Patent US3712010A successfully refreshed from Google Patents.
US3712010A
Expired / Lapsed
US
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Prestressed metal and concrete composite structure
Assignee: Iowa State University Research Foundation Inc
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Filing: 1970-08-17
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Granted: 1973-01-23
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Expires: 1990-08-17
Abstract
Abstract A prestressed form of lightweight metal construction which is adapted to be supported between beams and which is adapted to support a poured concrete floor or the like. The form is prestressed by means of tendons attached at the ends thereof and at various points along the length of the form. The prestressing of the forms provides a means of cambering the forms which offset the deflection due to the dead load imposed thereon. The prestressed form and the concrete supported thereby cooperate compositely to resist live loading.
Inventors
- 👤 M Porter
- 👤 C Ekberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:36
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/16; E04B5/32; E04B5/36; E04B5/38; E04B5/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
In a concrete structure, a plurality of elongated metal sheet members having opposite ends, a plurality of spaced apart tendon rods secured at their opposite ends to the opposite ends of said sheet members and stressing said sheet members to cause said sheet member to be normally cambered, concrete material on said sheet member, said concrete material holding said cambered sheet members in a position at least partially straightened with respect to said normal cambered position, said sheet members having a plurality of alternate ridges and grooves formed therein extending between said opposite ends, said rods being mounted in said grooves, said sheet member having foldable flap elements at the ends of said grooves, said flap elements being folded upon themselves, the opposite ends of said rods extending through and being detachably secured to said folded flap elements.
Claim 2
Dependent Claim
138 words
In a concrete structure, a plurality of elongated metal sheet members having opposite ends, a plurality of spaced apart tendon rods secured at their opposite ends to the opposite ends of said sheet members and stressing said sheet members to cause said sheet member to be normally cambered, concrete material on said sheet member, said concrete material holding said cambered sheet members in a position at least partially straightened with respect to said normal cambered position, said sheet members having a plurality of alternate ridges and grooves formed therein extending between said opposite ends, said rods being mounted in said grooves, said sheet member having foldable flap elements at the ends of said grooves, said flap elements being folded upon themselves, the opposite ends of said rods extending through and being detachably secured to said folded flap elements.
Claim 3
Dependent Claim
19 words
The structure of claim 1 wherein said rods are also secured to said sheet members intermediate the ends thereof.
Claim 4
Dependent Claim
20 words
The structure of claim 1 wherein said rods are also secured to said sheet members midway between the ends thereof.
References Cited (Backward Citations)
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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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |