GB1589715A - Structural panels - Google Patents

Structural panels Download PDF

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Publication number
GB1589715A
GB1589715A GB28204/76A GB2820476A GB1589715A GB 1589715 A GB1589715 A GB 1589715A GB 28204/76 A GB28204/76 A GB 28204/76A GB 2820476 A GB2820476 A GB 2820476A GB 1589715 A GB1589715 A GB 1589715A
Authority
GB
United Kingdom
Prior art keywords
corrugated
panel
interstructure
layer
metallic
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
Application number
GB28204/76A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB28204/76A priority Critical patent/GB1589715A/en
Publication of GB1589715A publication Critical patent/GB1589715A/en
Expired legal-status Critical Current

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Classifications

    • 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 form; Layered products 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 form; Layered products 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 form; Layered products 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products 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 form; Layered products 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 form; Layered products 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/02—Layer formed of wires, e.g. mesh
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
    • E04C2/3405—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by profiled spacer sheets
    • 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
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/08—Reinforcements
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/414—Translucent
    • 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
    • B32B2607/00—Walls, panels
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
    • E04C2/3405—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by profiled spacer sheets
    • E04C2002/3444—Corrugated sheets
    • E04C2002/345—Corrugated sheets with triangular corrugations
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
    • E04C2002/3488—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by frame like structures

Description

(54) IMPROVEMENTS IN OR RELATING TO STRUCTURAL PANELS (71) I, FREDERICK ARTHUR RIGBY, a British subject of 5 Woodbury, East Over- cliffe Drive, Bournemouth, Dorset, do hereby declare the invention for which I pray that a patent may be granted to me and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to structural panels and has for its object the provision of a structural panel suitable for a wide range of uses. e.g. in walls, roofs and doors, and in place of glazing.
According to the present invention. a structural panel comprises a corrugated perforate metallic interstructure between a pair of spaced layers of glass-fibre reinforced plastics (G.R.P.), with the layers united to the peaks of the corrugations.
The amplitude of the corrugations is the principal factor determining the overall thickness of the panel, although the thickness of the G.R.P. layers will have a bearing on this, while the perforate nature of the interstructure affords a reduction in its weight (additional to that afforded by the cellular-like formation created b the corrugated metal between the G.R.. layers as compared with a solid panel of like thickness) without detracting appreciably from its load-bearing capacity. The G.R.P. layers afford strength at the surfaces of the panel, as well as combining with the corrugated perforate metallic interstructure to afford rigidity.The corrugated perforate metallic interstructure, which may be corrugated expanded metal or welded wire mesh, is preferably formed of corrugated perforated aluminium to assist further in affording light weight.
Thus a panel in accordance with the invention can be used in a wall or roof without any additional structural members, and may be used as a door panel. However, a particularly advantageous aspect of the invention, arising out of the provision of the perforations (or interstices of a mesh) is that by using G.R.P. layers of a transparent or (more probably) translucent nature, a panel as defined above is capable of transmitting light. The cellular-like formation mentioned above does, furthermore, afford insulation, which may be enhanced by sealing the edges of the panel and evacuating its interior.
The corrugations may be sinusoidal, but they are preferably saw-tooth in profile as the peaks are particularly adapted to uniting with the G.R.P. layers by pressing the peaks into the layers while the latter are still at the gel stage. According to another aspect of the invention, therefore, a method of forming a structural panel comprises laying up a first layer of glass-fibre reinforced plastics on a mould plate, pressing to that layer while still at the gel stage a corrugated perforate metallic interstructure. removing from the mould and allowing to cure, laying up a second layer of glass-fibre reinforced plastics on a mould plate, pressing to the second layer while still at the gel stage the side of the corrugated perforate metallic interstructure remote from the first layer, and removing from the mould and allowing to cure.
The mould plate is preferably formed of or surfaced with highly polished glass, or some other material not requiring a release agent for the G.R.P. but the mould plate may be provided with a contoured surface for producing a complementary surface on the G.R.P. layer, if desired; in which case a release agent would probably be necessary.
According to a particularly advantageous feature of the invention, the corrugated perforate metallic interstructure may be painted black (or other suitable dark colour) on one side only intended to be disposed towards the outside of the panel, and the layers are formed of a transparent or translucent glass-fibre reinforced plastics, so as to form a solar lens or solar cell.
However, it has been found by experiment that a panel in accordance wifh the basic concept of the invention used in place of conventional greenhouse glazing has a beneficial effect on plants grown or cultivated thereunder.
Panels in accordance with the invention can be incorporated in buildings in various ways. For example, each panel may have its edges embraced by channel section mem hers, and adjoining panels may have their channel section members overlapped by beading (e.g. of half-round section) with bolts between the beadings on the two sides of the panels so that the beadings serve to clamp the panels together. A panel intended to serve as a roof light and/or solar cell may be mounted in a sliding frame on a roof so as to be capable of sliding to open position for ventilation purposes. A panel intended for incorporation in a door may have translucent or opaque G.R.P. layers. which may be coloured so as to be attractive from both inside and out, and a panel intended for use in a wall may likewise have translucent or opaque and coloured layers.
A number of embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which Figure 1 is a perspective view of a panel in accordance with the invention Figure 2 is an enlargement of part of Figure 1; Figures 3 and 4 correspond to Figure 2 but show alternative forms of corrugated perforate metallic interstructure; and Figures 5 to 8 are diagrammatic sections showing a method of forming a structural panel as in any of the preceding Figures.
In Figures 1 and 2 a structural panel comprises a corrugated perforate metallic interstructure 10, formed of corrugated perforated aluminium 11, between a pair of spaced layers 12A, 12B of glass-fibre reinforced plastics (G.R.P.), with the layers united to the peaks 13 of the corrugations.
In Figure 3 the corrugated perforate metallic interstructure 10 is formed of corrugated expanded metal 14, while in Figure 4 it is formed of corrugated welded wire mesh 15.
In Figures 5 to 8, showing a method of forming a structural panel as in any of the preceding Figures, a first layer l 2A of G.R.P. is laid up on a highly polished glass mould plate 16 in a mould (Figure s). a corrugated perforate metallic interstructure 10 is pressed to that layer while still at the gel stage (Figure 6), the layer 12A (with the corrugated perforate metallic interstructure adhering thereto) is removed from the mould and allowed to curc, a second layer 12B of G.R.P. is laid up in the mould 17 (Figure 7), the side of the corrugated perfo rate metallic insterstructure I 10 remote from the layer 12A is pressed to the layer 12B while still at the gel stage (Figure 8), and the layer 1 2B (with the corrugated perforate metallic interstructure adhering thereto) is removed from the mould and allowed to cure.
WHAT WE CLAIM IS: 1. A structural panel comprising a corrugated perforate metallic interstructure between a pair of spaced layers of glass-fibre reinforced plastics with the layers united to the peaks of the corrugations.
2. A panel as in Claim 1, wherein the corrugated perforate metallic interstructure is corrugated expanded metal.
3. A panel as in Claim 1, wherein the corrugated perforate metallic interstructure is corrugated welded wire mesh.
4. A panel as in Claim 1, wherein the corrugated perforate metallic interstructure is corrugated perforated aluminium.
5. A panel as in any one of the preceding Claims. wherein the edges of the panel are sealcd and its intcrior is evacuated.
6. A panel as in any one of the preceding Claims, wherein the corrugations are sinusoidal.
7. A panel as in any one of Claims 1 to 5, wherein the corrugations are saw-tooth in profile.
8. A panel as in any one of the preceding Claims, wherein the corrugated perforate metallic interstructure is painted black on one side only, and the layers are each formed of a transparent or translucent glass-fibre reinforced plastics.
9. A method of forming a structural panel comprising laying up a first layer of glass-fibre reinforced plastics on a mould plate, pressing to that layer while still at the gel stage a corrugated perforate metallic interstructure, removing from the mould and allowing to cure, laying up a second layer of glass-fibre reinforced plastics on a mould plate, pressing to the second layer while still at the gel stage the side of the corrugated perforate metallic interstructure remote from the first layer. and removing from the mould and allowing to cure.
10. A method as in Claim 9. wherein the mould plate is formed of or surfaced with highly polished glass. or some other material not requiring a release agent.
11. A method as in Claim 9, wherein the mould plate is provided with a contoured surface for producing a complementary surface on the layer.
12. A structural panel substantially as hereinbefore described with reference to Figures 1 and 2 of the accompanying draw ings or with the alternative corrugated perforate metallic interstructure of Figure 3 or
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (14)

**WARNING** start of CLMS field may overlap end of DESC **. hers, and adjoining panels may have their channel section members overlapped by beading (e.g. of half-round section) with bolts between the beadings on the two sides of the panels so that the beadings serve to clamp the panels together. A panel intended to serve as a roof light and/or solar cell may be mounted in a sliding frame on a roof so as to be capable of sliding to open position for ventilation purposes. A panel intended for incorporation in a door may have translucent or opaque G.R.P. layers. which may be coloured so as to be attractive from both inside and out, and a panel intended for use in a wall may likewise have translucent or opaque and coloured layers. A number of embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which Figure 1 is a perspective view of a panel in accordance with the invention Figure 2 is an enlargement of part of Figure 1; Figures 3 and 4 correspond to Figure 2 but show alternative forms of corrugated perforate metallic interstructure; and Figures 5 to 8 are diagrammatic sections showing a method of forming a structural panel as in any of the preceding Figures. In Figures 1 and 2 a structural panel comprises a corrugated perforate metallic interstructure 10, formed of corrugated perforated aluminium 11, between a pair of spaced layers 12A, 12B of glass-fibre reinforced plastics (G.R.P.), with the layers united to the peaks 13 of the corrugations. In Figure 3 the corrugated perforate metallic interstructure 10 is formed of corrugated expanded metal 14, while in Figure 4 it is formed of corrugated welded wire mesh 15. In Figures 5 to 8, showing a method of forming a structural panel as in any of the preceding Figures, a first layer l 2A of G.R.P. is laid up on a highly polished glass mould plate 16 in a mould (Figure s). a corrugated perforate metallic interstructure 10 is pressed to that layer while still at the gel stage (Figure 6), the layer 12A (with the corrugated perforate metallic interstructure adhering thereto) is removed from the mould and allowed to curc, a second layer 12B of G.R.P. is laid up in the mould 17 (Figure 7), the side of the corrugated perfo rate metallic insterstructure I 10 remote from the layer 12A is pressed to the layer 12B while still at the gel stage (Figure 8), and the layer 1 2B (with the corrugated perforate metallic interstructure adhering thereto) is removed from the mould and allowed to cure. WHAT WE CLAIM IS:
1. A structural panel comprising a corrugated perforate metallic interstructure between a pair of spaced layers of glass-fibre reinforced plastics with the layers united to the peaks of the corrugations.
2. A panel as in Claim 1, wherein the corrugated perforate metallic interstructure is corrugated expanded metal.
3. A panel as in Claim 1, wherein the corrugated perforate metallic interstructure is corrugated welded wire mesh.
4. A panel as in Claim 1, wherein the corrugated perforate metallic interstructure is corrugated perforated aluminium.
5. A panel as in any one of the preceding Claims. wherein the edges of the panel are sealcd and its intcrior is evacuated.
6. A panel as in any one of the preceding Claims, wherein the corrugations are sinusoidal.
7. A panel as in any one of Claims 1 to 5, wherein the corrugations are saw-tooth in profile.
8. A panel as in any one of the preceding Claims, wherein the corrugated perforate metallic interstructure is painted black on one side only, and the layers are each formed of a transparent or translucent glass-fibre reinforced plastics.
9. A method of forming a structural panel comprising laying up a first layer of glass-fibre reinforced plastics on a mould plate, pressing to that layer while still at the gel stage a corrugated perforate metallic interstructure, removing from the mould and allowing to cure, laying up a second layer of glass-fibre reinforced plastics on a mould plate, pressing to the second layer while still at the gel stage the side of the corrugated perforate metallic interstructure remote from the first layer. and removing from the mould and allowing to cure.
10. A method as in Claim 9. wherein the mould plate is formed of or surfaced with highly polished glass. or some other material not requiring a release agent.
11. A method as in Claim 9, wherein the mould plate is provided with a contoured surface for producing a complementary surface on the layer.
12. A structural panel substantially as hereinbefore described with reference to Figures 1 and 2 of the accompanying draw ings or with the alternative corrugated perforate metallic interstructure of Figure 3 or
Figure 4 of the accompanying drawings.
13. A method of forming a structural panel substantially as hereinbefore described with reference to Figures 5 to 8 of the accompanying drawings.
14. Structural panels incorporated in buildings as hereinbefore described.
GB28204/76A 1977-10-07 1977-10-07 Structural panels Expired GB1589715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB28204/76A GB1589715A (en) 1977-10-07 1977-10-07 Structural panels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB28204/76A GB1589715A (en) 1977-10-07 1977-10-07 Structural panels

Publications (1)

Publication Number Publication Date
GB1589715A true GB1589715A (en) 1981-05-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB28204/76A Expired GB1589715A (en) 1977-10-07 1977-10-07 Structural panels

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123744A (en) * 1982-07-13 1984-02-08 Fabco Ind Ltd Improvements in and relating to the moulding of materials
WO1991017885A1 (en) * 1990-05-21 1991-11-28 Glasis Ab Laminate and method for production thereof
GB2245523A (en) * 1990-06-19 1992-01-08 Team Consulting Ltd Composite materials
DE4430428A1 (en) * 1994-08-26 1996-02-29 Bayerische Motoren Werke Ag Laminated body with sheet metal cover for car body outer skin parts
EP0744510A1 (en) * 1995-05-24 1996-11-27 Sto Verotec GmbH Structural panel of metal
FR2767660A1 (en) * 1997-09-02 1999-03-05 Chenel Guy G Display divider panels
US6079172A (en) * 1997-09-02 2000-06-27 Chenel; Guy Gilbert Dividing element in panel form to produce partitions and presentation facilities for temporary displays
EP1273731A3 (en) * 2001-07-04 2003-11-12 Francesco Donati A composite panel, having synthetic material surfaces, for making furniture pieces
DE102006050823A1 (en) * 2006-10-27 2008-05-08 Audi Ag Manufacturing method for composite structure, particularly multilevel composite structure, involves applying fiber layer on support structure and inserting filing unit in cavity of structure and injecting matrix material into fiber layer
EP3257667A1 (en) * 2016-06-14 2017-12-20 United Technologies Corporation Structural panel with woven element core

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123744A (en) * 1982-07-13 1984-02-08 Fabco Ind Ltd Improvements in and relating to the moulding of materials
WO1991017885A1 (en) * 1990-05-21 1991-11-28 Glasis Ab Laminate and method for production thereof
GB2245523A (en) * 1990-06-19 1992-01-08 Team Consulting Ltd Composite materials
DE4430428A1 (en) * 1994-08-26 1996-02-29 Bayerische Motoren Werke Ag Laminated body with sheet metal cover for car body outer skin parts
DE4430428B4 (en) * 1994-08-26 2005-12-01 Bayerische Motoren Werke Ag layer body
EP0744510A1 (en) * 1995-05-24 1996-11-27 Sto Verotec GmbH Structural panel of metal
US6079172A (en) * 1997-09-02 2000-06-27 Chenel; Guy Gilbert Dividing element in panel form to produce partitions and presentation facilities for temporary displays
FR2767660A1 (en) * 1997-09-02 1999-03-05 Chenel Guy G Display divider panels
EP1273731A3 (en) * 2001-07-04 2003-11-12 Francesco Donati A composite panel, having synthetic material surfaces, for making furniture pieces
DE102006050823A1 (en) * 2006-10-27 2008-05-08 Audi Ag Manufacturing method for composite structure, particularly multilevel composite structure, involves applying fiber layer on support structure and inserting filing unit in cavity of structure and injecting matrix material into fiber layer
DE102006050823B4 (en) * 2006-10-27 2015-03-12 Audi Ag Composite component and method for its production
EP3257667A1 (en) * 2016-06-14 2017-12-20 United Technologies Corporation Structural panel with woven element core
US10800134B2 (en) 2016-06-14 2020-10-13 Raytheon Technologies Corporation Structural panel with woven element core
US11565496B2 (en) 2016-06-14 2023-01-31 Raytheon Technologies Corporation Structural panel with woven element core

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee