Patent US2758431A successfully refreshed from Google Patents.
US2758431A
Expired / Lapsed
US
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Knife sharpener attachment for mixer
Assignee: Hoover Co
•
Filing: 1954-10-13
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Granted: 1956-08-14
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Expires: 1974-10-13
Abstract
No abstract record available.
Inventors
- 👤 George E Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:55
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/36; B24B3/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US522373A
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US757843A
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US1184517A
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US1742707A
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US2141850A
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US2098098A
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US2104268A
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US2694275A
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US2684561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-14 | 1960-02-13 | 1960-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-14 | 1964-02-13 | 1964-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-14 | 1968-02-13 | 1968-08-14 | $7700.00 | Window Closed / Lapsed |