Patent US2759705A successfully refreshed from Google Patents.
US2759705A
Expired / Lapsed
US
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Rock drills with inserted cutting edges
Assignee: Individual
•
Filing: 1952-04-28
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Granted: 1956-08-21
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Expires: 1972-04-28
Abstract
No abstract record available.
Inventors
- 👤 Bjorkman Gustaf Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:56
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/36; E21B10/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1169369A
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US740906A
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FR337785A
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US1035270A
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US1096134A
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US1277970A
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US1415619A
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GB397144A
Cited
US2310288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |