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US2543201A
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Circular radiator air heating furnace with spiral air baffles
Assignee: FLORENCE ROSS RIFLEY
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Filing: 1948-04-12
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Granted: 1951-02-27
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Expires: 1968-04-12
Abstract
No abstract record available.
Inventors
- 👤 Rifley Florence Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:27
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/065; F24H9/00; F24H9/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US11278A
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US251320A
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US309495A
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US446222A
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US563240A
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US1606494A
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US1811182A
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 |