US2760459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operating device for steel hatch-covers
Assignee: Individual
•
Filing: 1952-03-03
•
Granted: 1956-08-28
•
Expires: 1972-03-03
Abstract
No abstract record available.
Inventors
- 👤 Kummerman Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:44
CPC Classifications
B; B63; B63B; B63B19/00; B63B19/12; B63B19/14; B63B19/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR757801A
Cited
US781665A
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US967856A
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US1692782A
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US1735329A
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US1899062A
Cited
US1892340A
Cited
US2129973A
Cited
US2268192A
Cited
US2641214A
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 |