CA1159691A - Infrared light transmission path - Google Patents
Infrared light transmission pathInfo
- Publication number
- CA1159691A CA1159691A CA000376930A CA376930A CA1159691A CA 1159691 A CA1159691 A CA 1159691A CA 000376930 A CA000376930 A CA 000376930A CA 376930 A CA376930 A CA 376930A CA 1159691 A CA1159691 A CA 1159691A
- Authority
- CA
- Canada
- Prior art keywords
- transmission path
- infrared light
- light transmission
- fibers
- crystal
- 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
- 230000005540 biological transmission Effects 0.000 title claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 28
- 239000013078 crystal Substances 0.000 claims abstract description 20
- -1 silver halide Chemical class 0.000 claims abstract description 20
- 229910052709 silver Inorganic materials 0.000 claims abstract description 11
- 239000004332 silver Substances 0.000 claims abstract description 11
- 229910052716 thallium Inorganic materials 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 239000004033 plastic Substances 0.000 claims abstract description 5
- 229920003023 plastic Polymers 0.000 claims abstract description 5
- 230000003287 optical effect Effects 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910021607 Silver chloride Inorganic materials 0.000 description 3
- 150000004820 halides Chemical class 0.000 description 3
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical group [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical group Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910018557 Si O Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- 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
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4403—Optical cables with ribbon structure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0818—Waveguides
- G01J5/0821—Optical fibres
-
- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/102—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type for infrared and ultraviolet radiation
Abstract
ABSTRACT OF THE DISCLOSURE
An infrared light transmission path for transmitting heat rays is disclosed. The path consists of a plurality of fibers of a silver halide crystal, a mixed crystal of silver halide, a thallium halide crystal or a mixed crystal of thallium halide, and these fibers are encased in a rubber or plastic flexible coating.
An infrared light transmission path for transmitting heat rays is disclosed. The path consists of a plurality of fibers of a silver halide crystal, a mixed crystal of silver halide, a thallium halide crystal or a mixed crystal of thallium halide, and these fibers are encased in a rubber or plastic flexible coating.
Description
1 15~69 1 INFRARED LIGHT TRANSMISSION PATH
FIELD OF THE INVENTION
This invention relates to an infrared light trans-mission path, BACKGROUND OF THE INVENTION
Objects radiate infrared rays whose energy varies with their temperature. The relation between the wavelength for the peak of the magnitude of the radiation and the temper-ature of the object is reprèsented by~formula ~1) that is derived from Planck's law of radiation:
~m.T -~ K ................ (1 wherein ~m is the wavelength (~m)at which a maximum in~ensity '~ ' of light is radiated, T is the absolute temperature ~K) of the object, and K is the constant (K = 2897 ~m.deg).
This formula indicates that the temperature of an object can be known by detecting lts lnfrared spectrum.
A wide range of temperatures can be determined by lnfrared light transmitting flbers made of a silver halide or thallium halide crystal that transmlts light in the far "
infrared sp,ectrum of from 0.5 to 15 microns~ and which is easy to produce polycrystalline fiber by~hot working. An,optical temperature measurement generally involves the guiding of light from a remote or inaccessible source to an infrared spectrum detecting optical system by means of a lens, prism or reflective mirror. This method ~L
7~
, .
:,, . :
. .
1 ~S9~9~
requires much time in adjusting the optical axis precisely, and to maintain the optical accuracy, the equipment must be installed in a place where dust does not build up on the lens or reflective mirror or where minimum vibrations occur.
A system is known that transmits light from the source to the light detector over a desired path of quartz glass fibers that are used as optical fibers for communicationO
The formula (1) indicates that the light radiated from an object having a temperature of 773K ~500C) has a peak wave-10 length at about 3.8 microns, and it shifts to a longer wavelength if the temperature of the object is decreased. Therefore, the system of using quartz glass is unsuitable for measuring the temperature of cold objects; quartz glass has a great -- -absorption loss at about ~.75 microns due to the vibration of the lattice of Si-O bond and this affects the transmission of infrared light.
SUMMARY OF THE INVENTION
Therefore, one object of this invention is to eliminate these defects of the conventional technique and provide an infrared light transmission path that transmits a wide spectrum of light and hence can measure a wide range of temperatures.
BRIEF DESCRIPTION OF THE DRAWINGS
- ~
FIGS. 1 and 2 are illustrations of two ~ypes of fibers that make up the infrared light transmission path of ' ' .
g69 this invention;
FIGS. 3 and 4 are perspective views of the infrared light transmission path of this invention according to two different embodiments; and FIG. 5 is a block diagram of a temperature measure-ment system using the infrared light transmission path of FIGS. 3 and ~.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 depicts a fiber having a circular cross section produced by hot extrusion, and FIG. 2 depicts a fiber having a rectangular cross section produced by hot rolling.
Either fiber is of step index type wherein the core ~1) has a higher refractive index t.han the cladding ~2) to confine light rays in the core. The fiber may be of graded index type wherein the refractive index decreases from the center outward. FIG. 3 illustrates an infrared light transmission path comprising a bundle of fibers encased in a large-diameter cylindrical plastic tube. In the figure, ~3) l5 an individual fiber, ~4) is a primary coating, and ~5) is a secondary coat-ing. FIG. 4 illustrates an infrared light transmission path comprising a row of fibers encased in a flat plastic tube.
Each fiber is made of flexible silver halide or thallium halide and is encased in an easily deformable plastic or rubber tube, so the resulting infrared light transmission path is also flexible. Each of the primary and secondary coatings serving 9B~ 1 as the flexible encasing may consist of t~o or more layers.
The infrared light transmission paths of FIGS. 3 and 4 are used in an optical temperature measuring system as shown in the bloc~ diagram of FIG. 5, wherein (6) is an object whose temperature is to be measured, (7) is an image forming optical system (lens), ~8) is an infrared light transmission path, and (9) is a temperature measuring unit comprising a light detector and a signal processing section.
By using more fibers and collecting more light, a temperature measuring system more sensitive than a single fiber can be produced. By connecting the individual fibers to respective light detectors, an image of temperaute distributlon, hence an image of heat rays, can be measured. By connecting a light detec~or to each of the fibers arranged in a row as in FIG. 4, a system capable of detecting the position of an object or detecting its movement according to a change in time can be produced.
The halide of the silver halide crystal, a mixed of the silver halide crystal, a mixed crystal of silver halided, a thallium halide crystal or a mixed crystal of thallium halide can be fluoride~, bromlde, chloride or iodide.
The fiber according to this invention is preferably composed of the crystals having the same halide portion, but a mixed crystal can be those having different halides. A preferred silver halide is silver bromide or silver chloride.
~, !
, ', 1 ~5g~
The proportion of these crystals is not critical and can be any proportion in the fiber o-f this invention.
This invention is now described in greater detail by reference to the follo~ing example which is given here for illustrative purposes only and is by no means intended to limit the scope of the invention.
Example - A cylinder of ground silver bromide crystal was . fitted into a hollow tube of ground silver chloride crystal ; 10 - to form an extrudable billet. The billet was hot extruded at - - a temperature between 180C and 350C to form a fiber 0.5 to 1.0 mm in diameter made of a sllver bromide core and a silver - chloride cladding. A hundred of these fibers were bundled into a cylinder and covered with a primary coating of heat-shrinkable , 15 tetrafluoride resin and a secondary coating of high-density ` polyethylene to thereby form an infrared light transmission path about 1.5 cm in diameter. A length of about 40 cm of the flexible infrared light transmission path was connected - between the light source of a single-beam infrared spectroscope and a light detector. A spectroscopic analysis with this ~ system gave a transmittance between about 60% and 70% in a wavelength range of 1 to 15 microns, with the reflection loss - - .
at both ends of the transmission path measured. The system could detect the light radiated from an object whose temperature varied from about 3000K to about 2000K, so it was found to be applicable to the measurement of temperatures.
. .
. , .- -, ~ :
.
:~ :
~ 315g~
As described in the foregoing, the infrared light transmission path of this invention uses fibers that is made of silver halide or thallium halide that transmits infrared rays, so it transmits a wide spectrum of light and can measure a wide range of temperatures. The fibers are flexible, and therefore a high degree of freedom is allowed for connecting the transmission path between an object the temperature of which is to be measured (a light source) and a detector (a light detector~. A higher sensitivity can be obtained by increasing the number of fibers to be encased so as to collect more light. Another advantage is that an image of heat rays can be produced by connecting detectors to the respective fibers. The infrared light transmission path of this invention is used with advantage in an o~tical temperature measuring system, position detector, image forming device for temperature distribution, etc.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
:
,.
: - ~
. . . :
:
.
FIELD OF THE INVENTION
This invention relates to an infrared light trans-mission path, BACKGROUND OF THE INVENTION
Objects radiate infrared rays whose energy varies with their temperature. The relation between the wavelength for the peak of the magnitude of the radiation and the temper-ature of the object is reprèsented by~formula ~1) that is derived from Planck's law of radiation:
~m.T -~ K ................ (1 wherein ~m is the wavelength (~m)at which a maximum in~ensity '~ ' of light is radiated, T is the absolute temperature ~K) of the object, and K is the constant (K = 2897 ~m.deg).
This formula indicates that the temperature of an object can be known by detecting lts lnfrared spectrum.
A wide range of temperatures can be determined by lnfrared light transmitting flbers made of a silver halide or thallium halide crystal that transmlts light in the far "
infrared sp,ectrum of from 0.5 to 15 microns~ and which is easy to produce polycrystalline fiber by~hot working. An,optical temperature measurement generally involves the guiding of light from a remote or inaccessible source to an infrared spectrum detecting optical system by means of a lens, prism or reflective mirror. This method ~L
7~
, .
:,, . :
. .
1 ~S9~9~
requires much time in adjusting the optical axis precisely, and to maintain the optical accuracy, the equipment must be installed in a place where dust does not build up on the lens or reflective mirror or where minimum vibrations occur.
A system is known that transmits light from the source to the light detector over a desired path of quartz glass fibers that are used as optical fibers for communicationO
The formula (1) indicates that the light radiated from an object having a temperature of 773K ~500C) has a peak wave-10 length at about 3.8 microns, and it shifts to a longer wavelength if the temperature of the object is decreased. Therefore, the system of using quartz glass is unsuitable for measuring the temperature of cold objects; quartz glass has a great -- -absorption loss at about ~.75 microns due to the vibration of the lattice of Si-O bond and this affects the transmission of infrared light.
SUMMARY OF THE INVENTION
Therefore, one object of this invention is to eliminate these defects of the conventional technique and provide an infrared light transmission path that transmits a wide spectrum of light and hence can measure a wide range of temperatures.
BRIEF DESCRIPTION OF THE DRAWINGS
- ~
FIGS. 1 and 2 are illustrations of two ~ypes of fibers that make up the infrared light transmission path of ' ' .
g69 this invention;
FIGS. 3 and 4 are perspective views of the infrared light transmission path of this invention according to two different embodiments; and FIG. 5 is a block diagram of a temperature measure-ment system using the infrared light transmission path of FIGS. 3 and ~.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 depicts a fiber having a circular cross section produced by hot extrusion, and FIG. 2 depicts a fiber having a rectangular cross section produced by hot rolling.
Either fiber is of step index type wherein the core ~1) has a higher refractive index t.han the cladding ~2) to confine light rays in the core. The fiber may be of graded index type wherein the refractive index decreases from the center outward. FIG. 3 illustrates an infrared light transmission path comprising a bundle of fibers encased in a large-diameter cylindrical plastic tube. In the figure, ~3) l5 an individual fiber, ~4) is a primary coating, and ~5) is a secondary coat-ing. FIG. 4 illustrates an infrared light transmission path comprising a row of fibers encased in a flat plastic tube.
Each fiber is made of flexible silver halide or thallium halide and is encased in an easily deformable plastic or rubber tube, so the resulting infrared light transmission path is also flexible. Each of the primary and secondary coatings serving 9B~ 1 as the flexible encasing may consist of t~o or more layers.
The infrared light transmission paths of FIGS. 3 and 4 are used in an optical temperature measuring system as shown in the bloc~ diagram of FIG. 5, wherein (6) is an object whose temperature is to be measured, (7) is an image forming optical system (lens), ~8) is an infrared light transmission path, and (9) is a temperature measuring unit comprising a light detector and a signal processing section.
By using more fibers and collecting more light, a temperature measuring system more sensitive than a single fiber can be produced. By connecting the individual fibers to respective light detectors, an image of temperaute distributlon, hence an image of heat rays, can be measured. By connecting a light detec~or to each of the fibers arranged in a row as in FIG. 4, a system capable of detecting the position of an object or detecting its movement according to a change in time can be produced.
The halide of the silver halide crystal, a mixed of the silver halide crystal, a mixed crystal of silver halided, a thallium halide crystal or a mixed crystal of thallium halide can be fluoride~, bromlde, chloride or iodide.
The fiber according to this invention is preferably composed of the crystals having the same halide portion, but a mixed crystal can be those having different halides. A preferred silver halide is silver bromide or silver chloride.
~, !
, ', 1 ~5g~
The proportion of these crystals is not critical and can be any proportion in the fiber o-f this invention.
This invention is now described in greater detail by reference to the follo~ing example which is given here for illustrative purposes only and is by no means intended to limit the scope of the invention.
Example - A cylinder of ground silver bromide crystal was . fitted into a hollow tube of ground silver chloride crystal ; 10 - to form an extrudable billet. The billet was hot extruded at - - a temperature between 180C and 350C to form a fiber 0.5 to 1.0 mm in diameter made of a sllver bromide core and a silver - chloride cladding. A hundred of these fibers were bundled into a cylinder and covered with a primary coating of heat-shrinkable , 15 tetrafluoride resin and a secondary coating of high-density ` polyethylene to thereby form an infrared light transmission path about 1.5 cm in diameter. A length of about 40 cm of the flexible infrared light transmission path was connected - between the light source of a single-beam infrared spectroscope and a light detector. A spectroscopic analysis with this ~ system gave a transmittance between about 60% and 70% in a wavelength range of 1 to 15 microns, with the reflection loss - - .
at both ends of the transmission path measured. The system could detect the light radiated from an object whose temperature varied from about 3000K to about 2000K, so it was found to be applicable to the measurement of temperatures.
. .
. , .- -, ~ :
.
:~ :
~ 315g~
As described in the foregoing, the infrared light transmission path of this invention uses fibers that is made of silver halide or thallium halide that transmits infrared rays, so it transmits a wide spectrum of light and can measure a wide range of temperatures. The fibers are flexible, and therefore a high degree of freedom is allowed for connecting the transmission path between an object the temperature of which is to be measured (a light source) and a detector (a light detector~. A higher sensitivity can be obtained by increasing the number of fibers to be encased so as to collect more light. Another advantage is that an image of heat rays can be produced by connecting detectors to the respective fibers. The infrared light transmission path of this invention is used with advantage in an o~tical temperature measuring system, position detector, image forming device for temperature distribution, etc.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
:
,.
: - ~
. . . :
:
.
Claims (3)
1. An infrared light transmission path for transmitting heat rays which consists of a plurality of fibers of a crystal selected from the group consisting of a silver halide crystal, a mixed crystal of silver halide, a thallium halide crystal and a mixed crystal of thallium halide, said fibers being encased in a rubber or plastic flexible coating.
2. An infrared light transmission path as claimed in claim 1 wherein said fibers are arranged in a cylindrical form.
3. An infrared light transmission path as claimed in claim 1 wherein said fibers are arranged in a flat form.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6149880A JPS56156803A (en) | 1980-05-09 | 1980-05-09 | Infrared light transmission line |
| JP61498/80 | 1980-05-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1159691A true CA1159691A (en) | 1984-01-03 |
Family
ID=13172814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000376930A Expired CA1159691A (en) | 1980-05-09 | 1981-05-06 | Infrared light transmission path |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS56156803A (en) |
| CA (1) | CA1159691A (en) |
| DE (1) | DE3118327A1 (en) |
| FR (1) | FR2482314B1 (en) |
| GB (1) | GB2076988B (en) |
| NL (1) | NL8102231A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5880602A (en) * | 1981-11-09 | 1983-05-14 | Sumitomo Electric Ind Ltd | Fiber for infrared light |
| DE3325930C2 (en) * | 1983-07-19 | 1986-07-03 | Gebr. Bindler Maschinenfabrik GmbH & Co KG, 5275 Bergneustadt | Device for heating delimited areas of a multi-part object that are to be connected to one another |
| CN104991326A (en) * | 2015-07-24 | 2015-10-21 | 长飞光纤光缆股份有限公司 | Optical cable in central sleeve structure |
| EP4127625A1 (en) * | 2020-04-16 | 2023-02-08 | Huawei Technologies Co., Ltd. | Thermal radiation detection device and system, as well as electronic device comprising such a device or system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4217199Y1 (en) * | 1966-12-29 | 1967-10-03 | ||
| DE2513722B2 (en) * | 1975-03-25 | 1979-09-06 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Optical cable |
| DE2821642B2 (en) * | 1977-05-24 | 1980-02-07 | Hughes Aircraft Co., Culver City, Calif. (V.St.A.) | Fiber optic waveguides and process for their manufacture |
| US4170997A (en) * | 1977-08-26 | 1979-10-16 | Hughes Aircraft Company | Medical laser instrument for transmitting infrared laser energy to a selected part of the body |
-
1980
- 1980-05-09 JP JP6149880A patent/JPS56156803A/en active Pending
-
1981
- 1981-05-06 CA CA000376930A patent/CA1159691A/en not_active Expired
- 1981-05-07 NL NL8102231A patent/NL8102231A/en not_active Application Discontinuation
- 1981-05-08 DE DE19813118327 patent/DE3118327A1/en active Granted
- 1981-05-08 GB GB8114107A patent/GB2076988B/en not_active Expired
- 1981-05-08 FR FR8109255A patent/FR2482314B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL8102231A (en) | 1981-12-01 |
| DE3118327C2 (en) | 1988-10-20 |
| JPS56156803A (en) | 1981-12-03 |
| GB2076988A (en) | 1981-12-09 |
| GB2076988B (en) | 1983-11-09 |
| FR2482314B1 (en) | 1986-06-20 |
| FR2482314A1 (en) | 1981-11-13 |
| DE3118327A1 (en) | 1982-04-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |