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US2697998A
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Hatch structure and pivoted closure means therefor
Assignee: SEABOARD MACHINERY Corp
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Filing: 1951-07-23
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Granted: 1954-12-28
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Expires: 1971-07-23
Abstract
No abstract record available.
Inventors
- 👤 Karl W Jernstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:24
CPC Classifications
B; B63; B63B; B63B19/00; B63B19/12; B63B19/14; B63B19/19; B63B19/203
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL48744C
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US934456A
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US1627835A
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US1564104A
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DE530190C
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GB375120A
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GB463404A
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GB466019A
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FR912624A
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US2674967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |