Patent US1656471A successfully refreshed from Google Patents.
US1656471A
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US
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Deep-well-drilling apparatus
Assignee: Reed Roller Bit Co
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Filing: 1926-12-06
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Granted: 1928-01-17
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Expires: 1946-12-06
Abstract
No abstract record available.
Inventors
- 👤 William L Childs
- 👤 Guy E Behnke
- 👤 Duda Oswald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:21
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/10
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) | 1931-01-16 | 1931-07-18 | 1932-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-01-16 | 1935-07-18 | 1936-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-01-16 | 1939-07-18 | 1940-01-17 | $7700.00 | Window Closed / Lapsed |