US2686499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel burning and fly ash collecting apparatus
Assignee: Babcock and Wilcox Co
•
Filing: 1947-10-08
•
Granted: 1954-08-17
•
Expires: 1967-10-08
Abstract
No abstract record available.
Inventors
- 👤 Sparks Cedric Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:14
CPC Classifications
F; F23; F23J; F23J3/00; F23J3/06; F23B; F23B5/00; F23B5/02
Claims Analysis
Total Claims: 0
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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) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |