US1851319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of diverting alpha well drilling tool
Assignee: BLACKWELL AND SUNDE BETTER SUR
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Filing: 1930-10-17
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Granted: 1932-03-29
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Expires: 1950-10-17
Abstract
No abstract record available.
Inventors
- 👤 Archie G Mccoy
- 👤 Benjamin W Sunde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:22
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02; E21B47/024
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) | 1935-03-29 | 1935-09-28 | 1936-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-03-29 | 1939-09-28 | 1940-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-03-29 | 1943-09-28 | 1944-03-29 | $7700.00 | Window Closed / Lapsed |