US2896591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace wall for forced once-through boiler
Assignee: Combustion Engineering Inc
•
Filing: 1957-07-15
•
Granted: 1959-07-28
•
Expires: 1977-07-15
Abstract
No abstract record available.
Inventors
- 👤 Willburt W Schroedter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:28
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/10; F22B37/14; F22B37/146; F22B29/00; F22B29/06; F22B29/061; Y; Y10; Y10S; Y10S122/00; Y10S122/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1961233A
Cited
DE827384C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |