GB2155357A - Optical fibres - Google Patents
Optical fibres Download PDFInfo
- Publication number
- GB2155357A GB2155357A GB08406320A GB8406320A GB2155357A GB 2155357 A GB2155357 A GB 2155357A GB 08406320 A GB08406320 A GB 08406320A GB 8406320 A GB8406320 A GB 8406320A GB 2155357 A GB2155357 A GB 2155357A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fibre
- coating layer
- coating
- radiation
- radiation source
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title description 5
- 230000005855 radiation Effects 0.000 claims abstract description 40
- 238000000576 coating method Methods 0.000 claims abstract description 39
- 239000000835 fiber Substances 0.000 claims abstract description 37
- 239000011248 coating agent Substances 0.000 claims abstract description 34
- 239000013307 optical fiber Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 16
- 239000011247 coating layer Substances 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 238000005229 chemical vapour deposition Methods 0.000 claims description 2
- 229920003203 poly(dimethylsilylene-co-phenylmethyl- silylene) polymer Polymers 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims 3
- 230000008021 deposition Effects 0.000 claims 3
- 238000010438 heat treatment Methods 0.000 claims 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 claims 1
- 230000000704 physical effect Effects 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000005137 deposition process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 238000007380 fibre production Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/12—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves
- B01J19/121—Coherent waves, e.g. laser beams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/12—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves
- B01J19/122—Incoherent waves
- B01J19/123—Ultraviolet light
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/10—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation for articles of indefinite length
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/12—General methods of coating; Devices therefor
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02395—Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0827—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0838—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using laser
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0075—Light guides, optical cables
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Thermal Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Abstract
A coating which varies in properties along the length of an optical fibre is provided by passing the fibre through a radiation zone produced by a radiation source, for example, a laser or uv-lamp. By modulation of the radiation source, for example switching it on and off, the properties of the coating on the optical fibre can be correspondingly modulated. The coating properties concerned include coating thickness, coating structure and physical properties.
Description
SPECIFICATION
Optical fibres
This invention relates to optical fibres and in particular to the provision of coatings thereon.
According to the present invention there is provided a method of providing an optical fibre with a coating which is modulated along the length of the fibre, including the step of modulating a radiation source whilst passing the fibre through a radiation zone associated with the source, which radiation source modulation serves to produce a corresponding variation in a property of a coating layer disposed on the fibre.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 illustrates, schematically, one basic arrangement for coating an optical fibre, and
Figure 2 illustrates, schematically, another basic arrangement for coating an optical fibre.
Primary coatings are applied to optical fibres to increase hermeticity, increase strength and produce special properties which enable the fibres to be used as sensors. Coatings may be chosen from a wide range of materials including polymers, metals and ceramics and may be applied by a variety of techniques including dip coating, sputtering and chemical vapour deposition. Although in most cases the need is for a uniform coating, there are applications where it is desirable to modulate the coating along the length of the fibre. Examples of such modulation include variable coating thickness, variable coating structure and variable physical properties.
The basic features of one embodiment of method of coating of the present invention are illustrated in Fig. 1. An optical fibre 1, which may be bare or precoated, is directed along a path such that it passes through a radiation zone 2 produced by a radiation source, 2a shown only schematically, such as a laser or an ultraviolet lamp, which provides radiation that heats only the fibre, and/or any coating thereon, and not the surrounding atmosphere and which can be modulated, for example, rapidly switched on and off or changed in output rapidly and in a controlled fashion.
The fibre 1 may be drawn from a preform 3 in a conventional manner, or produced otherwise, and coated in a primary coating unit 4 in line therewith prior to passage through the radiation zone and subsequent taking-up on a spool 5. In the primary coating unit a continuous, uniform coating of any material may be applied by any suitable means.
The radiation zone is then used to locally heat the fibre and the coating and to modify the coating by introducing a phase transformation and if required by fusing the coating to the fibre. The radiation source is switched on and off, or modulated in intensity, so as to change the temperature of the fibre and thereby the extent of the phase transformation in the coating. The coating may, for example, be a crystalline metallic alloy, which upon passage through the radiation zone is converted to a glassy phase. By modulating the radiation source and thus the radiation zone a coating may be produced which varies between glassy and crystalline along the length of the fibre and therefore has an accompanying variation of magnetic properties. As a second example, the coating may comprise an uncured or partially cured polymer. By modulating the radiation source and thus the radiation zone, the state of cure and hence the mechanical properties of the coating may be varied in a controlled fashion along the length of the fibre.
A large number of metals and ceramics may be deposited at low temperatures either by decomposing a suitable vapour or by reacting one or more vapours. Examples of these are the decomposition of metal carbonyls to produce elemental metals, and the reaction of silane with ammonia to produce silicon nitride. If a heated fibre is passed through the reactant gases the deposition process may be nucleated at the fibre surface. Use of a radiation source such as a laser will ensure that the fibre alone will be heated and therefore that no decomposition or reaction will occur in the atmosphere or at the walls of the reaction vessel. Figure 2 illustrates a schematic arrangement for such a coating by deposition process.
A bare fibre 6 freshly drawn from a preform 7, or produced otherwise, is passed through a reaction chamber 8 into which are introduced the required reactant gases. Within the chamber 8 the fibre 6 is heated by a laser or other radiation source 9. By switching the radiation source on and off, or by varying its intensity, a modulated coating may be obtained along the fibre length. The radiation source 9 is indicated as disposed externally of the reaction chamber 8 and the radiation therefrom directed onto the fibre within the chamber by means of reflection from a mirror 10 and the internal walls of the chamber 8. The coated fibre 11 is taken up as a spool 12.
A wide variety of polymer coatings can be applied to optical fibres as prepolymer resins, the films subsequently being exposed to radiation (heat or ultra-violet light) to initiate cross-linking, the degree of cross-linking being determined, up to a saturation value, by the total incident energy. If a precoated and cured fibre is passed through or otherwise coated with a prepolymer whereby to obtain an additional layer, and if a radiation source employed to cure the additional layer is switched on and off, the additional layer will be subjected to spatially modulated cross-linking. The uncured portion of the additional coating can subsequently be removed, leaving a coating of modulated thickness.
Alternatively, if a fibre is coated with a material, applied from a melt, which has a stable cross-link density C1, but that with u.v. irradiation the crosslink density increases to C2 thereby altering the physical and chemical characteristics of the material, then by switching on and off or otherwise modulating a u.v. radiation source (lamp or laser) a fibre with a uniform thickness film of periodically varying modulus, stiffness or thermal expansion coefficient can be obtained. An example of such a polymer is polysilastyrene.
The coating methods described above involve the use of a radiation source, such as a laser or ultra-violet lamp, which is modulated during use, by being switched on and off or by having its output changed rapidly, whereby to produce a modulated coating on an optical fibre. The methods can be carried out on-line during fibre production, thereby avoiding problems of fibre contamination as a result of an intermediate handling process.
Claims (11)
1. A method of providing an optical fibre with a coating which is modulated along the length of the fibre, including the step of modulating a radiation source whilst passing the fibre through a radiation zone associated with the source, which radiation source modulation serves to produce a corresponding variation in a property of a coating layer disposed on the fibre.
2. A method as claimed in claim 1, wherein the coating layer is applied to the fibre before passage through the radiation zone.
3. A method as claimed in claim 2, wherein the radiation source comprises a laser source modulation of which serves to cause local heating of the coating layer at corresponding intervals along the length of the fibre, whereby to induce corresponding varying properties therein.
4. A method as claimed in claim 2, wherein the coating layer is uncurable and uncured prior to the passage through the radiation zone, the radiation source comprising a uv lamp modulation of which serves to produce variable curing of the coating layer along the length of the fibre.
5. A method as claimed in claim 4, wherein said coating layer is disposed on a cured coating layer and including the step of removing uncured portions of said coating layer whereby to achieve a coating of thickness which varies along the length of the fibre.
6. A method as claimed in claim 2, wherein the coating layer is of a material which has a cross-link density with a first value upon appiication, which cross-link density can be increased to a second value by means of uv irradiation, and wherein the radiation source comprises a uv lamp or laser.
7. A method as claimed in claim 6, wherein the coating layer is comprised of polysilastyrene.
8. A method as claimed in claim 1, wherein the coating layer is applied in a reaction furnace by chemical vapour deposition, the radiation zone being within the furnace and the fibre being heated by the radiation source to a temperature sufficient to achieve deposition of the coating layer thereon, the modulation of the radiation source causing corresponding varying deposition along the length of the fibre.
9. A method as claimed in claim 8, wherein the radiation source comprises a laser source disposed externally of the reaction furnace, radiation from the laser source being directed to the radiation zone by reflection from a mirror and/or surfaces of the furnace whereby the fibre alone is heated and deposition occurs only on the fibre.
10. A method of providing an optical fibre with a coating which is modulated along the length of the fibre substantially as herein described with reference to and as illustrated in Fig. 1 or Fig. 2 of the accompanying drawings.
11. An optical fibre with a coating which is modulated along the length of the fibre manufactured by a method as claimed in any one of the preceding claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08406320A GB2155357B (en) | 1984-03-10 | 1984-03-10 | Optical fibres |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08406320A GB2155357B (en) | 1984-03-10 | 1984-03-10 | Optical fibres |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8406320D0 GB8406320D0 (en) | 1984-04-11 |
| GB2155357A true GB2155357A (en) | 1985-09-25 |
| GB2155357B GB2155357B (en) | 1987-09-09 |
Family
ID=10557884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08406320A Expired GB2155357B (en) | 1984-03-10 | 1984-03-10 | Optical fibres |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2155357B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2203757A (en) * | 1987-04-16 | 1988-10-26 | Philips Electronic Associated | Deposition of alternate cdte and hgte layers in electronic device manufacture |
| GB2212819A (en) * | 1987-11-30 | 1989-08-02 | Gen Electric | Laser chemical vapor deposition |
| GB2241711A (en) * | 1990-03-05 | 1991-09-11 | Northrop Corp | Continuous open chemical vapour deposition |
| FR2663754A1 (en) * | 1990-06-26 | 1991-12-27 | Alsthom Cge Alcatel | METHOD FOR MANUFACTURING AN OPTICAL FIBER INTENDED IN PARTICULAR FOR TEMPORAL REFLECTOMETRY AND OPTICAL FIBER OBTAINED BY THIS PROCESS. |
| WO1997037951A1 (en) * | 1996-04-10 | 1997-10-16 | Dsm N.V. | A method of increasing the adhesion between radiation-cured, inner primary coatings and optical glass fibers |
| GB2316019A (en) * | 1996-08-07 | 1998-02-18 | Siemens Ag | Coating an electrical and/or optical conductor with resin |
| FR2765346A1 (en) * | 1997-06-26 | 1998-12-31 | Alsthom Cge Alcatel | METHOD FOR MANUFACTURING AN OPTICAL CONDUCTOR |
| WO2009015825A2 (en) * | 2007-07-28 | 2009-02-05 | Leoni Bordnetz-Systeme Gmbh | Process and apparatus for the production of an elastomeric optical conductor fibre, and optical conductor fibre |
-
1984
- 1984-03-10 GB GB08406320A patent/GB2155357B/en not_active Expired
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4874634A (en) * | 1987-04-16 | 1989-10-17 | U.S. Philips Corp. | Vapor phase deposition of cadmium and mercury telluride for electronic device manufacture |
| GB2203757B (en) * | 1987-04-16 | 1991-05-22 | Philips Electronic Associated | Electronic device manufacture |
| GB2203757A (en) * | 1987-04-16 | 1988-10-26 | Philips Electronic Associated | Deposition of alternate cdte and hgte layers in electronic device manufacture |
| GB2212819A (en) * | 1987-11-30 | 1989-08-02 | Gen Electric | Laser chemical vapor deposition |
| GB2241711A (en) * | 1990-03-05 | 1991-09-11 | Northrop Corp | Continuous open chemical vapour deposition |
| GB2241711B (en) * | 1990-03-05 | 1993-09-22 | Northrop Corp | Method and apparatus for carbon coating and boron-doped carbon coating |
| FR2663754A1 (en) * | 1990-06-26 | 1991-12-27 | Alsthom Cge Alcatel | METHOD FOR MANUFACTURING AN OPTICAL FIBER INTENDED IN PARTICULAR FOR TEMPORAL REFLECTOMETRY AND OPTICAL FIBER OBTAINED BY THIS PROCESS. |
| EP0464568A1 (en) * | 1990-06-26 | 1992-01-08 | Alcatel Fibres Optiques | Method of manufacturing an optical fibre, especially for the time-domain reflectometry |
| US5151966A (en) * | 1990-06-26 | 1992-09-29 | Alcatel Fibres Optiques | Optical fiber suitable for use in optical time domain reflectometry and method of manufacturing it |
| AU709457B2 (en) * | 1996-04-10 | 1999-08-26 | Dsm N.V. | A method of increasing the adhesion between radiation-cured, inner primary coatings and optical glass fibers |
| WO1997037951A1 (en) * | 1996-04-10 | 1997-10-16 | Dsm N.V. | A method of increasing the adhesion between radiation-cured, inner primary coatings and optical glass fibers |
| US5812725A (en) * | 1996-04-10 | 1998-09-22 | Dsm N.V. | Method for increasing adhesion between a coating and an optical glass fiber electron beam pretreatment |
| GB2316019A (en) * | 1996-08-07 | 1998-02-18 | Siemens Ag | Coating an electrical and/or optical conductor with resin |
| US5993896A (en) * | 1996-08-07 | 1999-11-30 | Siemens Aktiengesellschaft | Method and apparatus for enveloping electrical and/or optical conductors with a resin |
| GB2316019B (en) * | 1996-08-07 | 2000-04-05 | Siemens Ag | Process and device for coating an electrical and/or optical conductor with resin |
| WO1999000337A1 (en) * | 1997-06-26 | 1999-01-07 | Alcatel | Method for making an optical conductor |
| FR2765346A1 (en) * | 1997-06-26 | 1998-12-31 | Alsthom Cge Alcatel | METHOD FOR MANUFACTURING AN OPTICAL CONDUCTOR |
| US6190483B1 (en) | 1997-06-26 | 2001-02-20 | Alcatel | Method for making an optical conductor |
| CN1101789C (en) * | 1997-06-26 | 2003-02-19 | 阿尔卡塔尔公司 | Method for making optical conductor |
| WO2009015825A2 (en) * | 2007-07-28 | 2009-02-05 | Leoni Bordnetz-Systeme Gmbh | Process and apparatus for the production of an elastomeric optical conductor fibre, and optical conductor fibre |
| WO2009015825A3 (en) * | 2007-07-28 | 2009-05-28 | Leoni Bordnetz Sys Gmbh | Process and apparatus for the production of an elastomeric optical conductor fibre, and optical conductor fibre |
| US8515229B2 (en) | 2007-07-28 | 2013-08-20 | Leoni Bordnetz-Systeme Gmbh | Process and apparatus for the production of an elastomeric optical conductor fiber and optical conductor fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8406320D0 (en) | 1984-04-11 |
| GB2155357B (en) | 1987-09-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |