GB2230868A - Optical printing system - Google Patents
Optical printing system Download PDFInfo
- Publication number
- GB2230868A GB2230868A GB9000900A GB9000900A GB2230868A GB 2230868 A GB2230868 A GB 2230868A GB 9000900 A GB9000900 A GB 9000900A GB 9000900 A GB9000900 A GB 9000900A GB 2230868 A GB2230868 A GB 2230868A
- Authority
- GB
- United Kingdom
- Prior art keywords
- microcapsules
- recording sheet
- sheet
- component
- types
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J19/00—Character- or line-spacing mechanisms
- B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
- B41J19/20—Positive-feed character-spacing mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/475—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material for heating selectively by radiation or ultrasonic waves
- B41J2/48—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material for heating selectively by radiation or ultrasonic waves melting ink on a film or melting ink granules
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/002—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor using materials containing microcapsules; Preparing or processing such materials, e.g. by pressure; Devices or apparatus specially designed therefor
- G03F7/0022—Devices or apparatus
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/028—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by thermal printers
- G06K15/029—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by thermal printers using optical beams
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/12—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers
- G06K15/1238—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers simultaneously exposing more than one point
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/12—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers
- G06K15/129—Colour printing
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2227/00—Photographic printing apparatus
- G03B2227/32—Projection printing apparatus, e.g. enlarging apparatus, copying camera
- G03B2227/325—Microcapsule copiers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Photographic Developing Apparatuses (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Color Printing (AREA)
Abstract
In an optical printing system for printing an image on a recording sheet, adopted as the recording sheet is a sheet coated with microcapsules on one surface thereof. Each microcapsule envelopes a first component which change color when reacts with a second component. The second component may be coated on the recording sheet or may be coated on a separate developing shoot. The microcapsule further envelopes a third component which varies the mechanical strength of microcapsule when light is projected thereto. An image is formed on the recording sheet by selectively exposing a light thereto in accordance with the image to be printed thereon, and the microcapsules on the recording sheet whose mechanical strength is low are then ruptured by rupturing means. Thereby, the color is developed or the recording sheet on the separate developing sheet by the reaction of the first component with the second component. The microcapsules are of three types, corresponding to three colours. Radiation of three wavelengths appropriate to the three types of microcapsule is provided at once.
Description
OPTICAL PRINTING SYSTEM
This invention relates to an optical printing system capable of printing characters, patterns or the like by using light.
Printers utilized in computers or the like age classified into various types according to their printing systems. Use of photoprinters has been increased in recent years because of their high printing speed and low operating noise. As the apparatus of this type, those utilizing electrophotographic technique are used in most cases. According to the electrophotographic technique, an image of a character or a pattern is formed on a charged photosensitive member by utilizing a suitable optical system, powders of colored resin called toner is adhered to the not-irradiated portion on the photosensitive member that is the portion still retaining charge, the adhered powders are transferred onto a copying paper, and then the transferred powder image is fixed to obtain a copy.
The photoprinter described above requires to use a photoconductor, a toner applying apparatus and a heat fixing device of the toner. Moreover, as the toner is a consumptive material it is necessary to always store and supplement the toner. For this reason, the construction of the apparatus becomes complicated and the maintenance thereof is troublesome.
There has also been used a photocolor printer in which colored characters or picture images are printed on a photo and pressure sensitive sheet by photosignals such as laser photo-signals.
In a color printer other than the laser printer described above multicolor toners (for example, red, green and blue colors) or color ink ribbons are used to obtain a print of all colors. With such color printing system, however, as it is necessary to print the same portion of the recording paper by the times the same as the number of colors. Accordingly, the printing speed becomes low.
It is therefore an aim of this invention to provide an improved optical printing system which does not use toners, and can have a high resolution, and may record characters and picture images at a high speed.
According to the present invention there is provided a photoelectric printing apparatus for printing on a recording sheet, said recording sheet being uniformly coated with a plurality of microcapsules of three types, each of said microcapsules enveloping a first component which changes colour on reaction with a second component, and a third component which varies the mechanical strength of said microcapsules when exposed to light, microcapsules of the three types having different third components sensitive to different wavelength ranges; said apparatus comprising a plurality of light sources respectively emitting light of wavelengths to which respective types of said microcapsules are sensitive, control means for causing said light sources to generate photosignals in accordance with character or other patterned image information, and scanning means for scanning said recording sheet with said photosignals whereby said recording sheet is exposed in accordance with said character or other patterned image information and developing means for developing an image on said sheet by rupturing those of said microcapsules which have relatively low mechanical strengths, said plurality of light sources including three laser oscillators emitting laser beams of wavelengths to which respective ones of said different types of microcapsules are sensitive, and including optical means for combining said laser beams into a single beam and wherein said scanning means can scan said recording sheet with said single beam.
The invention will be further described by way of non-limitative example with reference to the accompanying drawings, in which:
Fig. 1 is a perspective view showing principal portions of a photoprinter utilizing transparent printing types and useful for describing the invention;
Figs. 2A through 2D are diagrams showing the construction of a photosensitive recordng sheet and explaining development and fixing treatments;
Fig. 3 is a diagrammatic representation of a laser printer according to the invention;
Fig. 4 is a plan view showing the laser beam oscillator shown in Fig. 3.
Fig. 1 shows principal parts of a photoprinter utilizing a printing-type wheel 30, on the peripheral portion of which a font of type characters are formed as being transparent. The printer comprises a pair.of sheet feed follers 12 for upwardly feeding a photosensitive recording sheet 10 from a roll 10a, an exposing device 14 for exposing a light against the sheet 10 in accordance with a shaped of a selected type character on the wheel 30, a pair of press rollers 16 for applying a pressure to the exposed sheet 10.
Although not shown, the pressed sheet 10 is then sent to a conventional developing device and a fixing device.
The exposing device 14 comprises a carriage 18, an endless belt 20 with teeth on the inner surface which supporting the carriage 18 and extending in a direction perpendicular to the direction of movement of the photosensitive recording sheet 10, and an electric motor 22 for driving the endless belt 20 through gears 24. The carriage 18 is provided with-the transparent printing type wheel 30 disposed in parallel with the recording sheet 10, and a lamp 34 is disposed to illuminate only one type character.
The photoprinter shown in Fig. 1 operates as follows. In response to a printing instruction, the character selection motor 32 rotates the transparent printing type wheel 30 and stops the same when a desired type character is brought ,to the position of the lamp 34. Then, it, is turned on to project a light upon the photosensitive recording sheet 10 through the selected transparent type character. After that, the carriage 18 is moved to the next printing position at which the next exposure is performed. When the exposure of one line completes, the photosensitive recording sheet 10 is moved upwardly by a distance corresponding to one line. Then the carriage 18 is moved in the opposite direction for exposing the next one line.
The development and fixing of the photosensitive recording sheet 10 after passing through the press rollers 16 are carried out as follows. As the photosensitive recording sheet 10 comprises, as shown in Figs. 2A and 2B, a sheet of paper 40 used as the supporting member and microcapsules are uniformly layed on the paper 40. Each microcapsule contains a dye precusor (for example Triallylmethane compound) and photo-softenable resin (for example Poly-3-oxyamino-2butanon methacrylate). The paper sheet 40 is futher coated with a layer 42 of a chromogenic material, for example an organic acid, which react with the dye precursor to develop a color.With this construction, only the microcapsules 44 irradiated with Xenon light transmitting through a selected transparent type character of the transparent printing type wheel 30 become soft, whereas microcapsules 40 not irradiated with Xenon light still maintain the initial hard state.
Consequently, by the pressure applied by press rollers 16, only the softened microcapsules are crushed so that only the portions of the paper sheet 40 corresponding to characters are colored. This is an example of printing characters on an ordinary paper sheet.
In another example shown in Figs. 2C and 2D, a film 50 is used as the supporting member. In this example, each microcapsule contains a dye precursor, a photo-curable resin (for example such photopolymer as
Polymethylpropane), and a photo-polymerizing initiator (for example Benzophenone) and a chromogenic material 52 is coated on the film 50. One example of such photosensitive recording sheet 10 is described in the
United Patent Specification No. 4399209 or 4440846.
Where the microcupsules on the recording sheet 10 irradiated with light are hardened as shown in Fig. 2C, whereas those not irradiated are not hardened. When
applied with pressure by the press rollers 16, only the
unhardened microcapsules are crushed thus forming a
negative image on the recording sheet 10 corresponding -to the selected transparent type character of the
printing type wheel 30. Hardened microcapsules 54 are
not crushed so that the printed character image can be
developed. The developed character image can be used
to form a manuscript negative film for producing a
plurality of copies.
Instead of coating a chromogenic material on a paper sheet or film, the paper sheet or film may be
colored beforehand, and a decolorizing agent such as a bleaching agent may be enveloped in the microcapsules
instead of the dye precursor. Then a positive image can be obtained.
Further, instead of the printing type wheel 30 as
above described, the printing type wheel having a font
of type characters formed to shield a light while the
remaining portions thereof being formed to transmit a
light there through can be used. In this case, a
negative image is printed on the recording sheet.
As above described, where the photoprinter of this embodiment is used with a photosensitive recording
sheet of a desired type, a positive or negative printed
character image can readily be obtained. Moreover, since no photoconductor is used and no consumptive material other than recording sheet is required, the construction of the apparatus becomes simple and supplement of the consumptive material is not necessary.
The photosensitive recording sheet optically printed with characters or patterns is applied with mechanical pressure by press rollers so as to rupture the microcapsules.
The photoprinter of this invention does not require a photoconductor, toner applying apparatus and thermal fixing device of the toner. Moreover, no consumptive material other than the toner is not used.
Fig. 3 shows an embodiment of this invention in which elements corresponding to those shown in Fig. 1 are designated by the same reference numerals.
In this embodiment, a special photo and pressure sensitive sheet 313 is used as a recording paper in which various kinds of microcapsules respectively containing cyan color developing agent, a magenta color developing agent, and a yellow color developing agent.
These agents having different photosensitive wavelength regions are mixedly and uniformly coated on a sheet or paper. More particularly, as the photo and pressure sensitive paper are known a self-color-developing type and a transfer printing type. In this embodiment, the former type is used. In the so called self-colordeveloping type photo and pressure sensitive sheet, the cyan, magenta and yellow color developing agents are contained in discrete microcapsules together with a photosensitive resin, a polymerizing initiator, and a photosensitizing agent, and mixture of the microcapsules and a chromogenic material is uniformly coated on a paper sheet. With the self-colordeveloping type photo and pressure sensitive sheet, by irradiating the microcapsules with lights having wavelengths sensed by cyan, magenta and yellow respectively, corresponding microcapsules are hardened.
Thereafter, when the photo and pressure sensitive sheet is passed between pressure rollers 320 to rupture unhardened microcapsules the color developing agents such as cyan etc. reacts with the chromogenic material to develop desired colors.
Assume now that the spectrum sensitivity characteristic of the photo and pressure sensitive sheet has a peak sensitivity for cyan color at a wavelength of 650mm, a peak sensitivity for magenta color at a wavelength of 550mm, and a peak sensitivity for yellow color at a wavelength of 400mm, the laser light oscillator is constituted by a cyan oscillar 314 producing cyan light having a wavelength of 650mm sensable by the cyan microcapsules, a magenta oscillator 315 producing magenta light having a wavelength of 550mm sensable by the magenta microcapsules and a yellow oscillator 316 producing yellow light sensable by the yellow microcapsules.The beams emitted by respective oscillators 314,315 and 316 are gathered together, as illustrated in Fig. 4, through total reflection mirror 317 and half mirrors 318, and then projected upon a polygonal scanning mirror 303 through a condenser lens 319. The laser beam reflected by the scanning mirror 303 is used to directly scan the photo and pressure sensitive sheet 313 through lens 305. After irradiation, the sheet 313 is passed between press rollers 320.
To produce a color print by using the photoprinter described above, oscillators 314, 315 and 316 are
ON/OFF controlled by printing or picture image informations issued by a control unit, not shown, contained in the printer. for example, where only the cyan oscillator 314 is turned ON while magenta and yellow oscillator 315 and 316 are turned OFF, only the cyan microcapsules are hardened. As a consequence, magenta and yellow microcapsules are ruptured by the press rollers 320 whereby the color developing agents contained in the crushed microcapsules react with the chromogenic material to dovelop red color corresponding to a mixture of magenta and yellow colors.In the same manner, when only the magenta oscillator 315 is turned
ON while cyan and yellow oscillators 314 and 316 are turned OFF, the cyan and yellow microcapsules are ruptured by press rollers 320, thereby developing green color. Furthermore, when only the yellow oscillator 316 is turned ON while cyan and magenta oscillators 314 and 315 are turned OFF, blue color is developed. When cyan and magenta oscillators 314 and 315 are turned ON while the yellow oscillator 316 is turned OFF, only the yellow microcapsules are ruptured so that yellow color is developed. In the same manner, cyan or magenta color can be developed. When cyan, magenta and yellow oscillators 314, 315 and 316 are all turned ON, since no microcapsule is ruptured, the Shoto and pressure sensitive sheet remains white.On the other hand, when cyan, magenta and yellow oscillators 314, 315 and 316 are turned OFF, all microcapsules are ruptured thereby developing black color, that is a mixture of three original colors.
In the transfer printing type photo and pressure sensitive sheet described above, three color (cyan, magenta and yellow) developing agents are enveloped respetively in different microcapsules and these capsules are coated on a paper sheet. Regarding the chromogenic material it is coated on a separate transfer printing paper. After exposing the photo and pressure sensitive sheet it is superposed on the transfer printing paper and unhardened microcapsules on the photo and pressure sensitive sheet and crushed by press rollers 320. As a consequence, color developing agents react with the chromogenic material on the transfer printing paper thereby recording characters or pattern images on the transfer printing paper.
As above described with the photoprinter of this modification, characters or pattern images of any desired color can be recorded on a photo and pressure sensitive sheet coated with microcapsules respectively containing cyan, magenta and yellow color developing agents. Moreover, when cyan, magenta and yellow laser oscillators 314, 315 and 316 are simultaneously controlled a color print can be made at a time, thereby increasing the recording speed. Moreover since it is not necessary to use a toner for recording on the photo and pressure sensitive sheet not only a high resolution can be obtained but also such accessories as a photosensitive drum is not necessary, so that construction can be simplified and the manufacturing cost can be reduced.
The present application is divided on our application 8707800 (2190210) which is directed to the invention of Figure 1 and similar embodiments. Attention is directed to our application of even date herewith also divided on the said application.
Claims (2)
1. A photoelectric printing apparatus for printing on a recording sheet, said recording sheet being uniformly coated with a plurality of microcapsules of three types, each of said microcapsules enveloping a first component which changes colour on reaction with a second component, and a third component which varies the mechanical strength of said microcapsules when exposed to light, microcapsules of the three types having different third components sensitive to different wavelength ranges; said apparatus comprising a plurality of light sources respectively emitting light of wavelengths to which respective types of said microcapsules are sensitive, control means for causing said light sources to generate photosignals in accordance with character or other patterned image information, and scanning means for scanning said recording sheet with said photosignals whereby said recording sheet is exposed in accordance with said character or other patterned image information and developing means for developing an image on said sheet by rupturing those of said microcapsules which have relatively low mechanical strengths, said plurality of light sources including three laser oscillators emitting laser beams of wavelengths to which respective ones of said different types of microcapsules are sensitive, and including optical means for combining said laser beams into a single beam and wherein said scanning means can scan said recording sheet with said single beam.
2. A printing apparatus constructed and arranged to operate substantially as hereinbefore described with reference to and as illustrated in Figures 3 and 4 of the accompanying drawings.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61076282A JPS62231758A (en) | 1986-04-01 | 1986-04-01 | Optical printer |
| JP10543286U JPS6311630U (en) | 1986-07-09 | 1986-07-09 | |
| JP61175897A JPS6331364A (en) | 1986-07-25 | 1986-07-25 | Optical color printer |
| GB8707800A GB2190210B (en) | 1986-04-01 | 1987-04-01 | Optical printing system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9000900D0 GB9000900D0 (en) | 1990-03-14 |
| GB2230868A true GB2230868A (en) | 1990-10-31 |
| GB2230868B GB2230868B (en) | 1991-01-23 |
Family
ID=27449905
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9000901A Expired - Fee Related GB2230869B (en) | 1986-04-01 | 1990-01-16 | Optical printing system |
| GB9000900A Expired - Fee Related GB2230868B (en) | 1986-04-01 | 1990-01-16 | Optical printing system |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9000901A Expired - Fee Related GB2230869B (en) | 1986-04-01 | 1990-01-16 | Optical printing system |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB2230869B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7029112B2 (en) | 2002-08-05 | 2006-04-18 | Mars, Incorporated | Ink-jet printing on surface modified edibles and products made |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1459206A (en) * | 1972-12-14 | 1976-12-22 | Nigg J | Additive colour mixing head |
| EP0164931A2 (en) * | 1984-06-15 | 1985-12-18 | The Mead Corporation | Photosensitive materials and imaging processes using such materials |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2007191A1 (en) * | 1970-02-17 | 1971-09-02 | Agfa Gevaert Ag | Data output device |
| US4234250A (en) * | 1977-07-15 | 1980-11-18 | Xerox Corporation | Electrophotographic printing system |
| US4382675A (en) * | 1981-01-23 | 1983-05-10 | Energy Conversion Devices, Inc. | Apparatus for producing microform records from multiple data sources |
| US4448516A (en) * | 1982-07-13 | 1984-05-15 | The Mead Corporation | Developer roll |
-
1990
- 1990-01-16 GB GB9000901A patent/GB2230869B/en not_active Expired - Fee Related
- 1990-01-16 GB GB9000900A patent/GB2230868B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1459206A (en) * | 1972-12-14 | 1976-12-22 | Nigg J | Additive colour mixing head |
| EP0164931A2 (en) * | 1984-06-15 | 1985-12-18 | The Mead Corporation | Photosensitive materials and imaging processes using such materials |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7029112B2 (en) | 2002-08-05 | 2006-04-18 | Mars, Incorporated | Ink-jet printing on surface modified edibles and products made |
| US7500744B2 (en) | 2002-08-05 | 2009-03-10 | Mars, Incorprated | Ink-jet printing on surface modified edibles and products made |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2230868B (en) | 1991-01-23 |
| GB2230869B (en) | 1991-01-23 |
| GB9000900D0 (en) | 1990-03-14 |
| GB9000901D0 (en) | 1990-03-14 |
| GB2230869A (en) | 1990-10-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20020401 |