DK169799B1 - Insulation device for electrical coils and transformer windings - Google Patents
Insulation device for electrical coils and transformer windings Download PDFInfo
- Publication number
- DK169799B1 DK169799B1 DK12092A DK12092A DK169799B1 DK 169799 B1 DK169799 B1 DK 169799B1 DK 12092 A DK12092 A DK 12092A DK 12092 A DK12092 A DK 12092A DK 169799 B1 DK169799 B1 DK 169799B1
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- winding
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- sectional profile
- insulation
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/12—Insulating of windings
- H01F41/125—Other insulating structures; Insulating between coil and core, between different winding sections, around the coil
-
- 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
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Insulating Of Coils (AREA)
Description
DK 169799 B1DK 169799 B1
Opfindelsen angår elektriske spoler og transfor-raatorviklinger med hovedsageligt rektangulært viklingstværsnit og omfattende et lag af fleksibel folie, som strækker sig på spolens eller viklingens inderside og 5 endeflader.The invention relates to electric coils and transporter windings having a substantially rectangular winding cross section and comprising a layer of flexible foil extending on the inside and end faces of the coil or winding.
Sådanne i solat ions indretninger benyttes navnlig ved transformator primær- og/eller sekundærviklinger for at skabe en isolationsbarriere mellem netspændingen, f .eks.Such in solat ion devices are used in particular with transformer primary and / or secondary windings to create an insulation barrier between the mains voltage, e.g.
220V, og brugerberørlige dele af elektriske apparater, 10 og af elektricitetsmyndighederne stilles specificerede krav til isolationsegenskaberne for forskellige anvendelsesformål .220V, and user-moving parts of electrical appliances, 10 and of the electricity authorities, specified requirements for the insulation properties for various applications.
For isolationen mellem transformatorens primær- og sekundærviklinger kræves således hyppigt en krybe-15 strømsafstand på mindst 6-8 mm mellem enhver del af primærviklingen og enhver del af sekundærviklingen samt en minimumstykkelse af isolationsbarrieren, som afhængigt af anvendelsen kan variere mellem 0,4 og 1,0 mm.Thus, for the insulation between the primary and secondary windings of the transformer, a creep current spacing of at least 6-8 mm is required between each part of the primary winding and any part of the secondary winding, and a minimum thickness of the insulation barrier which may vary between 0.4 and 1 depending on the application. , 0 mm.
I tilfælde hvor en isolationsbarriere opbygges af flere 20 tyndere lag, stilles normalt krav om, at mindst et lag kan modstå en foreskrevet testspænding.In cases where an insulation barrier is made up of several 20 thinner layers, it is usually required that at least one layer can withstand a prescribed test voltage.
Til opfyldelse af disse krav har traditionelt været benyttet følgende metoder.The following methods have traditionally been used to fulfill these requirements.
1. Placering af viklingerne i koaksial forlængelse 25 af hinanden, f.eks. gennem brug af kammeropdelte spoleforme. Denne metode medfører en for høj spredningsselvinduktion og er ikke anvendelig i forbindelse med højfrekvente impulstransformatorer (switch-mode transformatorer) .1. Placing the coils in coaxial extension 25 of each other, e.g. through the use of chamber divided coil molds. This method results in too high a spreading cell induction and is not applicable in connection with high-frequency switch-mode transformers.
30 2. Koaksial placering af viklingerne uden om hinanden med en mellemliggende trelags isolation, hvor den nødvendige krybeafstand opnås ved vikling på en smallere bredde og afslutning med kanttape eller plastblokke samt ved anvendelse af isolerede tilled-35 ninger. På grund af det ugunstige forhold mellem 2 DK 169799 B1 effektivt kobbertværsnit og isoleringstværsnit er denne metode navnlig uegnet for mindre transformatorer, idet der også her opstår en høj spredningsselvinduktion.2. Coaxial placement of the windings around each other with an intermediate three-layer insulation, where the required creep distance is obtained by winding at a narrower width and ending with edge tape or plastic blocks and by using insulated leads. Due to the disadvantageous ratio of effective copper cross-section to insulation cross-section, this method is particularly unsuitable for smaller transformers, as there is also a high scatter cell evasion here.
3. Indpakning eller bandagering af de enkelte 5 viklinger i trelags tape. Navnlig ved anvendelse af runde spoleforme er denne metode besværlig og giver anledning til stor produktionsusikkerhed, idet der som følge af mangelfuld overlapning af tapebeviklingen kan optræde betydelige lokale variationer eller huller i 10 isolationstykkelsen.3. Wrap or bandage the individual 5 coils into three-layer tape. Especially when using round coils, this method is cumbersome and gives rise to high production uncertainty, as due to insufficient overlap of the tape wrapping, considerable local variations or gaps in the insulation thickness can occur.
4. Anvendelse af specielle spoleforme tilegnet en snæver konkret produktapplikation eller tilsvarende speciel udformning af spoleopbygningen suppleret med indstøbningsteknik. Ud fra økonomiske betragtninger er 15 sådanne metoder kun relevante i forbindelse med større fabrikationsserier, som kan retfærdiggøre de forholdsvis høje værktøjsomkostninger m.v.4. Use of special coil molds dedicated to a narrow concrete product application or equivalent special design of the coil structure supplemented by casting technique. For economic reasons, 15 such methods are only relevant in the case of larger manufacturing series, which can justify the relatively high tool costs, etc.
Fra GB offentliggørelsesskrifterne nr. 2 125 227 og 2 125 228 er det kendt at isolere koncentriske 20 primær- og sekundærviklinger i en transformator fra hinanden ved hjælp af et lag ekstremt strækbart isolationsbånd, som efter bevikling af den i en spoleform anbragte primærvikling vikles på dennes yderside og strækkes således, at dens længdekanter bringes til at 25 dække spoleformens endevægge op over og omkring disses perifere kanter. Strækningen af båndet medfører imidlertid en ukontrollerbar formindskelse af isolationslagtykkelsen, og metoden er ikke egnet til spoleforme med ikke-cirkulært tværsnit, f.eks. firkantede forme 30 eller spoleforme med terminalblokke. Desuden fordrer den en afsluttende indstøbning.From GB Publication Nos. 2 125 227 and 2 125 228, it is known to isolate concentric 20 primary and secondary windings in a transformer by means of a layer of extremely stretchable insulating band which, after winding the primary winding arranged in a coil form, is wound on its exterior and stretched so that its longitudinal edges are brought to cover the coil mold end walls up above and around their peripheral edges. However, the stretching of the tape results in an uncontrollable reduction in the insulation layer thickness, and the method is not suitable for non-circular cross-section coil shapes, e.g. square molds 30 or coil molds with terminal blocks. In addition, it requires a final casting.
På denne baggrund er det formålet for opfindelsen at anvise en ny udformning af en isolationsindretning af den angivne art, som kan benyttes både for kerneløse 35 spoler og transformatorer uafhængigt af transformatorty- 3 DK 169799 B1 pe, og som uden indstøbning tillige kan bruges med og uden anvendelse af spoleform med bevarelse af et gunstigt forhold mellem effektivt kobberareal og isoleret viklingstværsnit og med effektiv kontrol af 5 isolationsbarrierens minimum tykkelse til sikring af opfyldelse af myndighedskrav.In view of the foregoing, it is an object of the invention to provide a new design of an insulating device of the specified type which can be used for both coreless coils and transformers independently of transformer type, and which can also be used with and without embedding and without the use of coil form while maintaining a favorable ratio of effective copper area to insulated winding cross section and with effective control of the minimum thickness of the insulation barrier to ensure compliance with regulatory requirements.
Til opnåelse heraf er en isolationsindretning ifølge opfindelsen ejendommelig ved, at isolationslaget er frembragt af et foliemateriale, som efter at være 10 tildannet i en til den pågældende viklings ydre dimension passende rørform deformeres til et til viklings-tværsnittet passende hovedsageligt U-formet tværsnits-profil. Isolationsindretningens U-formede tværsnitsprofil har endepartier med en sådan bredde, at de rager 15 så meget uden for den tilsigtede viklings tykke Ise, at de ved en efter beviklingen foretaget deformation kan føjes ind over spolens eller viklingens yderside.To achieve this, an insulating device according to the invention is characterized in that the insulating layer is formed of a foil material which, after being formed in a tubular shape suitable for the particular dimension of the winding, is deformed into a substantially U-shaped cross-sectional profile suitable for the winding cross section. . The U-shaped cross-sectional profile of the insulating device has end portions of such width that they protrude so much outside the thick winding of the intended winding that they can be inserted over the outside of the coil or winding upon deformation.
Isolationsindretninger frembragt ifølge opfindelsen kan i princippet benyttes både for kerneløse spoler og 20 for enhver vikling på en transformer af den angivne art, d.v.s. primærviklingen eller sekundærviklingen alene eller begge disse viklinger ligesom den kan benyttes for hver af primær- eller sekundærviklingerne i en transformator med flere primær- og/ eller sekundærviklinger.In principle, insulating devices produced according to the invention can be used both for coreless coils and for any winding on a transformer of the specified kind, i.e. the primary winding or secondary winding alone or both of these winding just as it can be used for each of the primary or secondary windings in a transformer with multiple primary and / or secondary windings.
25 Den frembragte isolationsbarriere er velegnet i forbindelse med viklinger anbragt i såvel standard som specialspoleforme men kan desuden finde anvendelse helt uden spoleform, ved at beviklingen foretages på en specialdorn og bæres af den omsluttende isolations-3 0 barriere.The insulation barrier produced is well suited for windings arranged in both standard and special coil forms, but can additionally be used completely without coil form by winding on a special mandrel and carried by the enclosing insulation barrier.
Med en under hensyn til de aktuelt gældende myndighedskrav fastlagt sammensætning af isolationsmaterialet opnås en høj grad af sikkerhed for vedvarende opfyldelse af krav til krybes trømsaf s tande og mini-35 mumsisolationstykkelse.With a composition of the insulation material determined in accordance with the current regulatory requirements, a high degree of assurance is obtained for the continuous fulfillment of requirements for creep troughs and minimum insulation thickness.
4 DK 169799 B14 DK 169799 B1
Gennem opfindelsen opnås som hovedfordel navnlig en bedre fordeling mellem effektivt kobberareal og isoleret viklingstværsnit, hvilket giver mulighed for reduktion af transformatordimensioneme eller for lavere 5 driftstemperaturer. På grund af muligheden for forøgelse af den effektive spolebredde opnås endvidere som en væsentlig fordel for transformatoren en bedre kobling mellem viklingerne, hvilket navnlig er af betydning for højfrekvente impulstransformatorer af switch-mode typen.The main advantage of the invention is, in particular, a better distribution between effective copper area and insulated winding cross section, which allows for reduction of the transformer dimensions or for lower operating temperatures. Furthermore, owing to the possibility of increasing the effective coil width, a better coupling between the windings is obtained as a major advantage of the transformer, which is particularly important for high-frequency pulse transformer transformers.
10 Opfindelsen giver tillige mulighed for en pro duktionsmæssig lettelse, ved at det i højere grad er muligt at undgå isolerede tilledninger gennem tilstrækkelig omslutning af de enkelte viklinger.The invention also allows for a production relief, in that it is more possible to avoid isolated conduits through sufficient enclosing of the individual windings.
Ved en for praktiske formål velegnet udførelsesform 15 for opfindelsen består isolationsmaterialet af et krympebart materiale, og deformationen til det nævnte U-formede profil foretages ved krympning under varmepåvirkning eller anden fysisk påvirkning. Sådant krympebart materiale kan foreligge i form af et ekstruderet 20 rørformet emne (krympe-flex) eller i form af tape.In a practice suitable for practical purposes 15 of the invention, the insulating material consists of a shrinkable material and the deformation to the said U-shaped profile is made by shrinkage under heat or other physical influence. Such shrinkable material may be in the form of an extruded tubular blank (shrink flex) or in the form of tape.
Opfindelsen forklares i det følgende nærmere under henvisning til den skematiske tegning, hvor fig 1 som udførelsesform for opfindelsen viser en transformator med koncentriske primær- og sekundærvik-25 linger; fig 2-4 illustrerer fremstillingen af en isolationsindretning ifølge opfindelsen; fig 5 og 6 tildanning af et isolationslag i rørform i forbindelse med hhv. en cirkulær og en firkantet 30 spoleform; og fig 7-11 forskellige eksempler på spole- og transformatorviklinger med en isolationsindretning ifølge opfindelsen.The invention is explained in greater detail below with reference to the schematic drawing, in which Fig. 1 shows, as an embodiment of the invention, a transformer with concentric primary and secondary windings; Figures 2-4 illustrate the manufacture of an insulation device according to the invention; Figures 5 and 6 form a tubular insulating layer in connection with respectively. a circular and square 30 coil shape; and FIGS. 7-11 various examples of coil and transformer windings with an insulating device according to the invention.
Ved den i fig 1 viste transformator er primærvik-35 lingen 1 og sekundærviklingen 2 anbragt koaksialt 5 DK 169799 B1 udenom hinanden i en fælles spoleform 3, således at de to vindinger i deres fulde længde overlapper hinanden. Spoleformen 3 omslutter på sin side en j ernkerne 4.In the transformer shown in Fig. 1, the primary winding 1 and the secondary winding 2 are coaxially spaced apart in a common coil shape 3, so that the two turns of their full length overlap each other. The coil shape 3, in turn, encloses the journals 4.
Hver af viklingerne 1 og 2 består på kendt måde 5 af et betydeligt antal vindinger af lakeret kobbertråd viklet på en sådan måde, at hver af viklingerne får et i hovedsagen rektangulært viklings- eller kobbertværsnit .Each of the windings 1 and 2 consists in known manner 5 of a considerable number of coils of lacquered copper wire wound in such a way that each of the windings is given a substantially rectangular winding or copper cross section.
I det viste eksempel er både primærviklingen 1 10 og sekundærviklingen 2 forsynet med en isolationsindretning ifølge opfindelsen i form af isolerende lag 5 og 6, som i det viste eksempel helt dækker den mod kernen 4 vendende inderside af hver vikling, samt viklingens endeflader og tillige er bukket ind over og 15 dækker i det mindste en del af viklingens yderside.In the example shown, both the primary winding 110 and the secondary winding 2 are provided with an insulating device according to the invention in the form of insulating layers 5 and 6, which in the example shown completely cover the inside of the core of each winding, as well as the end faces of the winding and also bent over and 15 covering at least part of the outside of the winding.
Som det fremgår af fig 2-4 frembringes isolationslaget ved, at et lag foliemateriale først tildannes med en rørform 7 passende til yderdimensionen af spoleformen 4's endevægge 8 eller, såfremt der ikke benyttes 20 spoleform, yderdimensionen af selve spolen eller viklingen.As shown in Figures 2-4, the insulating layer is produced by first forming a layer of film material with a tubular shape 7 appropriate to the outer dimension of the end walls 8 of the coil mold 4 or, if no coil shape is used, the outer dimension of the coil or winding itself.
Det i rørform tildannede folielag 7 deformeres herefter til et hovedsageligt U-formet tværsnitsprofil 7a som vist i fig 3, passende til spoleformen 4 25 eller, hvis der ikke benyttes spoleform, til spolens viklings tværsnit. Det U-formede tværsnitsprofil tildannes med endepartier 7b, 7c med en sådan radial bredde, at de rager så meget uden for den tilsigtede viklingstykkelse, at de efter beviklingen kan føjes ind 30 over spolens eller viklingens yderside og dække en væsentlig del af eller eventuelt hele denne side.The tubular film layer 7 is then deformed into a substantially U-shaped cross-sectional profile 7a as shown in Figure 3, suitable for the coil shape 4 25 or, if no coil shape is used, for the coil winding cross section. The U-shaped cross-sectional profile is formed with end portions 7b, 7c of such radial width that they protrude so much outside the intended winding thickness that after winding they can be inserted over the outer surface of the coil or winding and cover a substantial portion or possibly all this side.
Frembringelsen af isolationslaget med rørformen 7 forud for deformationen til det U-formede tværsnitsprofil kan ske ved afskæring fra et i rørform ekstruderet 35 emne af et passende isolationsmateriale, eller som vist 6 DK 169799 B1 i fig 5 og 6 ved en for praktisk produktion mere velegnet metode, ved at spoleformen 10, 10' omvikles med et baneformet isolationsmateriale 9, 9' til dannelse af rørformen 7.The formation of the insulating layer with tubular form 7 prior to deformation to the U-shaped cross sectional profile may be effected by cutting from a tubular extruded workpiece of a suitable insulating material, or as shown in FIGS. method, by wrapping the coil mold 10, 10 'with a web-shaped insulating material 9, 9' to form the tubular mold 7.
5 Ved en til praktisk brug velegnet udførelse er isolationsmaterialet et krympebart materiale, og deformationen til det U-formede tværsnitsprofil foretages ved en krympeproces, fortrinsvis ved en kontrolleret varmepåvirkning.In an embodiment suitable for practical use, the insulating material is a shrinkable material and the deformation to the U-shaped cross sectional profile is carried out by a shrinking process, preferably by a controlled heat effect.
10 Som illustreret i fig 7-11 er der ved brug af isolationsindretninger ifølge opfindelsen i forbindelse med transformere som vist i fig 1 en betydelig valgfrihed med hensyn til isolationsindretningens udformning og anbringelse.10 As illustrated in Figures 7-11, using insulators of the invention in conjunction with transformers as shown in Fig. 1, there is considerable freedom of choice as to the design and arrangement of the insulator.
15 Ved den i fig 7 viste udførelse, som svarer til den i fig 1 viste, er isolationsindretninger 11 og 12 således anbragt både omkring primærviklingen 13 og sekundærviklingen 14 på en sådan måde, at de dækker indersider og endeflader af begge viklinger og tillige 20 dækker en del af viklingernes ydersider.15 In the embodiment shown in FIG. 7, which is similar to that shown in FIG. 1, insulating devices 11 and 12 are thus disposed both around the primary winding 13 and the secondary winding 14 in such a way that they cover the inside and end surfaces of both windings and also 20 cover. part of the outer surfaces of the windings.
I fig 8 og 9 er vist udførelser, hvor hhv. kun primærviklingen 13' og sekundærviklingen 14' har en isolationsindretning, hhv. 11' og 12', udformet på samme måde som i fig 7.Figures 8 and 9 show embodiments in which, respectively. only the primary winding 13 'and the secondary winding 14' have an insulating device, respectively. 11 'and 12', designed in the same manner as in Fig. 7.
25 I fig 10 er vist en udførelsesform, hvor en isolationsindretning 15 omkring en primærvikling 16 fuldstændigt omslutter viklingen også på dennes yderside.Fig. 10 shows an embodiment in which an insulating device 15 around a primary winding 16 completely encloses the winding on the outside thereof.
Endelig er i fig 11 vist en isolationsindretning 30 17 omsluttende en enkelt spolevikling 18.Finally, in Fig. 11, an insulation device 30 17 is shown enclosing a single coil winding 18.
I fig 12 og 13 er vist alternative udførelser, hvor der for hver af de viste primær- og sekundærviklinger 19, 19' henholdsvis 20, 20' tildannes to separate isolationslag ud fra hver sit lag foliemateriale, som 35 er tildannet i rørform som beskrevet i det foregående 7 DK 169799 B1 og derefter deformeret til et hovedsageligt L-formet tværsnit, som dækker en del af viklingens inderside og dens ene endeflade, og hvoraf et endeparti er foldet ind over en del af viklingens yderside.Figures 12 and 13 show alternative embodiments in which for each of the primary and secondary windings 19, 19 'and 20, 20' shown, two separate layers of insulation are formed from each layer of film material, which is formed in tubular form as described in the previous 7 and then deformed into a substantially L-shaped cross-section, which covers part of the inside of the winding and its one end surface, and an end portion of which is folded over part of the outside of the winding.
5 Ved udførelsen i fig 12 er på denne måde for hver af viklingerne 19 og 20 tilvejebragt to separate isolationsindretninger, hhv. 21, 22 og 23, 24, som kun dækker endepartier af viklingerne, medens der i udføreIsesformen i fig 13 for hver af viklingerne 19' 10 og 20' er tilvejebragt to separate isolationsindretninger 25, 26 og 27, 28, som overlapper hinanden på viklingens inderside.In the embodiment of Fig. 12, in this way, for each of the windings 19 and 20, two separate insulation devices, respectively, are provided. 21, 22 and 23, 24, which cover only end portions of the windings, while in the embodiment of Figure 13, for each of the windings 19 '10 and 20', two separate insulation devices 25, 26 and 27, 28 are provided which overlap each other on the winding. inside.
Claims (9)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK12092A DK169799B1 (en) | 1992-01-31 | 1992-01-31 | Insulation device for electrical coils and transformer windings |
| EP93903857A EP0724765B1 (en) | 1992-01-31 | 1993-01-28 | A method of manufacturing an electrical coil or transformer winding having an insulation device |
| DE69313671T DE69313671D1 (en) | 1992-01-31 | 1993-01-28 | METHOD FOR PRODUCING AN ELECTRIC COIL OR TRANSFORMER WINDING WITH AN INSULATING ARRANGEMENT |
| AU34923/93A AU3492393A (en) | 1992-01-31 | 1993-01-28 | An insulation device for electrical coils and transformer windings |
| PCT/DK1993/000031 WO1993015516A1 (en) | 1992-01-31 | 1993-01-28 | An insulation device for electrical coils and transformer windings |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK12092A DK169799B1 (en) | 1992-01-31 | 1992-01-31 | Insulation device for electrical coils and transformer windings |
| DK12092 | 1992-01-31 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK12092D0 DK12092D0 (en) | 1992-01-31 |
| DK12092A DK12092A (en) | 1993-08-01 |
| DK169799B1 true DK169799B1 (en) | 1995-02-27 |
Family
ID=8089978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK12092A DK169799B1 (en) | 1992-01-31 | 1992-01-31 | Insulation device for electrical coils and transformer windings |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0724765B1 (en) |
| AU (1) | AU3492393A (en) |
| DE (1) | DE69313671D1 (en) |
| DK (1) | DK169799B1 (en) |
| WO (1) | WO1993015516A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6326877B1 (en) * | 1999-06-16 | 2001-12-04 | Square D Company | Transformer coil support structure |
| BRPI0706119A2 (en) * | 2007-10-02 | 2009-06-02 | Whirlpool Sa | process of electrical insulation of a coil of an electrical device and arrangement of electrical insulation of a coil of an electrical device |
| ITUB20156089A1 (en) | 2015-12-02 | 2017-06-02 | Itacoil S R L | Insulating tape for electrical components |
| NO20201199A1 (en) * | 2020-11-04 | 2022-05-05 | Seid As | High-voltage transformer for a plasma-based gas-treatment apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8501455D0 (en) * | 1985-01-21 | 1985-02-20 | Gen Electric Co Plc | Electromagnetic transformers |
-
1992
- 1992-01-31 DK DK12092A patent/DK169799B1/en not_active IP Right Cessation
-
1993
- 1993-01-28 EP EP93903857A patent/EP0724765B1/en not_active Expired - Lifetime
- 1993-01-28 DE DE69313671T patent/DE69313671D1/en not_active Expired - Lifetime
- 1993-01-28 WO PCT/DK1993/000031 patent/WO1993015516A1/en active IP Right Grant
- 1993-01-28 AU AU34923/93A patent/AU3492393A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO1993015516A1 (en) | 1993-08-05 |
| DE69313671D1 (en) | 1997-10-09 |
| AU3492393A (en) | 1993-09-01 |
| EP0724765A1 (en) | 1996-08-07 |
| EP0724765B1 (en) | 1997-09-03 |
| DK12092A (en) | 1993-08-01 |
| DK12092D0 (en) | 1992-01-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| B1 | Patent granted (law 1993) | ||
| PBP | Patent lapsed |