Patent US2646091A successfully refreshed from Google Patents.
US2646091A
Expired / Lapsed
US
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Power screw driver
Assignee: Illinois Tool Works Inc
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Filing: 1948-12-14
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Granted: 1953-07-21
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Expires: 1968-12-14
Abstract
No abstract record available.
Inventors
- 👤 Leonard E Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:42
CPC Classifications
B; B23; B23P; B23P19/00; B23P19/001; B23P19/04; B23P19/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1638261A
Cited
US1813697A
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US2260055A
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US2314760A
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US2328383A
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US2373992A
Cited
US2554732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |