US2840049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid heating unit
Assignee: Babcock and Wilcox Co
•
Filing: 1954-05-20
•
Granted: 1958-06-24
•
Expires: 1974-05-20
Abstract
No abstract record available.
Inventors
- 👤 Durham Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:24
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/22; F22B21/00; F22B21/34; F22B21/341; F22B21/343; F22B21/345
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2672849A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |