Patent US2804894A successfully refreshed from Google Patents.
US2804894A
Expired / Lapsed
US
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Screw driver
Assignee: Cornwall & Patterson Co
•
Filing: 1954-08-20
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Granted: 1957-09-03
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Expires: 1974-08-20
Abstract
No abstract record available.
Inventors
- 👤 William F Rosenburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:41
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/0007; B25B23/0035
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US52631A
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CH113786A
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US1787087A
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US1952395A
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US2218631A
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US2442717A
Cited
US2565948A
Cited
US2522217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |