EP0281184B1 - Picture display device having means for compensating stray fields - Google Patents
Picture display device having means for compensating stray fields Download PDFInfo
- Publication number
- EP0281184B1 EP0281184B1 EP88200294A EP88200294A EP0281184B1 EP 0281184 B1 EP0281184 B1 EP 0281184B1 EP 88200294 A EP88200294 A EP 88200294A EP 88200294 A EP88200294 A EP 88200294A EP 0281184 B1 EP0281184 B1 EP 0281184B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coils
- display device
- picture display
- coil
- deflection
- 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 - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/70—Arrangements for deflecting ray or beam
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/003—Arrangements for eliminating unwanted electromagnetic effects, e.g. demagnetisation arrangements, shielding coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
- H01J2229/0015—Preventing or cancelling fields leaving the enclosure
Definitions
- the dipole moment of the compensation loop should be parallel to and oppositely directed relative to the dipole moment of the interfering component.
- the interfering component is the line deflection coil in the first place.
- the line output transformer may generate an interference field and can then be considered as an interfering component. In that case it applies that:
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Picture Signal Circuits (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Closed-Circuit Television Systems (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Controls And Circuits For Display Device (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
Description
- The invention relates to a picture display device having a display tube which comprises a cylindrical neck accommodating a device for generating electron beams, a funnel-shaped part which has at its widest end a picture display phosphor screen arranged substantially perpendicular to the longitudinal axis of the tube, electron beam deflection means, and a means for reducing a magnetic stray field originating from one or more sources of the display device.
- Recently more stringent standards have been introduced for certain types of picture display devices, notably for monitors, with respect to the magnetic interference field which they may produce around them. So far protective shields have sometimes been used in picture display devices such as, for example a metal cone envelope for the combination of display tube and deflection unit, but such protective shields are intended to inhibit the influence of external fields on the display device rather than reducing magnetic interference fields generated by the picture display device. An important source of magnetic interference fields is the line deflection coil because it is operated at radio-frequency currents (frequencies in the range of 10 to 100 kHz) as contrasted to the field deflection coil. It is impossible to design a satisfactorily operating deflection coil that produces no stray field. If the stray field were to be eliminated by means of a protective shield, such a shield would only be effective if the combination of display tube and deflection unit were also shielded on the display screen side.
- A picture display device of the type described in the opening paragraph is known from European Patent Application EP-A1-0 179 298. In this application the display tube is surrounded by a number of ring-shaped conductors to eliminate the influence of stray fields from a source or sources of the display device.
- It is an object of the invention to obtain a picture display device of the type described in the opening paragraph having a means for reducing a magnetic stray field of a different design to comply with the regained radiation standards without using shielding means.
- According to the invention, in a picture display device of the type described in the opening paragraph this object is realized in that the electron beam deflection means comprises a deflection unit being mounted on the display tube, which deflection unit comprises a pair of opposite line deflection coils and a field deflection coil, in that the means for educing a stray magnetic field comprises a compensation coil system which is oriented in such manner and is energizable in such manner that in operation a compensating magnetic field is generated by the compensation coil system, the dipole moment of said compensating magnetic field compensating the dipole moment of the magnetic stray field at least to such an extent, that, measured at a predetermined distance from the picture display device, the strength of the local magnetic dipole field generated by the picture display device is below a desired standard, said compensation coil system comprising a first pair of opposite compensation coils (18, 19, 22, 23) arranged on the outer side of the deflection unit opposite to each other relatively to the plane of symmetry of the pair of line deflection coils which is normal to the line deflection field and having side portions which extend in the direction of the longitudinal axis and two further compensation coils arranged on the outer side of the deflection unit symmetrically relative to the said plane of symmetry of the pair of line deflection coils and extending in a plane substantially parallel to the display screen.
- The invention is based on the recognition that for interference suppression of magnetic fields at a long distance from the interfering source (distances of, for example more than 3 m) it is sufficient to compensate the dipole component only. Deflection units also produce higher order (for example sixpole and tenpole) magnetic deflection field components, but their strength decreases much more rapidly as the distance increases than the strength of the dipole component so that their contributions are already negligible at a distance of approximately 50 cm. The magnetic dipole moment of an interfering source (the line deflection coil) can be compensated by adding an opposed dipole moment. This dipole moment can be obtained by energizing two current loops positioned on the outer side of the line deflection coil and extending with two main portions of their lengths at least approximately parallel to the tube axis on facing sides thereof, said current loops having the required number of turns, the required surface area and the required orientation. Energizing may be effected by arranging the compensation coils constituted by the current loops in series with or parallel to the line deflection coil.
- The compensation coils should preferably cover a surface area which is as large as possible. The larger the surface area the less energy will be required to generate a desired magnetic dipole moment. A surface area of, for example 1 to 10 dm² has been found suitable in practice.
- The number of turns of the compensation coils may be small (less than 10). In many cases 2 to 6 turns may suffice. To reduce the interference field at distances of approximately 50 cm the compensation coil system according to the invention comprises two further compensation coils which are arranged on the outer side of the deflection unit symmetrically relative to the plane of symmetry of the line deflection coil and extending parallel to the display screen. During operation they should be energized in the same manner as the first compensation coils.
- As stated hereinbefore, the compensation coils should be large in order to reduce the energy content.
- However, a problem is that many types of display devices (particularly monitors) lack the space to accommodate large coil systems in the correct position. Consequently, relatively shall (too small) compensation coils must be used so that the radiation compensation consumes much (line deflection) energy. The space available for the coils to be arranged parallel to the display screen is mostly too small.
- In a preferred embodiment of the picture display device according to the invention this problem is reduced in that the two further compensation coils each comprise at least two sub-coils arranged in parallel at a predetermined distance. Their effect will be explained hereinafter.
- The coils of the first set of opposite compensation coils may be formed by current loops whose turns are substantially co-planar and extend parallel to the plane of symmetry of the line deflection coil. It is, however, practical to form then as saddle coils which are mounted on the outer side of the electromagnetic deflection unit. Particularly if these saddle coils are of the so-called yoke winding type (i.e. wound on a support) they may be formed in such a manner that their side portions extend in the longitudinal direction of the tube axis, which main portions together with transverse connection portions connecting them at the ends define at least two coil windows of different size. By adjusting the surface areas of the windows (and hence of the total "effective" coil surface) it is possible to adapt the compensating dipole field to the stray field of each line deflection coil with which the first compensation coils are combined.
- It is remarked that from the European Patent Application EP-A1-0 039 502 a picture display device is known having coils to compensate the effect within the display device of electromagnetic fields originating from outside the display device.
- It is remarked that from the United States Patent US-A-4,634,930 a picture display device is known having a single coil arranged below the display tube to cancel electromagnetic noise generated by the deflection yoke.
- It is further remarked that in the European Patent application EP-A1-0 220 777, which is comprised in the prior art falling within the terms of Article 54(3), a picture display device is described having opposite compensation coils. Further compensation coils are, however, not described.
- The invention will now be described in greater detail with reference to the accompanying drawings in which
- Figure 1a is a perspective elevational view of a picture display device with a display tube,
- Figure 1b diagrammatically shows an electromagnetic deflection unit with a line deflection coil;
- Figure 2 is a perspective rear view of a display tube on which two sets of compensation coils have been mounted,
- Figure 3 diagrammatically shows a coil-tube combination in a longitudinal section with two sets of compensation coils;
- Figure 4 is a perspective rear view of a display tube with a set of single and a set of double compensation coils;
- Figure 5 is a diagrammatic plan view of a compensation-coil half with three windows.
- Figure 1a is a perspective elevational view of a combination of a deflection unit and a display tube placed in a cabinet 2 which can be provided with means to compensate interference fields, according to the invention. For the sake of clarity all details which are unimportant for understanding the invention have been omitted.
- The display tube has a cylindrical neck 1 and a funnel-shaped portion 3 the widest part of which is present on the front side of the tube and comprises a display screen (not shown).
- The display screen comprises phosphors which upon impingement by electrons luminesce in a predetermined colour. The rear part of the neck 1 accommodates an electron gun system 7 (shown diagrammatically). At the area of transition between the neck 1 and the funnel-shaped portion 3 an electromagnetic deflection unit 9 diagrammatically shown is arranged on the tube, which unit comprises, inter alia a line deflection coil 11 (Figure 1b) for deflecting the electron beams in a horizontal direction x. As is diagrammatically shown in Figure 1b the
line deflection coil 11 may consist of, for example, two saddle-shaped coil halves. In the operating condition a sawtooth current having a frequency of between 10 and 100 kHz, for example a frequency of approximately 6 kHz flows through these coils. Generally theline deflection coil 11 is surrounded by anannular core element 10 of soft magnetic material, the so-called yoke ring, which is shown in a broken line in Figure 1b. - When the radiation field of a line deflection coil having a yoke ring is initially equally large but opposed to that of a coil without a yoke ring, the line deflection coil can be assumed for large distances to be a current loop having a given magnetic moment.
- The field Bo in the centre of a line deflection coil without a yoke ring can be calculated to be approximately 3,0 mT (30 Gauss). The field of a practical deflection coil with a yoke ring has approximately twice this value.
- The line deflection coil field at 1 m distance is approximately 10 »T (1 m Gauss).
- This radiation field can be compensated by means of an auxiliary loop current having a low nI value and a large radius such that the magnetic moment is the same as that of the coil itself. Such an auxiliary loop current can be generated by means of a compensation loop having a radius Rc = 20 cm and with a number of turns nc = 4. In this manner a reduction of 40 dB can be realized, for example at a distance of 3 m and more from the radiation source. The orientation of the compensation loop should be such that the magnetic dipole moment generated upon current passage through this coil at a predetermined distance (for example 3 m) compensates the magnetic dipole moment of the interfering component. To this end the dipole moment of the compensation loop should be parallel to and oppositely directed relative to the dipole moment of the interfering component. The interfering component is the line deflection coil in the first place. However, also the line output transformer may generate an interference field and can then be considered as an interfering component. In that case it applies that:
- Parallel dipole moments originating from one or more components can be compensated with one current loop. Non-parallel dipole moments can be compensated with one loop when the frequency and the phase of the dipole moments to be compensated are the same.
- Thus it is possible to compensate the magnetic stray fields of a device comprising a number of directly interfering sources (line output stage, deflection coil) and a number of indirect sources ("reflectors", base plates) with the aid of a compensation loop having a limited number of turns and a given diameter.
- By choosing the number of turns to be low and the surface area to be large the following conditions can always be satisfied:
- 1. The magnetic dipole moment vector is equal to the sum of the dipole moments of all direct sources in the device.
- 2. The load on the supply and the interference on the components in the device itself, notably the deflection coil, is sufficiently small.
- Figure 2 shows a deflection unit having two sets of interference coils, a horizontally arranged set 18, 19 and a vertically arranged
set - The operation of the coil arrangement of Figure 2 will now be explained with reference to Figure 3. The interfering field of the
deflection coil 26 can be roughly assumed to be a dipole in the tube 27 (= coil 21). Compensation is effected by means of thecoils deflection unit 26. However, due to the distance ΔY₁ between thecoils 22 and 23 a 6-pole component is produced and due to the distance ΔX a 4-pole component is produced. If thecoils coils vertical coils - As already noted hereinbefore, it is important to have big-sized interference suppression coils in connection with their energy consumption. If this is not possible the invention provides the solution of building up the coils of the system arranged at right angles to the plane of symmetry of the line deflection coil from at least two sub-coils (28a and 28b and 29a and 29b, respectively in Figure 4). By arranging the sub-coils of each pair at a predetermined distance (ΔZ) from each other, it can be ensured that there is a minimum mutual inductance. In the case of two sub-coils, each sub-coil pair may have half the number of turns which would otherwise be required for a single coil. This means that the inductance of the system with two pairs of sub-coils may be half the inductance of a set of single coils. This results in a reduction of the energy content.
- The saddle coils 18, 19 may be of the so-called yoke winding type. This means that they are directly wound on a support. This support may comprise, for example two grooved flanges which are secured to the front and rear sides of the deflection unit. The positions of the axially extending turn portions can be fixed by means of the grooves. For use in different deflection units, for example universal flanges (with grooves uniformly distributed over the circumference) can be used to wind compensation coils having two or more coil windows of different size. In this manner the "effective" compensation coil surface area can be adapted to each line deflection coil with which the compensation coil is combined. Figure 5 is a diagrammatic plan view of a compensation
saddle coil half 30 having threecoil windows
Claims (5)
- A picture display device having a display tube which comprises a cylindrical neck (1) accommodating a device for generating electron beams (7), a funnel-shaped part (3) which has at its widest end a picture display phosphor screen arranged substantially perpendicular to the longitudinal axis of the tube, electron beam deflection means, and a means for reducing a magnetic stray field originating from one or more sources of the display device, characterized in that the electron beam deflection means comprises a deflection unit (9) being mounted on the display tube, which deflection unit comprises a pair of opposite line deflection coils (11) and a field deflection coil, in that the means for reducing a stray magnetic field comprises a compensation coil system which is oriented in such manner and is energizable in such manner that in operation a compensating magnetic field is generated by the compensation coil system, the dipole moment of said compensating magnetic field compensating the dipole moment of the magnetic stray field at least to such an extent, that, measured at a predetermined distance from the picture display device, the strength of the local magnetic dipole field generated by the picture display device is below a desired standard, said compensation coil system comprising a first pair of compensation coils (18, 19, 22, 23) arranged on the outer side of the deflection unit opposite to each other relatively to the plane of symmetry of the pair of line deflection coils which is normal to the line deflection field and having side portions which extend in the direction of the longitudinal axis (z) and two further compensation coils (18a, 19a, 24, 25, 28a, 28b, 29a, 29b) arranged on the outer side of the deflection unit symmetrically relative to the said plane of symmetry of the pair of line deflection coils and extending in a plane substantially parallel to the display screen.
- A picture display device as claimed to claim 1, characterized in that the two further compensation coils each comprise at least two sub-coils (28a,28b,29a,29b) arranged in parallel at a predetermined distance (ΔZ).
- A picture display device as claimed in claim 1 or 2, characterized in that the coils of the first set of opposite compensation coils are each formed as a saddle-type coil mounted on the outer side of the deflection unit.
- A picture display device as claimed in claim 3, characterized in that the saddle-type coils are each positioned on the outer side of the electromagnetic deflection unit and have side portions extending in the direction of the longitudinal tube axis, said side portions together with transverse connection parts connecting them at the defining at least two coil windows of different size.
- A picture display device as claimed in claim 4, characterized in that the saddle-type coils are of the yoke winding type.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8700449A NL8700449A (en) | 1987-02-24 | 1987-02-24 | IMAGE DISPLAY DEVICE WITH MEANS FOR COMPENSATING LINE SPRAY FIELDS. |
NL8700449 | 1987-02-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0281184A1 EP0281184A1 (en) | 1988-09-07 |
EP0281184B1 true EP0281184B1 (en) | 1994-07-20 |
Family
ID=19849617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88200294A Expired - Lifetime EP0281184B1 (en) | 1987-02-24 | 1988-02-18 | Picture display device having means for compensating stray fields |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0281184B1 (en) |
JP (1) | JP2677585B2 (en) |
KR (1) | KR960000348B1 (en) |
AT (1) | ATE108947T1 (en) |
DE (1) | DE3850687T2 (en) |
NL (1) | NL8700449A (en) |
NO (1) | NO880765L (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0646142Y2 (en) * | 1989-04-28 | 1994-11-24 | 日本ビクター株式会社 | Leakage magnetic flux reduction device |
US5959392A (en) * | 1995-01-24 | 1999-09-28 | International Business Machines Corporation | Cancellation coil arrangement for reducing stray magnetic field emissions from CRT displays |
EP1790981A1 (en) | 2005-11-28 | 2007-05-30 | Siemens Aktiengesellschaft | Apparatus and method for maintenance of a device in a flow channel |
KR20190064899A (en) | 2017-12-01 | 2019-06-11 | 주식회사 에이치케이 | Apparatus for changing working table |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0220777A1 (en) * | 1985-10-25 | 1987-05-06 | Koninklijke Philips Electronics N.V. | Picture display device with interference suppression means |
EP0235863A1 (en) * | 1986-03-07 | 1987-09-09 | Philips Norden AB | A method of, and device for, reducing magnetic stray fields of a cathod ray tube |
EP0245711A2 (en) * | 1986-05-14 | 1987-11-19 | Mitsubishi Denki Kabushiki Kaisha | Deflecting yoke |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3017331A1 (en) * | 1980-05-06 | 1981-11-12 | Siemens AG, 1000 Berlin und 8000 München | ARRANGEMENT FOR COMPENSATING FOR MAGNETIC FOREIGN INTERFERENCE ON COLOR TV TELEVISIONS |
JPS60218693A (en) * | 1984-04-13 | 1985-11-01 | 三菱電機株式会社 | Display unit |
DK29385A (en) * | 1984-10-09 | 1986-04-10 | Viggo Berthelsen | PROCEDURE AND APPARATUS FOR ELIMINATING THE POWER FROM A MAGNET FIELD AND PROTECTION AGAINST THE SAME |
SE452077C (en) * | 1986-03-04 | 1992-12-07 | Blixt Autovision | DEVICE TO REDUCE UNWANTED LEAKFIELD ACTIVITIES IN FRONT OF CATHEDRAL TUBE SCREEN |
IN167955B (en) * | 1986-03-27 | 1991-01-12 | Nokia Data Systems |
-
1987
- 1987-02-24 NL NL8700449A patent/NL8700449A/en not_active Application Discontinuation
-
1988
- 1988-02-18 AT AT88200294T patent/ATE108947T1/en not_active IP Right Cessation
- 1988-02-18 DE DE3850687T patent/DE3850687T2/en not_active Expired - Fee Related
- 1988-02-18 EP EP88200294A patent/EP0281184B1/en not_active Expired - Lifetime
- 1988-02-22 JP JP63039342A patent/JP2677585B2/en not_active Expired - Fee Related
- 1988-02-22 KR KR1019880001802A patent/KR960000348B1/en not_active IP Right Cessation
- 1988-02-22 NO NO880765A patent/NO880765L/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0220777A1 (en) * | 1985-10-25 | 1987-05-06 | Koninklijke Philips Electronics N.V. | Picture display device with interference suppression means |
EP0235863A1 (en) * | 1986-03-07 | 1987-09-09 | Philips Norden AB | A method of, and device for, reducing magnetic stray fields of a cathod ray tube |
EP0245711A2 (en) * | 1986-05-14 | 1987-11-19 | Mitsubishi Denki Kabushiki Kaisha | Deflecting yoke |
Also Published As
Publication number | Publication date |
---|---|
KR880010464A (en) | 1988-10-08 |
JPS63227186A (en) | 1988-09-21 |
NL8700449A (en) | 1988-09-16 |
JP2677585B2 (en) | 1997-11-17 |
NO880765L (en) | 1988-08-25 |
ATE108947T1 (en) | 1994-08-15 |
DE3850687T2 (en) | 1995-02-16 |
KR960000348B1 (en) | 1996-01-05 |
DE3850687D1 (en) | 1994-08-25 |
EP0281184A1 (en) | 1988-09-07 |
NO880765D0 (en) | 1988-02-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4947083A (en) | Picture display device with interference suppression means | |
JP2781207B2 (en) | Image display device | |
EP0291121B1 (en) | Picture display device with stray field compensation means | |
US4992697A (en) | Picture display device with magnetizable core means comprising compensation coils | |
US4922167A (en) | Picture display device having means for compensating line stray fields | |
EP0281184B1 (en) | Picture display device having means for compensating stray fields | |
US4943753A (en) | Magnetic shunt for deflection yokes | |
EP0487796B1 (en) | Cathode ray tube display | |
US5432492A (en) | Deflection yoke apparatus with auxiliar coils to compensensate magnetic leakage | |
EP0349098A1 (en) | Cathode ray tube display monitor with stray magnetic field compensation | |
EP0540096B1 (en) | Deflection yoke apparatus with means for reducing leaking magnetic fields | |
KR930010777B1 (en) | Disconvergence correcting apparatus | |
JP2930631B2 (en) | Deflection yoke | |
JPS6376245A (en) | Deflecting yoke | |
AU623227B2 (en) | Magnetic shunt for deflection yokes | |
JPH01154442A (en) | Cathode-ray tube display device | |
JPH01154441A (en) | Deflection yoke device | |
NL8800235A (en) | Picture display device with magnetisable core - has compensation coil system with core of magnetisable material positioned between display screen and deflection unit | |
JPH07211267A (en) | Cathode-ray tube | |
JPH0638327B2 (en) | Deflection-yoke device | |
NL8802802A (en) | Picture display device with compensation coils - has two coils wound on rod-shaped core portion arranged in v formation |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT DE FR GB IT NL SE |
|
17P | Request for examination filed |
Effective date: 19890302 |
|
17Q | First examination report despatched |
Effective date: 19910128 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT DE FR GB IT NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT Effective date: 19940720 Ref country code: AT Effective date: 19940720 Ref country code: NL Effective date: 19940720 |
|
REF | Corresponds to: |
Ref document number: 108947 Country of ref document: AT Date of ref document: 19940815 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 3850687 Country of ref document: DE Date of ref document: 19940825 |
|
ET | Fr: translation filed | ||
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
EAL | Se: european patent in force in sweden |
Ref document number: 88200294.2 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: CD |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19970225 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19970422 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19980202 Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19980217 Year of fee payment: 11 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980219 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: CD |
|
EUG | Se: european patent has lapsed |
Ref document number: 88200294.2 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19981103 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990218 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19990218 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19991029 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |