Patent US2757906A successfully refreshed from Google Patents.
US2757906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for drilling in rock or the like
Assignee: Atlas Copco AB
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Filing: 1950-04-21
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Granted: 1956-08-07
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Expires: 1970-04-21
Abstract
No abstract record available.
Inventors
- 👤 Ryd Sven Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:08
CPC Classifications
E; E21; E21B; E21B17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US371679A
Cited
US475647A
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US553307A
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US560500A
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DE635277C
Cited
US880881A
Cited
US1905497A
Cited
US2101376A
Cited
US2027063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-07 | 1960-02-06 | 1960-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-07 | 1964-02-06 | 1964-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-07 | 1968-02-06 | 1968-08-07 | $7700.00 | Window Closed / Lapsed |