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Patent US808378A successfully refreshed from Google Patents.
US808378A
Expired / Lapsed
US
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Automatic rotary hydraulic casing-spear.
Assignee: Individual
•
Filing: 1905-05-19
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Granted: 1905-12-26
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Expires: 1925-05-19
Abstract
No abstract record available.
Inventors
- 👤 Horace G Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:46
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/12; E21B31/18
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) | 1908-12-25 | 1909-06-26 | 1909-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1912-12-25 | 1913-06-26 | 1913-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1916-12-25 | 1917-06-26 | 1917-12-26 | $7700.00 | Window Closed / Lapsed |