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US2559616A
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Pressure-sealing apparatus for flight conveyers
Assignee: HANNAH JANE HAPMAN
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Filing: 1949-07-02
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Granted: 1951-07-10
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Expires: 1969-07-02
Abstract
No abstract record available.
Inventors
- 👤 Henry W Hapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:26
CPC Classifications
B; B65; B65G; B65G19/00; B65G19/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1317565A
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US1006260A
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US1048019A
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US1184151A
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US1235406A
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US1554275A
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US1630071A
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US2122399A
Cited
US2420217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |