Patent US1547461A successfully refreshed from Google Patents.
US1547461A
Expired / Lapsed
US
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Method and apparatus for drilling wells
Assignee: Individual
•
Filing: 1924-02-05
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Granted: 1925-07-28
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Expires: 1944-02-05
Abstract
No abstract record available.
Inventors
- 👤 Hampton A Steele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:53
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/02; E21B10/04; E21B21/00; E21B21/12
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) | 1928-07-27 | 1929-01-26 | 1929-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-07-27 | 1933-01-26 | 1933-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-07-27 | 1937-01-26 | 1937-07-28 | $7700.00 | Window Closed / Lapsed |