US2631389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsoil tunnel forming device
Assignee: S AND S Manufacturing CO
•
Filing: 1949-06-27
•
Granted: 1953-03-17
•
Expires: 1969-06-27
Abstract
No abstract record available.
Inventors
- 👤 Floyd I Stovall
- 👤 Symmonds Bert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:42
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/02; E02F5/12; E02F5/10; E02F5/102
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US25649A
Cited
US29269A
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US189667A
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FR395399A
Cited
US1373374A
Cited
US1314279A
Cited
US1475879A
Cited
US1840939A
Cited
US2139306A
Cited
US2501062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |