US2709071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydro-gear retrieving feed apparatus for rotary drilling
Assignee: Individual
•
Filing: 1949-12-03
•
Granted: 1955-05-24
•
Expires: 1969-12-03
Abstract
No abstract record available.
Inventors
- 👤 Frederic W Hild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:17
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/084
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2003078A
Cited
US1830941A
Cited
US1859814A
Cited
US1954176A
Cited
US2136356A
Cited
US2365443A
Cited
US2297644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |