Patent US4453357A successfully refreshed from Google Patents.
US4453357A
Expired / Lapsed
US
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Wall structure, wall element for use in the wall structure and method for making the same
Assignee: Sentralinstitutt for Industriell Forskning
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Filing: 1980-04-16
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Granted: 1984-06-12
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Expires: 2000-04-16
Abstract
Abstract A wall structure for vessels, tanks, washing towers, tubes, boat hulls and the like can be manufactured from elements consisting of a core of rigid plastic foam which on a first side is coated with a layer of non-expanded plastic which adheres to the core and preferably is of the same type as the latter, whereas the core is exposed on the opposite side. The elements have an elongated plank-like shape with opposite side surfaces having respective groove-and tongue-like design for matching mutual engagement. They can be rigidly engaged in side-by-side relationship by welding and/or gluing. On an exposed face of the assembled elements, a reinforced plastic mass which sets into a continuous layer is applied, if desired after grinding for evening out irregularities.
Inventors
- 👤 Dagfinn Zwilgmeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:55
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/30; E04C2/40; E04C2/405; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249985
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
24 words
A wall structure which can be used to construct objects such as vessels, tanks, washing towers, tubes and boat hulls, said wall structure comprising
Claim 2
Dependent Claim
24 words
A wall structure which can be used to construct objects such as vessels, tanks, washing towers, tubes and boat hulls, said wall structure comprising
Claim 3
Dependent Claim
163 words
a multiplicity of separate, interengageable elongated wall elements, each of said elongated wall elements consisting of (a) an elongated core of expanded hard plastic and having an upper and a lower surface and opposite side surfaces, the side surfaces of each core being shaped to provide for engagement with other of said elongated wall elements adjacent thereto, and (b) a separate layer of non-expanded plastic integrally adhered by coextrusion to said core over at least its upper surface, but not its lower surface; said elongated wall elements being positioned side-to-side so as to be engaged with one another and are also adhered together, the layers of non-expanded plastic on the upper surfaces of said elongated wall elements forming a smooth but discontinuous first outer surface of said wall structure, and a single layer of reinforced plastic adhered directly to the lower surfaces of all said engaged elongated wall elements, said single layer forming a smooth, continuous second outer surface of said wall structure.
Claim 4
Dependent Claim
163 words
a multiplicity of separate, interengageable elongated wall elements, each of said elongated wall elements consisting of (a) an elongated core of expanded hard plastic and having an upper and a lower surface and opposite side surfaces, the side surfaces of each core being shaped to provide for engagement with other of said elongated wall elements adjacent thereto, and (b) a separate layer of non-expanded plastic integrally adhered by coextrusion to said core over at least its upper surface, but not its lower surface; said elongated wall elements being positioned side-to-side so as to be engaged with one another and are also adhered together, the layers of non-expanded plastic on the upper surfaces of said elongated wall elements forming a smooth but discontinuous first outer surface of said wall structure, and a single layer of reinforced plastic adhered directly to the lower surfaces of all said engaged elongated wall elements, said single layer forming a smooth, continuous second outer surface of said wall structure.
Claim 5
Dependent Claim
21 words
The wall structure of claim 1, wherein the cores of each of the elongated wall elements have generally rectangular cross sections.
Claim 6
Dependent Claim
32 words
The wall structure of claim 1, wherein one side of the core of each wall element is shaped to include a tongue and the opposite side is shaped to include a groove.
Claim 7
Dependent Claim
22 words
The wall structure of claim 1, wherein said layer of non-expanded plastic is also attached to each core along the opposite sides.
Claim 8
Dependent Claim
15 words
The wall structure of claim 1, wherein said wall elements are adhered together with welds.
Claim 9
Dependent Claim
15 words
The wall structure of claim 1, wherein said wall elements are adhered together with glue.
Claim 10
Dependent Claim
18 words
The wall structure of claim 1, wherein the core and the layer of non-expanded plastic are glued together.
Claim 11
Dependent Claim
20 words
The wall structure of claim 1, wherein at least some of said wall elements are curved in their elongated dimension.
Claim 12
Dependent Claim
43 words
The wall structure of claim 1, wherein said core is composed of expanded PVC, said non-expanded plastic is non-expanded PVC, and said reinforced plastic in said continuous layer is selected from the group consisting of glass-fiber-reinforced polyester resin and glass fiber-reinforced epoxy resin.
Claim 13
Dependent Claim
87 words
A wall element which can be used in forming a wall structure, said wall element consisting of (a) an elongated core of expanded hard plastic having an upper and a lower surface and opposite side surfaces, the opposite side surfaces of the core being shaped to provide for engagement with other wall elements, and (b) a separate layer of non-expanded plastic, said layer of non-expanded plastic being integrally adhered by coextrusion to said cover over at least its said upper surface but not its said lower surface.
Claim 14
Dependent Claim
87 words
A wall element which can be used in forming a wall structure, said wall element consisting of (a) an elongated core of expanded hard plastic having an upper and a lower surface and opposite side surfaces, the opposite side surfaces of the core being shaped to provide for engagement with other wall elements, and (b) a separate layer of non-expanded plastic, said layer of non-expanded plastic being integrally adhered by coextrusion to said cover over at least its said upper surface but not its said lower surface.
Claim 15
Dependent Claim
15 words
The wall element of claim 10, wherein said core has a generally rectangular cross section.
Claim 16
Dependent Claim
28 words
The wall element of claim 10, wherein one side of the core is shaped to include a tongue and the opposite side is shaped to include a groove.
Claim 17
Dependent Claim
22 words
The wall element of claim 10, wherein said layer of non-expanded plastic is also adhered to the opposite sides of the core.
Claim 18
Dependent Claim
18 words
The wall element of claim 10 wherein the core and the layer of non-expanded plastic are glued together.
Claim 19
Dependent Claim
14 words
The wall element of claim 10, wherein it is curved in its elongated dimension.
Claim 20
Dependent Claim
20 words
The wall element of claim 10, wherein said core is composed of expanded PVC, said non-expanded plastic is non-expanded PVC.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |