US2881720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclone furnaces
Assignee: Babcock and Wilcox Co
•
Filing: 1951-06-19
•
Granted: 1959-04-14
•
Expires: 1971-06-19
Abstract
No abstract record available.
Inventors
- 👤 Lotz Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:14
CPC Classifications
F; F23; F23C; F23C3/00; F23C3/006; F23C3/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1180792A
Cited
DE408850C
Cited
US1657725A
Cited
GB305270A
Cited
AU1627028A
Cited
US2357301A
Cited
US2395103A
Cited
US2468415A
Cited
US2527934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |