US3477411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat recovery boiler with bypass
Assignee: Aqua Chem Inc
•
Filing: 1967-12-22
•
Granted: 1969-11-11
•
Expires: 1987-12-22
Abstract
No abstract record available.
Inventors
- 👤 Frank Gething
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:33
CPC Classifications
F; F22; F22B; F22B9/00; F22B9/10; F22B9/12; F22B9/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1734310A
Cited
US1994026A
Cited
US2080404A
Cited
US2576053A
Cited
GB774799A
Cited
US3231016A
Cited
US3269360A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |