Patent US3835607A successfully refreshed from Google Patents.
US3835607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced girders of steel and concrete
Assignee: Individual
•
Filing: 1972-04-13
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Granted: 1974-09-17
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Expires: 1992-04-13
Abstract
Abstract The invention relates to a reinforced girder, in particular of steel and concrete, in which the concrete is prestressed to avoid cracks being formed therein due to tensile stresses. The invention also discloses a method for the production of such girders.
Inventors
- 👤 N Raaber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:04
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/29; E04C3/293; E04C3/294
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
Reinforced girder construction comprising: a nonpre-stressed steel girder of elongated configuration having a principal axis, said girder having first and second ends, and a pre-stressed concrete reinforcing member interconnected to said steel girder solely at said first and second ends thereof, said reinforcing member being slidably related to said girder therebetween.
Claim 2
Dependent Claim
51 words
Reinforced girder construction comprising: a nonpre-stressed steel girder of elongated configuration having a principal axis, said girder having first and second ends, and a pre-stressed concrete reinforcing member interconnected to said steel girder solely at said first and second ends thereof, said reinforcing member being slidably related to said girder therebetween.
Claim 3
Dependent Claim
24 words
Structure in accordance with claim 1, said steel girder including at least one laterally extending flange, said reinforcing member exerting a compressive force thereon.
Claim 4
Dependent Claim
54 words
Structure in accordance with claim 1, said concrete reinforcing member including an elongated section of concrete, and a steel tendon extending through said section of concrete, stress blocks at each end of said concrete section, said tendon extending through said stress blocks, and threaded means on the ends thereof for tightening said blocks thereagainst.
References Cited (Backward Citations)
CA675943A
Cited
AT179887B
Cited
FR1048852A
Cited
AU164961A
Cited
US3140764A
Cited
US3407554A
Cited
US3385015A
Cited
US3457687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |