
- GB1560319A GB1560319A GB53331/77A GB5333177A GB1560319A GB 1560319 A GB1560319 A GB 1560319A GB 53331/77 A GB53331/77 A GB 53331/77A GB 5333177 A GB5333177 A GB 5333177A GB 1560319 A GB1560319 A GB 1560319A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plug
- connector portion
- control
- printed circuit
- motor
- 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
- 230000006870 function Effects 0.000 claims abstract description 12
- 239000004020 conductor Substances 0.000 claims description 12
- 238000000429 assembly Methods 0.000 claims description 6
- 230000007659 motor function Effects 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 5
- 238000005476 soldering Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/14—Mounting supporting structure in casing or on frame or rack
- H05K7/1438—Back panels or connecting means therefor; Terminals; Coding means to avoid wrong insertion
- H05K7/1457—Power distribution arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/14—Mounting supporting structure in casing or on frame or rack
- H05K7/1438—Back panels or connecting means therefor; Terminals; Coding means to avoid wrong insertion
- H05K7/1439—Back panel mother boards
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/14—Structural association of two or more printed circuits
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Control Of Direct Current Motors (AREA)
- Rectifiers (AREA)
- Inverter Devices (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Combinations Of Printed Boards (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Control Of Electric Motors In General (AREA)
- Distribution Board (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
The controller consists of a basic apparatus having a housing (64, 65) and a motherboard (6) on the rear side with female connector strips (611-615). Printed-circuit boards (x1-x5) for power supply, power control, issuing commands for multi-quadrant drive, rotation speed and/or traction control and interlocking and/or protection purposes can be plugged into the basic apparatus. Splitting the functions onto the individual printed-circuit boards, makes it possible to manage with a relatively simple motherboard. <IMAGE>
Description
(54)CONTROLDEVICEFOR THYRISTOR-FED D.C.
MOTOR
(71) We, SIEMENS AxEENGESELL SCHAFT, a German company, of Berlin and
Munich, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to a control device for a thyristor-fed direct-current motor.
According to the present invention there is provided a control device for a thyristorfed d.c. motor, the device comprising:
a housing;
a base wiring plate carried by the housing, the base plate being provided with terminals for receiving external signals and supply voltages, with first and second connector portions of a plug-in type, and with electrical connections between said terminals and connector portions;
a first printed circuit board carrying a power supply for the device and an electrical connector portion adapted to plug into said first connector portion; and
a second printed circuit board carrying current control circuitry for outputting control signals for thyristors of a d.c. motor, the second board carrying an electrical connector portion adapted to plug into said connector portion.
For a better understanding of the invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which:
Figure 1 is a block circuit diagram of a control device in accordance with the invention, for a d.c. motor;
Figure 2 illustrates a base wiring plate of the device;
Figure 3 is a perspective view showing the mechanical construction of a base unit of the device;
Figure 4 illustrates one example of the
mechanical construction of a first printed
circuit board carrying a power supply unit;
Figure 5 illustrates one example of the
construction of a second printed circuit
board carrying a current controller; and
Figure 6 is a detail view of one example
of a terminal block and a base plate.
In Figure 1, the armature winding of a
direct-current motor 1 is fed from a three
phase current supply system 4 having phases
R, S, T through a reversing drive convertor,
which comprises two anti-parallel-connected
thyristor sets 2 and 3 in an arrangement free
from circulating current.
From the speed regulation of the direct
current motor 1, the actual speed ni of the
latter is sensed by a tacho-generator 5, and
the output signal of the latter is applied
to a speed controller 28 together with a
signal for a desired speed value n5. The
output signal of the speed controller 28 (line
19) constitutes the reference input for a
current controller 8, which receives a signal
proportional to the armature-current actual
value Ii, with correct sign (line 20), from a
current transformer 40 provided in the
armature current circuit of the direct
current motor 1. Depending upon the cur
rent direction chosen, the output signal of
the current controller 8 is applied either
directly through a switch 16, or through an
inverting amplifier 15 and a switch 17, to
the input of an input amplifier 9, at which
the inverter and rectifier phase angle limit (?,,a,) can be set. The output of the input
amplifier 9 is connected via a line 22 to the
inputs of comparison elements 11, to the
other inputs of which there are connected
sawtooth integrators 10. These sawtooth
integrators receive from a power supply unit
7 synchronising voltages U5 for the starting points of the sawtooth integrations. The
power supply unit 7 serves also to provide
supply voltages Uv for the individual circuit
elements of the device. With equality of the output signals of the input amplifier 9 and of the sawtooth integrators 10, the re
spective comparator 11 applies a firing sigal to a respective thyristor of the thyristor set 2, via an associated output amplifier 12 and a line 32. There are connected to the comparators 11, in parallel with the output stages 12, output stages 18, which are connected to the thyristor set 3 through a line 33. For inhibiting and enabling the individual output stages 12 and 18 respectively, there is employed a control unit in the form of a command stage 14, which presets along lines 26 and 27 corresponding control instructions depending upon a desired torque direction.
The following control functions are performed by the command stage 14.
(i) Determination of the polarity change at the output of the speed controller 25 (line 25).
(ii) Limitaiton of the speed controller output and isolation of the control set from the current controller by opening of the switch 16 via a line 29. In this way, the control pulses are shifted to the phase angle limit, whereby the armature current is rapidly reduced. When the armature current reaches zero, and after expiry of a delay time, the control pulses are blocked at the hitherto conducting converters by a blocking signal S along the line 26. After an interval of time, the current controller 8 is re-coupled to the input amplifier 9 by
means of the inverting amplifier 15 and the switch 17 (line 30) and in addition the control pulses for the new torque direction are enabled. At the same time, the limitation of the output of the speed controller 28 is then also cancelled (line 23).
The command stage 14 provides for multiquadrant operation. However, if the com mand stage 14 is not provided, together with the corresponding associated switching mechanisms, and a singlequadrant operation is sufficient, a bridge 21 may be interposed between the current amplifier 8 and the output amplifier 9.
The chain-lined connections in the arrangement shown in Figure 1 between the individual circuits are formed by the wiring on a base wiring plate 6, which in turn constitutes part of a base unit X0.
The power supply unit is mounted on a first printed circuit board X1, adapted to be plugged into the base unit X0. The current controller and the output amplifiers 12 are mounted on a second printed circuit board X2, adapted to be plugged into the base unit XO. The command stage 14, the inverting amplifier 15, the switches 16 and 17 and the output stages 18 are mounted on a third printed circuit board X3, and the speed controller 28 is mounted on a fourth printed circuit board X4.
This relative arrangement is clarified by the printed circuit board designations XO to X4 placed in brackets after the reference numerals, in Figure 1.
Electrical access to the base wiring plate 6 for external signals is by way of a terminal block 63 which is soldered to the base wiring plate 6 and the electrical connection of which to the base plate 6 is denoted by 13.
Figure 2 illustrates, diagrammatically, the base wiring plate 6 with the conductor paths 62 and individual printed circuit boards X1 to X5. X5 designates a fifth printed circuit board which carries protective circuitry (such as interlocking circuitry) for the control device. Details of such circuitry are not shown in Figure 1.
The base unit XO illustrated in Figure 3 serves for the mechanical and electrical combination of a maximum of five printed circuit boards. A housing of the base unit consists of two lateral sheet-steel portions 64 which are screwed together with the interposition of profiled aluminium bars 65.
The rear side is formed by the base wiring plate 6 (which may, itself, be a printed circuit board). The front side is protected by a removable panel of insulating material (not shown). The base wiring plate 6 carries five 31-pole socket strips 611 to 615, as well as the terminal block 63. consisting of terminals (for example, terminals 631 as shown in Figure 6) secured in position by soldering.
Incoming signal conductors 632 can be introduced into the said terminals 631 and made fast by screws 633 (Figure 6). As is apparent, the lower end of each terminal 631 is provided with two contact pins 634 leading to the rear-side conductor paths 62 of the base plate 6, and is electrically connected to the said conductor paths by soldering at 635.
Figure 4 illustrates one example of the mechanical construction of the first printed circuit board X1 for the power supply and for the derivation of the synchronising voltages U5. As is apparent, there is disposed upon the conductor plate, inter alia, a transformer 73 and rectifiers 74, which are connected together by way of conductor paths 75 of the board X1. For the electrical connection to the basic wiring plate 6, there is used a plug strip 72, which in combination with the socket strip 611 of the basic wiring plate 6 forms a plug-in connection.
As is apparent from Figure 5, which shows one example of the mechanical construction of the second printed circuit board
X2, there may be provided, in addition to a plug strip 82 for connection to the plate 6 via the strip 612, a further plug strip 83 which is electrically connected to the output amplifiers and on to which there is adapted to be pushed a socket strip of a signal strip cable constituting the line 32 (Figure 1), leading to the thyristor convertors.
The remaining printed circuit boards X3
to X5 have plug strips similar to 72 and
82, for connection with the socket strips 613 to 615 respectively.
Thus, the boards X1 to X5 may be plugged into the base plate 6 as desired, so that certain boards may be omitted or exchanged.
A control device operating on the general principles of the above described circuitry is disclosed, for example, in German
Auslegeschrift 1 588 783 or Siemens-Zeitschrift 1971, pages 183 to 185.
In this known arrangement, the speed controller, the current controller, the com
mand stage and the control set each consist of slide-in trays, in which the individual
semiconductor elements are disposed on conductor plates bearing printed circuits (see
Figure 1 of the literature reference).
In addition, there is already known a plug-in connection system for electronic sub-assemblies which are disposed in a slidein tray system, wherein a number of subassemblies are each adapted to be pushed into rear-side electrical plug-in conections of a sub-assembly support, and at least some of the terminal connecting pins of the plug-in connections of each sub-assembly support extend through a base wiring plate bearing a printed circuit and are soldered into the conductor paths thereon (see, for example, German Offenlegungsschrift 2 320255).
We have found that, in drive-regulating systems, sub-assemblies and circuit parts such as, for example, current controllers, control sets and the like, alway perform like functions, and other parts such as, for example, speed controllers, torque controllers and the like, always perform very similar functions. It therefore appears to be desirable to provide standard combinations which are suitable for all drive regulations which may be required. Standard combinations of sub-assemblies can per se be readily wired together by passing the terminal connecting pins on the pin side of the terminal strips through a wiring plate which comprises the conductor paths necessary for the
wiring. If it is desired, for reasons of
economy to limit the number of base wiring plates, the choice of the possible combinations will generally be very limited.
However, it may be appreciated that, in the illustrated embodiments of the invention,
there may be obtained, with one base wiring plate, a compact control device for thyristorfed direct-current variable-speed drives, which may be adapted to varied functions.
In the illustrated embodiments, interrelated functions are combined to such an extent that one relatively simple base wiring plate may serve for most desired functions.
wHAr WE; CLAIM IS:
1. A control device for a thyristor-fed d.c. motor, the device comprising:
a housing;
a base wiring plate carried by the housing, the base plate being provided with terminals for receiving external signals and supply voltages, with first and second connector portions of a plug-in type, and with electrical connections between said terminals and connector portion;
a firt printed circuit board carrying a power supply for the device and an electrical connector portion adapted to plug into said first connector portion; and
a second printed circuit board carrying current control circuitry for outputting control signals for thyristors of a d.c. motor, the second board carrying an electrical connector portion adapted to plug into said second connector portion.
2. A device according to claim 1, wherein said current control circuitry comprises a current controller for receiving actual and desired current-proportional signals, an amplifier connected to receive the output signal of the current controller, sawtooth integrators connected to receive synchronising voltages, comparators each connected to receive the output signal of said amplifier and the output signal of a respective one of the sawtooth integrators, and output amplifiers each connected to receive the output signal of a respective one of the comparators and arranged to supply one of said control signals.
3. A device according to claim 2, wherein said power supply is arranged to supply said synchronising voltages.
4. A device according to claim 1, 2 or 3, wherein the base plate is provided with a third connector portion of a plug-in type, said control circuitry includes output stages for outputting control signals to a first thyristor set, and the device further comprises a third printed circuit board carrying output stages for outputting control signals to a second thyristor set, the third board also carrying a control stage for controlling multi-quadrant operation of the control circuitry, and an electrical connector portion adapted to plug into said third connector portion.
5. A device according to any preceding claims, wherein the base plate is provided with another connector portion of a plug-in type, and the device further comprises another printed circuit board carrying circuitry for controlling auxiliary motor functions such as, for example, speed and/or torque control, said other board carrying an electrical connector portion adapted to plug into said other connector portion.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (14)
1. A control device for a thyristor-fed d.c. motor, the device comprising:
a housing;
a base wiring plate carried by the housing, the base plate being provided with terminals for receiving external signals and supply voltages, with first and second connector portions of a plug-in type, and with electrical connections between said terminals and connector portion;
a firt printed circuit board carrying a power supply for the device and an electrical connector portion adapted to plug into said first connector portion; and
a second printed circuit board carrying current control circuitry for outputting control signals for thyristors of a d.c. motor, the second board carrying an electrical connector portion adapted to plug into said second connector portion.
2. A device according to claim 1, wherein said current control circuitry comprises a current controller for receiving actual and desired current-proportional signals, an amplifier connected to receive the output signal of the current controller, sawtooth integrators connected to receive synchronising voltages, comparators each connected to receive the output signal of said amplifier and the output signal of a respective one of the sawtooth integrators, and output amplifiers each connected to receive the output signal of a respective one of the comparators and arranged to supply one of said control signals.
3. A device according to claim 2, wherein said power supply is arranged to supply said synchronising voltages.
4. A device according to claim 1, 2 or 3, wherein the base plate is provided with a third connector portion of a plug-in type, said control circuitry includes output stages for outputting control signals to a first thyristor set, and the device further comprises a third printed circuit board carrying output stages for outputting control signals to a second thyristor set, the third board also carrying a control stage for controlling multi-quadrant operation of the control circuitry, and an electrical connector portion adapted to plug into said third connector portion.
5. A device according to any preceding claims, wherein the base plate is provided with another connector portion of a plug-in type, and the device further comprises another printed circuit board carrying circuitry for controlling auxiliary motor functions such as, for example, speed and/or torque control, said other board carrying an electrical connector portion adapted to plug into said other connector portion.
6. A device according to any preceding
claim, wherein the base plate is provided with a further connector portion of a plugin type, and the device further comprises a further printed circuit board carrying circuitry for protecting the device, said further board carrying an electrical connector portion adapted to plug into said further connector portion.
7. A device according to any preceding claim, wherein the base wiring plate is a printed circuit board.
8. A device according to claim 3, or to any one of claims 4 to 7 as appendant thereto, wherein each of the second and third boards carries additional electrical connector portions of a plug-in type, which portions are arranged to receive plugs of a strip cable leading to the respective thyristor set.
9. A device according to any preceding claim, wherein said first board is disposed adjacent a side wall of said housing.
10. A device according to any preceding claim, wherein said terminals on the base plate are in a terminal block having pins which are soldered onto the base plate.
11. A control device for a thyristor fed d.c. motor, the device being substantially as hereinbefore described with reference to
Figures 1 to 3 of the accompanying drawings.
12. A control device for a thyristor fed d.c. motor, the device being substantially as hereinbefore described with reference to
Figures 1 to 6 of the accompanying drawings.
13. A control device according to any preceding claim, including the thyristors for controlling a d.c. motor.
14. A d.c. motor provided with a control device according to -any preceding claim.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2702968A DE2702968C3 (en) | 1977-01-25 | 1977-01-25 | Control unit for thyristor-fed direct current control drives |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1560319A true GB1560319A (en) | 1980-02-06 |
Family
ID=5999481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB53331/77A Expired GB1560319A (en) | 1977-01-25 | 1977-12-21 | Control device for thyrisor-fed d c motor |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS5393352A (en) |
| BE (1) | BE863243A (en) |
| BR (1) | BR7800406A (en) |
| CH (1) | CH624512A5 (en) |
| DE (1) | DE2702968C3 (en) |
| ES (1) | ES466317A1 (en) |
| FI (1) | FI68748C (en) |
| FR (1) | FR2378399A1 (en) |
| GB (1) | GB1560319A (en) |
| IN (1) | IN149354B (en) |
| IT (1) | IT1092298B (en) |
| NL (1) | NL7800210A (en) |
| SE (1) | SE7800262L (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2478422A1 (en) * | 1980-03-11 | 1981-09-18 | Telecommunications Sa | Moulded plastics case for electronic circuit cards - plugs into mother board and has hinged front and ventilation louvres with card guides |
| DE3125809A1 (en) * | 1981-06-30 | 1983-01-13 | Siemens AG, 1000 Berlin und 8000 München | Housing for accommodating at least one electrical apparatus assembly |
| DE3734864C2 (en) * | 1987-10-14 | 1994-06-09 | Kaltenbach & Voigt | Dental spray handpiece |
| DE3813888A1 (en) * | 1988-04-20 | 1989-11-02 | Schleicher Elektronic Gmbh & C | MODULE FOR A CONTROLLER CONSTRUCTED FROM SEVERAL MODULES SIT ON A CARRIER |
| DE8912879U1 (en) * | 1989-10-31 | 1990-02-08 | C. Fülbier und K. Valicek Conway GmbH, 8000 München | Power supply for connecting electrical or electronic devices |
| DE9000218U1 (en) * | 1990-01-10 | 1990-07-12 | Fuchs Electronic GmbH Entwicklung, Fertigung und Vertrieb von elektronischen Systemen, 77883 Ottenhöfen | Phase control speed controller and regulator with input signal adjustment and galvanic isolation of control signal and output voltage for single-phase operation for resistive and inductive loads through easily replaceable additional board |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2671754A (en) * | 1951-07-21 | 1954-03-09 | Universal Oil Prod Co | Hydrocarbon conversion process providing for the two-stage hydrogenation of sulfur containing oils |
| US3236764A (en) * | 1964-11-27 | 1966-02-22 | Standard Oil Co | Jet fuel manufacture |
| DE1588783B2 (en) * | 1967-09-30 | 1973-02-08 | Siemens AG, 1000 Berlin u 8000 München | DEVICE FOR CONTROLLING A REVERSING CONVERTER |
| DE2320255A1 (en) * | 1973-04-19 | 1974-11-07 | Siemens Ag | INSERTION SYSTEM FOR ELECTRONIC ASSEMBLIES |
-
1977
- 1977-01-25 DE DE2702968A patent/DE2702968C3/en not_active Expired
- 1977-11-23 CH CH1432077A patent/CH624512A5/en not_active IP Right Cessation
- 1977-12-21 GB GB53331/77A patent/GB1560319A/en not_active Expired
-
1978
- 1978-01-02 IN IN06/CAL/78A patent/IN149354B/en unknown
- 1978-01-04 FR FR7800171A patent/FR2378399A1/en active Granted
- 1978-01-06 NL NL7800210A patent/NL7800210A/en not_active Application Discontinuation
- 1978-01-10 SE SE7800262A patent/SE7800262L/en unknown
- 1978-01-18 IT IT19358/78A patent/IT1092298B/en active
- 1978-01-24 BE BE184575A patent/BE863243A/en not_active IP Right Cessation
- 1978-01-24 JP JP664378A patent/JPS5393352A/en active Pending
- 1978-01-24 BR BR7800406A patent/BR7800406A/en unknown
- 1978-01-24 FI FI780217A patent/FI68748C/en not_active IP Right Cessation
- 1978-01-25 ES ES466317A patent/ES466317A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| IN149354B (en) | 1981-11-14 |
| SE7800262L (en) | 1978-07-26 |
| BE863243A (en) | 1978-05-16 |
| FR2378399A1 (en) | 1978-08-18 |
| DE2702968B2 (en) | 1979-07-19 |
| FR2378399B1 (en) | 1983-04-29 |
| FI68748B (en) | 1985-06-28 |
| FI68748C (en) | 1985-10-10 |
| FI780217A (en) | 1978-07-26 |
| NL7800210A (en) | 1978-07-27 |
| DE2702968A1 (en) | 1978-07-27 |
| DE2702968C3 (en) | 1984-04-12 |
| IT1092298B (en) | 1985-07-06 |
| IT7819358A0 (en) | 1978-01-18 |
| ES466317A1 (en) | 1979-01-16 |
| BR7800406A (en) | 1978-09-26 |
| CH624512A5 (en) | 1981-07-31 |
| JPS5393352A (en) | 1978-08-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |