US3760549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Construction element
Assignee: Individual
•
Filing: 1971-11-19
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Granted: 1973-09-25
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Expires: 1991-11-19
Abstract
Abstract A load-supporting construction element, for spanning a pair of spaced-apart supports and adapted to form a wall, floor, deck or roofing structure or a support for a wall, floor, deck or roofing surface which consists of a sheet-metal plate of generally rectangular-plan configuration and a plurality of troughs and crests in alternating relationship and of trapezoidal crosssection. The apices of the troughs and/or crests are provided with integral (unitary) ridges concave in the direction in which the corrugation bulges and of trapezoidal or arcuate crosssection. The flanks of the trapezoidal corrugations are stepped.
Inventors
- 👤 W Silberkuhl
- 👤 H Manthey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:23
CPC Classifications
E; E04; E04D; E04D3/00; E04D3/24; E04C; E04C2/00; E04C2/30; E04C2/32; E04C2/322
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
125 words
A construction element which comprises a generally planar plate of rectangular plan configuration unitarily formed with alternately upwardly and downwardly bulging corrugation of generally trapezoidal cross-section, said corrugations being formed with generally flat flanks converging to flattened crests and troughs respectively, said flanks being formed with longitudinally extending steps and said crests and troughs being formed unitarily with longitudinally extending rib profiles deformed therein and concave in the direction in which the respective corrugation bulges, said corrugations having altitudes approximately equal to the transverse widths of said flattened troughs and crests, said steps being formed substantially midway along said flanks, and said flanks including angles of about 115* with said flattened troughs and crestd and said steps include angles of substantially 145* with said flanks.
Claim 2
Dependent Claim
125 words
A construction element which comprises a generally planar plate of rectangular plan configuration unitarily formed with alternately upwardly and downwardly bulging corrugation of generally trapezoidal cross-section, said corrugations being formed with generally flat flanks converging to flattened crests and troughs respectively, said flanks being formed with longitudinally extending steps and said crests and troughs being formed unitarily with longitudinally extending rib profiles deformed therein and concave in the direction in which the respective corrugation bulges, said corrugations having altitudes approximately equal to the transverse widths of said flattened troughs and crests, said steps being formed substantially midway along said flanks, and said flanks including angles of about 115* with said flattened troughs and crestd and said steps include angles of substantially 145* with said flanks.
Claim 3
Dependent Claim
23 words
The element defined in claim 1 wherein said rib profiles are provided substantially in the middle of the respective flattened trough and crest.
Claim 4
Dependent Claim
20 words
The element defined in claim 1 wherein said rib profiles extend approximately over a quadrant of a circle in cross-section.
Claim 5
Dependent Claim
32 words
The element defined in claim 3 wherein the rib profiles on the upwardly bulging corrugations are of arcuate cross-section and the rib profiles on the downwardly bulging corrugations are of trapezoidal cross-section.
Claim 6
Dependent Claim
88 words
The element defined in claim 4 wherein said flattened crests and troughs have transverse widths A and D respectively, said corrugations have altitudes H, said rib profiles have widths B and E for the arcuate and trapezoidal cross-sections respectively, and respective altitudes F and G and said corrugations have broad bases of widths C, the values A, B, C, D, E, F and G being related as follows: A/2 < or = B about E < or = A/4, C about 2A about 2D, and B/2 about E/2.
Claim 7
Dependent Claim
14 words
The element defined in claim 5 wherein F about G about B/3 about E/3.
Claim 8
Dependent Claim
10 words
The element defined in claim 6 wherein B about A/3.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |