US3416272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin pre-stressed concrete slab
Assignee: Flexicore Co Inc
•
Filing: 1967-01-16
•
Granted: 1968-12-17
•
Expires: 1987-01-16
Abstract
No abstract record available.
Inventors
- 👤 Gue David J La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:00
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2346263A
Cited
US2542992A
Cited
GB693287A
Cited
AT177242B
Cited
GB751847A
Cited
GB748104A
Cited
GB940124A
Cited
US3172932A
Cited
US3283457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-17 | 1972-06-17 | 1972-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-17 | 1976-06-17 | 1976-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-17 | 1980-06-17 | 1980-12-17 | $7700.00 | Window Closed / Lapsed |