US2790625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Under-reamers
Assignee: Individual
•
Filing: 1950-12-12
•
Granted: 1957-04-30
•
Expires: 1970-12-12
Abstract
No abstract record available.
Inventors
- 👤 Charles A Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:10
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/32; E21B10/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US631423A
Cited
US1091502A
Cited
US1478306A
Cited
US1489674A
Cited
US1774764A
Cited
US2049450A
Cited
US2409811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |