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US2760223A
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Assignee: DURKEE ATWOOD CO
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Filing: 1954-06-22
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Granted: 1956-08-28
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Expires: 1974-06-22
Abstract
No abstract record available.
Inventors
- 👤 Carl F Walz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:27
CPC Classifications
E; E05; E05F; E05F5/00; E05F5/02; E05F5/022; E05F5/025; E05Y; E05Y2900/00; E05Y2900/50; E05Y2900/53; E05Y2900/531
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1385448A
Cited
US1422579A
Cited
US1556593A
Cited
US1972503A
Cited
US2146090A
Cited
US2585438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-28 | 1960-02-27 | 1960-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-28 | 1964-02-27 | 1964-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-28 | 1968-02-27 | 1968-08-28 | $7700.00 | Window Closed / Lapsed |