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US2931439A
Expired / Lapsed
US
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Float shoe
Assignee: Individual
•
Filing: 1956-12-17
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Granted: 1960-04-05
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Expires: 1976-12-17
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:27
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10; E21B2200/00; E21B2200/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2592325A
Cited
US2630178A
Cited
US2642140A
Cited
US2717647A
Cited
US2812820A
Cited
US2812821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |