US2633335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drilling tool
Assignee: Ingersoll Rand Co
•
Filing: 1947-02-20
•
Granted: 1953-03-31
•
Expires: 1967-02-20
Abstract
No abstract record available.
Inventors
- 👤 Dudley W Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:06
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US874455A
Cited
GB190805778A
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US923514A
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US1114497A
Cited
US1204805A
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US2022194A
Cited
US2101376A
Cited
US2101864A
Cited
US2502128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |