US2468415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for burning coal
Assignee: Individual
•
Filing: 1945-08-17
•
Granted: 1949-04-26
•
Expires: 1965-08-17
Abstract
No abstract record available.
Inventors
- 👤 Daniel E Stair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:38
CPC Classifications
F; F23; F23B; F23B80/00; F23B40/00; F23B90/00; F23B90/04; F23B2700/00; F23B2700/009
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) | 1952-04-25 | 1952-10-25 | 1953-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-25 | 1956-10-25 | 1957-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-25 | 1960-10-25 | 1961-04-26 | $7700.00 | Window Closed / Lapsed |