GB1591596A - Electrical connector - Google Patents
Electrical connector Download PDFInfo
- Publication number
- GB1591596A GB1591596A GB19074/78A GB1907478A GB1591596A GB 1591596 A GB1591596 A GB 1591596A GB 19074/78 A GB19074/78 A GB 19074/78A GB 1907478 A GB1907478 A GB 1907478A GB 1591596 A GB1591596 A GB 1591596A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cable
- connector
- electrical
- layer
- fitting
- 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
- 239000002184 metal Substances 0.000 claims abstract description 29
- 229910052751 metal Inorganic materials 0.000 claims abstract description 29
- 239000004033 plastic Substances 0.000 claims abstract description 25
- 229920003023 plastic Polymers 0.000 claims abstract description 25
- 238000012216 screening Methods 0.000 claims abstract description 14
- 239000004020 conductor Substances 0.000 claims abstract description 6
- 238000009413 insulation Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 17
- 238000010276 construction Methods 0.000 claims description 7
- 238000010292 electrical insulation Methods 0.000 claims description 5
- 239000003000 extruded plastic Substances 0.000 claims description 2
- 230000005684 electric field Effects 0.000 abstract description 2
- 239000004698 Polyethylene Substances 0.000 abstract 1
- -1 polyethylene Polymers 0.000 abstract 1
- 229920000573 polyethylene Polymers 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 3
- 229920002379 silicone rubber Polymers 0.000 description 3
- 239000004945 silicone rubber Substances 0.000 description 3
- 238000011068 loading method Methods 0.000 description 2
- 239000012858 resilient material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/53—Bases or cases for heavy duty; Bases or cases for high voltage with means for preventing corona or arcing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding
Landscapes
- Cable Accessories (AREA)
- Connector Housings Or Holding Contact Members (AREA)
- Push-Button Switches (AREA)
Abstract
A cable fitting (1), which consists essentially of a metal housing (11) in which an elastic insulating body (13) is arranged, is proposed for connecting a screened heavy-current cable (2) to an electrical apparatus. Arranged in the insulating body are a screening electrode (14) for screening the conductor connection point, and a control deflector (15) for controlling the electrical field in the region of the termination point of the outer conductive layer (5) of the heavy-current cable. A compressible conductive layer (18), which consists of conductive plastic, is located between the elastic insulating body and the metal housing. The fitting is particularly suitable for connecting a medium-voltage cable, which is insulated with polyethylene, to a transformer. <IMAGE>
Description
(54) ELECTRICAL CONNECTOR
(71) We, SIEMENS AKTIENGESELL- 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 electrical connectors and is particularly although not exclusively concerned with connectors for screened heavy-current cables.
Recent development in the field of fittings for electrical cables is aimed at the production of space-saving constructions which can be assembled as rapidly as possible. Such development is concerned both with conventional fittings, such as terminal seals and joint and branch boxes, and to fittings of a particular type, such as those required, for example, for connecting heavy-current cables to electrical apparatus such as, for example, transformers and switching stations.
The development of fittings for the connection of plastics-insulated, screened heavycurrent cables in the medium-voltage range, i.e. in the range from 10 to 30 kV, to electrical apparatus has led to constructions consisting of prefabricated, partly resilient component parts. These constructions are often elbowshaped, in which case an electrically insulated bushing of the electrical apparatus and the conductor of the heavy-current cable are connected together by way of a contact member, which is in some cases surrounded by a screening electrode, and are surrounded by an insulating sheathing having an earthed outer screening. The outer screening may be a metal housing which merges into a metal control deflector and in which a resilient insulating body is embedded (U.S. Patent
Specifications Nos. 3 307 137 and 3 323 097), or it may be a layer of plastics having weak electrical conducting properties, which is applied to a resilient insulating body (German Offenlegungsschrift No. 25 53 135).
However, the latter construction cannot be regarded as completely shock-proof owing to the outer screening consisting of an electrically weakly conducting plastics. On the other hand, known constructions comprising an outer metal housing can have the disadvantage that resilient insulating bodies therein cannot breathe under differing thermal loadings or that changes in volume may result in gaps between electrically charged parts. Attempts have been made to counteract this by using as an insulating body a body having a gentle elastic action, which is placed under pressure by means of a spiral spring (German Offenlegungsschriften Nos.
1765925, 1790290 and 1790292.). However, this involves additional constructional complication, which does not facilitate the assembly of the cable fitting.
It is also known to employ a terminal sealing member consisting of silicone rubber, which is prefabricated for conventional terminal seals of plastics-insulated, screened heavy-current cables and in which there is embedded a resilient control element which comprises a stepped foot portion by which it bears both against an outer conducting layer and against a screen of the cable (German
Gebrauchsmuster No. 7435080). Such terminal sealing members are fitted merely by being pushed on to the correspondingly prepared cable end.
In addition, it is known per se, for cooled, plastics-insulated heavy-current cables having a closed metal sheathing, to dispose between the plastics insulation and the metal sheathing a layer which consists entirely or partially of weakly conducting foamed mate riai, and of which the elastic deformability renders possible an expansion of the volume of the plastics insulation without excessively loading the metal sheathing (German Offenlegungsschrift 2538 133).
According to the present invention, there is provided an electrical connector for a cable having an electrically conductive core, an electrical insulation layer around the core, and an electrically conductive screen around the insulation layer, the connector comprising:
a metal housing;
an elastomeric electrically insulative body within the housing and provided with a passage for said core and insulation layer of a stripped cable secured in the connector;
a compressible layer of plastics material of weak electrical conductivity between the metal housing and said insulative body;
a contact member embedded in said insulative body and formed with a bore for receiving said core of a stripped cable secured in the connector;
a screening electrode, of resilient plastics material of weak electrical conductivity, embedded in said insulative body in the region of said contact member; and
an electrical stress grading element, of resilient plastics material of weak electrical conductivity, embedded in said insulative body at a cable-receiving end thereof, the electrical stress grading element having a stepped portion arranged to bear against and thereby established electrical contact with said screen of a stripped cable secured in the connector.
The compressible layer having weak electrical conductivity advantageously comprises a foamed plastics material. In this case, it is desirable for the compressible layer to be constructed with a so-called integral skin on its boundary face adjoining the said insulative body, that is to say, that face of the compressible layer which directly adjoins the insulative body is made non-porous, i.e.
homogeneous, as far as high voltages are concerned.
Alternatively, the compressible electrically weakly conducting layer may be given the form of a skin which has ribs extending at optionally regular intervals in the peripheral direction and/or in the longitudinal direction, or helically, and bearing against the metal housing. In this case, the cavities present between the ribs take up expansion in the volume of the insulative body and of the cable insulation.
An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawing, in which:
Figure 1 is a longitudinal section of a cable connector; and
Figure 2 is a transverse section on the line A-A in Figure 1.
The fitting 1 illustrated in longitudinal section in Figure 1 and in transverse section in Figure 2 is an elbow-shaped transformer connector consisting substantially of a metal housing 11, an elastomeric electrically insulating body 13 and a contact member 17. The insulating body 13, consisting of a resilient material, for example of silicone rubber, has embedded therein in the elbow-shaped region a screening electrode 14 consisting of a plastics material having weak electrical conductivity, which surrounds pins 8 and 9, of the contact member 17. The end of a plasticsinsulated mediufn voltage cable 2 is introduced into the insulating body 13, for which purpose there is provided an inlet branch 12 which is screwed to the metal housing 11.
The cable 2 has an electrically conducting core 3, a plastics insulating layer 4 around the core 3, an outer electrically conducting layer 5 around the layer 4, an electrically conducting screen 6 around the layer 5, and an outer sheath 7 (of, for example, PVC.)
There is embedded in the insulating body 13 at the cable-receiving end thereof (which is substantially cylindrical) a control deflector 15 consisting of a resilient material having weak electrical conductivity, for example, also consisting of silicone rubber. The control deflector 15 constitutes an electrical grading element or electrical stress relief cone, which controls the electric field where the outer conductive layer 5 terminates. The foot of the deflector is of stepped form in order that it may be able to bear against and thereby establish electrical contract with both the outer conductive layer 5 and against the screen 6 of the medium-voltage cable.
For this purpose, the end of the cable 2 is correspondingly prepared. That is, the plastics insulation 4 is removed from around the end of the conductor 3 to such an extent that the end thereof can be pushed into a bore in the conductor connecting pin 8, the conducting layer 5 is removed in the region of that face of the insulating body 13 which bears against the cable insulation 4, and the screen 6, consisting of copper wires, is bent back onto the cable sheath 7 and is connected to the metal housing 11 after the fitting has been fitted, by means of an appropriate clip, in a manner not particularly illustrated.
Disposed between the insulating body 13 and the metal housing 11 is a compressible plastics layer 18 having weak electrical conductivity, which may be, as is apparent more particularly from Figure 2, either a layer 18 of foamed material (lower half of Figure 2) or a skin-like covering which is provided at regular intervals with ribs 19 extending longitudinally (upper half of Fig. 2). The cavities present in the layer 18 of foamed material, or the cavities 20 present between the ribs 19, take up the changes in volume of the insulating body 13 and of the cable insulation 4 which are produced by heating during operation of the cable fitting. There is also provided between the inlet branch 12 and the insulating body 13 a compressible layer 16 which takes up longitudinal expansions of the insulating body 13 and at the same time performs a sealing function. If desired, the compressible element 16 may also have weak electrical conductivity.
At the transformer end of the fitting 1, a cavity 10 is designed to receive a corresponding transformer bushing. There extends into this space the contact pin 9, which is screwed to the conductor-connecting pin 8. Instead of the illustrated contact element 17, there may be employed contact elements known per se which are of different construction, more particularly plug-in contact elements which are mechanically anchored in the screening electrode 14 and into which that end of the conductor 3 which is provided with a round pin is simply pushed.
It may be appreciated that the illustrated fitting 1 may be built up of prefabricated parts. We have found that the fitting 1 can readily be fitted, because the correspondingly prepared cable end need only be introduced into the metal housing 11 containing the elastomeric insulating body 13, and the screen 6 of the cable only has to be connected to the metal housing 11, and the terminal connecting member 17 only has to be connected to further contact elements. Owing to the use of a metal housing, the fitting can be substantially shock-proof (electrical or mechanical) and owing to the use of the elastomeric control deflector 15, the resilient screening electrode 14 and the compressible conducting layer 18 between the insulating body 13 and the metal housing 11, the fitting is safe against high voltage, the compressible conducting layer 18 simultaneously balancing out expansions in the volume of the insulating body 13 and of the cable insulation 4.
Thus the illustrated embodiment can provide, for screened heavy-current cables having extruded plastics insulation and an outer conducting layer, a fitting for connecting the cable to an electrical apparatus, which fitting is made resistant to high voltage and shockproof, with the use of a prefabricated resilient insulating body.
Although the illustrated housing 11 is generally elbow shaped, it could alternatively be elongate. The illustrated fitting 11 is a terminal connector, but it may be appreciated that it may be modified to provide a line connector for joining together two cables.
The reader's attention is directed to our copending application No. 19075/78 (Serial
No 1591597) which is directed to similar subject-matter.
WHAT WE CLAIM IS:
1. An electrical connector for a cable having an electrically conductive core, an electrical insulation layer around the core, and an electrically conductive screen around the insulation layer, the connector comprising:
a metal housing;
an elastomeric electrically insulative body within the housing and provided with a passage for said core and insulation layer of a stripped cable secured in the connector;
a compressible layer of plastics material of weak electrical conductivity between the metal housing and said insulative body;
a contact member embedded in said insulative body and formed with a bore for receiving said core of a stripped cable secured in the connector;
a screening electrode, of resilient plastics material of weak electrical conductivity, embedded in said insulative body in the region of said contact member; and
an electrical stress grading element, of resilient plastics material of weak electrical conductivity, embedded in said insulative body at a cable-receiving end thereof, the electrical stress grading element having a stepped portion arranged to bear against and thereby establish electrical contact with said screen of a stripped cable secured in the connector.
2. A connector according to claim 1, wherein said compressible layer comprises a foamed plastics material.
3. A connector according to claim 1, wherein said compressible layer comprises a skin of plastics material provided with ribs which bear against said metal housing.
4. A connector according to claim 1, 2 or 3, wherein said housing is substantially elongate.
5. A connector according to claim 1, 2 or 3, wherein said housing is substantially in the form of an elbow.
6. A connector according to claim 1, 2, 3 or 4, being a line connector for connecting together two cables.
7. A connector according to claim 1, 2, 3 or 4, being a terminal connector for connecting a cable to an electrical apparatus.
8. A connector according to any preceding claim, wherein said insulative body is substantially cylindrical around said electrical stress grading element.
9. An electrical connector substantially as hereinbefore described with reference to the accompanying drawing.
10. A connector according to any preceding claim, in combination with a stripped cable secured therein, the cable comprising an electrically conductive core which engages in said bore in said contact member, an electrical insulation layer about said core which layer engages in said passage in said insulative body, and an electrically conductive screen about said insulation layer against which screen said stepped portion of said electrical stress grading element bears.
11. A combination according to claim 10, wherein the cable is a heavy-duty cable and said insulation layer is of plastics.
12. A combination according to claim 10 or 11, wherein the cable has an outer electrically conductive layer which is between said insulation layer and said screen and against which said stepped portion of said electrical stress grading element bears.
13. Electrical apparatus provided with a connector according to claim 7, to claims 7
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (14)
1. An electrical connector for a cable having an electrically conductive core, an electrical insulation layer around the core, and an electrically conductive screen around the insulation layer, the connector comprising:
a metal housing;
an elastomeric electrically insulative body within the housing and provided with a passage for said core and insulation layer of a stripped cable secured in the connector;
a compressible layer of plastics material of weak electrical conductivity between the metal housing and said insulative body;
a contact member embedded in said insulative body and formed with a bore for receiving said core of a stripped cable secured in the connector;
a screening electrode, of resilient plastics material of weak electrical conductivity, embedded in said insulative body in the region of said contact member; and
an electrical stress grading element, of resilient plastics material of weak electrical conductivity, embedded in said insulative body at a cable-receiving end thereof, the electrical stress grading element having a stepped portion arranged to bear against and thereby establish electrical contact with said screen of a stripped cable secured in the connector.
2. A connector according to claim 1, wherein said compressible layer comprises a foamed plastics material.
3. A connector according to claim 1, wherein said compressible layer comprises a skin of plastics material provided with ribs which bear against said metal housing.
4. A connector according to claim 1, 2 or 3, wherein said housing is substantially elongate.
5. A connector according to claim 1, 2 or 3, wherein said housing is substantially in the form of an elbow.
6. A connector according to claim 1, 2, 3 or 4, being a line connector for connecting together two cables.
7. A connector according to claim 1, 2, 3 or 4, being a terminal connector for connecting a cable to an electrical apparatus.
8. A connector according to any preceding claim, wherein said insulative body is substantially cylindrical around said electrical stress grading element.
9. An electrical connector substantially as hereinbefore described with reference to the accompanying drawing.
10. A connector according to any preceding claim, in combination with a stripped cable secured therein, the cable comprising an electrically conductive core which engages in said bore in said contact member, an electrical insulation layer about said core which layer engages in said passage in said insulative body, and an electrically conductive screen about said insulation layer against which screen said stepped portion of said electrical stress grading element bears.
11. A combination according to claim 10, wherein the cable is a heavy-duty cable and said insulation layer is of plastics.
12. A combination according to claim 10 or 11, wherein the cable has an outer electrically conductive layer which is between said insulation layer and said screen and against which said stepped portion of said electrical stress grading element bears.
13. Electrical apparatus provided with a connector according to claim 7, to claims 7
and 8, or to claim 9.
14. Electrical apparatus provided with a combination according to claim 10, 11 or 12 as appendant to claim 7, to claims 7 and 8, or to claim 9.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2726403A DE2726403C3 (en) | 1977-06-09 | 1977-06-09 | Cable set for connecting a shielded power cable to an electrical device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1591596A true GB1591596A (en) | 1981-06-24 |
Family
ID=6011304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19074/78A Expired GB1591596A (en) | 1977-06-09 | 1978-05-11 | Electrical connector |
Country Status (6)
| Country | Link |
|---|---|
| CH (1) | CH626474A5 (en) |
| DE (1) | DE2726403C3 (en) |
| FR (1) | FR2394196A1 (en) |
| GB (1) | GB1591596A (en) |
| IT (1) | IT1095081B (en) |
| SE (1) | SE7806368L (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU691977B2 (en) * | 1994-09-30 | 1998-05-28 | Nexans France | Cable termination |
| US9306340B2 (en) | 2013-12-13 | 2016-04-05 | General Electric Company | System and method for sub-sea cable termination |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2939932A1 (en) * | 1979-09-28 | 1981-04-02 | Siemens AG, 1000 Berlin und 8000 München | PRE-PREPARED ELASTIC SLEEVE BODY FOR PLASTIC-INSULATED SHIELDED POWER CABLES |
| DE2939929C2 (en) * | 1979-09-28 | 1984-08-30 | Siemens AG, 1000 Berlin und 8000 München | Prefabricated sleeve body for connecting a power cable to an electrical device |
| DE2939933C2 (en) * | 1979-09-28 | 1981-09-10 | Siemens AG, 1000 Berlin und 8000 München | Cable set with metallic housing |
| DE2940176C2 (en) * | 1979-10-04 | 1983-03-10 | Krone Gmbh, 1000 Berlin | Metal-encapsulated cable connection device in angled form |
| DE3210223C2 (en) * | 1982-02-01 | 1985-10-17 | Siemens AG, 1000 Berlin und 8000 München | Knee-shaped, pluggable cable set |
| DE3210224C2 (en) * | 1982-03-18 | 1987-01-29 | Siemens AG, 1000 Berlin und 8000 München | Cable set with shield connection |
| DE3210225C2 (en) * | 1982-03-18 | 1987-01-29 | Siemens AG, 1000 Berlin und 8000 München | Pluggable cable set with electrically conductive housing |
| GB2171264B (en) * | 1985-02-15 | 1988-11-23 | Pirelli General Plc | Insulation of electrical terminations |
| DE3538193A1 (en) * | 1985-10-26 | 1987-04-30 | Pfisterer Elektrotech Karl | Plug connecting system for components of medium-voltage and high-voltage power supply networks |
| DE4224673C2 (en) * | 1992-07-25 | 1996-01-25 | Pfisterer Elektrotech Karl | Cable connector |
| DE19509012C2 (en) * | 1995-03-13 | 1997-06-05 | Daetwyler Ag | Plug-in system for connecting medium-voltage or high-voltage cables |
| DE102014105817A1 (en) * | 2014-04-24 | 2015-10-29 | Strescon Gmbh | Kabelendgarnitur |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3243756A (en) * | 1963-04-09 | 1966-03-29 | Elastic Stop Nut Corp | Shielded electrical connection |
| US3323097A (en) * | 1964-08-17 | 1967-05-30 | Mc Graw Edison Co | Conductor termination with stress distribution means |
| US3307137A (en) * | 1965-05-27 | 1967-02-28 | Mc Graw Edison Co | Conductor termination |
| US3466593A (en) * | 1966-11-14 | 1969-09-09 | Gen Electric | Termination |
| DE1790290A1 (en) * | 1967-08-15 | 1973-10-18 | Joslyn Mfg & Supply Co | PLUG-IN, TWO-PIECE CONNECTION DEVICE FOR HIGH VOLTAGE CABLES |
| DE2130525A1 (en) * | 1971-06-16 | 1973-02-15 | Siemens Ag | CABLE SLEEVE FOR POWERFUL CABLE |
| DE2346567C3 (en) * | 1973-09-15 | 1981-04-16 | Felten & Guilleaume Schaltanlagen Gmbh, 4150 Krefeld | Prefabricated silicone rubber cable termination for plastic-insulated power cables |
| DE2422003B2 (en) * | 1974-05-03 | 1979-08-09 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Power cables with extruded plastic insulation and extruded conductive cover layer |
| DE7435080U (en) * | 1974-10-17 | 1975-01-30 | Siemens Ag | End closure with prefabricated insulating body for plastic-insulated power cables |
| US3993387A (en) * | 1974-11-25 | 1976-11-23 | Amerace Corporation | Electrical connector and method of making same |
| DE2538133B2 (en) * | 1975-08-25 | 1981-02-05 | Aeg-Telefunken Kabelwerke Ag, Rheydt, 4050 Moenchengladbach | Cooled single core power cable |
-
1977
- 1977-06-09 DE DE2726403A patent/DE2726403C3/en not_active Expired
-
1978
- 1978-03-22 CH CH314178A patent/CH626474A5/en not_active IP Right Cessation
- 1978-05-11 GB GB19074/78A patent/GB1591596A/en not_active Expired
- 1978-05-31 SE SE7806368A patent/SE7806368L/en unknown
- 1978-06-05 IT IT24208/78A patent/IT1095081B/en active
- 1978-06-05 FR FR787816763A patent/FR2394196A1/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU691977B2 (en) * | 1994-09-30 | 1998-05-28 | Nexans France | Cable termination |
| US9306340B2 (en) | 2013-12-13 | 2016-04-05 | General Electric Company | System and method for sub-sea cable termination |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2394196B1 (en) | 1982-11-12 |
| FR2394196A1 (en) | 1979-01-05 |
| CH626474A5 (en) | 1981-11-13 |
| IT7824208A0 (en) | 1978-06-05 |
| DE2726403A1 (en) | 1978-12-14 |
| DE2726403C3 (en) | 1985-08-08 |
| SE7806368L (en) | 1978-12-10 |
| DE2726403B2 (en) | 1979-11-29 |
| IT1095081B (en) | 1985-08-10 |
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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 |