US2937619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hole cleaning device
Assignee: Ingersoll Rand Co
•
Filing: 1957-02-11
•
Granted: 1960-05-24
•
Expires: 1977-02-11
Abstract
No abstract record available.
Inventors
- 👤 Ewald H Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:17
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B4/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US816090A
Cited
GB191424109A
Cited
US1518124A
Cited
US1637792A
Cited
US2810549A
Cited
US2837317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |