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US2168522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mounting for rock drills
Assignee: Ingersoll Rand Co
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Filing: 1938-04-15
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Granted: 1939-08-08
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Expires: 1958-04-15
Abstract
No abstract record available.
Inventors
- 👤 Dudley W Hart
- 👤 Mason F Behney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:20
CPC Classifications
E; E21; E21B; E21B15/00; E21B15/006
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) | 1942-08-07 | 1943-02-06 | 1943-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-08-07 | 1947-02-06 | 1947-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-08-07 | 1951-02-06 | 1951-08-08 | $7700.00 | Window Closed / Lapsed |