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US2573364A
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US
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Air-heating furnace with liquid heat transfer means
Assignee: Individual
•
Filing: 1949-02-04
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Granted: 1951-10-30
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Expires: 1969-02-04
Abstract
No abstract record available.
Inventors
- 👤 John E Scharff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:13
CPC Classifications
F; F24; F24H; F24H6/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US208822A
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DE401743C
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US1846292A
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US2225181A
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US2212222A
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US2190998A
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US2249554A
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US2269055A
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US2363742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |