US3296754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shell structure for concrete construction
Assignee: Individual
•
Filing: 1963-11-22
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Granted: 1967-01-10
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Expires: 1983-11-22
Abstract
No abstract record available.
Inventors
- 👤 Silberkuhl Wilhelm Johannes
- 👤 Kastl Uwe
- 👤 Haeussler Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:54
CPC Classifications
E; E04; E04B; E04B7/00; E04B7/08; E04B7/10; E04B7/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A STRUCTURE ADAPTED TO BE USED IN ROOF CONSTRUCTION AND THE LIKE, COMPRISING A CONCRETE SHELL OF SUBSTANTIALLY RECTANGULAR HORIZONTAL OUTLINE WITH UPWARDLY ARCHED LONGITUDINALLY EDGES AT THE LONGER SIDES OF THE RECTANGLE, SAID SHELL BEING OF UPWARDLY CONCAVE TRANSVERSE CURVATURE AT LEAST OVER THE MAJOR PART OF ITS SURFACE AND HAVING A SUBSTANTIALLY CRESCENT-SHAPED CENTRAL CROSS-SECTION, AND REINFORCING MEANS IMBEDDED WITHIN THE BODY OF SAID SHELL, SAID SHELL HAVING A LOW CENTER OF GRAVITY AND BEING SUBSTANTIALLY FREE FROM EDGE TORQUES IN THE REGION OF SAID CENTRAL CROSS-SECTION.
Claim 2
Dependent Claim
89 words
A STRUCTURE ADAPTED TO BE USED IN ROOF CONSTRUCTION AND THE LIKE, COMPRISING A CONCRETE SHELL OF SUBSTANTIALLY RECTANGULAR HORIZONTAL OUTLINE WITH UPWARDLY ARCHED LONGITUDINALLY EDGES AT THE LONGER SIDES OF THE RECTANGLE, SAID SHELL BEING OF UPWARDLY CONCAVE TRANSVERSE CURVATURE AT LEAST OVER THE MAJOR PART OF ITS SURFACE AND HAVING A SUBSTANTIALLY CRESCENT-SHAPED CENTRAL CROSS-SECTION, AND REINFORCING MEANS IMBEDDED WITHIN THE BODY OF SAID SHELL, SAID SHELL HAVING A LOW CENTER OF GRAVITY AND BEING SUBSTANTIALLY FREE FROM EDGE TORQUES IN THE REGION OF SAID CENTRAL CROSS-SECTION.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |