Patent US2658503A successfully refreshed from Google Patents.
US2658503A
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US
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Air heating furnace for above and below floor mounting
Assignee: Individual
•
Filing: 1949-09-21
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Granted: 1953-11-10
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Expires: 1969-09-21
Abstract
No abstract record available.
Inventors
- 👤 Paul P Scheurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:08
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1169448A
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US1074194A
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US1589865A
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US1660690A
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US2020862A
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US2285108A
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US2318393A
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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) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |