US2800303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drilling tool
Assignee: Ingersoll Rand Co
•
Filing: 1953-05-12
•
Granted: 1957-07-23
•
Expires: 1973-05-12
Abstract
No abstract record available.
Inventors
- 👤 George M Dick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:29
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/36; E21B10/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE20468E
Cited
US1476481A
Cited
US1444305A
Cited
US2103359A
Cited
US2201570A
Cited
GB652562A
Cited
US2557835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |