US2446069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel burner
Assignee: Peabody Engineering Corp
•
Filing: 1944-10-31
•
Granted: 1948-07-27
•
Expires: 1964-10-31
Abstract
No abstract record available.
Inventors
- 👤 Robert C Vroom
- 👤 Dunn John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:35
CPC Classifications
F; F23; F23D; F23D1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1680964A
Cited
US1795454A
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US1843662A
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US1779647A
Cited
US1870013A
Cited
US1971328A
Cited
US1910893A
Cited
US2041535A
Cited
US2320575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-27 | 1952-01-26 | 1952-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-27 | 1956-01-26 | 1956-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-27 | 1960-01-26 | 1960-07-27 | $7700.00 | Window Closed / Lapsed |