US2543033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil burning downdraft floor furnace
Assignee: Individual
•
Filing: 1944-06-12
•
Granted: 1951-02-27
•
Expires: 1964-06-12
Abstract
No abstract record available.
Inventors
- 👤 Harry C Little
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:54
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US676784A
Cited
US1403787A
Cited
US1561161A
Cited
US1527233A
Cited
US1755727A
Cited
US2136235A
Cited
US2259299A
Cited
US2302235A
Cited
US2401330A
Cited
US2418709A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |