EP0110645B1 - Improvements in photoprinting lamps - Google Patents
Improvements in photoprinting lamps Download PDFInfo
- Publication number
- EP0110645B1 EP0110645B1 EP19830307089 EP83307089A EP0110645B1 EP 0110645 B1 EP0110645 B1 EP 0110645B1 EP 19830307089 EP19830307089 EP 19830307089 EP 83307089 A EP83307089 A EP 83307089A EP 0110645 B1 EP0110645 B1 EP 0110645B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- arc tube
- volume
- lamp
- per
- reflector
- 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
- 108010001517 Galectin 3 Proteins 0.000 claims description 11
- 102100039558 Galectin-3 Human genes 0.000 claims description 11
- 229910052753 mercury Inorganic materials 0.000 claims description 8
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 6
- 239000010453 quartz Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 229910001507 metal halide Inorganic materials 0.000 description 4
- 150000005309 metal halides Chemical class 0.000 description 4
- 125000000664 diazo group Chemical group [N-]=[N+]=[*] 0.000 description 3
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- DWRNSCDYNYYYHT-UHFFFAOYSA-K gallium(iii) iodide Chemical compound I[Ga](I)I DWRNSCDYNYYYHT-UHFFFAOYSA-K 0.000 description 2
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 2
- BQZGVMWPHXIKEQ-UHFFFAOYSA-L iron(ii) iodide Chemical compound [Fe+2].[I-].[I-] BQZGVMWPHXIKEQ-UHFFFAOYSA-L 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000004694 iodide salts Chemical class 0.000 description 1
- HEJPGFRXUXOTGM-UHFFFAOYSA-K iron(3+);triiodide Chemical compound [Fe+3].[I-].[I-].[I-] HEJPGFRXUXOTGM-UHFFFAOYSA-K 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
- H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
Definitions
- This invention relates to discharge lamps, primarily but not exclusively for the photoprinting industry.
- diazo diazo
- photopolymer printing plates which are then used to transfer ink to the printing paper.
- the former diazo
- the latter requires a lamp having a spectral energy distribution which peaks at approximately 420 nm while the latter material requires a lamp having a spectral energy distribution peaking at approximately 380 nm.
- these different requirements are met by two different lamps each with a fill designed to produce radiation of the desired wavelength.
- a lamp with a fill of 1.3 mg of gallium tri iodide would be used for diazo prints while a lamp with a fill of 2.5 mg of iron iodide would be used for the polymer material, each lamp of course would have the necessary fill of mercury.
- Metal halide lamps having in addition to mercury, a mixture of gallium and ferric iodide are disclosed in the article "A metal halide lamp using both gallium and ferric iodides" by Shunji Kondoh, Lighting Research Laboratory, Lamp and Lighting Division, Storage Battery Co., Kyoto, Japan.
- the lamps disclosed therein are restricted to linear tubular lamps of 1000-5000 watts and arc lengths of between 98 to 200 mm. These lamps require some kind of cooling system because of the heat generated.
- the present invention embraces a discharge arc tube having a basic fill of mercury plus between 0.025 to 1.0 mg Gal3 per cm 3 of the arc tube volume and between 0.1 to 1.0 mg of Fel 2 per cm 3 of the arc tube volume.
- an arc tube of quartz material suitable for a sealed beam reflector photoprinting lamp including spaced electrodes to sustain a discharge therebetween and a fill comprising
- a sealed beam reflector lamp for photoprinting comprising, in combination, a reflector including a dichroic or aluminised layer selected to reflect ultra violet radiation and an arc tube of quartz material, the arc tube including spaced electrodes to sustain a discharge therebetween and a fill comprising
- the outer jacket By providing the outer jacket with a dichroic layer on the inner rear surface thereof and positioning the discharge arc tube near the focus of the reflector, radiation can be diffused through the prismatic window at the front of the reflector and a substantially uniform directionally controlled beam of light is produced.
- the dichroic layer reflects UV radiation and provides for heat dispersal.
- the glass outer jacket affords a high degree of protection from short wave UV radiation.
- the geometry of the discharge arc tube with an electrode length of approximately 25 mm or less and a diameter of 26 mm allows a high wall loading and a hot restart facility. If a hot re-start facility is not required then an aluminised reflector may be substituted for the dichroic layer. This feature combined with a fast run up facility avoids the need to simmer at a reduced power thus achieving reduced running costs when compared with conventional linear sources for photoprinting.
- the reference numeral 10 denotes generally a 800 watt sealed beam reflector lamp combination according to the present invention comprising a reflector 11 containing a metal halide quartz discharge arc tube 12.
- a prismatic lens 13 is sealed to the reflector 11 providing a front window and a dichroic layer 14 is formed on the rear inner surface of the reflector 11.
- the dichroic layer is selected to reflect UV rather than visible light.
- the discharge arc tube 12 is shown in more detail in Figure 2.
- the discharge arc tube 12 is disposed adjacent the focus of the reflector 11 and is carried on nickel alloy inner lead in members 15 and 16 joined to outer lead in members 17 and 18 formed of copper braid.
- a ceramic bridge member 19 maintains the electrically conducting pins 20 and 21 at the correct spacing. This is a standard G38 bi-pin construction providing a hot restart facility.
- the discharge arc tube 12 is shown in more detail. It is seen to comprise a quartz envelope 22 of approximately 10 cm 3 internal volume having a fill 23 selected from a mixture of iron iodide (Fel 2 ), Gallium Tri iodide (Gal3) and mercury (Hg). Tungsten electrode coils 24, 25 are carried on tungsten shanks 26, 27 which are joined respectively to inner molybdenum foils 28 and 29. Outer molybdenum lead-in members 30, 31 are also joined to the foils 28, 29 and hermetically sealed in the pinches 32, 33. A typical electrode length between the electrodes 24 and 25 would be 25 mm with an overall length over the pinch seals of 78 mm while the maximum envelope nominal diameter would be 26 mm. Such an arc tube 12 would then be suitable for a metal halide discharge lamp.
- a quartz envelope 22 of approximately 10 cm 3 internal volume having a fill 23 selected from a mixture of iron iodide (Fel 2 ), Gallium Tri iodide (Gal3) and mercury (
- FIG. 3 there is shown a graph of a Fel 2 -Gal 3 -Hg system according to the invention which indicates a peak irradiance at the particular total iodide dose of 2.5 mg Fel 2 +0.5 mg Gal 3 +50 mg Hg in an approximately 10 cm 3 volume arc tube.
- Other values of relative irradiance at difference dosage rates are given in the following Tables 1 and 2 where all values refer to arc tubes of approximately 10 cm 3 volume.
- lamps having arc tubes of approximately 10 cm 3 volume with a fill of 2.5 mg Fel 2 plus 0.5 mg Gal3 and 65 mg Hg instead of 50 mg were tested and found to have an average irradiance of between 46.2 and 48.5 W/M 2 .
- fills suitable for approximately 10 cm 3 arc tubes comprise a) 0.5 to 0.55 mg Gal3 plus 2.45 to 2.65 mg Fel 2 and 60 to 65 mg Hg and b) 0.5 mg Gal3 plus 2.5 mg Fel 2 and a quantity of mercury selected from between 50 to 65 mg.
Landscapes
- Discharge Lamp (AREA)
Description
- This invention relates to discharge lamps, primarily but not exclusively for the photoprinting industry. In the photoprinting industry there is a requirement to expose diazo and photopolymer printing plates, which are then used to transfer ink to the printing paper. The former (diazo) requires a lamp having a spectral energy distribution which peaks at approximately 420 nm while the latter material requires a lamp having a spectral energy distribution peaking at approximately 380 nm. At the present time these different requirements are met by two different lamps each with a fill designed to produce radiation of the desired wavelength. For example a lamp with a fill of 1.3 mg of gallium tri iodide would be used for diazo prints while a lamp with a fill of 2.5 mg of iron iodide would be used for the polymer material, each lamp of course would have the necessary fill of mercury. Metal halide lamps having in addition to mercury, a mixture of gallium and ferric iodide are disclosed in the article "A metal halide lamp using both gallium and ferric iodides" by Shunji Kondoh, Lighting Research Laboratory, Lamp and Lighting Division, Storage Battery Co., Kyoto, Japan. The lamps disclosed therein are restricted to linear tubular lamps of 1000-5000 watts and arc lengths of between 98 to 200 mm. These lamps require some kind of cooling system because of the heat generated.
- In its broadest aspect the present invention embraces a discharge arc tube having a basic fill of mercury plus between 0.025 to 1.0 mg Gal3 per cm3 of the arc tube volume and between 0.1 to 1.0 mg of Fel2 per cm3 of the arc tube volume.
- According to one aspect of the present invention there is provided an arc tube of quartz material suitable for a sealed beam reflector photoprinting lamp, the arc tube including spaced electrodes to sustain a discharge therebetween and a fill comprising
- from 0.025 to 1.0 mg Gal3 per cm3 of the arc tube volume,
- from 0.1 to 1.0 mg Fel2 per cm3 of the arc tube volume, and
- from 2.5 to 6.5 mg Hg per cm3 of the arc tube volume.
- According to another aspect of the present invention there is provided a sealed beam reflector lamp for photoprinting, the lamp comprising, in combination, a reflector including a dichroic or aluminised layer selected to reflect ultra violet radiation and an arc tube of quartz material, the arc tube including spaced electrodes to sustain a discharge therebetween and a fill comprising
- from 0.025 to 1.0 mg Gal3 per cm3 of the arc tube volume,
- _from 0.1 to 1.0 mg Fel2 per cm3 of the arc tube volume, and
- from 2.5 to 6.5 mg Hg per cm3 of the arc tube volume.
- By providing the outer jacket with a dichroic layer on the inner rear surface thereof and positioning the discharge arc tube near the focus of the reflector, radiation can be diffused through the prismatic window at the front of the reflector and a substantially uniform directionally controlled beam of light is produced. In addition the dichroic layer reflects UV radiation and provides for heat dispersal. Also, the glass outer jacket affords a high degree of protection from short wave UV radiation. The geometry of the discharge arc tube with an electrode length of approximately 25 mm or less and a diameter of 26 mm allows a high wall loading and a hot restart facility. If a hot re-start facility is not required then an aluminised reflector may be substituted for the dichroic layer. This feature combined with a fast run up facility avoids the need to simmer at a reduced power thus achieving reduced running costs when compared with conventional linear sources for photoprinting.
- The invention will now be described by way of example only and with reference to the accompanying drawings wherein:
- Figure 1 shows the combination of a discharge arc tube and sealed beam reflector according to one aspect of the present invention,
- Figure 2 shows in more detail a discharge arc tube according to a further aspect of the present invention, and
- Figure 3 shows a graph of irradiance against total iodide dose in accordance with the present invention.
- In Figure 1, the
reference numeral 10 denotes generally a 800 watt sealed beam reflector lamp combination according to the present invention comprising areflector 11 containing a metal halide quartzdischarge arc tube 12. - A
prismatic lens 13 is sealed to thereflector 11 providing a front window and adichroic layer 14 is formed on the rear inner surface of thereflector 11. The dichroic layer is selected to reflect UV rather than visible light. - The
discharge arc tube 12 is shown in more detail in Figure 2. Thedischarge arc tube 12 is disposed adjacent the focus of thereflector 11 and is carried on nickel alloy inner lead inmembers members ceramic bridge member 19 maintains the electrically conductingpins - In Figure 2 the
discharge arc tube 12 is shown in more detail. It is seen to comprise aquartz envelope 22 of approximately 10 cm3 internal volume having afill 23 selected from a mixture of iron iodide (Fel2), Gallium Tri iodide (Gal3) and mercury (Hg).Tungsten electrode coils tungsten shanks 26, 27 which are joined respectively toinner molybdenum foils members foils pinches electrodes arc tube 12 would then be suitable for a metal halide discharge lamp. - In Figure 3 there is shown a graph of a Fel2-Gal3-Hg system according to the invention which indicates a peak irradiance at the particular total iodide dose of 2.5 mg Fel2+0.5 mg Gal3+50 mg Hg in an approximately 10 cm3 volume arc tube. Other values of relative irradiance at difference dosage rates are given in the following Tables 1 and 2 where all values refer to arc tubes of approximately 10 cm3 volume.
- In Table 2 the mercury content had to be varied in order to achieve the correct volt drop. In all the tests the UV - A and effective response was measured using a "Macam" UV radiometer on a screen positioned 1.0 metre from the source. Readings were taken on a screen 75 cmx50 cm (30"x20") and converted to average W/M2 values.
- In further tests lamps having arc tubes of approximately 10 cm3 volume with a fill of 2.5 mg Fel2 plus 0.5 mg Gal3 and 65 mg Hg instead of 50 mg were tested and found to have an average irradiance of between 46.2 and 48.5 W/M2.
- Further ranges of fills suitable for approximately 10 cm3 arc tubes comprise a) 0.5 to 0.55 mg Gal3 plus 2.45 to 2.65 mg Fel2 and 60 to 65 mg Hg and b) 0.5 mg Gal3 plus 2.5 mg Fel2 and a quantity of mercury selected from between 50 to 65 mg.
- The examples set out hereinbefore are examples of lamps with arc tubes having specific fills, however, it will be clear to the man skilled in the art that variations in the fills and arc tube size could be made. In general the invention can be utilised in a range of fills comprising
- 0.025 to 1.0 mg Gal3 per cm3 of arc tube volume
- 0.1 to 1.0 mg Fe12 per cm3 of arc tube volume
- 2.5 to 6.5 mg per cm3 of arc tube volume.
Claims (7)
1. An arc tube of quartz material suitable for a sealed beam reflector photoprinting lamp, the arc tube including spaced electrodes to sustain a discharge therebetween and a fill comprising
from 0.025 to 1.0 mg Gal3 per cm3 of the arc tube volume,
from 0.1 to 1.0 mg Fel2 per cm3 of the arc tube volume, and
from 2.5 to 6.5 mg Hg per cm3 of the arc tube volume.
2. An arc tube according to Claim 1 wherein the fill comprises 0.5 to 0.55 mg Gal3 plus 2.45 to 2.65 mg Fel2 plus 60 to 65 mg Hg and the arc tube has an internal volume of substantially 10 cm3.
3. An arc tube according to Claim 1 wherein the fill comprises 0.5 mg Gal3 plus 2.5 mg Fel2 and 50 to 65 mg of Hg, the arc tube having an internal volume of substantially 10 cm3.
4. An arc tube according to Claim 3 wherein the mercury content is 50 mg.
5. An arc tube according to any preceding Claim wherein the distance between the electrodes is substantially 25 mm or less and the arc tube internal diameter is 26 mm.
6. A sealed beam reflector lamp for photoprinting, the lamp comprising, in combination, a reflector including a dichroic or aluminised layer selected to reflect ultra violet radiation and an arc tube according to any one of Claims 1 to 5.
7. A sealed beam reflector lamp according to Claim 6 wherein said arc tube is positioned adjacent to the primary focus of the reflector.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8234089 | 1982-11-30 | ||
| GB8234089 | 1982-11-30 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0110645A2 EP0110645A2 (en) | 1984-06-13 |
| EP0110645A3 EP0110645A3 (en) | 1985-05-29 |
| EP0110645B1 true EP0110645B1 (en) | 1988-06-01 |
Family
ID=10534624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19830307089 Expired EP0110645B1 (en) | 1982-11-30 | 1983-11-21 | Improvements in photoprinting lamps |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0110645B1 (en) |
| DE (1) | DE3376922D1 (en) |
| DK (1) | DK548283A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3568512D1 (en) * | 1984-04-19 | 1989-04-06 | Gen Electric | Reflector lamp and lighting systems particularly suitable for architectural lighting |
| NL191812C (en) * | 1987-09-04 | 1996-08-02 | Philips Electronics Nv | High-pressure gas discharge lamp and luminaire fitted with that lamp. |
| GB8725913D0 (en) * | 1987-11-05 | 1987-12-09 | Emi Plc Thorn | Plant growth lamps |
| GB9607129D0 (en) * | 1996-04-04 | 1996-06-12 | Gew Ec Ltd | Uv dryer with improved reflector |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2110663A5 (en) * | 1970-10-26 | 1972-06-02 | Aquitaine Total Organico | |
| GB1397034A (en) * | 1973-07-05 | 1975-06-11 | Thorn Electrical Ind Ltd | Discharge lamps |
| DE2718527A1 (en) * | 1977-04-26 | 1978-11-09 | Patra Patent Treuhand | High pressure discharge lamp with ferrous spectral output - has ferrous halide and mercury containing filling and closely spaced electrodes |
| US4197480A (en) * | 1978-09-11 | 1980-04-08 | Westinghouse Electric Corp. | Reflector-type hid sodium vapor lamp unit with dichroic reflector |
-
1983
- 1983-11-21 EP EP19830307089 patent/EP0110645B1/en not_active Expired
- 1983-11-21 DE DE8383307089T patent/DE3376922D1/en not_active Expired
- 1983-11-30 DK DK548283A patent/DK548283A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0110645A3 (en) | 1985-05-29 |
| DK548283A (en) | 1984-05-31 |
| DE3376922D1 (en) | 1988-07-07 |
| EP0110645A2 (en) | 1984-06-13 |
| DK548283D0 (en) | 1983-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0270004B1 (en) | Gas discharge lamp and apparatus utilizing the same | |
| US4647814A (en) | High-power, high-pressure metal halide discharge lamp with improved spectral light distribution | |
| EP0386601A2 (en) | Reprographic metal halide lamps having long life and maintenance | |
| EP0386602A2 (en) | Reprographic metal halide lamps having high blue emission | |
| US4281267A (en) | High intensity discharge lamp with coating on arc discharge tube | |
| EP0641015B1 (en) | Cadmium discharge lamp | |
| JP2915362B2 (en) | Short arc mercury lamp | |
| JP2817804B2 (en) | Metal halide high pressure discharge lamp | |
| US4418300A (en) | Metal vapor discharge lamp with heat insulator and starting aid | |
| EP0110645B1 (en) | Improvements in photoprinting lamps | |
| GB2165392A (en) | Arc tubes | |
| JP3307291B2 (en) | High pressure mercury discharge lamp | |
| US4622485A (en) | Discharge lamp with neon gas in outer tube | |
| JP4777594B2 (en) | High pressure discharge lamp and lamp unit using the same | |
| JP3399763B2 (en) | Ceramic high-pressure mercury discharge lamp for LCD backlight | |
| US3513344A (en) | High pressure mercury vapor discharge lamp containing lead iodide | |
| US3287587A (en) | High temperature fluorescent lamp with reflector having mercury amalgamative material on its electrode stems | |
| US5136208A (en) | Metal halide lamp maintaining a high lumen maintenance factor over an extended operation period | |
| JP3016061U (en) | High pressure mercury lamp | |
| JP3267153B2 (en) | Metal vapor discharge lamp | |
| JPH0750151A (en) | Excimer discharge lamp | |
| JP2915385B1 (en) | Short arc mercury lamp | |
| JPH11102663A (en) | Metallic vapor discharge lamp and floodlight device | |
| JP2732457B2 (en) | Short arc type mercury vapor discharge lamp | |
| JPH06163008A (en) | Rare gas discharge lamp |
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 |
Designated state(s): DE GB IT |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Designated state(s): DE GB IT |
|
| 17P | Request for examination filed |
Effective date: 19850903 |
|
| 17Q | First examination report despatched |
Effective date: 19870107 |
|
| D17Q | First examination report despatched (deleted) | ||
| ITF | It: translation for a ep patent filed | ||
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE GB IT |
|
| REF | Corresponds to: |
Ref document number: 3376922 Country of ref document: DE Date of ref document: 19880707 |
|
| 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 |
|
| 26N | No opposition filed | ||
| ITTA | It: last paid annual fee | ||
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: 732E |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20021114 Year of fee payment: 20 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20021202 Year of fee payment: 20 |
|
| 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 EXPIRATION OF PROTECTION Effective date: 20031120 |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: PE20 |