Patent US4323492A successfully refreshed from Google Patents.
US2810994A
Expired / Lapsed
US
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Self adjusting knife sharpening head
Assignee: Cincinnati Butchers Supply Co
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Filing: 1955-05-13
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Granted: 1957-10-29
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Expires: 1975-05-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Carl Oscar Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:05
CPC Classifications
B; B24; B24D; B24D9/00; B24D9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US238284A
Cited
US282509A
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US868532A
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US1678596A
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US1839139A
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US1953181A
Cited
US1971653A
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US2020219A
Cited
US2142873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |