Patent US2553493A successfully refreshed from Google Patents.
US2553493A
Expired / Lapsed
US
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Fluid heat exchange installation
Assignee: Babcock and Wilcox Co
•
Filing: 1948-10-02
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Granted: 1951-05-15
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Expires: 1968-10-02
Abstract
No abstract record available.
Inventors
- 👤 Charles H Woolley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:26
CPC Classifications
F; F22; F22G; F22G5/00; F22G5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE454408C
Cited
FR702613A
Cited
US1959214A
Cited
US2217512A
Cited
US2242762A
Cited
US2427031A
Cited
US2268776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |