US2804854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler having a vortex chamber and method of operating the boiler
Assignee: Babcock and Wilcox Co
•
Filing: 1953-03-02
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Granted: 1957-09-03
•
Expires: 1973-03-02
Abstract
No abstract record available.
Inventors
- 👤 Wootton William Robert
- 👤 Richard H Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:56
CPC Classifications
F; F23; F23C; F23C3/00; F23C3/006; F23C3/008; F22; F22B; F22B29/00; F22B29/02; F22G; F22G5/00; F22G5/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB523870A
Cited
US2357303A
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US2357302A
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GB587240A
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US2594312A
Cited
US2518800A
Cited
GB675410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |