Patent US2641445A successfully refreshed from Google Patents.
US2641445A
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Combined rotary and impact drill with fluid coupling
Assignee: SNYDER OIL TOOL Corp
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Filing: 1949-11-07
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Granted: 1953-06-09
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Expires: 1969-11-07
Abstract
No abstract record available.
Inventors
- 👤 Robert E Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:35
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B4/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1572972A
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US1739390A
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US1785086A
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FR671684A
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US2002629A
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FR780441A
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US2228482A
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US2167019A
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US2287157A
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US2425012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |