Patent US1569885A successfully refreshed from Google Patents.
Patent US2537984A successfully refreshed from Google Patents.
US2537984A
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Heat exchange apparatus
Assignee: Foster Wheeler Inc
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Filing: 1944-06-13
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Granted: 1951-01-16
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Expires: 1964-06-13
Abstract
No abstract record available.
Inventors
- 👤 Frisch Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:27
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/22; B21C37/24; F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US785081A
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FR607459A
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US1800448A
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US1827025A
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US1943557A
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US1956617A
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US2204332A
Cited
US2201024A
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US2307355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |