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Patent US2919901A successfully refreshed from Google Patents.
US2919901A
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US
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Drill system with suction
Assignee: Thor Power Tool Co
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Filing: 1957-01-25
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Granted: 1960-01-05
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Expires: 1977-01-25
Abstract
No abstract record available.
Inventors
- 👤 Robert L Sandvig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:18
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US651487A
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US2101144A
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US2177391A
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US2310265A
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US2326383A
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US2643641A
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GB695009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |