GB1575663A - Composite board structure using a corrugated fibreboard and a method of and an apparatus for producing the composite board structure - Google Patents
Composite board structure using a corrugated fibreboard and a method of and an apparatus for producing the composite board structure Download PDFInfo
- Publication number
- GB1575663A GB1575663A GB30622/77A GB3062277A GB1575663A GB 1575663 A GB1575663 A GB 1575663A GB 30622/77 A GB30622/77 A GB 30622/77A GB 3062277 A GB3062277 A GB 3062277A GB 1575663 A GB1575663 A GB 1575663A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liner
- facing web
- needles
- composite board
- board structure
- 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
- 239000002131 composite material Substances 0.000 title claims description 71
- 238000000034 method Methods 0.000 title claims description 21
- 239000011096 corrugated fiberboard Substances 0.000 claims description 81
- 239000000463 material Substances 0.000 claims description 80
- 239000004744 fabric Substances 0.000 claims description 32
- 239000000123 paper Substances 0.000 claims description 30
- 239000000853 adhesive Substances 0.000 claims description 26
- 230000001070 adhesive effect Effects 0.000 claims description 26
- 229920001169 thermoplastic Polymers 0.000 claims description 24
- 239000004416 thermosoftening plastic Substances 0.000 claims description 24
- 239000000835 fiber Substances 0.000 claims description 23
- 238000003825 pressing Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000002759 woven fabric Substances 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 2
- 239000004831 Hot glue Substances 0.000 description 32
- 239000010408 film Substances 0.000 description 21
- 239000010410 layer Substances 0.000 description 21
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000004745 nonwoven fabric Substances 0.000 description 6
- 239000011094 fiberboard Substances 0.000 description 5
- -1 for example Polymers 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000012815 thermoplastic material Substances 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 230000001413 cellular effect Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
- B31F1/20—Corrugating; Corrugating combined with laminating to other layers
- B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
- B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
- B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
- B31F1/2822—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard involving additional operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/08—Corrugated paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/02—Layered products comprising a layer of paper or cardboard next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/04—Punching, slitting or perforating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/024—Woven fabric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
- B65D65/403—Applications of laminates for particular packaging purposes with at least one corrugated layer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/23907—Pile or nap type surface or component
- Y10T428/23943—Flock surface
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
- Y10T428/24322—Composite web or sheet
- Y10T428/24331—Composite web or sheet including nonapertured component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
- Y10T428/24322—Composite web or sheet
- Y10T428/24331—Composite web or sheet including nonapertured component
- Y10T428/24339—Keyed
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24628—Nonplanar uniform thickness material
- Y10T428/24669—Aligned or parallel nonplanarities
- Y10T428/24694—Parallel corrugations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24628—Nonplanar uniform thickness material
- Y10T428/24669—Aligned or parallel nonplanarities
- Y10T428/24694—Parallel corrugations
- Y10T428/24711—Plural corrugated components
- Y10T428/24727—Plural corrugated components with planar component
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Laminated Bodies (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8706976A JPS5312970A (en) | 1976-07-21 | 1976-07-21 | Process for molding packing material of corrugated cardboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1575663A true GB1575663A (en) | 1980-09-24 |
Family
ID=13904643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30622/77A Expired GB1575663A (en) | 1976-07-21 | 1977-07-21 | Composite board structure using a corrugated fibreboard and a method of and an apparatus for producing the composite board structure |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4170674A (enExample) |
| JP (1) | JPS5312970A (enExample) |
| FR (1) | FR2358980A1 (enExample) |
| GB (1) | GB1575663A (enExample) |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2498793A1 (fr) * | 1981-01-29 | 1982-07-30 | Snecma | Garniture insonorisante pour conduit de gaz notamment pour veine de soufflante de turboreacteur et outillage pour sa fabrication |
| JPS5948401A (ja) * | 1982-09-10 | 1984-03-19 | Kyushu Sankyo Kk | 崩壊分散性の良好な農薬粒剤 |
| US4531609A (en) * | 1983-08-06 | 1985-07-30 | Midwest Acounst-A-Fiber | Sound absorption panel |
| DE3445656A1 (de) * | 1984-12-14 | 1986-06-26 | Irbit Research + Consulting Ag, Freiburg/Fribourg | Schaumstoff-schallabsorptionskoerper |
| US4611687A (en) * | 1985-07-23 | 1986-09-16 | Nixon Michael T | Three-function acoustical panel |
| JPS6372257U (enExample) * | 1986-10-31 | 1988-05-14 | ||
| US4849269A (en) * | 1988-07-15 | 1989-07-18 | Nifty Products, Inc. | Subflooring composite |
| US5025888A (en) * | 1989-06-26 | 1991-06-25 | Grumman Aerospace Corporation | Acoustic liner |
| JP3043402B2 (ja) * | 1989-06-26 | 2000-05-22 | グラマン エアロスペース コーポレーション | 遮音板 |
| US4969535A (en) * | 1989-06-26 | 1990-11-13 | Grumman Aerospace Corporation | Acoustic liner |
| US5014815A (en) * | 1989-06-26 | 1991-05-14 | Grumman Aerospace Corporation | Acoustic liner |
| JP3076945B2 (ja) * | 1993-06-15 | 2000-08-14 | 松下電器産業株式会社 | 吸音装置 |
| US5879802A (en) * | 1996-09-12 | 1999-03-09 | Prince Corporation | Vehicle panel material |
| US5884962A (en) * | 1996-09-12 | 1999-03-23 | Prince Corporation | Impact absorption member |
| US6508751B1 (en) * | 1997-09-12 | 2003-01-21 | Sun Source L Llc | Method and apparatus for preforming and creasing container board |
| JP2004062074A (ja) * | 2002-07-31 | 2004-02-26 | Toyota Motor Corp | 吸音装置 |
| DE10328680A1 (de) * | 2003-06-26 | 2005-01-13 | Daimlerchrysler Ag | Vorrichtung und Verfahren zur Wärme-und/oder Schallisolierung bei Kraftfahrzeugen |
| AU2005235615B2 (en) | 2004-04-22 | 2010-07-22 | Dixie Consumer Products Llc | Insulating cup wrapper and insulated container formed with wrapper |
| US7767049B2 (en) | 2006-10-12 | 2010-08-03 | Dixie Consumer Products Llc | Multi-layered container having interrupted corrugated insulating liner |
| KR101718546B1 (ko) * | 2008-05-05 | 2017-03-21 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | 방음 복합체 |
| US8251175B1 (en) * | 2011-04-04 | 2012-08-28 | Usg Interiors, Llc | Corrugated acoustical panel |
| US9027706B2 (en) * | 2013-02-11 | 2015-05-12 | Federal-Mogul Powertrain, Inc. | Enhanced, lightweight acoustic scrim barrier |
| CN106976300A (zh) * | 2017-02-24 | 2017-07-25 | 蚌埠市振华包装机械有限责任公司 | 一种五层瓦楞纸生产工艺 |
| US10657947B2 (en) * | 2017-08-10 | 2020-05-19 | Zin Technologies, Inc. | Integrated broadband acoustic attenuator |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1025443A (en) * | 1911-02-11 | 1912-05-07 | Edward H Angier | Corrugated sheet. |
| US1953410A (en) * | 1931-04-30 | 1934-04-03 | Jacobson & Co | Acoustic tile |
| US2428591A (en) * | 1943-12-08 | 1947-10-07 | Owens Corning Fiberglass Corp | Insulating fabric |
| US3616135A (en) * | 1969-03-21 | 1971-10-26 | Silvano Tesainer | Carpetlike material |
| US3920496A (en) * | 1972-02-22 | 1975-11-18 | Michael C Wilkinson | Corrugated paperboard and its method of manufacture |
| US3904800A (en) * | 1974-03-18 | 1975-09-09 | John P Neubauer | Filament reinforced fiberboard for boxes |
| JPS51133922A (en) * | 1975-05-15 | 1976-11-20 | Nissan Motor | Sound insulation heat insulating material |
| JPS5221082A (en) * | 1976-02-05 | 1977-02-17 | Roth Sa Freres | Process for making panels from paper board and foaming agents as basic material and panels made therfrom |
-
1976
- 1976-07-21 JP JP8706976A patent/JPS5312970A/ja active Granted
-
1977
- 1977-07-20 FR FR7722265A patent/FR2358980A1/fr active Granted
- 1977-07-20 US US05/817,445 patent/US4170674A/en not_active Expired - Lifetime
- 1977-07-21 GB GB30622/77A patent/GB1575663A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2358980B1 (enExample) | 1981-05-29 |
| JPS573500B2 (enExample) | 1982-01-21 |
| JPS5312970A (en) | 1978-02-06 |
| FR2358980A1 (fr) | 1978-02-17 |
| US4170674A (en) | 1979-10-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19970720 |