Patent US4665678A successfully refreshed from Google Patents.
US4665678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight constructions of increased strength and dimensional stability
Assignee: Bayer AG
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Filing: 1985-02-22
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Granted: 1987-05-19
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Expires: 2005-02-22
Abstract
Abstract A lightweight construction with sandwich elements consisting of core and covering surfaces may be produced in that high-strength hollow profiles are fixed to a molded frame at a spacing from each other, the remaining space around the hollow profiles is filled with a pressure-resistant casting compound which supports the profiles, and the top layers which determine the bending resistance of the elements are applied thereto. In this manner multidimensionally curved covering surfaces of unlimited size, such as the bodies of boats, can be economically produced.
Inventors
- 👤 Hans Muller
- 👤 Lothar Preis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:38
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/10; B32B3/18; B32B3/20; B32B1/00; B32B1/08; B32B5/00; B32B5/22; B32B5/24; B32B5/26; E; E04; E04C; E04C2/00; E04C2/02; E04C2/26; E04C2/30; E04C2/32; E04C2/328; B32B2307/00; B32B2307/50; B32B2307/54; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24744
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A wall element for use in the production of three dimensional curved walls and having a sandwich structure comprising a core and two covering surfaces, wherein the core comprises hollow cylindrical tubular profiles having a tube axis and good resistance to tensile stress and which are spaced apart a minimum of 2 mm, wherein the remaining space in the core around the hollow profiles is filled with a pressure-resistance casting compound which supports the profiles, wherein the tubes consist of monodirectional glass fiber strands oriented in the direction of the tube axis and embedded in unsaturated polyester resin and which are wrapped by monodirectional glass fiber strands oriented perpendicular to the tube axis and wherein the covering surfaces are identical and are connected directly to the profiles by the casting compound.
Claim 2
Dependent Claim
131 words
A wall element for use in the production of three dimensional curved walls and having a sandwich structure comprising a core and two covering surfaces, wherein the core comprises hollow cylindrical tubular profiles having a tube axis and good resistance to tensile stress and which are spaced apart a minimum of 2 mm, wherein the remaining space in the core around the hollow profiles is filled with a pressure-resistance casting compound which supports the profiles, wherein the tubes consist of monodirectional glass fiber strands oriented in the direction of the tube axis and embedded in unsaturated polyester resin and which are wrapped by monodirectional glass fiber strands oriented perpendicular to the tube axis and wherein the covering surfaces are identical and are connected directly to the profiles by the casting compound.
Claim 3
Dependent Claim
28 words
An element according to claim 1, wherein the resistance to tensile stress of the hollow profiles is at least 1000 N/mm 2 , based on the bearing cross-section.
Claim 4
Dependent Claim
22 words
An element according to claim 2, wherein the resistance to compression of the casting compound is at least 15 N/mm 2 .
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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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |