Patent US3143781A successfully refreshed from Google Patents.
US3143781A
Expired / Lapsed
US
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Concrete slab forming machine
Assignee: Individual
•
Filing: 1961-02-13
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Granted: 1964-08-11
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Expires: 1981-02-13
Abstract
No abstract record available.
Inventors
- 👤 Kalns Arvids
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:28
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/08; B28B1/084; B28B1/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US260533A
Cited
US2734248A
Cited
US1075877A
Cited
US1606160A
Cited
US1559500A
Cited
GB713256A
Cited
US2987793A
Cited
US2938255A
Cited
DE1036743B
Cited
US2948942A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |