Patent US811404A successfully refreshed from Google Patents.
US811404A
Expired / Lapsed
US
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Apparatus for erecting tunnels.
Assignee: S PEARSON AND SON Inc
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Filing: 1905-09-21
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Granted: 1906-01-30
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Expires: 1925-09-21
Abstract
No abstract record available.
Inventors
- 👤 Henry Japp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:27
CPC Classifications
E; E21; E21D; E21D9/00; E21D9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1909-01-29 | 1909-07-31 | 1910-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1913-01-29 | 1913-07-31 | 1914-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1917-01-29 | 1917-07-31 | 1918-01-30 | $7700.00 | Window Closed / Lapsed |